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 hazard and access restriction symbols
Warning Construction Site Keep Out Sign - BS 5499 Compliant

Warning construction site keep out sign designed to prevent unauthorised access and improve safety awareness in hazardous work areas.
• Helps warn individuals to keep out of dangerous construction and restricted access zones
• Suitable for construction sites, renovation projects, perimeter fencing, and work areas
• High-contrast warning colours and bold symbols ensure excellent visibility and readability
• Manufactured from Aluminium Composite (3mm), Aluminium Composite With Fixing Channel (3mm), Rigid Plastic (1mm), and 4mm Recyclable Correx ®
• Supports improved site safety control and helps reduce the risk of accidents and unauthorised entry
£8.19
Details View details  
Warning Construction Site Keep Out safety sign with hazard symbol and instruction
Warning Construction Site Keep Out Signs - Pack of 10
High-visibility warning sign instructing individuals to keep out of active construction areas.

Warns of construction hazards and restricts unauthorised access
Ideal for construction sites, building zones, and roadside works
Bold colours and clear symbols ensure maximum visibility and understanding
Available in Rigid Plastic (1mm) and Recyclable Correx ® (4mm)
Helps improve public safety and reduce risk around active work areas
£161.18
Details View details  
Danger Keep Out safety sign with hazard symbol and restricted access message
Danger Keep Out Sign
Warns individuals to stay out of hazardous or restricted areas to prevent accidents and unauthorised access
• Clearly communicates danger and restricted access
• Ideal for construction sites, industrial areas, and restricted zones
• Bold colours and symbols ensure high visibility and instant recognition
• Available in durable materials suitable for various environments
• Helps maintain safety, security, and compliance in the workplace
£5.95
Details View details  
Danger high voltage electrical warning sign with lightning bolt symbol
Danger High Voltage Electrical Sign
Warns individuals of dangerous high voltage electrical hazards to prevent serious injury or death
• Alerts people to the presence of high voltage electricity
• Suitable for electrical rooms, substations, and industrial environments
• High contrast yellow and black design ensures clear visibility
• Available in durable materials for indoor and outdoor use
• Helps reduce risk and improve workplace safety compliance
£2.19
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 sign
Danger Confined Space No Unauthorised Entry Permit To Work Must Be Obtained Sign
Danger confined space no unauthorised entry permit to work must be obtained sign designed to warn of confined space hazards and restrict access to authorised personnel only.
• Helps warn individuals of confined space dangers and enforces permit to work requirements before entry
• Suitable for industrial sites, construction areas, plant rooms, and restricted access zones
• High-contrast warning colours and bold symbols ensure strong visibility and quick understanding
• Manufactured from Rigid Plastic (1mm) and Self Adhesive Vinyl for durable indoor and outdoor use
• Supports workplace safety compliance and helps prevent unauthorised entry into hazardous confined spaces
£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
£9.01
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
£9.01
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 sign
Danger High Voltage Cables Underground Electrical Sign
Warns of buried high voltage electrical cables to prevent accidental contact or excavation hazards.
• Alerts individuals to underground high voltage cable danger
• Ideal for construction sites, excavation areas, and utility zones
• High-contrast yellow and black design ensures clear visibility
• Available in durable materials suitable for long-term use
• Helps reduce risk of serious injury or electrical accidents
£2.19
Details View details  
Danger Fragile Roof warning sign with slipping figure symbol
Danger Fragile Roof Sign
Warns individuals of fragile roofing hazards to prevent accidents and falls.

Clearly alerts to fragile roof dangers
Suitable for construction sites, industrial buildings, and maintenance areas
High-contrast design ensures strong visibility
Available in durable Rigid Plastic (1mm) and Self Adhesive Vinyl
Helps reduce risk of serious injury when working at height
£4.07
Details View details  
Danger Drop Below warning safety sign
Danger Drop Below Warning Sign
Warn individuals of dangerous drop hazards with this highly visible warning safety sign designed to help prevent falls and serious injury.
• Alerts individuals to the risk of a drop below
• Suitable for construction sites, warehouses, elevated walkways, platforms, and hazardous edges
• High-visibility yellow warning design with bold black symbol and text
• Available in Rigid Plastic (1mm), Rigid Plastic (2mm), and Self Adhesive Vinyl
• Helps improve awareness around exposed edges and fall hazards
£2.26
Details View details  
Danger Fragile Roof warning sign with falling person symbol
Danger Fragile Roof Site Sign
Warns individuals of fragile roof hazards and risk of falling through surfaces

