Smoke Alarm Installation London — £180 Per Point, BS 5839-6 Certified

Because "from £X" pricing only ever ends one way — a higher number on the day. A smoke alarm install is a point-count job: every detector is a defined unit of work (base, head, interconnect, commissioning entry). £180 covers all of that per point, so the survey schedule is the quote. A 4-point install is £720. A 7-point install is £1,260. No surprises.

Grade D alarms are mains-powered with a sealed battery backup — required in every English rental since the 2015 Regulations took force. Grade F alarms are battery-only and remain legal for owner-occupiers but are no longer accepted by London councils for HMO licensing or rental compliance audits. We default to Grade D on every rental install.

BS 5839-6 categorises domestic detection by coverage. LD1 covers every room except bathrooms and toilets — the highest standard, used in high-risk properties. LD2 covers escape routes plus high-risk rooms (kitchen, living room, principal bedroom) — the practical London HMO baseline. LD3 covers escape routes only and is the legal minimum for owner-occupied homes built since 1992. We install LD2 on every rental unless an FRA specifies LD1.

Yes. BS 5839-6 and every London HMO licensing scheme require interlinked detection so that an alarm triggered in one room sounds in every room — critical when occupants are sleeping behind closed bedroom doors. We interlink hard-wired where possible and use the Aico Ei3000RF radio module where chasing the walls is impractical.

If you own and occupy the property, a 10-year sealed-battery Grade F alarm is legal and cheap. If you rent it out, you must install Grade D (mains-powered with battery backup). For HMOs and licensed lets the answer is always Grade D interlinked. If you are unsure, our survey confirms in writing which grade applies.

The sealed lithium backup is rated for the full ten-year life of the alarm head. When the head reaches end-of-life the entire unit is replaced — there is no battery to change manually. This eliminates the classic "3am chirp" failure that drives most call-outs.

BS 5839-6 specifies central ceiling positions in escape routes (hallway, landing) and in any room considered a sleeping risk. Alarms should be at least 300mm from any wall or light fitting, never above doors or extract fans, and never in kitchens (use heat alarms instead). Our survey marks every point against the standard.

The Renters Rights Act 2026 abolished Section 21 in May 2026 and made fire-safety failure the single largest tribunal fine vector for landlords. A missing or expired smoke alarm is now an automatic enforcement trigger. Councils audit at first complaint, fines start at £5,000 per breach and reach £30,000 for repeat offences. Per-point installation is the cheapest insurance available.

For a standard three-bedroom, two-storey HMO we typically schedule six points — a smoke alarm in each bedroom, one on the hall, one on the landing, a heat alarm in the kitchen and a CO alarm wherever the boiler sits. Total cost £1,030 covering everything. A four-bed adds a bedroom alarm; a basement adds a landing alarm.

Every device is tested at commissioning. We then recommend a weekly user test (the button test — anyone can do it) and an annual engineer test that we can carry out on a fixed-price contract. Annual inspection is £85 covering all alarms in a single visit.