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.

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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
£14.77
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
£1.82
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
£2.71
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
£9.83
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
£2.71
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
£4.88
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
£12.91
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
£10.81
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
£10.20
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
£10.81
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
£10.81
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
£7.14