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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Warning Construction Site Keep Out Sign with warning and mandatory safety symbols

Warning Construction Site Keep Out Sign


Clearly warns people of a construction site and instructs them to keep out, helping prevent unauthorised access to hazardous work areas.
• 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 Aluminium Composite (3mm), Rigid Plastic (1mm), Rigid Plastic (2mm), Self Adhesive Vinyl and Recyclable Correx ® (4mm)
• Helps reinforce restricted access controls and reduce entry into hazardous work areas
£6.86
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
£193.42
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
£9.83
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
£4.88
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
£2.71
Caution plant room sign with authorised personnel only and door locked instructions

Caution Plant Room Sign

Caution plant room sign designed to warn of plant room hazards and restrict access to authorised personnel only.• Helps alert individuals to potential plant room hazards and restricted access requirements• Suitable for plant rooms, boiler rooms, maintenance areas, and restricted service 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 workplace safety procedures and helps secure restricted access areas
£6.86
Tree Protection Area Keep Out Sign with yellow background and black safety instructions

Tree Protection Area Keep Out Sign

Clearly identifies a protected tree area and instructs people to keep out, helping prevent damage and reinforce site protection requirements.
• Clearly marks protected tree zones and restricts access to the area
• Suitable for construction sites, development projects and protected land areas
• High-visibility yellow background with clear black text provides easy recognition
• Available in Rigid Plastic (1mm), Rigid Plastic (2mm), Self Adhesive Vinyl and Recyclable Correx ® (4mm)
• Helps protect trees by reinforcing restrictions within designated protection areas
£10.20
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
£4.88
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
£6.86
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
£8.10
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
£2.71
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