Warning Signs

Construction Warning Signs alert workers, contractors, visitors and members of the public to potential hazards commonly found on building sites and temporary work areas. Also known as site warning signs, hazard warning signs or construction hazard signs, they play a vital role in reducing risk and improving site safety.

Widely used by contractors, developers, principal contractors, local authorities and facilities managers, these signs help identify dangers such as moving vehicles, excavations, overhead work, hazardous substances and restricted access areas.

Typical installation locations include site entrances, perimeter fencing, hoardings, access routes, excavation zones, loading areas, scaffolding locations and high-risk work areas.

Manufactured in the UK and available in durable materials suitable for indoor and outdoor use, construction warning signs provide clear visual communication to help maintain safe and compliant construction environments.

 Show Moreexpand_more
 Show Lessexpand_less
Warning Construction Site Keep Out Sign with yellow warning and blue keep out symbols
Warning Construction Site Keep Out Sign - BS 5499 Compliant

Clearly warns people to keep out of construction areas, helping prevent unauthorised access and improve site safety.
• Warns people of a construction site and instructs them to keep out
• Suitable for construction sites, renovation projects, perimeter fencing and work areas
• High-contrast colours, bold text and clear symbols provide quick recognition
• Available in Rigid Plastic (1mm), Rigid Plastic 1mm (Self Adhesive Back), Rigid Plastic (2mm), Rigid Plastic 2mm (Self Adhesive Back), Self Adhesive Vinyl and 4mm Recyclable Correx ®
• Helps reinforce restricted access controls and reduce entry into hazardous work areas
£5.72
Details View details  
Warning Construction Site Keep Out signs pack of 10 with warning and mandatory safety symbols
Warning Construction Site Keep Out Signs - Pack of 10
Clearly warn unauthorised persons to keep out of active construction areas with this Warning Construction Site Keep Out Signs - Pack of 10.
• Warns of construction site hazards and restricts unauthorised access
• Ideal for construction sites, building projects, roadworks and work zones
• High-visibility warning and mandatory symbols provide excellent recognition
• Available in Rigid Plastic (1mm) and Recyclable Correx ® (4mm)
• Supplied as a pack of 10 for consistent site safety and perimeter control
£161.18
Details View details  
Danger Keep Out safety sign with warning and mandatory symbols
Danger Keep Out Sign
Warn individuals to stay out of hazardous or restricted areas with this Danger Keep Out Sign.
• Clearly communicates danger and restricted access requirements
• Ideal for construction sites, industrial areas and restricted zones
• Bold colours and recognised safety symbols provide excellent visibility and instant recognition
• Available in Rigid Plastic (1mm), Rigid Plastic (2mm) and Self Adhesive Vinyl
• Helps maintain workplace safety, security and prevent unauthorised access
£5.95
Details View details  
Danger High Voltage Electrical warning safety sign with electrical hazard symbol
Danger High Voltage Electrical Sign
Warn individuals of dangerous high voltage electrical hazards with this Danger High Voltage Electrical Sign.
• Alerts people to the presence of high voltage electrical hazards
• Suitable for electrical rooms, substations, switch rooms and industrial environments
• High-contrast yellow and black design ensures clear visibility and instant recognition
• Available in Rigid Plastic (1mm), Rigid Plastic 1mm (Self Adhesive Back), Rigid Plastic (2mm), Rigid Plastic 2mm (Self Adhesive Back), and Self Adhesive Vinyl
• Helps reduce the risk of electric shock and improve workplace safety compliance
£2.26
Details View details  
Warning Beware Of Moving Vehicles safety sign for industrial and warehouse traffic areas
Warning Beware Of Moving Vehicles Sign
Warning Beware Of Moving Vehicles Sign alerts pedestrians and workers to the presence of moving vehicles in busy industrial and workplace environments.
• Warns individuals about moving vehicles and traffic hazards
• Ideal for warehouses, loading bays, construction sites, and industrial areas
• High-visibility yellow and black warning design ensures clear recognition
• Available in durable Rigid Plastic (1mm) and Self Adhesive Vinyl
• Helps improve site safety and reduce the risk of vehicle-related accidents
£5.72
Details View details  
Danger Confined Space No Unauthorised Entry Permit To Work Must Be Obtained safety sign
Danger Confined Space No Unauthorised Entry Permit To Work Must Be Obtained Sign
Warn personnel of confined space hazards and restrict access with this Danger Confined Space No Unauthorised Entry Permit To Work Must Be Obtained Sign.
• Warns of confined space dangers, prohibits unauthorised entry and requires a permit to work before access
• Suitable for industrial sites, construction areas, plant rooms and restricted access zones
• High-contrast warning, prohibition and mandatory symbols provide excellent visibility and quick recognition
• Available in Rigid Plastic (1mm), Rigid Plastic 1mm (Self Adhesive Back), Rigid Plastic (2mm), Rigid Plastic 2mm (Self Adhesive Back), and Self Adhesive Vinyl
• Helps support safe access procedures and improve compliance with confined space safety requirements
£5.72
Details View details  
Danger keep out sign with hazard warning and restricted access symbols
Danger Keep Out Sign
Danger keep out sign designed to warn individuals of hazardous areas and prevent unauthorised access to restricted locations.
• Helps communicate dangerous conditions and instructs individuals to keep out of restricted areas
• Suitable for construction sites, industrial facilities, secure zones, and hazardous work environments
• Bold warning colours and clear symbols ensure strong visibility and quick understanding
• Manufactured from Rigid Plastic (1mm), Rigid Plastic (2mm), Self Adhesive Vinyl, and Recyclable Correx ® (4mm)
• Supports improved site safety awareness and helps reduce the risk of unauthorised entry
£8.50
Details View details  
Tree protection area keep out sign with environmental restriction instructions
Tree Protection Area Keep Out Sign
Indicates a protected tree area and instructs individuals to keep out to prevent damage and ensure legal compliance
• Clearly marks protected tree zones and restricts access
• Ideal for construction sites, development projects, and protected land areas
• High-visibility yellow background with clear black text for easy reading
• Available in Rigid Plastic (1mm), Rigid Plastic (2mm), and Recyclable Correx ® (4mm)
• Helps enforce environmental protection rules and planning regulations
£8.50
Details View details  
Warning deep excavations safety sign with hazard symbol
Warning Deep Excavations Sign
Warns of deep excavation hazards to prevent accidents and ensure site safety
• Alerts workers and visitors to the presence of deep excavation risks
• Ideal for construction sites, civil engineering projects, and groundwork areas
• Bold black text on yellow background ensures high visibility
• Available in Rigid Plastic (1mm) and Self Adhesive Vinyl
• Helps reduce risk of falls and supports safer working environments
£4.07
Details View details  
Danger High Voltage Cables Underground Electrical warning safety sign with electrical hazard symbol
Danger High Voltage Cables Underground Electrical Sign
Warn individuals of buried high voltage electrical cables with this Danger High Voltage Cables Underground Electrical Sign.
• Alerts individuals to underground high voltage cable hazards
• Ideal for construction sites, excavation areas and utility zones
• High-contrast yellow and black design ensures clear visibility and instant recognition
• Available in Rigid Plastic (1mm), Rigid Plastic 1mm (Self Adhesive Back), Rigid Plastic (2mm), Rigid Plastic 2mm (Self Adhesive Back), and Self Adhesive Vinyl
• Helps reduce the risk of serious injury, electrical accidents and excavation damage
£2.26
Details View details  
Danger Fragile Roof warning safety sign with fragile roof hazard symbol
Danger Fragile Roof Sign
Warn personnel of roofing hazards with this Danger Fragile Roof Sign.
• Warns of fragile roof hazards to help prevent falls and serious injury
• Ideal for construction sites, industrial buildings, maintenance areas and roof access points
• High-visibility yellow and black design ensures clear recognition and readability
• Available in Rigid Plastic (1mm), Rigid Plastic 1mm (Self Adhesive Back), Rigid Plastic (2mm), Rigid Plastic 2mm (Self Adhesive Back), and Self Adhesive Vinyl
• Helps improve safety awareness and restrict access to hazardous roof areas
£4.07
Details View details  
Danger Drop Below warning safety sign with fall hazard symbol
Danger Drop Below Warning Sign
Warn individuals of dangerous drop hazards with this Danger Drop Below Warning Sign.
• Alerts individuals to the risk of a drop below and potential fall hazards
• Suitable for construction sites, warehouses, elevated walkways, platforms and hazardous edges
• High-visibility yellow and black design provides excellent recognition and readability
• Available in Rigid Plastic (1mm), Rigid Plastic 1mm (Self Adhesive Back), Rigid Plastic (2mm), Rigid Plastic 2mm (Self Adhesive Back), and Self Adhesive Vinyl
• Helps improve awareness around exposed edges and reduce the risk of falls
£2.26
Details View details  
Danger Fragile Roof Site warning safety sign with fragile roof hazard symbol
Danger Fragile Roof Site Sign
Warn personnel of roofing hazards with this Danger Fragile Roof Site Sign.
• Warns of fragile roof hazards to help prevent falls through roof surfaces
• Ideal for construction sites, industrial buildings, maintenance areas and roof access points
• High-visibility yellow and black design ensures excellent recognition from a distance
• Available in Rigid Plastic (1mm)
• Helps improve roof safety awareness and reduce the risk of serious injury
£8.19
Details View details  
Danger Asbestos Keep Out landscape safety sign with warning and mandatory symbols
Danger Asbestos Keep Out Sign - Landscape
Warn individuals to keep out of hazardous asbestos areas with this Danger Asbestos Keep Out Sign - Landscape.
• Clearly instructs people to keep out of asbestos hazard zones
• Ideal for construction sites, demolition areas and restricted workplaces
• Bold colours and recognised safety symbols provide excellent visibility and instant recognition
• Available in Rigid Plastic (1mm) and Rigid Plastic (2mm)
• Helps reduce the risk of exposure to hazardous asbestos fibres and prevents unauthorised access
£2.63
Details View details  
Danger Heavy Plant Crossing warning safety sign for heavy plant vehicle crossing areas.
Danger Heavy Plant Crossing Sign

