Gas Cooker Carbon Monoxide Alarm Exemption for Landlords

The gas cooker exemption is one of the most misunderstood provisions in the Smoke and Carbon Monoxide Alarm (England) Regulations 2015. Some landlords read it as "kitchens don't need CO alarms." Others assume it was removed by the 2022 amendments. Neither is correct. The exemption is narrow, specific, and easy to misapply.

What the Exemption Actually Says

Regulation 4(1)(a)(ii) requires a CO alarm in any room used as living accommodation that contains a fixed combustion appliance. The regulation then explicitly excludes gas cookers from the definition of "fixed combustion appliance" for this purpose.

In practical terms: if the only fuel-burning appliance in a room is a gas cooker — a freestanding or built-in gas hob and oven — you are not legally required to fit a CO alarm in that room under these regulations.

When the Exemption Doesn't Help

The exemption disappears the moment another combustion appliance enters the picture. Common scenarios where landlords incorrectly rely on the gas cooker exemption:

Kitchen with a gas cooker and a wall-mounted combi boiler. The boiler is a fixed combustion appliance. A CO alarm is required in this room because of the boiler, regardless of the gas cooker.

Kitchen with a gas cooker and a back-boiler behind a gas fire in an adjoining room. If the boiler is technically in the kitchen space (even behind a shared wall with an internal opening), a CO alarm is required.

Open-plan kitchen-living area with a gas cooker and a wood-burning stove. The wood burner triggers the CO alarm requirement for that space. The gas cooker exemption is irrelevant when any other combustion appliance is present.

Kitchen with a gas cooker above an underfloor gas heater. The heater is a fixed combustion appliance. CO alarm required.

Why the Exemption Exists

Gas cookers do produce carbon monoxide during normal operation, particularly during prolonged use or when burners are poorly adjusted. The legislative reasoning for exempting them was pragmatic rather than safety-based — the government judged that mandating CO alarms in every kitchen with a gas cooker would impose costs disproportionate to the risk, given that cookers are attended appliances with visible flames. BS EN 50292 still recommends fitting a CO alarm in any room containing a gas cooker, and many fire safety professionals treat it as best practice.

Best Practice vs Legal Minimum

The gap between the legal minimum and sensible practice is worth noting. Carbon monoxide is colourless and odourless. A gas cooker with a partially blocked burner, poor ventilation, or a slowly failing thermocouple can generate dangerous CO levels. Fitting a CO alarm in the kitchen even when it's legally optional costs under £20 and could prevent a fatality.

For landlords who want to go beyond the statutory baseline, a combination smoke/CO alarm on the kitchen ceiling (or a standalone CO alarm at high level, away from cooking steam) provides meaningful additional protection without significant expense.

Recording the Exemption

If a property has a kitchen with only a gas cooker and no other combustion appliance, note this explicitly in your alarm compliance records. A written entry stating "kitchen — gas cooker only, no CO alarm required under Regulation 4(1)(a)(ii) exemption" is far better than a blank space that could be interpreted as a missed alarm.

The alarm compliance guide includes a room-by-room mapping template where each space's combustion appliances are logged against the alarm requirement — including a specific field for documenting the gas cooker exemption so your records show a deliberate decision rather than an oversight.

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