What fire alarm system an HMO needs, Grade A vs Grade D, testing rules and the certificates councils ask for.
The short answer
Most HMOs need an interlinked, mains-powered fire alarm system designed to BS 5839-6. The size of the property decides how much it needs. Smaller shared houses can usually use a Grade D system of linked mains alarms. Larger and taller HMOs, and most bedsit-type HMOs, need a Grade A system with a control panel. Your local council has the final say.
A house in multiple occupation (HMO) is a property let to three or more people from more than one household who share facilities such as a kitchen or bathroom. Because tenants live independently and a fire can start in any room, HMOs need better fire detection than an ordinary family home. Councils enforce this through HMO licensing and the Housing Health and Safety Rating System (HHSRS).
Grades and categories in plain English
Typical requirements by type of HMO
Most councils base their standards on the national LACORS fire safety guidance for housing. Typical requirements look like this. Always check your own council’s HMO standards, because they vary.
Shared houses (one tenancy, shared like a family home)
Bedsit-type HMOs (individual lettings, often with cooking in rooms)
Kitchens and any room with cooking facilities should have heat detection rather than smoke detection, to avoid false alarms from cooking.
Testing, servicing and paperwork
Emergency lighting is also often required in larger HMOs, especially where escape routes have no natural light. See our emergency lighting testing guide.
Other fire safety rules for landlords
Fire alarms are only one part of HMO fire safety. Your council will also look at fire doors, protected escape routes, fire blankets in kitchens, and carbon monoxide alarms where there is a fixed combustion appliance. In England, all private landlords must also follow the smoke and carbon monoxide alarm regulations. Where an HMO has common parts, the responsible person must also carry out a fire risk assessment under the Regulatory Reform (Fire Safety) Order 2005.
Common problems we find in HMOs
Salts Fire & Security is BAFE SP203-1 registered and works with landlords and letting agents across Bradford, Leeds (see our Leeds HMO guide), Huddersfield, Manchester, Nottingham and beyond. We can survey your property against your council’s HMO standards, install or upgrade the system and give you the certificates you need. See our fire alarm service and fire alarm categories guide.
Common questions
What fire alarm does an HMO need?
Most HMOs need an interlinked, mains-powered system to BS 5839-6. Smaller shared houses usually need Grade D (linked mains alarms). Larger HMOs and most bedsit-type HMOs need Grade A (a panel system). Your council’s HMO standards set the exact requirement.
Do HMO smoke alarms have to be interlinked?
Yes. HMO fire alarms should be interlinked so that a fire detected anywhere sounds the alarm throughout the property.
Can I use battery smoke alarms in an HMO?
Generally no. Councils normally require mains-powered alarms with a standby battery (Grade D) or a panel system (Grade A). Battery-only alarms are not usually accepted for HMO licensing.
How often should an HMO fire alarm be serviced?
Grade A panel systems should be serviced by a competent person every six months. Grade D alarms should be tested at least monthly, and both should be recorded in a logbook.
What certificates do I need for my HMO licence?
Councils usually ask for the fire alarm installation and commissioning certificate and recent service records, plus emergency lighting certificates where fitted.
Do you work with letting agents and portfolio landlords?
Yes. We look after single properties and larger portfolios, with planned servicing and certificates sent after every visit.
Last reviewed 04/11/2026 by the Salts Fire & Security team, Baildon. This is general guidance; your fire risk assessment and the full standard take priority.
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