Warn pedestrians and drivers of heavy plant crossing areas to improve safety and reduce the risk of accidents.
• Warns of heavy plant crossing hazards
• Ideal for construction sites, industrial yards, warehouses, logistics centres and access roads
• High-visibility yellow background with bold black text and warning symbol
• Available in Aluminium Composite (3mm), Aluminium Composite With Fixing Channel (3mm), Rigid Plastic (1mm), Rigid Plastic (2mm), Self Adhesive Vinyl and Recyclable Correx ® (4mm)
• Helps improve site awareness and supports safer vehicle and pedestrian movement
£12.31
Details View details  
Warning Lorries Turning safety sign with yellow warning symbol
Warning Lorries Turning Sign
Warn pedestrians and drivers of turning vehicle hazards with this Warning Lorries Turning Sign.
• Alerts individuals to lorries turning and moving vehicle hazards
• Ideal for construction sites, industrial estates and delivery areas
• High-visibility yellow and black design provides clear recognition from a distance
• Available in Rigid Plastic (1mm), Rigid Plastic (2mm), Self Adhesive Vinyl, and Recyclable Correx ® (4mm)
• Helps reduce the risk of collisions between pedestrians and turning vehicles
£9.01
Details View details  
Warning Men Working Overhead safety warning sign
Warning Men Working Overhead Sign

Warn individuals of overhead work hazards with this highly visible warning safety sign designed to improve workplace safety awareness.
• Alerts people to overhead work hazards
• Suitable for construction sites, warehouses, and industrial areas
• High-visibility yellow background with bold black text and symbol
• Available in Rigid Plastic (1mm), Rigid Plastic (2mm), and Self Adhesive Vinyl
• Helps maintain safety awareness in active work zones
£6.75
Details View details  
Warning Site Entrance safety sign with yellow warning symbol
Warning Site Entrance Sign

