Fire Safety on Construction Sites: UK Requirements and Best Practice

Why Construction Sites Burn

Construction sites are some of the highest fire-risk environments in the UK. Temporary electrics running through puddles. Angle grinders throwing sparks into dust-filled rooms. Flammable materials stacked against incomplete walls with no fire compartmentation. Hot works happening three floors up while insulation foam is being applied two floors down.

When a construction site catches fire, the consequences go beyond property damage. Projects get delayed by months. Insurance premiums spike. Neighbouring buildings and the public are put at risk. And in the worst cases, people die.

The fire at the Lakanal House refurbishment in 2009 killed six people, including three children. The Grenfell Tower tragedy in 2017, while a fire in an occupied building, exposed catastrophic failures in building safety culture that have reshaped how the industry thinks about fire risk at every stage, including during construction. Smaller site fires happen regularly and rarely make the news, but they destroy livelihoods and delay completions.

Fire safety on construction sites requires specific planning, and it's legally enforceable.

The Legal Framework

Several pieces of legislation govern fire safety on construction sites:

Regulatory Reform (Fire Safety) Order 2005

The RR(FS)O 2005 applies to all workplaces, including construction sites. It requires the "responsible person" (typically the principal contractor) to carry out a fire risk assessment and implement appropriate fire safety measures.

CDM 2015

The Construction (Design and Management) Regulations 2015 require the principal contractor to plan, manage, and monitor construction work to ensure it is carried out safely. This includes managing fire risk. Regulation 30 specifically addresses fire detection and fire-fighting on construction sites.

Joint Code of Practice

The Joint Code of Practice on the Protection from Fire of Construction Sites and Buildings Undergoing Renovation (often called the JCoP or the "Fire Prevention on Construction Sites" guide) is the industry standard. While not legislation itself, it is widely referenced by insurers, the HSE, and fire authorities as the benchmark for good practice.

Your insurer will almost certainly require compliance with the JCoP as a condition of cover. Failing to follow it could void your site insurance.

Fire Risk Assessment

Every construction site needs a fire risk assessment that is specific to that site. A generic template pulled from another project won't cut it.

Your fire risk assessment should identify:

• Sources of ignition: hot works, temporary electrics, smoking, plant and equipment, arson
• Sources of fuel: timber, insulation materials, packaging, waste, flammable liquids and gases, LPG cylinders
• People at risk: workers, visitors, members of the public near the site boundary
• Existing control measures: what's already in place to prevent fire and protect people
• Additional measures needed: what gaps exist and how you'll close them

The fire risk assessment must be reviewed regularly: at each new phase of work, after any significant change to site layout or activities, and after any fire-related incident or near miss.

Key Fire Safety Measures

Hot Works Permits

Hot works, meaning cutting, welding, grinding, soldering, or any process that generates sparks or flame, are the single biggest cause of construction site fires.

A hot works permit system is essential:

• A written permit issued before any hot works begin
• The work area inspected and combustibles removed or protected
• A fire watcher present during hot works and for a minimum of 60 minutes after work stops (the JCoP recommends this, and many insurers mandate it)
• Fire extinguisher immediately available at the work point
• The permit closed out and signed off at the end of the shift

The fire watcher role is not a box-ticking exercise. The watcher must remain in the area after the work is complete, actively checking for smouldering materials, hot embers, and signs of fire spread. Many construction site fires start hours after hot works have finished, when everyone has gone home.

Flammable Materials Storage

• Flammable liquids (solvents, adhesives, fuels) stored in dedicated, ventilated stores away from the building and ignition sources
• LPG cylinders stored upright in a ventilated, fenced compound at least 3 metres from buildings and site boundaries
• Quantities on site kept to the minimum needed for immediate use
• All containers properly labelled and stored in bunded areas where appropriate

Temporary Fire Detection

Occupied buildings have permanent fire detection systems. Construction sites usually don't — but that doesn't mean you can ignore detection.