Clearly communicates fragile roof danger to prevent accidents
Ideal for construction sites, industrial buildings, and maintenance areas
High-contrast design ensures clear visibility from a distance
Available in durable rigid plastic material options
Helps reduce risk of serious injury from unsafe roof access
£8.19
Details View details  
Danger Asbestos Keep Out warning sign with symbols
Danger Asbestos Keep Out Sign - Landscape
Warns individuals to keep out of areas where dangerous asbestos hazards are present to prevent exposure and protect health
• Clearly instructs people to keep out of asbestos hazard zones
• Ideal for construction sites, demolition areas, and restricted workplaces
• Bold colours and symbols ensure high visibility and instant recognition
• Made from durable materials suitable for various environments
• Helps reduce risk of exposure to hazardous asbestos fibres
£2.63
Details View details  
Danger heavy plant crossing warning sign with hazard symbol
Danger Heavy Plant Crossing Sign

Warns of heavy plant crossing areas to reduce risk and improve site safety

Alerts pedestrians and drivers to heavy plant movement
Ideal for construction sites, industrial yards, and logistics areas
High-visibility yellow background with bold black text and symbol
Available in multiple durable material options for various environments
Helps prevent accidents and supports safe traffic management

£12.31
Details View details  
Warning Lorries Turning safety sign with hazard symbol and text
Warning Lorries Turning Sign
Warns pedestrians and drivers of turning lorries to reduce the risk of collisions and improve site safety
• Alerts individuals to lorry turning hazards
• Ideal for construction sites, industrial estates, and delivery areas
• High-visibility design ensures clear and immediate recognition
• Available in durable materials for long-term use
• Helps prevent accidents involving large 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 hazard symbol and text
Warning Site Entrance Sign

Warns individuals of potential hazards when entering a site to improve awareness and maintain safety
• Alerts people to hazards at site entry points
• Ideal for construction sites, industrial areas, and work zones
• High-visibility design ensures clear and immediate recognition
• Available in durable materials for long-lasting performance
• Helps ensure safer entry and compliance with site safety requirements
£6.75
Details View details  
Danger Demolition In Progress Sign
Danger Demolition In Progress Sign
Provides a clear warning that demolition work is underway to help protect workers, visitors, and the public.

