A commercial kitchen fire can extend beyond the kitchen itself.

If a fryer overheats and ignites cooking oil, flames can reach the extraction canopy. If grease builds up in the ductwork, the fire can spread unpredictably through the building, turning a contained incident into a much more serious hazard.

Fire crews throughout the country have responded to many restaurant fires where grease or oil ignited and propagated through extraction systems, damaging ducts from the kitchens to the roof.

In buildings with flats, offices, or hotel rooms above, the risks and potential damage increase significantly. Consequently, for restaurants, hotels, takeaways, and other hospitality venues, assessing fire risk must consider not only the cooking area but also the space above the cooker.

Why Extraction Ducting Can Become a Fire Risk

Commercial extraction systems remove heat, smoke, steam, and airborne grease from busy kitchens.

Over time, some grease can settle inside canopies, filters, and ductwork.

If these areas aren’t cleaned properly, deposits can build up. Because they are often hidden, it’s easy to overlook them.

This increases the risk of a fire starting below. Heat or flames may ignite the grease inside the extraction system, and once ignited, the fire can travel along the ducting, spreading to areas far from the original source.

This can make fires harder to control and allow smoke and heat to cause more extensive damage.

Fryers Are Another Area to Watch

Commercial fryers operate under high heat daily.

Overheated cooking oil may ignite, and electrical or mechanical issues can cause hazards.

Oil ignitions in commercial fryers that spread into extraction ducts highlight the importance of regular maintenance and thorough cleaning of fryers, hobs, extractor hoods, and surrounding areas.

Busy kitchens often accumulate grease quickly, which is normal, but neglecting this buildup greatly raises the risk of fires.

Smoke Can Travel Further Than the Flames

Even if fire damage is limited, smoke often spreads beyond those areas.

Extraction systems, open service routes, and connected spaces can enable smoke and soot to circulate throughout a building.

That can affect:

• Dining areas
• Bars
• Stock rooms
• Offices
• Hotel rooms
• Flats above restaurants
• Electrical equipment
• Furniture and soft furnishings

While the kitchen may have been the starting point of the fire, most cleaning and restoration work may be needed elsewhere.

Smoke residue can linger on surfaces and equipment even after the fire is extinguished. Soot can stain finishes, create persistent odours, and corrode delicate materials.

The Commercial Impact Can Be Significant

For a hospitality business, a fire poses immediate safety concerns and significant operational challenges.

Closure might lead to cancelled reservations, lost customers, spoiled inventory, staff disruptions, and revenue loss.

Recovery then becomes critical.

Questions arise:

• Can part of the restaurant reopen?
• Does the entire premises need to close?
• Is the equipment still safe to use?
• Has smoke contamination reached customer areas?
• Does the extraction system require replacement?
• Has firefighting water caused additional damage?

These factors determine how quickly the business can resume operations. That’s why early assessment and a structured restoration plan are essential. The goal is to minimise secondary damage, preserve what’s salvageable, and establish the most straightforward path to reopening.

How Can Businesses Reduce Commercial Kitchen Fire Risk?

Prevention begins with routine maintenance, which must be carried out consistently.

We advise regularly cleaning extraction ducting and ensuring hobs, cooker hoods, and extractor fans remain free of grease and fat.

Businesses should also:

• Maintain cooking equipment according to manufacturer guidance
• Have electrical systems checked regularly
• Review fire risk assessments
• Train staff on kitchen fire procedures
• Keep appropriate fire suppression equipment available
• Make sure fire detection and alarm systems work correctly
• Review cleaning schedules for canopies, filters and ductwork

Automatic fire suppression systems can also help contain a kitchen fire earlier.

In busy kitchens, integrate these inspections into regular property management instead of considering them only after an incident.

What Happens After a Commercial Kitchen Fire?

After the fire service confirms the property is safe, the emphasis shifts to recovery, making speed essential.

Smoke and soot can continue damaging surfaces even after the fire is out, and firefighting water can cause additional moisture problems.

Assess equipment and stock, as areas that seem unaffected may still harbour smoke residue or odour.

Professional fire restoration may involve soot removal, smoke cleaning, odour treatment, contents cleaning, decontamination, and specialist drying if water damage is present.

The sequence of tasks is also vital; cleaning an area before removing damaged ductwork or equipment might cause soot to settle back onto treated surfaces, leading to unnecessary rework.

How ServiceMaster Restore Can Help

For a restaurant or hospitality business, the main goal after a fire isn’t just restoring the property’s look but minimising disruption, preventing further damage, and ensuring a safe return to operation.

ServiceMaster Restore offers fire and smoke damage restoration across the UK, assessing damage, identifying key areas, and creating recovery plans. This includes specialised cleaning, soot and smoke removal, odour control, content restoration, and drying.

Early action protects stock, equipment, and building materials, potentially avoiding replacements, reducing claim costs, and speeding recovery.

For hospitality businesses, each lost day affects revenue. We coordinate restorations to reduce downtime and restore safety quickly, working with insurers, brokers, and loss adjusters with transparent updates.

After the crisis, analysing smoke patterns helps improve future emergency response plans.

If your restaurant, hotel, takeaway or commercial kitchen has suffered fire, smoke or water damage, call ServiceMaster Restore on 0800 021 3970 or find your nearest ServiceMaster Restore business.