• Temporary fire alarm systems should be installed as early as practical, especially in multi-storey buildings
• Where a permanent system is being installed, commission it as early as possible, even if the building isn't complete
• Portable fire detection units (battery-powered smoke/heat detectors with sounders) are available for areas not yet covered by a wired system

Means of Escape

Construction sites change constantly, which makes escape routes unreliable unless they're actively managed.

• Escape routes must be clearly signed and kept clear of obstructions at all times
• Where permanent stairways aren't yet available, temporary stairways or ladders must provide alternative escape
• Escape routes should be reviewed at every phase change — what worked last month might be blocked by new works this month
• Emergency lighting in enclosed areas where natural light is insufficient

Fire Extinguishers

• Extinguishers placed at each hot works location, at each floor level, and near flammable storage areas
• The right type for the risk — water for general combustibles, CO2 or dry powder near electrical equipment, foam for flammable liquids
• Monthly visual checks and annual servicing by a competent person
• Workers trained in basic extinguisher use (pull pin, aim, squeeze, sweep)

Waste Management and Housekeeping

This is where many sites fall down. Construction waste — timber offcuts, packaging, insulation, pallets — is fuel. The more it accumulates, the greater the fire load.

• Waste should be cleared from work areas at least daily, more often during high-risk activities
• Skips should not be positioned against the building — arson is a real and common risk, especially on sites adjacent to public areas
• Combustible waste must not block escape routes, fire assembly points, or access for emergency vehicles
• A clean site is a safer site. If your housekeeping is poor, your fire risk is elevated regardless of what your risk assessment says

Tracking fire safety documentation, hot works permits, and inspection records across a busy site generates a lot of paperwork. A tool like the ComplianceVault readiness checker helps you organise fire safety evidence alongside your other compliance records, so you can demonstrate compliance quickly during insurer audits or HSE inspections.

Emergency Plans and Assembly Points

Your site emergency plan must cover:

• How the alarm is raised (type of alarm, who raises it, how it's communicated across a noisy construction site)
• Fire assembly point(s): located away from the building, away from site traffic routes, and clearly marked. Construction site assembly points are different from those in occupied buildings because the site layout changes frequently
• Roll call procedures — how you verify that everyone is accounted for. This relies on accurate sign-in/sign-out records from the site induction process
• Who calls the fire service and provides access
• Site plan showing fire points, hydrants, extinguisher locations, and assembly areas — updated as the site changes

Who Is Responsible?

Fire safety responsibility on a construction site falls on several duty holders:

• Principal contractor: overall responsibility for fire safety management under CDM 2015 and RR(FS)O 2005
• Individual contractors: each contractor must manage fire risks arising from their own work (especially hot works, flammable materials, temporary electrics)
• Fire wardens: designated individuals trained to assist with evacuation, use extinguishers, and coordinate the emergency response
• All workers: everyone on site has a duty to follow fire safety procedures, report hazards, and not create unnecessary fire risks

Key References

• Regulatory Reform (Fire Safety) Order 2005 (RR(FS)O 2005)
• CDM 2015 — Regulation 30 (fire detection and fire-fighting)
• Joint Code of Practice on the Protection from Fire of Construction Sites and Buildings Undergoing Renovation (JCoP)
• HSE guidance HSG168 — Fire Safety in Construction
• BS 5588 and BS 9999 — Fire safety codes (for the permanent building design)

Summary

• Construction sites face elevated fire risk from hot works, temporary electrics, flammable materials, and poor housekeeping. The JCoP is the industry benchmark your insurer will expect you to follow
• Hot works permits with a dedicated fire watcher (remaining for at least 60 minutes after work stops) are the single most important control measure
• Fire risk assessments must be site-specific and reviewed at every phase change, not written once and filed away
• Escape routes, fire detection, and assembly points must be actively managed as the site layout changes throughout the project
• Every contractor on site shares responsibility for fire safety, with the principal contractor holding overall accountability under CDM 2015 and the Fire Safety Order