A common question from new HMO landlords is whether battery alarms will do, or whether HMO smoke alarms have to be mains-wired and linked together. For most HMOs the honest answer is that mains-powered, interlinked detection is what the guidance expects, and battery-only alarms will not pass muster. If you let a shared house anywhere in Hampshire, here is the detail.
Why interlinking matters in an HMO
In a family home, anyone awake will usually hear an alarm anywhere in the house. An HMO is different: tenants sleep behind closed doors, may have headphones in, and may not know who else is in. If a fire starts in the kitchen and only the kitchen alarm sounds, someone asleep upstairs gets no warning. Interlinking means one trigger sounds them all, which is the whole point.
Mains power with battery backup
The detection standard for HMOs, set by the LACORS guidance and BS 5839-6, points to mains-powered alarms with a battery backup so the system keeps working in a power cut. This is the Grade D arrangement described in our guide to alarm grade and category. Larger or higher-risk HMOs step up to a Grade A panel system.
Where the alarms go
Coverage follows the LD category from your fire risk assessment. As a rule, you will have detection on every storey, in circulation spaces that form the escape route, and in higher-risk rooms. Kitchens take heat detectors rather than smoke alarms, because cooking fumes would set off a smoke sensor constantly and tempt someone to disable it.
How this sits with the alarm regulations
The Smoke and Carbon Monoxide Alarm (England) Regulations require at least one smoke alarm on each storey of a rented home and a carbon monoxide alarm in any room with a fixed combustion appliance, excluding gas cookers. For licensed HMOs the licence conditions and LACORS generally demand more than this baseline, so treat the regulations as a floor, not the target. Our guide to gas safety covers the CO side.
Testing and maintenance
Detection only protects tenants if it works. The Management Regulations require alarms to be kept in good working order, which means regular testing and servicing by a competent person, commonly around every six months, with records kept for the council. Encourage tenants to report faults and never to remove or cover a detector.
Common detection failings councils find
The faults that crop up at inspection are predictable: battery-only alarms where a mains-linked system is needed, units that are not actually interlinked so only the local alarm sounds, detectors removed or covered by tenants, and no servicing records to show the system is maintained. Any one of these can undermine the protection your fire risk assessment assumed was in place.
The fix is partly technical and partly management: install the right system, then test and service it on a schedule and keep the evidence. Encourage tenants to report faults and explain why a disabled detector puts everyone at risk. Hampshire and Isle of Wight Fire and Rescue Service treats working detection as a basic expectation in shared housing, and a maintained, certificated system is straightforward to demonstrate.
It is worth covering the alarm system briefly when a new tenant moves in: how it sounds, what to do when it activates, and why it must never be covered or removed. A two-minute induction does more for real safety than another notice on the wall, and it sets the tone for how the house treats fire safety.
Get your detection compliant
Not sure your alarm system meets the HMO standard? For advice tailored to your property from a competent professional, speak to Jamie at ESI: Fire Safety on 01276 300 351.