Warns people about active demolition hazards
Suitable for construction sites, refurbishment areas, and controlled access zones
Bold yellow and black design supports clear visibility
Available in Rigid Plastic (1mm), Rigid Plastic (2mm), and Self Adhesive Vinyl
Helps reduce risk by clearly identifying hazardous work areas
£4.07
Details View details  
Warning Deep Water safety sign with hazard symbol and text
Warning Deep Water Sign
Warns individuals of deep water hazards to reduce the risk of drowning and improve safety awareness
• Alerts people to the presence of deep water
• Ideal for lakes, rivers, docks, and water-side locations
• High-visibility design ensures clear and immediate recognition
• Available in durable materials for long-term use
• Helps prevent accidents and enhances safety around water hazards
£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 sign with hazard symbol and bold text
Danger Asbestos Sign
Warns workers and visitors of hazardous asbestos presence in the area
• Highlights the presence of dangerous asbestos materials
• Ideal for construction sites, demolition areas, and older buildings
• Bold black text on yellow background ensures high visibility
• Available in durable Rigid Plastic (1mm) or 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 sign with lightning symbol
Danger Buried Cables Electrical Sign
Warns of buried electrical cables to prevent accidental damage and serious injury during excavation or ground works.
• Alerts workers to the presence of underground electrical hazards
• Ideal for construction sites, excavation zones, and utility areas
• High-contrast yellow and black design ensures clear visibility
• Available in durable materials suitable for various environments
• Helps reduce risk of cable strikes and associated accidents
£2.19
Details View details  
Danger asbestos warning sign with hazard symbol on yellow background
Danger Asbestos Warning Sign
Warns individuals of the presence of hazardous asbestos materials to prevent exposure and health risks
• Clearly alerts to dangerous asbestos hazards
• Suitable for construction sites, demolition areas, and industrial premises
• High-contrast yellow and black design ensures excellent visibility
• Available in durable rigid plastic or self adhesive vinyl
• Helps reduce risk of accidental 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
£9.01
Details View details  
Caution Change In Floor Level warning safety sign
Caution Change In Floor Level Warning Sign
Warn people of uneven or changing floor levels with this highly visible caution safety sign designed to help prevent trips and falls.
• Alerts individuals to uneven or changing floor levels
• Suitable for workplaces, warehouses, offices, entrances, and public buildings
• High-visibility yellow warning design with bold black symbol and text
• Available in Rigid Plastic (1mm) and Self Adhesive Vinyl
• Helps reduce trip hazards and improve overall site safety
£2.26
Details View details  
Danger Demolition in Progress warning sign
Danger Demolition in Progress Sign
Warn people that demolition work is taking place with this clear 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 help improve visibility
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 sign with hazard symbol and yellow background
Warning Site Entrance Sign
Warns drivers and pedestrians of site entrance hazards to improve safety and awareness.
• Clearly alerts to site entrance hazards and risks
• Ideal for construction sites, building developments, and work zones
• High-contrast yellow and black design ensures strong visibility
• Available in durable rigid plastic or self adhesive vinyl options
• Helps reduce accidents by improving awareness at entry points
£5.95
Details View details  
Danger Asbestos No Admittance Protective Clothing safety sign
Danger Asbestos No Admittance Protective Clothing Sign
Warns of asbestos hazards, restricts unauthorised entry, and requires protective clothing before access
• Clearly communicates asbestos danger and restricted access requirements
• Ideal for asbestos-contaminated areas, construction sites, and plant rooms
• Bold colours and clear symbols ensure high visibility and quick understanding
• Available in Rigid Plastic (1mm) and Self Adhesive Vinyl
• Helps enforce safety procedures and protect personnel from hazardous exposure
£5.72
Details View details  
Danger Asbestos Keep Out safety sign with hazard symbols
Danger Asbestos Keep Out Sign
Warns individuals to keep away from hazardous asbestos areas to prevent exposure risks
• Clearly communicates restricted access due to asbestos danger
• Ideal for construction sites, demolition areas, and industrial workplaces
• High-contrast design ensures excellent visibility and readability
• Available in durable Rigid Plastic (1mm) or Self Adhesive Vinyl
• Helps reduce risk of exposure and supports site safety management
£5.72
Details View details  
Warning concealed entrance sign with hazard symbol and yellow background
Warning Concealed Entrance Sign

