Flames from the Deep Fryer: How to Prevent Restaurant Kitchen Fires

Why Deep Fryer Fires Are the Biggest Threat in Your Restaurant Kitchen

A commercial kitchen is one of the most fire-prone environments in any building. Open flames, superheated oils, electrical equipment running for hours on end, and the relentless pressure of a busy service — it all adds up to a genuinely dangerous combination.

Understanding how to prevent restaurant kitchen fires, particularly flames from the deep fryer, is not just good practice — it is a legal obligation under UK fire safety law. Whether you run a small café or a high-volume restaurant, the risks are real and the consequences severe. Not just for your property, but for every person inside it.

Here is what every restaurant owner and kitchen manager needs to know.

Flames from the Deep Fryer: Why This Is the Highest-Risk Point in Your Kitchen

Commercial kitchens account for a significant proportion of fire incidents across the UK hospitality sector. The combination of cooking fats, high temperatures, and continuous equipment use creates conditions where a fire can escalate within seconds.

Deep fat fryers are among the most common culprits. When oil overheats or spills onto an open flame, the result can be catastrophic. But fryers are not the only hazard — grease build-up in extraction systems, faulty electrics, and poor staff training all contribute to kitchen fires that could have been prevented.

The practical steps below cover the measures that make the real difference between a near-miss and a devastating incident.

Build a Genuine Kitchen Fire Safety Culture

Fire safety starts with people, not equipment. If your kitchen team does not take fire risks seriously, no amount of suppression systems will fully protect you.

Building a genuine safety culture means making fire awareness part of everyday kitchen operations — not just an annual box-ticking exercise. Staff should feel empowered to raise concerns, report hazards, and follow procedures without being pressured to cut corners during a busy service.

Hold Regular Fire Drills

Fire drills should be conducted at realistic intervals, not just when it is convenient. Every member of staff — including part-time and agency workers — needs to know the evacuation procedure, the location of fire exits, and who is responsible for fire safety on each shift.

If your staffing rotates across shifts, designate a named fire safety lead for every shift. That person should be the first point of contact in an emergency and should hold a higher level of fire safety training than the rest of the team.

Make Training Mandatory and Ongoing

One-off training sessions are not enough. Refresher training — particularly around grease fire handling, extinguisher use, and emergency shut-off procedures — should be built into your annual training calendar.

Any cook working with open flames or deep fat fryers should receive specific training on the hazards involved. This includes understanding why water must never be used on a grease fire — a mistake that can cause a fireball and result in severe injury.

Deep Fat Fryer Safety: Preventing Flames from the Deep Fryer

When it comes to flames from the deep fryer and how to prevent restaurant kitchen fires, the fryer itself deserves special attention. It operates at extreme temperatures, contains large volumes of flammable oil, and sits in a busy, fast-paced environment where accidents happen easily.

Change the Oil Regularly

Used cooking oil degrades over time and has a lower flash point than fresh oil, meaning it ignites more easily. In a standard restaurant, deep fryer oil should be changed at least once a day. In high-volume operations, this may need to happen several times during a single service.

Grease containers and collection trays must also be emptied regularly. Overflow grease near a heat source is a direct fire risk — do not let it accumulate, particularly during busy periods when it is easiest to overlook.

Keep the Fryer Away from Open Flames

If your deep fat fryer is positioned next to open flame cooking equipment, you have a serious layout problem. Hot oil splashing onto an open flame — or radiant heat from a flame igniting oil vapours — can start a fire instantly.

The fryer should be kept at least 40 cm away from any open flame appliance. If your kitchen layout does not allow this, install a vertical metal divider between the fryer and any open flame equipment. It is a straightforward and cost-effective solution that significantly reduces the risk of cross-ignition.

Install and Maintain an Automatic Fire Suppression System

An automatic fire suppression system is not optional in a commercial kitchen — it is an essential layer of protection. These systems detect a fire and respond within seconds, typically by releasing a suppression agent directly over the cooking equipment and simultaneously cutting the fuel or electrical supply.

That automatic shut-off function is critical. A fire fed by a live gas line or powered fryer will escalate far more quickly than one where the fuel source has been cut. The suppression system buys time for evacuation and prevents a localised fire from spreading through the kitchen.

The system must be inspected and serviced by a qualified professional at least twice a year. Grease, dust, and general kitchen grime can interfere with nozzles and sensors, potentially rendering the system ineffective at the moment you need it most. Keep a maintenance log and ensure inspections are carried out on schedule.

Choosing and Using the Right Fire Extinguishers

Not all fire extinguishers are suitable for kitchen fires. Using the wrong type on a grease or oil fire can make things dramatically worse.

