England, Fire Safety, 2026

Smoke Alarm Rules for Landlords UK: What You Must Do

A complete guide for UK landlords on smoke alarm legal requirements in 2026: the Smoke and Carbon Monoxide Alarm (Amendment) Regulations 2022, per-floor requirements, CO alarm obligations, tenant repair requests, and HMO fire detection grades.

8 min readUpdated 31 May 2026Last reviewed: 31 May 2026 by Richard Wood, FounderSmoke AlarmFire SafetyCarbon MonoxideSmoke and CO Alarm Regulations

Written and reviewed byRichard Wood· Founder, LetSafe UKLast reviewed: 31 May 2026

Periodic Assured Tenancy Agreement£29

The legal requirement, Smoke and Carbon Monoxide Alarm (Amendment) Regulations 2022

The Smoke and Carbon Monoxide Alarm (England) Regulations 2015, as amended by the Smoke and Carbon Monoxide Alarm (Amendment) Regulations 2022 (S.I. 2022/547), set out the minimum alarm requirements for all private rented properties in England. The 2022 amendment came into force on 1 October 2022 and significantly expanded the carbon monoxide alarm obligation.

The requirements apply to all private sector landlords in England, including HMO landlords (subject to additional HMO-specific obligations, see below), lodger landlords, and holiday let landlords where the property is also used as a private dwelling.

Smoke alarm requirements, detail

Location, every storey used as living accommodation: At least one working smoke alarm must be fitted on every storey of the property that is used as living accommodation. 'Living accommodation' includes bedrooms, living rooms, kitchens, bathrooms, and landings on upper floors
Ceiling-mounted: Smoke alarms must be ceiling-mounted (not wall-mounted) for effective coverage. Position away from kitchens and bathrooms to reduce false alarms, a hallway ceiling or landing ceiling is the standard position
Working at start of tenancy: The landlord must ensure alarms are in working order at the start of each new tenancy. Test by pressing the test button, record the test date and result in a written property condition report signed by the landlord or agent
Type of alarm: Ionisation alarms (the older technology, detects flaming fires) and optical alarms (detects slow, smouldering fires) are both compliant with the Regulations. Combination alarms are available and provide broader coverage. The Regulations do not specify a technology requirement, any alarm of an appropriate grade for the property type is compliant

Carbon monoxide alarm requirements, detail

Every room with a fixed combustion appliance: A CO alarm must be installed in every room that contains a fixed combustion appliance. This includes gas boilers, gas fires, solid fuel stoves, oil-fired heaters, and open fireplaces where solid fuel is burned
Exemption for gas cookers: A gas cooker alone in a kitchen does not require a CO alarm, cooking appliances are excluded. However, if the kitchen also contains a gas boiler or a gas fire, a CO alarm is required
Electric appliances; no CO alarm required: Electric heaters, electric cookers, and electric boilers do not produce carbon monoxide and do not require a CO alarm
Electrochemical CO sensors: The Regulations do not specify sensor technology but industry best practice is electrochemical CO sensors, which are more accurate and reliable than older electrochemical versions. Ionisation-type CO detectors are not recommended
Battery or mains-powered: Both battery-operated and mains-wired CO alarms with battery backup are compliant. Mains-wired alarms with sealed battery backup are the most reliable installation for the landlord's long-term obligations

Wood-burning stoves and solid fuel fireplaces

If your rental property has a wood-burning stove or an open fireplace used for solid fuel burning, a CO alarm in that room is mandatory. It must be in place before the first tenancy commences in the property. This is a common compliance gap identified in enforcement surveys.

HMO additional fire detection requirements

HMOs (houses in multiple occupation) must meet additional fire detection requirements over and above the standard Smoke and Carbon Monoxide Alarm Regulations. HMO licence conditions typically specify the fire detection grade required based on the HMO category:

Grade D LD2; small HMOs (category 1 to 3, up to 4 occupants): Interlinked mains-powered smoke alarms with battery backup in all habitable rooms and circulation areas, plus heat detector in the kitchen
Grade D LD1 or Grade A; larger HMOs (4+ occupants): Full coverage of every room and circulation space, interlinked, mains-powered with battery backup. Heat detector in kitchen and any room with naked flame appliances
Fire doors: FD30S fire doors (30-minute fire resistance with self-closer and smoke seal) to all bedroom doors and to the kitchen in larger HMOs. Check the HMO licence conditions for the specific requirement for your property
Emergency lighting: Required in circulation areas (hallways, staircases) in HMOs with multiple storeys