Warn individuals of potential hazards when entering a site with this Warning Site Entrance Sign.
• Alerts people to hazards at site entry points
• Ideal for construction sites, industrial areas and work zones
• High-visibility yellow and black design ensures clear recognition and readability
• Available in Rigid Plastic (1mm), Rigid Plastic (2mm) and Self Adhesive Vinyl
• Helps improve site safety awareness and supports compliance with workplace safety requirements
£6.75
Details View details  
Danger Demolition In Progress warning safety sign with yellow and black hazard symbol
Danger Demolition In Progress Sign
Warn personnel and visitors of active demolition work with this Danger Demolition In Progress Sign.
• Warns that demolition work is currently in progress to help prevent unauthorised access
• Ideal for construction sites, demolition projects, refurbishment works and restricted access areas
• High-visibility yellow and black design ensures clear recognition and readability
• Available in Rigid Plastic (1mm), Rigid Plastic 1mm (Self Adhesive Back), Rigid Plastic (2mm), Rigid Plastic 2mm (Self Adhesive Back), and Self Adhesive Vinyl
• Helps improve site safety by clearly identifying hazardous demolition zones
£4.07
Details View details  
Warning Deep Water safety sign with deep water hazard symbol
Warning Deep Water Sign
Warn individuals of deep water hazards with this Warning Deep Water Sign.
• Alerts people to the presence of deep water and potential drowning hazards
• Ideal for lakes, rivers, docks and waterside locations
• High-visibility yellow and black design ensures clear recognition and readability
• Available in Rigid Plastic (1mm), Rigid Plastic (2mm), Self Adhesive Vinyl, and Recyclable Correx ® (4mm)
• Helps improve safety awareness and reduce the risk of accidents around deep water
£9.01
Details View details  
Caution wet paint safety sign with paintbrush symbol
Caution Wet Paint Sign
Warns individuals of freshly painted surfaces to prevent contact and potential damage
• Alerts people to avoid contact with wet paint surfaces
• Ideal for maintenance areas, public spaces, and construction sites
• Bright yellow background with clear text ensures high visibility
• Available in Rigid Plastic (1mm) and Self Adhesive Vinyl
• Helps prevent smudging, damage, and accidental contact
£2.26
Details View details  
Warning Falling Objects safety warning sign
Warning Falling Objects Sign

Warn individuals of potential overhead falling object hazards with this highly visible warning safety sign.
• Alerts people to falling object dangers from above
• Suitable for construction sites, warehouses, and industrial areas
• High-visibility yellow and black design ensures clear recognition
• Available in Rigid Plastic (1mm), Rigid Plastic (2mm), Self Adhesive Vinyl, and Recyclable Correx ® (4mm)
• Helps maintain workplace safety and hazard awareness
£9.01
Details View details  
Danger Asbestos warning safety sign with yellow hazard symbol
Danger Asbestos Sign
Warn workers and visitors of hazardous asbestos materials with this Danger Asbestos Sign.
• Highlights the presence of dangerous asbestos materials
• Ideal for construction sites, demolition areas and older buildings
• Bold black text on a high-visibility yellow background ensures clear recognition
• Available in Rigid Plastic (1mm), Rigid Plastic 1mm (Self Adhesive Back), Rigid Plastic (2mm), Rigid Plastic 2mm (Self Adhesive Back), and Self Adhesive Vinyl
• Helps reduce health risks by clearly communicating asbestos hazards
£2.26
Details View details  
Danger deep excavations safety sign with warning symbol
Danger Deep Excavations Sign
Warns of dangerous deep excavation areas to prevent accidents and ensure site safety
• Alerts workers and visitors to serious deep excavation hazards
• Ideal for construction sites, civil engineering works, and excavation zones
• Bold black text on yellow background ensures maximum visibility
• Available in Rigid Plastic (1mm) and Rigid Plastic (2mm)
• Helps reduce risk of falls and supports safer working conditions
£8.19
Details View details  
Danger Buried Cables Electrical warning safety sign with electrical hazard symbol
Danger Buried Cables Electrical Sign
Warn workers of buried electrical cable hazards with this Danger Buried Cables Electrical Sign.
• Alerts workers to the presence of underground electrical cables
• Ideal for construction sites, excavation zones and utility areas
• High-contrast yellow and black design ensures clear visibility and instant recognition
• Available in Rigid Plastic (1mm), Rigid Plastic 1mm (Self Adhesive Back), Rigid Plastic (2mm), Rigid Plastic 2mm (Self Adhesive Back), and Self Adhesive Vinyl
• Helps reduce the risk of cable strikes, electrical accidents and excavation damage
£2.26
Details View details  
Danger Asbestos Warning safety sign with yellow hazard symbol
Danger Asbestos Warning Sign
Warn individuals of hazardous asbestos materials with this Danger Asbestos Warning Sign.
• Clearly alerts people to the presence of dangerous asbestos hazards
• Ideal for construction sites, demolition areas and industrial premises
• High-contrast yellow and black design provides excellent visibility and instant recognition
• Available in Rigid Plastic (1mm), Rigid Plastic (2mm) and Self Adhesive Vinyl
• Helps reduce the risk of accidental asbestos exposure and supports workplace safety
£1.52
Details View details  
Warning Pedestrians Crossing safety sign with pedestrian symbol on yellow warning background
Warning Pedestrians Crossing Sign