Every commercial kitchen should have the following extinguisher types available:

Class F (wet chemical) extinguisher: Specifically designed for fires involving cooking oils and fats. This is the primary extinguisher type for any kitchen with a deep fat fryer or range cooking.
CO₂ extinguisher: Suitable for electrical fires and should be positioned near electrical panels and equipment.
ABC dry powder extinguisher: Effective on fires involving wood, paper, and some electrical equipment — useful as a secondary option but not suitable for cooking oil fires.

All staff should be trained on which extinguisher to use in which scenario. This training should be practical, not just theoretical — staff need to have physically operated an extinguisher at least once.

Electrical Inspections: A Non-Negotiable Requirement

Electrical faults are a leading cause of commercial kitchen fires. The combination of heat, moisture, grease, and constant use puts significant stress on wiring, sockets, and appliances.

Schedule regular inspections by a qualified electrician. They will check for:

Exposed or frayed wiring
Damaged or cracked switch plates, which can collect grease and cause short-circuits
Overloaded circuits
Faulty connections in high-use appliances
Equipment drawing more current than it should

Cracked switch plates and socket covers might seem like a minor issue, but grease and debris accumulating inside them is a genuine ignition risk. Replace them immediately when damaged.

Ensure all staff know how to isolate the electrical supply in an emergency. The main isolation switch should be clearly labelled and accessible — not buried behind equipment or locked away.

Extraction System Cleaning: The Hidden Fire Risk

Grease does not just accumulate in fryers and containers — it builds up inside extraction hoods, ductwork, and exhaust systems. This layer of grease is highly flammable and, if ignited, can carry a fire through the entire extraction system and into the roof space or adjacent areas of the building.

If your kitchen uses charcoal or wood-burning equipment, the risk is compounded. Creosote — a byproduct of burning wood — deposits inside exhaust systems and is extremely flammable.

For all commercial kitchens, extraction system cleaning should be carried out by a specialist contractor at intervals determined by the volume and type of cooking. High-volume or heavy-frying kitchens may need quarterly cleaning. Document every cleaning visit and keep the records — your insurer and fire authority may ask to see them.

Kitchen Layout and Its Direct Impact on Fire Risk

Kitchen design has a direct impact on fire risk. Many older commercial kitchens were laid out without fire safety as a primary consideration, resulting in arrangements where high-risk appliances sit dangerously close together.

If you are planning a refurbishment or setting up a new site, involve a fire safety professional in the design process from the outset. Key layout principles include:

Maintaining safe distances between open flame equipment and oil-based cooking appliances
Ensuring extraction systems are positioned directly above all high-heat cooking equipment
Providing clear, unobstructed access to fire exits and suppression controls
Positioning fire extinguishers and fire blankets where they can be reached quickly without crossing the cooking line

Even in an existing kitchen, small changes to layout can meaningfully reduce risk. A vertical divider between a fryer and a gas range is a simple retrofit that could prevent a serious incident.

Carry Out a Professional Fire Risk Assessment

Under the Regulatory Reform (Fire Safety) Order, every non-domestic premises in England and Wales — including restaurants — must have a suitable and sufficient fire risk assessment carried out and regularly reviewed. This is not optional, and failing to comply can result in prohibition notices, fines, or prosecution.

A professional fire risk assessment goes far beyond checking that you have extinguishers on the wall. It examines your entire premises — the kitchen, dining area, storage, electrical systems, and means of escape — and identifies specific risks that need to be addressed.

The assessment should be reviewed whenever there is a significant change to your premises, your occupancy, or your cooking processes. It should also be reviewed following any fire incident, however minor.

The Link Between Asbestos and Fire Safety in Older Buildings

If your restaurant operates from an older building — particularly one constructed before 2000 — there is a realistic possibility that asbestos-containing materials are present somewhere in the structure. This matters for fire safety because asbestos can be disturbed during fire damage, renovation work, or even routine maintenance, releasing dangerous fibres into the air.

Before any refurbishment work, and as part of your overall building compliance picture, a survey should be carried out by a qualified surveyor. A standard management survey will identify the location and condition of any asbestos-containing materials within your premises, giving you the information you need to manage them safely during ongoing operations.

If you are planning significant structural work — including fire reinstatement following an incident — a demolition survey will be required before any intrusive work begins. This type of survey is more thorough and is designed to locate all asbestos-containing materials that could be disturbed during major works.

Asbestos and fire safety are more closely linked than many building managers realise. A fire that damages walls, ceilings, or ductwork in a building containing asbestos can create a secondary hazard that is every bit as dangerous as the fire itself.

