Fire safety on a construction site means preventing fires from starting, limiting how far they can spread, and making sure everyone can get out quickly if one does start. The person responsible for a workplace must assess the fire risk, put sensible precautions in place and plan for emergencies. As a worker, your job is to follow the site fire rules, keep the site tidy and know what to do when the alarm sounds.
Key takeaways
- The responsible person for a workplace must carry out a fire risk assessment and keep it under review.
- They must also tell people about the risks, put fire safety measures in place and maintain them, and plan for emergencies.
- People on site must be given fire safety information and instruction, which usually starts at the site induction.
- Hot work, flammable materials and waste that builds up are among the most common causes of fire on sites.
- Escape routes must stay clear, and you should know where the alarm points, extinguishers and assembly point are.
- If there is a fire and you are not trained or it is not safe, raise the alarm and leave rather than tackling it.
Who is responsible for fire safety
The GOV.UK guidance on workplace fire safety says that the person who is responsible for fire safety in a workplace is called the responsible person. That can be an employer, the owner of the premises, a landlord or an occupier, depending on who has control. On a construction site, the principal contractor and the individual contractors each hold part of the responsibility for the areas and work they control.
According to the GOV.UK guidance, the responsible person must:
- carry out a fire risk assessment of the premises and review it regularly
- tell employees, or their representatives, about the risks that have been identified
- put in place, and maintain, adequate and appropriate fire safety measures
- plan for an emergency
- provide information, instruction and training to staff about the risks and the precautions
The GOV.UK guidance covers England and Wales; Scotland and Northern Ireland have separate rules, which the page links to. Check your employer's procedures for the rules that apply where you work. A site may also be made up of different parts at different stages of work. The fire plan for a half-built structure, a site office and a welfare cabin will not look the same, and it has to change as the work changes.
Common fire risks on construction sites
Sites have many ignition sources and a lot of fuel in one place, often in a space that is changing every week. The HSE construction safety topics page is a useful place to check what else the regulator covers for sites. These are the fire risks you are most likely to meet.
Hot work
Cutting, welding, grinding, soldering and using a blowtorch all create heat, flames or sparks. Many sites control hot work with a permit to work. Never carry out hot work without the permit if your site uses them.
Flammable and combustible materials
Fuels, gases, solvents, paints, adhesives and some insulation materials can burn quickly or give off dangerous vapour. Store them in the designated place, with lids on and containers in good condition. Keep fuel gases and oxygen cylinders separated, store cylinders as your site rules direct, and do not leave more flammable material in a work area than the job needs.
Waste and storage
Packaging, offcuts, timber, pallets, dust and rubbish are all fuel. When waste builds up near work areas, stairs or exits, a small fire can spread fast and block the way out. Clear waste regularly into the skips provided, keep skips where the site plan says and keep stored materials tidy and away from heat sources. Housekeeping is fire prevention.
Electrical equipment and heating
Damaged cables, overloaded sockets, temporary lighting too close to combustible material and portable heaters left unattended all cause fires. Report damaged equipment, switch off and unplug items when finished, and never cover heaters or leave them next to stored materials.
Smoking
Smoking rules exist to cut fire risk as well as protect health. Smoke only in the areas your site allows, and put cigarettes out fully in the containers provided.
Planning for escape
Preventing fires is only half the job. The duty to plan for an emergency means that everyone on site must be able to leave safely and quickly, and that the emergency services can reach the site.
A good escape plan on a construction site normally includes:
- clearly marked escape routes that are kept free of materials, waste and equipment
- a way to raise the alarm that everyone can hear or see, and that is tested
- fire points with suitable extinguishers, and signs that show where they are
- a named assembly point away from the building, with a way to check that everyone is accounted for
- arrangements for people who might need extra help to leave
- a route and access for fire and rescue vehicles
Escape routes on a live site change as work progresses. Stairs may be incomplete, doors may be missing and scaffolding may be in the way. That is why the plan is explained at induction and updated when conditions change. Listen to briefings and notices about new routes, and ask if you are unsure which way to go. See site induction explained for what a good induction should cover.
Fire safety checklist for your shift
- Know the sound of the alarm, the escape routes from where you are working and the assembly point.
- Find the nearest fire point and extinguisher before you start work.
- Do not start hot work without the permit and checks your site requires.
- Keep flammable materials in the designated store and return them when finished.
- Clear waste as you go and never block a route, door or fire point.
- Report damaged electrical equipment and any signs of overheating, smoke or a burning smell.
- Keep smoking to the permitted areas and extinguish materials fully.
- Do not tamper with alarms, detectors or extinguishers.
- Report any fire, however small, even if you put it out.
What to do if there is a fire
Follow the procedure explained at your induction. In general, raise the alarm first, leave by the nearest safe route and go to the assembly point. Do not stop to collect belongings, and do not use lifts if your site rules say not to. Only tackle a very small fire if you are trained to use the extinguisher, it is safe to do so, and you have a clear way out behind you. Otherwise, leave it to the emergency services and tell the person in charge where the fire is and whether anyone could still be inside.
Do not go back into the area until you have been told it is safe.
Practice check
These two questions are original practice items written for this site. They are not official test questions and give no official result. This site is independent and is not affiliated with CSCS or CITB.
Question 1. You hear the fire alarm while working in a partly finished building. What should you do first?
- A. Finish the task you are working on.
- B. Leave by the nearest safe escape route and go to the assembly point.
- C. Look for the cause of the alarm.
- D. Wait for someone to confirm it is a real fire.
Answer: B. Treat every alarm as real. Leave by the nearest safe route and go to the assembly point so that you can be accounted for.
Question 2. Which of these is the best way to reduce the fire risk from waste on a site?
- A. Stack offcuts and packaging against a wall until the end of the week.
- B. Leave waste next to stairs so it is easy to find.
- C. Clear waste regularly into the skips provided and keep routes clear.
- D. Burn waste in a bin at the end of each day.
Answer: C. Waste is fuel. Regular clearing into the provided skips cuts the fuel available and keeps escape routes open.
You can try more in our free practice questions.
FAQ
Who is responsible for fire safety on a construction site?
The responsible person is the one who has control of the premises or work. GOV.UK says this can be an employer, owner, landlord or occupier. On sites, several contractors share the duty for the areas and work they control, while workers must follow the rules and report hazards.
What does a fire risk assessment involve?
It means identifying what could start a fire, what could burn, who could be harmed and how people would escape. The responsible person must carry it out, tell people about the risks and review it regularly. The result should be sensible precautions and an emergency plan.
Do I need a permit for hot work?
Many sites require a permit to work for hot work such as welding, cutting and grinding. Follow your site rules and ask your supervisor if you are not sure. Do not begin without the checks the permit requires.
Should I use a fire extinguisher if there is a fire?
Only if you are trained, the fire is very small, it is safe and you have a clear way out. Otherwise raise the alarm and leave. Your induction should explain what your site expects.
Sources
Independent guide, not affiliated with, authorised by, approved by or endorsed by CSCS or CITB. Last updated 2026-10-08.