Clear Warning Signs help employees, contractors, customers and visitors recognise potential hazards before entering an area or undertaking an activity.

From electrical equipment and moving machinery to slippery surfaces, chemical hazards and construction work, the right warning sign can help communicate important safety information quickly.

At The Sign Shed, we supply a wide range of Safety Warning Signs for businesses, industrial premises, construction sites, warehouses, farms and private property.

Whether you need a single warning notice or several signs for different locations, our range includes recognised safety symbols, practical wording and a choice of materials and sizes.

What Are Warning Signs?

A warning sign is used to draw attention to a hazard or potential danger.

In UK workplace safety signage, warning signs are generally recognised by their yellow triangular design with a black border and black pictogram.

These signs are intended to alert people to a hazard so that they can take appropriate precautions.

Common examples include:

• Warning – Forklift Trucks Operating.
• Danger – Electricity.
• Warning – Hot Surface.
• Caution – Slippery Surface.
• Warning – Overhead Loads.
• Danger – Deep Excavation.
• Warning – Hazardous Chemicals.
• Warning – Farm Vehicles.

The exact sign required depends on the nature of the hazard and where it is present.

Electrical Warning Signs

Electrical warning signs identify risks associated with electrical equipment, installations and restricted electrical areas.

They may be used around switchgear, electrical cupboards, plant rooms and other locations where electrical hazards are present.

Common messages include Danger Electricity, High Voltage and Electrical Hazard.

Choose wording and symbols that accurately communicate the risk.

Machinery & Industrial Warning Signs

Factories, workshops and warehouses may contain moving machinery, automated equipment and vehicle operations.

Relevant warning signs can help identify hazards such as:

• Forklift trucks operating.
• Moving machinery.
• Overhead loads.
• Automatic doors.
• Hot surfaces.
• Vehicle movements.

These notices should be positioned where people need to recognise the hazard before approaching the relevant area.

Construction Hazard Warning Signs

Construction projects can involve changing working areas, vehicle routes and temporary hazards.

Depending on the activity, signs may be needed to warn of deep excavations, overhead work, heavy plant, underground services or other site-specific risks.

Construction warning signs should support appropriate site planning, access controls and risk management arrangements.

Chemical & Hazardous Substance Warning Signs

Chemical warning signs help communicate risks associated with particular substances or activities.

Examples include warnings relating to corrosive materials, toxic substances and flammable hazards.

Select signs that accurately reflect the hazards identified through the relevant assessments.

Workplace safety signs and chemical product hazard labels serve different purposes, so one should not automatically be treated as a substitute for the other.

Farm & Countryside Warning Signs

Farms, agricultural premises and private land can contain hazards unfamiliar to visitors.

Depending on the location, warning signs may identify:

• Livestock or bulls.
• Agricultural machinery.
• Deep water.
• Electric fencing.
• Chemical spraying.
• Restricted working areas.

Choose signs that reflect the actual conditions and place them where the warning is needed.

Warning Signs for Warehouses & Loading Bays

Warehouses often combine pedestrian movement, vehicle traffic and mechanical handling equipment.

Common hazards may include forklift trucks, moving vehicles, loading operations and uneven surfaces.

Warning signs can support safe traffic arrangements by alerting people to these risks.

However, signs should not replace physical segregation, suitable traffic routes or other necessary controls.

Choosing the Right Warning Sign Size

The correct size depends on the distance from which the sign needs to be recognised, the amount of information displayed and the installation location.

A small warning sticker may be appropriate for certain equipment applications.

A larger rigid sign may be more suitable for a warehouse entrance, outdoor access point or industrial working area.

Before ordering, consider:

• Viewing distance.
• Lighting conditions.
• Whether people are walking or driving.
• Available mounting space.
• The amount of wording.
• Possible obstructions.

The aim is to make the warning visible and understandable before the person encounters the hazard.

Self-Adhesive Warning Signs or Rigid Boards?

Self-adhesive vinyl warning signs can be practical for suitable smooth, clean surfaces such as equipment panels, doors and cupboards.

Rigid plastic signs are useful where a separate signboard is preferred.

For outdoor or more demanding installations, compare the available rigid materials, including recycled plastic, Foamex and aluminium composite options where offered.

Material selection should reflect the expected exposure, mounting method and intended lifespan.

Where Should Warning Signs Be Displayed?

Warning signs should be positioned where the relevant audience can see them before reaching the hazard.

Typical locations include:

• Machinery and equipment areas.
• Electrical cupboards and plant rooms.
• Warehouse vehicle routes.
• Loading bays.
• Construction site access points.
• Chemical storage and handling areas.
• Farm gates and agricultural buildings.
• Areas with slipping, tripping or falling hazards.

Avoid positioning signs behind doors, stored materials, equipment or other obstructions.

Where site conditions change, review whether the signs remain relevant and correctly positioned.

Warning Signs and UK Health & Safety Regulations

The Health and Safety (Safety Signs and Signals) Regulations 1996 require appropriate safety signage where significant risks remain after other relevant control measures have been taken.

BS EN ISO 7010 provides recognised graphical symbols for many safety signs, helping communicate warnings consistently.

However, warning signs do not remove the underlying hazard and should not be relied upon as the sole safety measure.

The appropriate signage depends on the risk assessment, the workplace and the people who may encounter the hazard.

Buy Warning Signs from The Sign Shed

Whether you're fitting out a new workplace, replacing damaged signs or ordering signage for several premises, The Sign Shed offers a broad selection of Warning Signs for UK businesses and organisations.

Explore our electrical warnings, construction hazard signs, machinery notices, chemical warnings and countryside safety signs.

Choose from a range of sizes and materials to suit your application.

Made in Britain, with fast dispatch on eligible orders and automatic bulk savings of up to 30%.

Find the right warning signs for your workplace at The Sign Shed.