Asbestos Surveys for Restaurant Operators Across the UK

If you operate in the capital, an asbestos survey London can be arranged quickly and will give you a clear picture of what is present and where across your premises.

For restaurant operators in the North West, an asbestos survey Manchester covers the full range of survey types required under the Control of Asbestos Regulations — from management surveys through to refurbishment and demolition surveys.

If your premises are in the Midlands, an asbestos survey Birmingham will ensure you meet your legal duty to manage asbestos in your building and keep your staff, customers, and contractors safe.

A Practical Fire Prevention Checklist for Restaurant Kitchens

Use this checklist as a starting point for your kitchen fire safety review. It does not replace a professional fire risk assessment, but it will help you identify obvious gaps quickly.

Deep fat fryer oil is changed at least daily — more frequently in high-volume operations
Grease collection trays and containers are emptied regularly throughout service
The fryer is positioned at least 40 cm from any open flame equipment, or a metal divider is in place
An automatic fire suppression system is installed, operational, and serviced twice yearly
Class F wet chemical extinguishers are in place and all staff know how to use them
Extraction hoods and ductwork are cleaned by a specialist contractor at appropriate intervals
Electrical equipment is inspected regularly by a qualified electrician
All staff have received fire safety training, including practical extinguisher use
A named fire safety lead is designated for every shift
A current, professionally conducted fire risk assessment is in place and under review
If the building was constructed before 2000, an asbestos management survey has been carried out

What to Do Immediately After a Kitchen Fire

Even a small fire that is quickly extinguished needs to be treated as a serious event. The steps you take in the hours and days afterwards matter both for safety and for legal compliance.

Immediately after any kitchen fire:

Evacuate the premises and ensure all persons are accounted for
Contact the fire service even if the fire appears to be out — they will confirm the area is safe
Do not re-enter the kitchen until it has been declared safe by the fire service or a competent professional
Photograph the damage before any clean-up or repair work begins
Notify your insurer as soon as possible
Review your fire risk assessment in light of the incident

If the fire has caused structural damage to an older building, commission an asbestos survey before any reinstatement work begins. Disturbed asbestos fibres released during fire damage or subsequent repair work represent a serious health risk to your contractors and staff.

Keep a written record of the incident, the response, and any corrective actions taken. This documentation will be important if your premises are inspected by the fire authority following the incident.

Frequently Asked Questions

What is the most common cause of restaurant kitchen fires in the UK?

Deep fat fryers and accumulated grease in extraction systems are among the most frequent causes of commercial kitchen fires. Overheated or degraded cooking oil, combined with inadequate cleaning of extraction ductwork, creates conditions where a fire can start and spread rapidly. Electrical faults are also a significant contributing factor in many kitchen fire incidents.

What type of fire extinguisher should a restaurant kitchen have?

Every commercial kitchen should have at least one Class F wet chemical extinguisher, which is specifically designed for fires involving cooking oils and fats. CO₂ extinguishers should also be available for electrical fires. Water and foam extinguishers must never be used on cooking oil fires — doing so can cause a violent reaction that makes the situation significantly worse.

How often should a commercial kitchen extraction system be cleaned?

The frequency depends on the volume and type of cooking carried out. High-volume kitchens or those doing heavy frying may require extraction cleaning every three months. Lower-volume operations may be able to extend this to every six or twelve months. A specialist contractor should assess the appropriate cleaning schedule for your specific kitchen and provide documentation of every visit.

Is a fire risk assessment legally required for a restaurant?

Yes. Under the Regulatory Reform (Fire Safety) Order, all non-domestic premises in England and Wales — including restaurants, cafés, and takeaways — must have a suitable and sufficient fire risk assessment in place. The assessment must be carried out by a competent person and reviewed regularly, particularly after any significant change to the premises or following a fire incident.

Why does asbestos matter when dealing with a kitchen fire in an older building?

Buildings constructed before 2000 may contain asbestos-containing materials in walls, ceilings, pipe lagging, floor tiles, or ductwork. A fire — and the subsequent repair and reinstatement work — can disturb these materials and release dangerous fibres. Before any post-fire repair work begins in an older building, an asbestos survey should be carried out to identify any materials that could be disturbed during the works.

Speak to Supernova Asbestos Surveys

Supernova Asbestos Surveys has completed over 50,000 surveys across the UK, helping restaurant operators, property managers, and building owners meet their legal obligations and keep their premises safe.

Whether you need a management survey for ongoing compliance, a demolition or refurbishment survey ahead of building works, or a fire risk assessment for your restaurant premises, our team of qualified surveyors is ready to help.

Call us on 020 4586 0680 or visit asbestos-surveys.org.uk to arrange a survey or find out more about how we can support your fire safety and asbestos compliance requirements.