Holiday Let Smoke Alarm and CO Alarm Requirements UK

A single smoke alarm in the hallway does not meet UK fire safety requirements for a holiday let. The alarm standards for paying guest accommodation are higher than those for owner-occupied homes or long-term tenancies — and for good reason. Guests are asleep in unfamiliar surroundings, often at unusual hours, and will not recognise the layout or know how to exit the building if woken by a fire. This guide explains exactly what is legally required for smoke and CO alarms in a UK holiday let in 2026.

The Legal Framework

Two pieces of legislation govern alarm requirements for holiday lets:

• The Smoke and Carbon Monoxide Alarm (England) Regulations 2015(as amended 2022) — requires a smoke alarm on every storey of a dwelling and a CO alarm in rooms with solid fuel appliances.
• The Regulatory Reform (Fire Safety) Order 2005 (RRO 2005) — requires the responsible person of paying guest accommodation to maintain adequate fire detection and warning. HMSO guidance (“Making your small paying guest accommodation safe from fire,” January 2025) sets out what adequate means in practice.

The 2015 Regulations are a floor, not a ceiling. HMSO guidance for paying guest accommodation requires significantly more than the minimum domestic standard.

Smoke Alarm: Required Grade and Coverage

Grade required: D1 — mains-powered with a tamper-proof battery backup. Battery-only alarms (Grade F1 or F2) are not compliant for holiday lets in long-term use. HMSO guidance explicitly states that Grade F2 (disposable battery, non-interlinked) is not sufficient for paying guest accommodation; Grade F1 (sealed long-life battery) may be acceptable as a short-term interim measure only.

Coverage required:

• Every storey of the property
• Every guest bedroom — this is the critical requirement most hosts miss
• Hallways, landings, and main living areas
• Lounges and dining rooms

Bedroom coverage is specifically required because the sleeping risk in holiday lets is higher than in a property where occupants know the building. A fire starting in a ground-floor kitchen must wake guests sleeping in upstairs bedrooms before smoke reaches them — which requires detection in those bedrooms, not just in the hallway.

Heat Alarms: Kitchen and Utility Rooms

The kitchen must have a heat alarm, not a smoke alarm. Smoke alarms in kitchens produce frequent false alarms from cooking, which causes guests to remove or disable batteries — leaving the property unprotected. A heat alarm (BS 5446-2 rated) detects the heat signature of a real fire without false-tripping from toast or steam. Heat alarms are also required in utility rooms and laundry areas.

Interlink: The Requirement Most Hosts Miss

All smoke, heat, and CO alarms must be interlinked — either by hardwiring or by wireless radio frequency protocol. When one alarm activates, all alarms in the property must sound simultaneously. This is not optional for holiday lets: HMSO guidance states that interlink is required because a standalone alarm detecting a fire in the kitchen will not wake guests asleep in an upstairs bedroom with the door closed.

Modern mains-powered (Grade D1) alarms from major manufacturers support wireless interlink as standard. Replacing a standalone alarm system with an interlinked one typically costs £150–£400 depending on property size.

Carbon Monoxide Alarms: What Is Required

Since 1 October 2022, the Smoke and CO Alarm (Amendment) Regulations 2022 require a CO alarm in every room containing a fixed combustion appliance. For holiday lets, this means:

• Every room with a gas boiler or gas fire
• Every room with a wood-burning stove or log burner
• Every room with an open fireplace
• Every room with an oil-fired heater or AGA
• Every room with an LPG appliance

Gas cookers are specifically exempt, but all other fixed combustion appliances require a CO alarm in the same room. Select the correct exception: if no fixed combustion appliances are present in a given room, no CO alarm is required in that room.

Testing Requirements for Holiday Lets

Unlike long-term tenancies (which require alarm testing at the start of a tenancy and then monthly for commercial premises), holiday let alarms should be testedat every changeover — before each new guest arrival. This is the standard set by HMSO guidance for paying guest accommodation. A pre-arrival checklist that includes an alarm test is the simplest way to document compliance.

Document Compliance in Your Fire Risk Assessment

FRASafe’s holiday let fire risk assessment asks about alarm grade, coverage, interlink status, CO alarm placement, and testing frequency — generating a written record of compliance that you can produce to a fire inspector, insurer, or the England STL registration scheme from April 2026. Assessments start at £45.