Tenant repair requests, landlord obligations

Where a tenant reports a faulty smoke alarm or CO alarm:

Respond to the report promptly in writing, acknowledge receipt and confirm you are arranging repair or replacement
Inspect the alarm to determine whether the fault is a battery issue (tenant's responsibility after start of tenancy) or a unit fault (landlord's responsibility)
Replace faulty units as soon as reasonably practicable. The local authority can serve a remedial notice requiring compliance within 28 days if the landlord does not act
Document the repair; date reported, action taken, new alarm installation date and model. This record is essential for any enforcement action

Combine alarm checks with property inspections

Include smoke alarm and CO alarm testing in every routine property inspection (at least annually, quarterly for HMOs). Date-stamp the test record and include it in the inspection report. This demonstrates ongoing compliance rather than only first-day compliance.

Civil penalties for non-compliance

If a landlord fails to comply with the Smoke and Carbon Monoxide Alarm Regulations, the local authority can serve a remedial notice requiring the deficiency to be remedied within 28 days. If the notice is not complied with, the local authority can:

Arrange for the required work to be done and recover the costs from the landlord, plus
Impose a civil penalty of up to £5,000
Failure to have working alarms is an aggravating factor in any prosecution following a fire or CO incident at the property

Sources

This guide is accurate as at 31 May 2026. It is provided for information purposes only and does not constitute legal advice.

Primary sources

This page is drafted against the legislation below. Always check the current text of the law before acting.

Smoke and Carbon Monoxide Alarm (England) Regulations 2015 (legislation.gov.uk)
HMO licensing (GOV.UK)

Frequently asked questions

How many smoke alarms must I fit in a rental property?+

At least one working smoke alarm on every storey of the property that is used as living accommodation. There is no upper limit, more alarms provide better protection. In practice, a minimum of one on the ground floor (near the kitchen approach but not directly over cooking equipment) and one on each upper floor landing is the standard minimum configuration for a standard house.

Does a gas boiler room require a carbon monoxide alarm?+

Yes. The Smoke and Carbon Monoxide Alarm (Amendment) Regulations 2022 require a CO alarm in every room that contains a fixed combustion appliance. A room housing only a gas boiler is a room containing a fixed combustion appliance, it requires a CO alarm. This includes utility rooms, airing cupboards, and dedicated boiler rooms.

Who is responsible for replacing batteries in a smoke alarm?+

The landlord must ensure alarms are working at the start of each tenancy. After the tenancy commences, the tenant is responsible for replacing batteries in battery-operated alarms (and for testing alarms regularly). The landlord remains responsible for repairing or replacing faulty alarm units, including the base unit where the battery alone will not remedy the fault.

What happens if I don't have smoke alarms in my rental property?+

The local authority can serve a remedial notice requiring the landlord to install compliant alarms within 28 days. If the notice is not complied with, the local authority can arrange for the work to be done and charge the cost to the landlord, plus a civil penalty of up to £5,000. Absence of working alarms is also an aggravating factor in any fire safety enforcement action.

Templates recommended in this guide

Put this guide into practice, get the Periodic Assured Tenancy Agreement from the LetSafe shop, the regulation-current pack that matches this guide.

TenancyLS-E-001

Periodic Assured Tenancy Agreement

The default English tenancy since 1 May 2026. Periodic from day one, with the prescribed written statement of terms built in. Ships with the Form 4A rent-increase notice template and an Information Sheet delivery acknowledgement form so a buying landlord has every Phase-1 compliance document in one pack.

£29

See what’s inside

NoticeLS-E-010

Section 8 Notice Pack (All Grounds)

Every mandatory and discretionary ground on the new 2026 list, pre-labelled with the notice period, arrears threshold, and evidence block.

£19

See what’s inside

Found a gap or disagree with something?

Reply to any LetSafe email or write to richard@letsafeuk.co.uk. We rewrite guides when we get something wrong, the sooner we hear, the sooner we fix it.

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