Warning Signs

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


Warning Construction Site Keep Out Sign clearly warns people of construction hazards and instructs unauthorised individuals to stay out of designated work areas.
• Combines a construction site warning with a clear keep out instruction to discourage unauthorised access.
• Ideal for construction sites, renovation projects, perimeter fencing, site entrances and active work zones.
• High-contrast yellow warning and blue mandatory symbols with bold lettering provide clear visibility.
• 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 reinforce site access restrictions and improve awareness of potentially hazardous construction areas.
£5.72
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
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
£3.04
Warning Deep Excavations Sign

Warning Deep Excavations Sign

Warning Deep Excavations Sign clearly alerts workers and visitors to deep excavation hazards in designated work areas to help prevent accidents and improve site safety.
• Warns of deep excavations and helps reduce the risk of falls and related injuries.
• Ideal for construction sites, civil engineering projects, groundwork areas and excavation zones.
• Bold black lettering and a recognisable warning triangle on a yellow background provide clear visibility.
• Available in Aluminium Composite (3mm), Aluminium Composite With Fixing Channel (3mm), Rigid Plastic (1mm), Self Adhesive Vinyl and Recyclable Correx ® (4mm).
• Helps reinforce excavation hazard awareness and encourages safer working practices around open excavations.
£4.07
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
Tree Protection Area Keep Out Sign

Tree Protection Area Keep Out Sign

Tree Protection Area Keep Out Sign clearly identifies protected tree zones and communicates restrictions designed to prevent damage to trees during construction and development work.
• Warns people to keep out of designated tree protection areas and reinforces restrictions on activities within protected zones.
• Ideal for construction sites, development projects, landscaping works and areas containing protected trees.
• High-visibility yellow background with bold black lettering provides clear instructions and easy recognition.
• Available in Aluminium Composite (3mm), Rigid Plastic (1mm), Rigid Plastic (2mm), Self Adhesive Vinyl and Recyclable Correx ® (4mm).
• Helps protect trees by reinforcing restrictions on access, excavation, machinery, material storage and removal of protective fencing.
£8.50
Caution Plant Room Sign

Caution Plant Room Sign

Caution Plant Room Sign clearly warns workers and visitors of potential plant room hazards while reinforcing authorised access restrictions and door security requirements.
• Warns of plant room hazards and instructs unauthorised personnel to keep out and the door to remain locked.
• Ideal for plant rooms, boiler rooms, maintenance areas, service rooms and restricted technical environments.
• High-contrast yellow, red and blue safety panels with recognisable symbols provide clear visibility.
• Available in Aluminium Composite (3mm), Rigid Plastic (1mm) and Self Adhesive Vinyl.
• Helps improve workplace safety awareness and reinforces secure access procedures in restricted plant room areas.
£4.07
Men Working Overhead Warning Sign

Warning Men Working Overhead Sign


Warning Men Working Overhead Sign clearly alerts workers and visitors to overhead work hazards in designated areas to help improve workplace safety awareness.
• Warns individuals of overhead work activities and potential hazards from work taking place above.
• Ideal for construction sites, warehouses, industrial premises, maintenance areas and active work zones.
• Bold black lettering and a recognisable warning triangle on a yellow background provide clear visibility.
• 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 reinforce overhead hazard awareness and encourages safer working practices around active work areas.
£6.75
Beware Of Moving Vehicles Sign

Warning Beware Of Moving Vehicles Sign

Warning Beware Of Moving Vehicles Sign clearly alerts pedestrians, workers and visitors to moving vehicle hazards in busy workplace and industrial environments.
• Warns individuals of moving vehicles and helps reduce the risk of traffic-related accidents.
• Ideal for warehouses, loading bays, construction sites, factories and industrial traffic areas.
• Bold black lettering and a recognisable warning triangle on a yellow background provide clear visibility.
• Available in Rigid Plastic (1mm), Rigid Plastic 1mm (Self Adhesive Back) and Self Adhesive Vinyl.
• Helps improve pedestrian awareness and encourages safer movement around workplace vehicle routes.
£5.72
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
£2.01
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
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
£10.38