Clearly warns drivers and personnel of pedestrian crossing activity to improve safety in shared areas.
• Warns of pedestrian crossing hazards and moving foot traffic
• Ideal for construction sites, warehouses, car parks, and roadways
• High-visibility yellow and black design ensures clear recognition
• Available in Rigid Plastic (1mm), Rigid Plastic (2mm), Self Adhesive Vinyl and Recyclable Correx ® (4mm)
• Helps reduce accidents by encouraging awareness around pedestrian routes
£8.50
Details View details  
Caution Change In Floor Level warning safety sign with yellow hazard symbol
Caution Change In Floor Level Warning Sign
Warn people of uneven or changing floor levels with this Caution Change In Floor Level Warning Sign.
• Alerts individuals to uneven or changing floor levels to help prevent trips and falls
• Suitable for workplaces, warehouses, offices, entrances and public buildings
• High-visibility yellow and black design ensures clear recognition and readability
• Available in Rigid Plastic (1mm), Rigid Plastic 1mm (Self Adhesive Back), Rigid Plastic (2mm), Rigid Plastic 2mm (Self Adhesive Back), and Self Adhesive Vinyl
• Helps reduce trip hazards and improve overall workplace safety
£2.26
Details View details  
Danger Demolition In Progress warning safety sign with yellow hazard symbol
Danger Demolition in Progress Sign
Warn people that demolition work is taking place with this Danger Demolition In Progress Sign.
• Alerts workers, visitors and the public to demolition activity
• Suitable for construction sites, demolition zones and restricted work areas
• Bold warning symbol and clear text provide excellent visibility and recognition
• Available in Rigid Plastic (1mm) and Rigid Plastic (2mm)
• Helps reduce risk by clearly identifying hazardous demolition areas
£8.19
Details View details  
Warning Construction Activities In Progress safety sign
Warning Construction Activities In Progress Sign

Alerts people to active construction work and helps reduce the risk of accidents in busy work areas.
• Warns staff, visitors and contractors that construction activities are taking place
• Suitable for construction sites, industrial facilities, workplaces and maintenance areas
• Bold yellow warning design with clear black text for strong visibility
• Available in Rigid Plastic (1mm), Rigid Plastic (2mm), Self Adhesive Vinyl and Recyclable Correx ® (4mm)
• Helps promote awareness and safer movement around active work zones
£9.01
Details View details  
Warning Site Entrance safety sign with yellow warning symbol
Warning Site Entrance Sign
Warn drivers and pedestrians of site entrance hazards with this Warning Site Entrance Sign.
• Clearly alerts drivers and pedestrians to hazards at site entrance points
• Ideal for construction sites, building developments and work zones
• High-contrast yellow and black design provides excellent visibility and instant recognition
• Available in Rigid Plastic (1mm), Rigid Plastic (2mm) and Self Adhesive Vinyl
• Helps reduce accidents by improving awareness at site entry points
£5.95
Details View details  
Danger Asbestos No Admittance Protective Clothing safety sign with warning, prohibition and mandatory symbols
Danger Asbestos No Admittance Protective Clothing Sign
Warn personnel of asbestos hazards and enforce controlled access with this Danger Asbestos No Admittance Protective Clothing Sign.
• Warns of asbestos hazards, restricts access to authorised personnel and requires protective clothing before entry
• Ideal for asbestos-contaminated areas, construction sites and plant rooms
• Bold colours and recognised safety symbols provide excellent visibility and quick understanding
• Available in Rigid Plastic (1mm), Rigid Plastic 1mm (Self Adhesive Back), Rigid Plastic (2mm), Rigid Plastic 2mm (Self Adhesive Back), and Self Adhesive Vinyl
• Helps enforce site safety procedures and reduce the risk of exposure to hazardous asbestos materials
£5.72
Details View details  
Danger Asbestos Keep Out safety sign with warning and mandatory symbols
Danger Asbestos Keep Out Sign
Warn individuals to keep away from hazardous asbestos areas with this Danger Asbestos Keep Out Sign.
• Clearly communicates asbestos hazards and instructs people to keep out of restricted areas
• Ideal for construction sites, demolition areas and industrial workplaces
• High-contrast colours and recognised safety symbols provide excellent visibility and readability
• Available in Rigid Plastic (1mm), Rigid Plastic 1mm (Self Adhesive Back), Rigid Plastic (2mm), Rigid Plastic 2mm (Self Adhesive Back), and Self Adhesive Vinyl
• Helps reduce the risk of asbestos exposure and supports effective site access control
£5.72
Details View details  
Warning Concealed Entrance safety sign with yellow warning symbol
Warning Concealed Entrance Sign

