HMO fire detection sits at a higher tier than ordinary domestic. The Management of HMO Regulations 2006 require the manager to maintain fire-detection in working order; the local licensing scheme attaches a BS 5839-6 grade and category to that duty. In every London borough we work — Newham, Hackney, Waltham Forest, Tower Hamlets, Croydon — the baseline for a licensed HMO is Grade D LD2: mains-powered detection with battery backup, interlinked across the property, covering escape routes plus high-risk rooms.
LD2 in an HMO means at minimum: a smoke alarm in every bedroom, a smoke alarm on every storey of the common escape route, a heat alarm in every shared kitchen, and a CO alarm wherever the boiler or any other fixed combustion appliance sits. Sometimes more — large HMOs (5+ storeys, 6+ occupants in some boroughs) tip into Grade A, where an addressable panel with manual call points replaces the simpler Grade D scheme.
Electrician London designs and installs HMO detection at £180 per point. A typical 4-bedroom two-storey HMO runs 6-7 points (£1,080-£1,260) and finishes in a single day. The commissioning paperwork is formatted for borough licensing teams — no re-issue requests, no licence delay. We are also Council of Mortgage Lenders-friendly, so the install does not blow up at remortgage.
Why Electrician London
BS 5839-6 LD2 to council baseline
Schedule meets Newham, Hackney, Waltham Forest, Tower Hamlets, Croydon and every other London borough licensing standard. Council-ready certificate.
Interlinked Grade D mandatory
Mains-powered with battery backup, wired or radio-linked across the property. Trigger in one room sounds every alarm — the HMO standard.
Heat alarm in shared kitchen
Kitchens get Aico Ei3014 heat alarms instead of smoke — no cooking false alarms, full BS 5839-6 LD2 compliance.
Grade A upgrade path
Large HMOs (5+ storeys, 6+ occupants in some boroughs) tip into Grade A addressable panel. We design and quote both grades from a single survey.
HMO smoke alarm pricing
Per-point pricing for Grade D LD2. Grade A addressable panel systems quoted separately.
HMO smoke alarm point
Grade D mains + battery
£180
HMO heat alarm (kitchen)
Aico Ei3014 BS 5839-6
£170
HMO CO alarm (boiler/combustion)
EN 50291-1 sealed-battery or mains
£140
Typical 4-bed HMO full LD2
6-7 points including heat + CO
£1,080-£1,260
Large HMO Grade A panel system
Addressable panel, zoned detection, MCPs
From £2,950
What's included for HMO licensing
- BS 5839-6 LD2 design schedule
- Grade D mains + battery alarms in every bedroom
- Escape route coverage (hall + landing)
- Heat alarm in shared kitchen
- CO alarm at boiler / combustion appliance
- Interlinked (wired or radio)
- BS 5839-6 commissioning certificate
- Council licensing paperwork pack
Frequently asked questions
Why does every HMO need interlinked alarms?
Because HMO occupants sleep behind closed bedroom doors and often do not know each other. An alarm in the kitchen has to wake the occupant on the top floor — that only works with interlinked detection. BS 5839-6 codifies this and every London licensing borough audits to it.
What is LD2 in practice for a 4-bed HMO?
A smoke alarm in each of the four bedrooms, a smoke alarm in the hall, a smoke alarm on the upstairs landing, a heat alarm in the shared kitchen, and a CO alarm at the boiler. Total seven points, all interlinked, total cost around £1,260. Single day install for a typical Victorian conversion.
When does an HMO need Grade A instead of Grade D?
Borough thresholds vary, but the common triggers are five-or-more storeys, six-or-more occupants, or a Section 257 HMO (converted block of flats). Grade A means an addressable control panel, zoned detection, sounders and manual call points at exits. Cost steps up to £2,950+ but compliance is unambiguous for large or complex layouts.
Does my mandatory licensed HMO require a Grade A system?
Usually no — Grade D LD2 interlinked is the standard mandatory-licensing baseline. Selective licensing schemes (Newham, Tower Hamlets and others) and additional-licensing borough schemes typically also accept Grade D. Grade A becomes mandatory at the five-storey threshold or where the FRA explicitly requires it.
What documentation does the council want?
BS 5839-6 commissioning certificate (proves install design + test), Minor Works Electrical Installation Certificate (proves the mains wiring is BS 7671 compliant), and the system logbook (records weekly user tests and annual engineer tests). We hand over all three on the day.
Does the FRA dictate the alarm grade?
Yes — the fire risk assessment for the common parts of the HMO names the grade and category (LD2 or LD1) the detection system must meet. The installer designs to the FRA. If you do not have an FRA, our partner team can carry one out alongside the install — required for HMO licensing in every borough.
Can I keep the existing battery alarms during transition?
Briefly, during the install only. Battery-only alarms do not meet the LD2 standard in any London borough and will fail licensing. We remove them on commissioning day once the new Grade D system is signed off, so the property is never without working detection.
Do you also install AOV / smoke vent?
Yes — common in HMOs converted from period houses with a single stairwell. The alarm system can drive an AOV actuator on activation. We coordinate the design with our AOV team and certify both systems together. See our AOV testing service.
How long does the install take in an occupied HMO?
A four-bedroom Victorian HMO takes one engineer one full day if we use radio-linked detection. Hard-wired adds half a day for cable routing. Tenants only need to grant room access for ten minutes per bedroom — we schedule around their availability.
Do you handle the EICR and EPC together?
Yes — most landlords come to us for the bundle. HMO EICR, EPC, fire risk assessment and smoke alarm install are all required annually or at licence renewal. Single-visit bundles save time and money. See our HMO compliance pages.
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