Smoke Alarm Installation London — BS 5839, Grade D LD2 & HMO Compliance
Hardwired interlinked smoke and heat alarms installed across London. BS 5839-6 compliant for landlord and HMO use, mains-powered with battery backup, Grade D LD2 or Grade A LD1 systems. NICEIC certified, BAFE registered. Required for all new builds, refurbs, HMO licensing, and any rented property. Call 07407 627542 or 07500 721453.
Smoke alarm installation pricing — London 2026
| Property / system | Price (inc VAT) |
|---|---|
| 1-bed flat — 2 hardwired interlinked (Grade D LD3) | £260 |
| 2-bed flat — 3 hardwired interlinked (Grade D LD2) | £340 |
| 3-bed terrace — 4 alarms + heat detector | £420 |
| 4-bed house — 5-6 alarms full Grade D LD2 | £540 |
| Small HMO (3-6 tenants) — Grade D LD2 | £640–£840 |
| Large HMO (7+) — Grade A LD1 panel | £1,200–£3,500 |
| Annual test cert (existing system) | £140 + £20/detector over 6 |
| Battery-only to hardwired upgrade (per alarm) | £85–£120 |
All installations include mains wiring, interlink hardwired or radio-linked, battery backup, BS 5839 certification, and 6 years’ NICEIC warranty.
Grade A, D, and battery-only explained
- Battery-only — DIY-install only, not rental-compliant, fine for owner-occupier.
- Grade D LD3 — mains+battery, interlinked. Minimum for single-let rentals under 2022 regs.
- Grade D LD2 — same plus detectors in every bedroom. Required for small HMOs.
- Grade A LD1 — full panel system with call points. Required for larger HMOs (7+ tenants) or 3+ storey HMOs.
Confused? Send us your property type, bedrooms, storeys — we’ll confirm the grade. Most small London HMOs need Grade D LD2.
The 2022 Smoke & CO Alarm Regulations
Since 1 October 2022, every private rented home in England (including HMOs) must:
- Fir a smoke alarm on every storey used as living accommodation
- Fit a CO alarm in any room with a fixed combustion appliance (excluding gas cookers)
- Test all alarms working on tenancy start day
- Repair/replace faulty alarm promptly
Fines up to £5,000.
Where alarms go (BS 5839-6)
- Every escape route (hallways, stairwells, landings)
- Every bedroom (LD2 and above)
- Every room (LD1 for larger HMOs)
- Heat detectors in kitchens/garages
- CO alarms in rooms with combustion appliances
What’s included
- Site survey, cable route planning
- New dedicated cable, chased and made-good
- Detectors mounted properly
- Interlink test
- Battery backup test
- BS 5839 test certificate + re-test reminder
- Walk-through test/silence demo
- Logbook (HMO installs)
- 6 years’ NICEIC + manufacturer warranty
Detector brands
- Aico Ei3000 — UK market leader, recommended
- FireAngel — solid mid-range
- Kidde — reliable, retrofit-friendly
- Hispec — UK-made panel systems
- Apollo — premium Grade A
FAQ
Self-install? Battery-only yes (not rental); hardwired no — Part P notifiable.
Lifespan? Detector 10 years. We replace at end-of-life £85 each.
Power cut? Battery backup keeps alarms working 24 hours.
Heat vs smoke? Heat in kitchens/garages. Smoke elsewhere.
Radio-linked? Yes — Aico and FireAngel. Saves chasing walls.
Book your smoke alarm install
Call 07407 627542 or 07500 721453. Send property type, bedrooms, storeys, HMO status, any existing alarms. Fixed-price quote within the hour.
Related: HMO Compliance Bundle · Landlord EICR · EICR Cost · All areas