Warns people of hidden or concealed entrances to reduce risk and improve safety awareness.
• Alerts 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 and self adhesive vinyl material options
• Helps prevent accidents by improving awareness of hidden access points
£9.01
Details View details  
Warning construction site keep out sign with hazard symbol and keep out message
Warning Construction Site Keep Out Sign
Warns of construction site hazards and instructs unauthorised persons to keep out for safety.
• Clearly communicates restricted access to construction areas
• Ideal for building sites, development zones, and hazardous work areas
• High-visibility yellow, black, and blue design ensures clear messaging
• Available in rigid plastic material options for durability
• Helps prevent unauthorised entry and reduces risk of accidents
£8.19
Details View details  
Danger Scaffolding Incomplete safety warning sign with symbol
Danger Scaffolding Incomplete Sign
Warns people of incomplete scaffolding and potential fall hazards on site
• Clearly alerts workers and visitors to unsafe scaffolding conditions
• Suitable for construction sites, maintenance areas, and building works
• High-visibility yellow and black design ensures instant recognition
• Available in durable rigid plastic materials for long-lasting use
• Helps prevent accidents and restrict access to unsafe structures
£8.19
Details View details  
Danger Deep Water warning sign with hazard symbol
Danger Deep Water Sign
Warns individuals of deep water hazards to prevent accidents and drowning.
• Clearly alerts people to the presence of deep water hazards
• Suitable for construction sites, docks, waterways, and industrial areas
• High-contrast design ensures excellent visibility and quick recognition
• Manufactured using durable materials for long-lasting performance
• Helps reduce risk and improve overall site safety awareness
£8.19
Details View details  
Danger high voltage cables underground warning sign with electrical hazard symbol
Danger High Voltage Cables Underground Sign
Warns workers and the public of buried high voltage electrical cables to prevent accidental contact and serious injury.
• Clearly warns of underground high voltage cables
• Ideal for construction sites, excavation areas, and industrial zones
• High-contrast yellow and black design ensures maximum visibility
• Available in durable materials suitable for long-term use
• Helps reduce risk of electrical hazards and supports safe working practices
£5.95
Details View details  
Danger asbestos dust warning sign with yellow hazard symbol
Danger Asbestos Dust Sign
Warns of hazardous asbestos dust presence to protect health and safety in high-risk areas.
• 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
• Available in durable Rigid Plastic (1mm) and Self Adhesive Vinyl
• Helps reduce risk of respiratory harm by alerting workers and visitors
£2.26
Details View details  
Danger Asbestos Removal warning safety sign with hazard symbol
Danger Asbestos Removal Sign
Warns workers and visitors of hazardous asbestos removal activities in the area
• Clearly communicates the presence of asbestos removal hazards
• Suitable for construction sites, demolition areas, and industrial workplaces
• High-contrast design ensures excellent visibility and readability
• Available in durable materials for long-lasting use
• Helps reduce risk and improve on-site safety awareness
£2.26
Details View details  
Danger Asbestos Removal safety warning sign with hazard symbol
Danger Asbestos Removal Sign - Landscape
Warns workers and visitors of hazardous asbestos removal operations in the area
• Clearly alerts to dangerous asbestos removal activity
• Ideal for construction sites, demolition areas, and refurbishment projects
• High-contrast yellow and black design ensures excellent visibility
• Available in durable Rigid Plastic (1mm) or Self Adhesive Vinyl
• Helps reduce health risks by improving hazard awareness on site
£6.13
Details View details  
Danger Asbestos Keep Out safety warning sign with hazard and mandatory symbols
Danger Asbestos Keep Out Sign
Warns of dangerous asbestos presence and restricts access to protect health and safety.
• Clearly warns of asbestos hazard and restricted access requirement
• Ideal for construction sites, demolition areas, and hazardous zones
• Bold colours and clear text ensure high visibility and immediate recognition
• Available in durable materials suitable for various environments
• Helps prevent exposure to harmful asbestos fibres and ensures site safety compliance
£5.72
Details View details  
Danger asbestos being removed no unauthorised persons safety sign
Danger Asbestos Being Removed No Persons Sign
Warns that asbestos removal is in progress and prohibits unauthorised access to the area.
• Prevents entry into hazardous asbestos removal zones
• Ideal for construction sites, demolition areas, and restricted workspaces
• Bold colours and clear symbols ensure high visibility and instant recognition
• Available in durable materials suitable for indoor and outdoor use
• Helps reduce exposure risk and maintain site safety compliance
£4.94
Details View details  
Danger asbestos zone respirator must be worn safety sign with warning and mandatory symbols
Danger Asbestos Zone Respirator Must Be Worn Sign
Ensure mandatory respiratory protection in hazardous asbestos areas with this clear and highly visible safety sign.
• Instructs personnel to wear respirators in asbestos zones
• Ideal for construction sites, demolition areas, and contaminated environments
• Bold colours and clear symbols for immediate recognition
• Available in durable materials suitable for long-term use
• Helps maintain safety compliance and reduce exposure risk
£5.72
Details View details  
Danger Asbestos Dust warning sign with hazard symbol
Danger Asbestos Dust Sign - Landscape
Warns individuals of the presence of hazardous asbestos dust to reduce exposure risks.
• Clearly alerts people to dangerous airborne asbestos dust
• Ideal for construction sites, demolition areas, and industrial workplaces
• High-contrast design ensures clear visibility and instant recognition
• Available in durable materials suitable for long-term use
• Helps minimise health risks by reinforcing safety awareness
£1.52
Details View details  
Danger overhead live wires electrical warning sign with lightning symbol
Danger Overhead Live Wires Electrical Sign
Warns individuals of hazardous overhead live electrical wires to prevent serious injury or fatal accidents.
• 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 immediate recognition
• Available in durable materials for long-lasting performance
• Helps reduce risk of accidental contact with live wires
£5.55
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 yellow background and black text
Warning Men At Work Sign
Clear warning sign alerting people to active work areas and potential hazards.
• Indicates active work zones to improve safety awareness
• Ideal for construction sites, industrial areas, and maintenance zones
• High-contrast yellow and black design ensures excellent visibility
• Available in durable material options for long-lasting use
• Helps reduce accidents by warning visitors and staff of ongoing work
£6.75
Details View details  
Warning Site Traffic safety sign with hazard symbol and text
Warning Site Traffic Sign