Warn people of hidden or concealed entrances with this Warning Concealed Entrance Sign.
• Alerts people to concealed entrance hazards that may not be immediately visible
• Suitable for construction sites, industrial areas and restricted access points
• Bold yellow and black design ensures maximum visibility and clarity
• Available in Rigid Plastic (1mm), Rigid Plastic (2mm), Self Adhesive Vinyl, and Recyclable Correx ® (4mm)
• Helps improve awareness of hidden entrances and reduce the risk of accidents
£9.01
Details View details  
Warning Construction Site Keep Out safety sign with warning and mandatory symbols
Warning Construction Site Keep Out Sign
Warn of construction site hazards and prevent unauthorised access with this Warning Construction Site Keep Out Sign.
• Clearly communicates restricted access and instructs unauthorised persons to keep out
• Ideal for building sites, development zones and hazardous work areas
• High-visibility yellow, black and blue design ensures clear recognition and readability
• Available in Rigid Plastic (1mm) and Rigid Plastic (2mm)
• Helps prevent unauthorised entry and improves overall site safety
£8.19
Details View details  
Danger Scaffolding Incomplete warning safety sign with scaffolding hazard symbol
Danger Scaffolding Incomplete Sign
Warn people of incomplete scaffolding and potential fall hazards with this Danger Scaffolding Incomplete Sign.
• Clearly alerts workers and visitors to unsafe incomplete scaffolding
• Suitable for construction sites, maintenance areas and building works
• High-visibility yellow and black design ensures instant recognition and readability
• Available in Rigid Plastic (1mm) and Rigid Plastic (2mm)
• Helps prevent accidents by restricting access to unsafe scaffolding structures
£8.19
Details View details  
Danger Deep Water warning safety sign with deep water hazard symbol
Danger Deep Water Sign
Warn individuals of deep water hazards with this Danger Deep Water Sign.
• Alerts people to the presence of deep water and potential drowning hazards
• Suitable for construction sites, docks, waterways and industrial areas
• High-contrast yellow and black design ensures excellent visibility and quick recognition
• Available in Rigid Plastic (1mm) and Rigid Plastic (2mm)
• Helps reduce the risk of accidents and improve safety awareness around deep water
£8.19
Details View details  
Danger High Voltage Cables Underground warning safety sign with electrical hazard symbol
Danger High Voltage Cables Underground Sign
Warn workers and the public of buried high voltage electrical cables with this Danger High Voltage Cables Underground Sign.
• Clearly warns of underground high voltage cable hazards to help prevent accidental contact
• Ideal for construction sites, excavation areas and industrial zones
• High-contrast yellow and black design ensures maximum visibility and instant recognition
• Available in Rigid Plastic (1mm), Rigid Plastic (2mm) and Self Adhesive Vinyl
• Helps reduce the risk of electrical accidents and supports safer excavation practices
£5.95
Details View details  
Danger Asbestos Dust warning safety sign with yellow hazard symbol
Danger Asbestos Dust Sign
Warn workers and visitors of hazardous asbestos dust with this Danger Asbestos Dust Sign.
• Clearly communicates the danger of asbestos dust exposure
• Suitable for construction sites, demolition areas and industrial workplaces
• High-contrast yellow and black design ensures maximum visibility and instant recognition
• Available in Rigid Plastic (1mm), Rigid Plastic 1mm (Self Adhesive Back), Rigid Plastic (2mm), Rigid Plastic 2mm (Self Adhesive Back), and Self Adhesive Vinyl
• Helps reduce the risk of respiratory harm by alerting workers and visitors to asbestos dust hazards
£2.26
Details View details  
Danger Asbestos Removal warning safety sign with yellow hazard symbol
Danger Asbestos Removal Sign
Warn workers and visitors of hazardous asbestos removal activities with this Danger Asbestos Removal Sign.
• Clearly communicates the presence of asbestos removal hazards
• Suitable for construction sites, demolition areas and industrial workplaces
• High-contrast yellow and black design ensures excellent visibility and readability
• Available in Rigid Plastic (1mm), Rigid Plastic 1mm (Self Adhesive Back), Rigid Plastic (2mm), Rigid Plastic 2mm (Self Adhesive Back), and Self Adhesive Vinyl
• Helps reduce the risk of exposure and improves on-site safety awareness
£2.26
Details View details  
Danger Asbestos Removal landscape safety sign with warning hazard symbol
Danger Asbestos Removal Sign - Landscape
Warn staff, contractors and visitors of hazardous asbestos removal work with this highly visible danger safety sign.
• Clearly alerts people to dangerous asbestos removal activity
• Ideal for construction sites, demolition areas and refurbishment projects
• High-visibility yellow and black design for clear recognition
• Available in Rigid Plastic (1mm), Rigid Plastic (2mm) and Self Adhesive Vinyl
• Helps reduce health risks by improving awareness of asbestos removal operations
£6.13
Details View details  
Danger Asbestos Keep Out safety sign with warning and mandatory symbols
Danger Asbestos Keep Out Sign
Warn staff, contractors and visitors of asbestos hazards and restrict access with this highly visible danger and mandatory safety sign.
• Clearly warns of asbestos hazards and restricted access requirements
• Ideal for construction sites, demolition areas and hazardous zones
• High-visibility yellow, black and blue design for clear recognition
• Available in Rigid Plastic (1mm), Rigid Plastic 1mm (Self Adhesive Back), Rigid Plastic (2mm), Rigid Plastic 2mm (Self Adhesive Back), Self Adhesive Vinyl and Recyclable Correx® (4mm)
• Helps prevent exposure to hazardous asbestos fibres and improves site safety compliance
£5.72
Details View details  
Danger Asbestos Being Removed No Unauthorised Persons Beyond This Point safety sign with warning and prohibition symbols
Danger Asbestos Being Removed No Persons Sign
Warn staff, contractors and visitors that asbestos removal is in progress and prohibit unauthorised access with this highly visible safety sign.
• Prevents entry into hazardous asbestos removal zones
• Ideal for construction sites, demolition areas and restricted workspaces
• High-visibility yellow, black and red design for clear recognition
• Available in Rigid Plastic (1mm), Rigid Plastic 1mm (Self Adhesive Back), Rigid Plastic (2mm), Rigid Plastic 2mm (Self Adhesive Back), Self Adhesive Vinyl and Recyclable Correx ® (4mm)
• Helps reduce exposure risks and maintain site safety compliance
£5.72
Details View details  
Danger Asbestos Zone Respirator Must Be Worn safety sign with warning and mandatory PPE symbols
Danger Asbestos Zone Respirator Must Be Worn Sign
Ensure mandatory respiratory protection in hazardous asbestos areas with this highly visible danger and mandatory safety sign.
• Instructs personnel to wear respirators in asbestos zones
• Ideal for construction sites, demolition areas and contaminated environments
• High-visibility yellow, black and blue design for clear recognition
• Available in Rigid Plastic (1mm), Rigid Plastic 1mm (Self Adhesive Back), Rigid Plastic (2mm), Rigid Plastic 2mm (Self Adhesive Back) and Self Adhesive Vinyl
• Helps maintain safety compliance and reduce exposure to hazardous asbestos fibres
£5.72
Details View details  
Danger Asbestos Dust landscape safety sign with warning symbol
Danger Asbestos Dust Sign - Landscape
Warn staff, contractors and visitors of hazardous asbestos dust with this highly visible danger safety sign.
• Clearly alerts people to dangerous airborne asbestos dust
• Ideal for construction sites, demolition areas and industrial workplaces
• High-visibility yellow and black design for clear recognition
• Available in Rigid Plastic (1mm), Rigid Plastic (2mm) and Self Adhesive Vinyl
• Helps minimise health risks by reinforcing awareness of asbestos dust hazards
£1.52
Details View details  
Danger Overhead Live Wires electrical warning sign with electrical hazard symbol
Danger Overhead Live Wires Electrical Sign
Warn staff, contractors and visitors of hazardous overhead live electrical wires with this highly visible danger safety sign.
• Alerts people to the presence of overhead live electrical hazards
• Suitable for construction sites, industrial areas and outdoor work zones
• High-visibility yellow and black design for clear recognition
• Available in Rigid Plastic (1mm), Rigid Plastic 1mm (Self Adhesive Back), Rigid Plastic (2mm), Rigid Plastic 2mm (Self Adhesive Back) and Self Adhesive Vinyl
• Helps reduce the risk of accidental contact with live electrical wires
£5.72
Details View details  
Warning Men Working Below Sign with yellow hazard symbol
Warning Men Working Below Sign

