There are two layers of alarm rules for rented property in England, and confusing them is one of the most common mistakes we see. One layer applies to every landlord. The other applies on top if your property is an HMO. Here’s both, in plain English.
Layer one: the rules for every rented home
The Smoke and Carbon Monoxide Alarm (England) Regulations (2015, tightened in 2022) apply to virtually all private rented property, from a single flat to a family house:
- At least one smoke alarm on every storey where there’s a room used as living accommodation. That includes a converted loft bedroom.
- A carbon monoxide alarm in any room with a fixed combustion appliance: a gas boiler, gas fire, log burner and so on. (Gas cookers are the exception; they don’t trigger the requirement.)
- Repair or replace promptly when told an alarm is faulty. Since 2022 this is an explicit duty: if a tenant reports a dead alarm, the landlord has to sort it, not the tenant.
- Alarms must be shown to be working at the start of each new tenancy. Sensible landlords record this on the check-in inventory, because it’s the record that protects you later.
The regulations don’t dictate a brand or power type for ordinary lets, but battery-only alarms have an obvious weakness: batteries get removed. Which brings us to layer two.
Layer two: what HMOs need on top
If your property is an HMO, the baseline above is nowhere near enough. HMO licence conditions and the housing standards councils apply almost always require:
- Interlinked, mains-powered alarms rather than standalone battery units, so that when one alarm triggers, they all sound.
- The system to match a specified grade and category under BS 5839-6, which depends on the size, height and layout of the property. We’ve written a full guide to alarm grades if you want the detail.
- Heat detection (not smoke) in kitchens, because smoke detectors in kitchens get silenced or removed by tenants after the third burnt toast incident.
- Weekly testing, recorded in a logbook. An immaculate system with no test records still fails a licensing inspection.
The practical upshot: a landlord who fits a few battery alarms and considers the job done is compliant for a single family let and non-compliant for an HMO.
The questions we hear most
Do the alarms in an HMO have to be interlinked? In practice, yes. Councils expect interlinked mains systems in licensed HMOs, and BS 5839-6 points the same way. Standalone alarms in an HMO are a licensing failure waiting to happen.
Who does the weekly test? Whoever you like: you, your agent, or us as part of a scheduled testing round. The rule is that it happens and gets recorded. The logbook is what the inspector reads.
How long do alarms last? Detectors have a stated lifespan, typically around ten years. Past that, sensitivity drifts and false alarms rise. The replacement date is printed on the unit; it’s worth checking during any visit.
Not sure where your property stands?
We install and service fire alarm systems of all grades and types across Hounslow and West London, and we’ll tell you honestly whether your current setup meets the standard your property actually needs. Request a free quote and we’ll take a look.