Smoke Alarm Regulations: What the Law Says in England
In England, smoke alarm regulations depend on who you are. Landlords must have a working smoke alarm on every storey used as living accommodation and a carbon monoxide alarm in any room with a fixed combustion appliance (gas cookers excepted), and must repair or replace faulty alarms once told. Anyone building a new home, a loft conversion or certain extensions must meet Building Regulations, which expect mains-powered alarms with a battery backup. Owner-occupiers living in an existing home have no legal duty, only strong advice.
These rules are for England. Wales and Scotland have their own (Scotland, for example, requires interlinked alarms in every home, owner-occupied or rented), which we do not cover here.
Smoke alarm regulations for landlords
The Smoke and Carbon Monoxide Alarm (England) Regulations 2015 were extended by the Smoke and Carbon Monoxide Alarm (Amendment) Regulations 2022, in force from 1 October 2022. According to the government's guidance for landlords and tenants, every relevant landlord, private or social, must:
Make sure at least one smoke alarm is fitted on each storey of the home where there is a room used as living accommodation.
Make sure a carbon monoxide alarm is fitted in any room used as living accommodation that contains a fixed combustion appliance, excluding gas cookers.
Repair or replace smoke and CO alarms once they are told the alarms are faulty.
On top of that, the landlord must check each alarm is in working order on the day a new tenancy begins. It makes sense to be able to prove it, and the guidance suggests one way: have the tenant sign the inventory on day one to confirm the alarms were tested.
A few details that catch people out:
"Living accommodation" includes bathrooms and toilets, and a hall or landing counts as a room. In the government's view, a mezzanine is not a storey.
A purely decorative fireplace that does not work is not a fixed combustion appliance. A log burner, a gas or oil boiler, or a working coal fire is.
Heat detectors are not a substitute for smoke alarms.
The regulations do not say alarms must be mains powered. The government guidance recommends alarms compliant with BS 5839-6 and, where battery alarms are used, sealed-for-life batteries rather than replaceable ones. For fire alarm systems in rented homes, we normally recommend mains alarms with sealed backup batteries, so tenants cannot remove them.
Some tenancies are excluded, including accommodation shared with the landlord or the landlord's family, long leases, student halls, hotels and refuges, care homes, hospitals and hospices.
Carbon monoxide alarm regulations
The CO alarm rule was the bigger change in 2022. Under the original 2015 regulations, CO alarms were only required in rooms with a solid fuel appliance. Now any fixed appliance that burns fuel to make heat counts: gas or oil boilers, log burners, open fires.
The regulations do not dictate where the CO alarm goes. The government guidance says that, in general, it should be at head height on a wall or shelf, about 1 to 3 metres from the appliance, and that alarms should comply with BS EN 50291. Always follow the manufacturer's instructions as well.
What happens if a landlord does not comply?
Local councils enforce the rules. If a landlord fails to comply, the council can serve a remedial notice, and failing to comply with that notice can lead to a fine of up to £5,000. The guidance is clear the fine applies per breach, not per landlord or property.
HMO fire alarm requirements
Houses in multiple occupation work slightly differently. The 2015 regulations apply directly to unlicensed HMOs. Licensed HMOs are exempt from the main parts only because the same requirements are written into HMO licence conditions under the Housing Act 2004.
In practice an HMO usually needs more than one alarm per floor. Workplace fire safety law also covers the shared parts of a multi-occupied building, and for those common areas the landlord, freeholder or managing agent is the "responsible person" who must carry out a fire risk assessment and maintain the fire safety measures. That risk assessment, and the council's licence conditions, normally set the grade and category of alarm system. Government guidance on sleeping accommodation suggests interlinked mains alarms (Grade D, LD2 or LD3) as a starting point for smaller HMOs of up to two storeys, and a panel-based Grade A system in the common parts of bigger ones.
If you are converting a house to an HMO, talk to the council's private housing team before work starts so the alarm design matches what they will ask for.
Building Regulations: new builds, extensions and loft conversions
Building work is covered by Part B of the Building Regulations and its guidance, Approved Document B. For dwellings it says:
Every new dwelling should have a fire detection and alarm system to at least Grade D2, Category LD3 of BS 5839-6. That means mains-powered alarms with a standby supply, sited in the circulation spaces (hall and landings).
Smoke alarms should be mains operated and meet BS EN 14604. Heat alarms should be mains operated and meet BS 5446-2. Both need a standby supply such as a battery or capacitor.
Larger houses (more than one storey, at least one storey over 200m²) need a Grade A system: LD3 for two storeys, LD2 for three or more.
Where an extension or alteration adds a new habitable room above or below the ground storey, or a new ground floor habitable room without a final exit, alarms should be provided in the circulation spaces to the same standard.
Each flat in a new block should have its own alarms to the same standard.
A loft conversion is the classic trigger. The alarms become part of the building control sign-off, and Approved Document B says a design, installation and commissioning certificate should be provided, so make sure your installer includes one.
What about owner-occupiers?
In England, no regulation makes a homeowner fit or upgrade alarms in an existing house unless they are doing building work. The government's Fire Kills campaign still recommends at least one working alarm on every level, testing them at least monthly, alarms in bedrooms and other rooms with fire hazards, and says a heat alarm can go in the kitchen. Its guidance is that ten-year sealed battery alarms are the best choice for most people fitting their own, and mains alarms need an electrician.
Smoke alarm regulations, answered
Do the rules apply to businesses?
Workplaces fall under fire safety law rather than the smoke alarm regulations. The responsible person must carry out a fire risk assessment, and that decides whether you need a fire detection and alarm system. Most commercial systems follow BS 5839-1.
Who changes the batteries in a rented home?
The government guidance says tenants should replace the batteries if an alarm stops working during the tenancy, and report it to the landlord if that does not fix it or they cannot do it themselves. Sealed ten-year alarms avoid the question entirely.
Does the landlord have to test alarms every month?
No. The legal duty is to check them on the first day of each new tenancy and to act on reports of faults. The guidance says landlords should consider showing tenants how, and how often, to test them.
What if a tenant will not let us in to fit alarms?
The guidance says landlords must take all reasonable steps, such as writing to explain the legal requirement and offering a convenient time, and should keep a written record of access attempts. They are not expected to go to court for access.
Getting it right first time
Whether you are a landlord in Telford, converting a loft in Shifnal or running an HMO in Wolverhampton, SM Electrical can design and fit alarms that meet the rules and suit the building. If an existing alarm keeps sounding, our guide to a smoke alarm beeping walks through the usual causes, and for a system you cannot silence at night our emergency electrician team can help. To arrange an installation or a check, contact us.
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