Alerts workers and visitors to personnel working below ground level or in excavated areas.
• Warns of people working below to help prevent accidents
• Suitable for excavations, basements, construction sites, access routes and work zones
• Bold yellow warning design with clear black text and hazard symbol
• Available in Rigid Plastic (1mm), Rigid Plastic (2mm), Self Adhesive Vinyl and Recyclable Correx ® (4mm)
• Helps improve awareness around below-ground work areas
£9.01
Details View details  
Warning Men At Work safety sign with warning hazard symbol
Warning Men At Work Sign
Warn staff, visitors and the public of active work areas with this highly visible warning safety sign.
• Indicates active work zones to improve safety awareness
• Ideal for construction sites, industrial areas and maintenance zones
• High-visibility yellow and black design for clear recognition
• Available in Rigid Plastic (1mm), Rigid Plastic (2mm) and Self Adhesive Vinyl
• Helps reduce accidents by warning people of ongoing work activities
£6.75
Details View details  
Warning Site Traffic safety sign with warning hazard symbol
Warning Site Traffic Sign
Warn staff, visitors and drivers of moving site traffic with this highly visible warning safety sign.
• Alerts people to the presence of moving site traffic
• Suitable for construction sites, industrial yards and loading areas
• High-visibility yellow and black design for clear recognition
• Available in Rigid Plastic (1mm), Rigid Plastic (2mm), Self Adhesive Vinyl and Recyclable Correx ® (4mm)
• Helps reduce accidents by increasing awareness of vehicle movement
£9.01
Details View details  
Warning To Public safety sign for private property and construction site entrances
Warning To Public Sign

