Fire Alarm Cost Calculator
What you need is set by the building and who sleeps in it, not by preference. Pick the grade that applies and this prices the devices, the interlink and the certification around it.
Open the calculator →Price a fire alarm system in 30 seconds
4 steps. Property type, device count, wiring and region.
How this calculator works
The grade sets the system and the first four devices; every device after that is added at the per-device rate for that grade, because a Grade A call point costs more than a Grade D smoke alarm.
Radio interlink usually comes out cheaper overall in a finished house: the hardware costs more, and it saves chasing walls, patching and redecorating.
Not included: the annual service and certificate, which is £90–£300 a year on a rented or commercial building and is what an inspector asks to see.
Typical fire alarm installation costs (2026)
| System | Typical 2026 cost | Notes |
|---|---|---|
| 3–4 interlinked alarms (Grade D) | £250–£600 | Owner-occupied homes |
| Per additional alarm | £70–£140 | Smoke, heat or CO |
| Landlord / HMO system (Grade D1) | £400–£900 | Rented houses, small HMOs |
| Grade A panel system, small | £1,200–£2,500 | Larger HMOs, small commercial |
| Grade A panel system, larger | £2,500–£4,000+ | Offices, retail, multi-storey |
| Annual service & certificate | £90–£300/yr | Rented and commercial |
Figures match the table on our fire alarm installation cost page.
Fire alarm calculator — FAQs
£250–£600 for a typical three or four alarm house, mains powered with battery backup.
In Scotland, yes — every home since February 2022. Elsewhere the duty falls hardest on landlords and HMOs, and new build and major refurbishment are covered by Building Regulations.
Grade D is interlinked alarms with their own power. Grade A is a system with a control panel, separate detectors, sounders and manual call points.
Battery radio-interlinked alarms, yes. Mains-powered alarms are fixed electrical work and fall under Part P in England and Wales.
Related cost guides
- Fire alarm cost 2026 — Grades, categories and full prices
- Burglar alarm cost — Intruder alarms priced by system
- EICR certificates — The other certificate landlords need
Get 3 Free Fire Alarm Quotes
60 seconds · No spam · No obligation