Warns drivers and pedestrians of site traffic hazards to improve safety awareness in active work areas.
• 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 multiple durable material options for various environments
• Helps reduce accidents by increasing awareness of vehicle movement
£9.01
Details View details  
Warning to public private property no unauthorised persons safety sign
Warning To Public Sign

Warns the public that a site is private property and unauthorised access is prohibited.
• Prevents unauthorised entry and trespassing
• Ideal for building sites, construction areas, and private land
• High-contrast yellow and black design for clear visibility
• Available in durable materials suitable for indoor and outdoor use
• Helps reduce liability and reinforces site safety rules
£9.01
Details View details  
Danger scaffolding incomplete warning sign with symbol
Danger Scaffolding Incomplete Sign
Warns that scaffolding is incomplete and unsafe for use.
• Clearly alerts people to incomplete scaffolding hazards
• Suitable for construction sites and maintenance areas
• High-visibility yellow and black design for quick recognition
• Available in durable material options for various environments
• Helps prevent accidents and restrict unsafe access
£5.72
Details View details  
Danger asbestos permit to work must be obtained sign with warning and mandatory symbols
Danger Asbestos Permit To Work Must Be Obtained Sign
Danger asbestos permit to work must be obtained sign designed to warn of asbestos hazards and restrict access until authorised work procedures are followed.
• Helps warn individuals of asbestos dangers and enforces permit to work requirements before access
• Suitable for construction sites, refurbishment areas, restricted zones, and hazardous work environments
• High-contrast warning colours and bold symbols ensure strong visibility and quick understanding
• Manufactured from Rigid Plastic (1mm) and Self Adhesive Vinyl for durable indoor and outdoor use
• Supports safe working procedures and helps control access to asbestos hazard areas
£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 warning safety sign
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 ensures clear warning
• Available in Rigid Plastic (1mm) and Self Adhesive Vinyl
• Helps reduce slips, trips, and falls in hazardous environments
£4.07
Details View details  
CCTV In Operation warning sign with camera symbol
CCTV In Operation Sign
Clearly warn visitors and deter unauthorised activity with this highly visible CCTV In Operation Sign.
• Alerts people that CCTV monitoring is active to deter crime and improve security
• Ideal for entrances, commercial properties, construction sites, and public areas
• High-visibility yellow and black design with clear text and camera symbol ensures instant recognition
• Available in Rigid Plastic (1mm), Rigid Plastic (2mm), and Self Adhesive Vinyl
• Helps support site security awareness and reinforce monitored premises
£2.26
Details View details  
Forklift Trucks Operating warning safety sign for industrial vehicle areas
Forklift Trucks Operating Sign
Forklift Trucks Operating Sign warns staff and visitors about active forklift truck movements in workplace and industrial environments.
• Warns people to be aware of forklift truck activity in the area
• Ideal for warehouses, factories, loading bays, yards, and industrial sites
• High-visibility yellow and black warning design ensures clear recognition
• Available in Rigid Plastic (1mm) and Self Adhesive Vinyl
• Helps reduce collision risks and improve pedestrian safety around vehicles
£4.07
Details View details  
Warning Loading In Progress safety sign with forklift hazard symbol
Warning Loading In Progress Sign
Warn individuals of active loading operations with this highly visible Warning Loading In Progress sign.
• Alerts staff and visitors to loading activity hazards
• Ideal for warehouses, loading bays, and industrial sites
• High-contrast yellow and black design ensures strong visibility
• Available in Rigid Plastic (1mm) 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 electric shock symbol
Danger of Death Electrical Sign
Warns of a potentially fatal electrical hazard to prevent serious injury or death.
• Alerts individuals to deadly electrical danger
• Ideal for substations, electrical rooms, and high-voltage areas
• High-contrast yellow and black design ensures strong visibility
• Available in durable materials suitable for indoor and outdoor use
• Helps reduce risk by clearly communicating life-threatening hazards
£2.26
Details View details  
Danger Overhead Cables Height Limit electrical warning sign
Danger Overhead Cables Height Limit Electrical Sign
Warn individuals of overhead electrical cables and height restrictions with this highly visible electrical hazard safety sign.
• Alerts people to overhead cable hazards and height restrictions
• Suitable for construction sites, industrial areas, and access routes
• High-contrast yellow and black design ensures clear visibility
• Available in Rigid Plastic (1mm) and Self Adhesive Vinyl
• Helps reduce the risk of vehicles or equipment striking live cables
£11.95
Details View details  
Danger High Voltage Cables Overhead electrical warning sign
Danger High Voltage Cables Overhead Electrical Sign
Warn individuals of dangerous overhead high voltage cables with this highly visible electrical hazard safety sign.
• Alerts people to the presence of overhead high voltage cables
• Suitable for construction sites, industrial areas, and utility zones
• High-contrast yellow and black design ensures clear visibility
• Available in Rigid Plastic (1mm) 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 sign with hazard symbol
Danger Demolition In Progress Sign
Warns of active demolition work to reduce risk and improve site safety awareness