Warn the public that a site is private property and unauthorised access is prohibited with this highly visible warning sign.
• Prevents unauthorised entry and trespassing
• Ideal for building sites, construction areas and private land
• High-visibility yellow and black design for clear recognition
• Available in Rigid Plastic (1mm), Rigid Plastic (2mm), Self Adhesive Vinyl and Recyclable Correx ® (4mm)
• Helps reduce liability and reinforces site safety rules
£9.01
Details View details  
Danger Scaffolding Incomplete warning safety sign with scaffolding hazard symbol
Danger Scaffolding Incomplete Sign
Warn people of incomplete scaffolding and potential fall hazards with this Danger Scaffolding Incomplete Sign.
• Clearly alerts workers and visitors to unsafe incomplete scaffolding
• Suitable for construction sites, maintenance areas and building works
• High-visibility yellow and black design ensures instant recognition and readability
• Available in Rigid Plastic (1mm), Rigid Plastic (2mm) and Self Adhesive Vinyl
• Helps prevent accidents by restricting access to unsafe scaffolding structures
£5.72
Details View details  
Danger Asbestos Permit To Work Must Be Obtained safety sign with warning and mandatory symbols
Danger Asbestos Permit To Work Must Be Obtained Sign
Ensure permit to work procedures are followed in asbestos hazard areas with this highly visible danger and mandatory safety sign.
• Warns individuals of asbestos hazards and requires a permit to work before access
• Suitable for construction sites, refurbishment areas, restricted zones and hazardous work environments
• High-visibility yellow, black and blue design for clear recognition
• Available in Rigid Plastic (1mm), Rigid Plastic 1mm (Self Adhesive Back), Rigid Plastic (2mm), Rigid Plastic 2mm (Self Adhesive Back) and Self Adhesive Vinyl
• Helps control access to asbestos hazard areas and supports safe working procedures
£5.72
Details View details  
Danger construction site keep out no trespassing sign with warning and prohibition symbols
Danger Construction Site Keep Out / No Trespassing Sign
Danger construction site keep out no trespassing sign designed to warn of hazardous construction areas and prevent unauthorised access.
• Helps warn individuals of dangerous construction site hazards and prohibits trespassing in restricted areas
• Suitable for building sites, development zones, restricted work areas, and industrial premises
• High-contrast warning colours and bold symbols ensure strong visibility and quick recognition
• Manufactured from Rigid Plastic (1mm), Rigid Plastic (2mm), and Recyclable Correx ® (4mm)
• Supports site security and helps reduce the risk of accidents, liability, and unauthorised entry
£10.76
Details View details  
Caution Guard Dogs warning sign
Caution Guard Dogs Sign
Warn visitors and intruders of guard dogs on the premises with this Caution Guard Dogs Sign.
• Helps alert people that guard dogs are present on site
• Suitable for gates, fences, entrances, yards, and business premises
• High-visibility yellow and black design ensures clear recognition and readability
• Available in Rigid Plastic (1mm), Rigid Plastic (2mm), Self Adhesive Vinyl and Recyclable Correx ® (4mm)
• Supports improved site security and visitor awareness
£9.01
Details View details  
Caution Trip Hazard safety sign with trip hazard warning symbol
Caution Trip Hazard Sign
Warn people of potential trip hazards and uneven surfaces with this highly visible caution safety sign.
• Highlights trip hazards and uneven surfaces
• Suitable for workplaces, construction sites and public areas
• High-visibility yellow and black design for clear recognition
• Available in Rigid Plastic (1mm), Rigid Plastic 1mm (Self Adhesive Back), Rigid Plastic (2mm), Rigid Plastic 2mm (Self Adhesive Back) and Self Adhesive Vinyl
• Helps reduce slips, trips and falls in hazardous environments
£2.26
Details View details  
CCTV In Operation warning sign with CCTV camera symbol for commercial and public premises
CCTV In Operation Sign
Warn visitors and staff that CCTV surveillance is in operation with this highly visible warning sign for commercial and public environments.
• Clearly informs people that CCTV monitoring is in operation
• Ideal for entrances, commercial premises, construction sites and public access areas
• High-visibility yellow and black design for clear recognition
• Available in Rigid Plastic (1mm), Rigid Plastic 1mm (Self Adhesive Back), Rigid Plastic (2mm), Rigid Plastic 2mm (Self Adhesive Back) and Self Adhesive Vinyl
• Helps deter unauthorised activity and improve site security awareness
£2.26
Details View details  
Warning Forklift Trucks Operating safety sign for warehouses and industrial workplaces
Forklift Trucks Operating Sign
Warn staff and visitors to active forklift truck movements with this highly visible warning sign for workplaces and industrial environments.
• Warns people about forklift truck activity in the area
• Ideal for warehouses, factories, loading bays, yards and industrial sites
• High-visibility yellow and black design for clear recognition
• Available in Rigid Plastic (1mm), Rigid Plastic 1mm (Self Adhesive Back), Rigid Plastic (2mm), Rigid Plastic 2mm (Self Adhesive Back) and Self Adhesive Vinyl
• Helps reduce collision risks and improve pedestrian safety around moving vehicles
£4.07
Details View details  
Warning Loading In Progress safety sign with hazard and forklift symbols for warehouses and loading bays
Warning Loading In Progress Sign
Warn staff and visitors of active loading operations with this highly visible warning sign for workplaces and industrial environments.
• Alerts staff and visitors to loading activity hazards
• Ideal for warehouses, loading bays and industrial sites
• High-visibility yellow and black design for clear recognition
• Available in Rigid Plastic (1mm), Rigid Plastic (2mm) and Self Adhesive Vinyl
• Helps improve workplace awareness and reduce loading-related accidents
£12.31
Details View details  
Danger Of Death Electrical warning sign with electrical hazard symbol for high-voltage areas
Danger of Death Electrical Sign
Warn staff and visitors of potentially fatal electrical hazards with this highly visible danger sign for high-risk environments.
• Alerts individuals to deadly electrical danger
• Ideal for substations, electrical rooms and high-voltage areas
• High-visibility yellow and black design for clear recognition
• Available in Rigid Plastic (1mm), Rigid Plastic 1mm (Self Adhesive Back), Rigid Plastic (2mm), Rigid Plastic 2mm (Self Adhesive Back) and Self Adhesive Vinyl
• Helps reduce the risk of serious injury or death by clearly identifying life-threatening electrical hazards
£2.26
Details View details  
Danger Overhead Cables Height Limit electrical warning sign with electrical hazard symbol
Danger Overhead Cables Height Limit Electrical Sign
Warn staff, contractors and visitors of overhead electrical cables and height restrictions with this highly visible danger sign for hazardous environments.
• Alerts people to overhead cable hazards and height restrictions
• Suitable for construction sites, industrial areas and access routes
• High-visibility yellow and black design for clear recognition
• Available in Rigid Plastic (1mm), Rigid Plastic (2mm) and Self Adhesive Vinyl
• Helps reduce the risk of vehicles or equipment striking live overhead cables
£12.31
Details View details  
Danger High Voltage Cables Overhead electrical warning sign with electrical hazard symbol
Danger High Voltage Cables Overhead Electrical Sign
Warn staff, contractors and visitors of dangerous overhead high voltage cables with this highly visible electrical hazard sign.
• Alerts people to the presence of overhead high voltage cables
• Suitable for construction sites, industrial areas and utility zones
• High-visibility yellow and black design for clear recognition
• Available in Rigid Plastic (1mm), Rigid Plastic 1mm (Self Adhesive Back), Rigid Plastic (2mm), Rigid Plastic 2mm (Self Adhesive Back) and Self Adhesive Vinyl
• Helps reduce the risk of accidental contact with live electrical cables
£5.72
Details View details  
Danger Demolition In Progress warning safety sign with yellow hazard symbol
Danger Demolition In Progress Sign
Warn people that demolition work is taking place with this Danger Demolition In Progress Sign.
• Alerts workers, visitors and the public to demolition activity
• Suitable for construction sites, demolition zones, refurbishment projects and restricted work areas
• Bold warning symbol and clear text provide excellent visibility and recognition
• Available in Rigid Plastic (1mm) and Rigid Plastic (2mm)
• Helps reduce risk by clearly identifying hazardous demolition areas
£8.19
Details View details  
Warning CCTV Monitors This Site sign with CCTV camera symbol for commercial and industrial premises
Warning CCTV Monitors This Site Sign
Warn staff, visitors and intruders that CCTV surveillance is actively monitoring this site with this highly visible warning sign.
• Clearly informs visitors and intruders of active CCTV monitoring
• Suitable for construction sites, industrial premises and commercial properties
• High-visibility yellow and black design for clear recognition
• Available in Rigid Plastic (1mm) and Rigid Plastic (2mm)
• Helps improve site security awareness and acts as a visible deterrent
£8.19
Details View details  
Warning Construction Site Keep Out safety sign with warning and mandatory symbols
Warning Construction Site Keep Out Sign
Restrict unauthorised access and highlight construction hazards with this highly visible warning and mandatory safety sign.
• Prevents unauthorised entry to hazardous construction areas
• Ideal for building sites, development zones and restricted workspaces
• High-visibility yellow and blue design for clear recognition
• Available in Rigid Plastic (1mm) and Rigid Plastic (2mm)
• Helps maintain site safety and reinforce access restrictions
£8.19
Details View details  
Danger Men Working Overhead safety sign with warning symbol for construction and industrial workplaces
Danger Men Working Overhead Sign
Warn staff and visitors of overhead work hazards with this highly visible danger safety sign.
• Alerts people to overhead work and falling object risks
• Suitable for construction sites, industrial areas and maintenance zones
• High-visibility yellow and black design for clear recognition
• Available in Rigid Plastic (1mm)
• Helps reduce the risk of injury in active overhead working areas
£8.19
Details View details  
Danger Men At Work warning safety sign
Danger Men At Work Sign
Alerts workers, visitors, and contractors to hazardous active work areas.
• Warns people of dangerous work operations
• Suitable for construction sites, industrial areas and workplaces
• Bold yellow warning design for clear visibility
• Available in Rigid Plastic (1mm) and Rigid Plastic (2mm)
• Helps reduce risk around active work zones
£8.19
Details View details  
Danger High Voltage No Admittance Authorised Personnel Only safety sign with electrical hazard and prohibition symbols
Danger High Voltage - No Admittance Authorised Personnel Only Sign
Warn of high voltage hazards and restrict access to authorised personnel only with this highly visible combined danger and prohibition safety sign.
• Clearly warns of electrical danger and restricted access
• Ideal for plant rooms, electrical areas and restricted zones
• High-visibility yellow, black and red design for clear recognition
• Available in Aluminium Composite (3mm), Rigid Plastic (1mm), Rigid Plastic 1mm (Self Adhesive Back), Rigid Plastic (2mm), Rigid Plastic 2mm (Self Adhesive Back) and Self Adhesive Vinyl
• Helps prevent unauthorised entry and reduce the risk of electrical injury
£4.07
Details View details  
Danger Explosive Atmosphere EX ATEX Category 1 safety sign with recognised EX hazard symbol
Danger Explosive Atmosphere Sign - EX Atex Category 1
Warn staff and visitors of explosive atmosphere hazards in ATEX Category 1 areas with this highly visible danger safety sign.
• Alerts individuals to the presence of a potentially explosive atmosphere
• Ideal for hazardous zones, industrial sites, refineries and chemical plants
• High-visibility yellow and black design for clear recognition
• Available in Rigid Plastic (1mm), Rigid Plastic 1mm (Self Adhesive Back), Rigid Plastic (2mm), Rigid Plastic 2mm (Self Adhesive Back) and Self Adhesive Vinyl
• Helps improve awareness of explosive atmosphere risks and supports safe working practices
£2.26
Details View details  
Danger Explosive Atmosphere EX ATEX Category 2 safety sign with recognised EX hazard symbol
Danger Explosive Atmosphere Sign - EX Atex Category 2
Warn staff and visitors of explosive atmosphere hazards in ATEX Category 2 areas with this highly visible danger safety sign.
• Clearly identifies areas where explosive atmospheres may occur
• Suitable for industrial sites, factories and hazardous zones
• High-visibility yellow and black design for clear recognition
• Available in Rigid Plastic (1mm), Rigid Plastic 1mm (Self Adhesive Back), Rigid Plastic (2mm), Rigid Plastic 2mm (Self Adhesive Back) and Self Adhesive Vinyl
• Helps maintain ATEX compliance and improve workplace safety awareness
£2.26
Details View details  
Danger Explosive Atmosphere EX ATEX Category 3 safety sign with recognised EX hazard symbol
Danger Explosive Atmosphere Sign - EX Atex Category 3
Warn staff and visitors of explosive atmosphere hazards in ATEX Category 3 areas with this highly visible danger safety sign.
• Alerts personnel to explosive atmosphere hazards
• Suitable for industrial sites, refineries and hazardous zones
• High-visibility yellow and black design for clear recognition
• Available in Rigid Plastic (1mm), Rigid Plastic 1mm (Self Adhesive Back), Rigid Plastic (2mm), Rigid Plastic 2mm (Self Adhesive Back) and Self Adhesive Vinyl
• Helps reduce risk and improve workplace safety compliance
£2.26
Details View details  
Danger Asbestos Keep Out safety sign with warning symbol and restricted access message
Pack of 6 Danger Asbestos Keep Out Signs
Warns individuals of asbestos hazards and restricts access to dangerous areas.
• Prevents unauthorised entry where asbestos is present
• Ideal for construction sites, refurbishment areas, and restricted zones
• High-contrast colours and bold symbols ensure clear visibility
• Manufactured using durable Recyclable Correx (4mm)
• Helps maintain safety and controlled access in hazardous environments
£30.85
Details View details  

Construction Warning Signs Guide

Construction Warning Signs are designed to highlight hazards and dangers that may be present on building sites and construction projects. Using recognised yellow and black warning symbols, these signs help workers and visitors identify risks before entering hazardous areas.

From moving plant and machinery to excavation works and overhead hazards, warning signs form an important part of site safety communication and help support effective risk management throughout a project.

Where Are Construction Warning Signs Used?

  • Construction site entrances
  • Excavation and groundwork areas
  • Scaffolding and elevated work zones
  • Vehicle routes and loading areas
  • Plant and machinery operating zones
  • Temporary work sites
  • Demolition projects
  • Restricted access locations

Available Materials

Self-Adhesive Vinyl

Ideal for smooth indoor surfaces including cabins, doors and equipment.

Rigid Plastic

Durable and suitable for most construction site environments.

Aluminium Composite (3mm)

Provides long-lasting performance and excellent weather resistance outdoors.

Recyclable Correx ® (4mm)

Correx is lightweight and ideal for temporary signage. Can be recycled via many kerbside programs.

Frequently Asked Questions

What are construction warning signs?

Construction warning signs identify hazards and potential dangers on building sites to help reduce risks and improve safety awareness.

What colour are construction warning signs?

Warning signs typically use a yellow background with black symbols and borders to indicate potential hazards.

Where should construction warning signs be installed?

They should be placed wherever hazards exist, including site entrances, excavation areas, machinery zones and restricted access locations.

What hazards do construction warning signs identify?

Common hazards include moving vehicles, excavations, overhead work, hazardous materials, electrical risks and uneven ground.

Are warning signs mandatory on construction sites?

Warning signs should be used wherever significant hazards cannot be eliminated and workers or visitors need to be alerted to risks.

Can construction warning signs be used outdoors?

Yes. Rigid plastic, aluminium and correx signs are suitable for outdoor construction site environments.

Can I order custom construction warning signs?

Yes. Rainbow Safety can manufacture bespoke warning signs featuring custom wording, symbols and site-specific hazards.

Are Rainbow Safety warning signs manufactured in the UK?

Yes. Rainbow Safety manufactures a wide range of construction warning signs in the UK for quality, consistency and fast delivery.

Why Buy From Rainbow Safety?

  • Manufactured in the UK
  • Over 30 years of construction safety signage expertise
  • Fast dispatch on standard products
  • Trade discounts available
  • Custom warning signs manufactured to order
  • Large range of construction and workplace safety signs
  • Trusted by UK contractors, developers and local authorities
  • Expert support from an experienced safety signage team