Alerts workers and visitors to demolition activity hazards
Ideal for construction sites, demolition zones, and site entrances
High-visibility yellow and black design for clear warning communication
Available in durable rigid plastic material options
Helps prevent accidents and supports safe site management
£8.19
Details View details  
Warning CCTV monitors this site yellow and black safety sign with camera symbol
Warning CCTV Monitors This Site Sign
Warns individuals that CCTV surveillance is actively monitoring the area to deter unauthorised activity
• Clearly informs visitors and intruders of active CCTV monitoring
• Suitable for construction sites, industrial premises, and commercial properties
• High-contrast yellow and black design ensures strong visibility and quick recognition
• Manufactured using durable rigid plastic materials for long-lasting use
• Helps improve site security awareness and acts as a visual deterrent
£8.19
Details View details  
Warning construction site keep out safety sign with hazard and mandatory symbols
Warning Construction Site Keep Out Sign
Ensure restricted access and highlight construction hazards with this clear warning and mandatory safety sign.
• Prevents unauthorised entry to hazardous construction areas
• Ideal for building sites, development zones, and restricted workspaces
• Bold colours and clear text ensure high visibility from a distance
• Available in durable Rigid Plastic options for long-lasting use
• Helps maintain site safety and regulatory compliance
£8.19
Details View details  
Danger Men Working Overhead safety warning sign
Danger Men Working Overhead Sign
Warn workers 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
• Bold yellow warning design supports quick recognition
• Available in Rigid Plastic (1mm) and Rigid Plastic (2mm)
• Helps reduce risk around 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
Danger High Voltage - No Admittance Authorised Personnel Only Sign
Warns of high voltage hazards and restricts access to authorised personnel only
• Clearly warns of electrical danger and restricted access
• Ideal for plant rooms, electrical areas, and restricted zones
• High-contrast colours and bold symbols for maximum visibility
• Durable construction suitable for long-term use
• Helps prevent unauthorised entry and reduce risk of injury
£3.17
Details View details  
Danger explosive atmosphere EX ATEX Category 1 safety sign
Danger Explosive Atmosphere Sign - EX Atex Category 1
Warns of explosive atmosphere risk in ATEX Zone 1 areas to prevent ignition and serious injury
• Alerts individuals to the presence of a potentially explosive atmosphere
• Ideal for hazardous zones, industrial sites, refineries, and chemical plants
• High-contrast design with clear EX symbol and bold text for maximum visibility
• Manufactured from durable materials suitable for demanding environments
• Helps ensure compliance and improves overall site safety awareness
£2.26
Details View details  
Danger explosive atmosphere EX ATEX Category 2 warning sign
Danger Explosive Atmosphere Sign - EX Atex Category 2
Warns of an explosive atmosphere in ATEX Zone 2 areas to reduce ignition risks and improve safety awareness.
• Clearly identifies areas where explosive atmospheres may occur
• Suitable for industrial sites, factories, and hazardous zones
• High-contrast yellow and black design ensures strong visibility
• Manufactured using durable, long-lasting materials
• Helps maintain ATEX compliance and protect personnel
£2.26
Details View details  
Danger Explosive Atmosphere ATEX Category 3 safety sign
Danger Explosive Atmosphere Sign - EX Atex Category 3
Warns of the presence of a potentially explosive atmosphere in designated areas.
• Alerts personnel to explosive atmosphere hazards
• Suitable for industrial sites, refineries, and hazardous zones
• High-contrast design ensures clear visibility
• Available in multiple durable material options
• 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