Security · Updated September 2026
Fire Alarm Installation Cost UK 2026
Interlinked mains-powered alarms for a house run £250–£600 fitted, a landlord or HMO system £400–£900, and a panel-based commercial system £1,200–£4,000+. What you need is set by the building and who sleeps in it, not by preference.
Fire alarm installation cost by system type — 2026
Domestic systems are priced by the number of alarms; commercial ones by devices on a panel. Scotland has required interlinked alarms in every home since 2022, which is why the domestic figures start where they do.
| System | Typical fitted cost | What it is | Typically required for |
|---|---|---|---|
| 3–4 interlinked alarms (Grade D) | £250–£600 | Mains with battery backup, all sound together | Owner-occupied homes |
| Per additional alarm | £70–£140 | Smoke, heat or CO | Extra rooms and hallways |
| Landlord / HMO system (Grade D1) | £400–£900 | Sealed 10-year backup, certificated | Rented houses and small HMOs |
| Grade A panel system, small | £1,200–£2,500 | Control panel, sounders, call points | Larger HMOs, small commercial |
| Grade A panel system, larger | £2,500–£4,000+ | Zoned, more devices, log book | Offices, retail, multi-storey |
| Annual service & certificate | £90–£300 / year | Test, log and certify | Any system on a rented or commercial building |
Indicative 2026 UK installed prices, compiled from published installer pricing. BestBuilders has no quote history in this category yet, so treat these as a budgeting guide and confirm against three written quotes.
What changes the cost
| Cost factor | Typical impact | Why it matters |
|---|---|---|
| Number of devices | +£70–£140 each | Every detector, sounder and call point is hardware plus a cable run |
| Wired or radio-interlinked | −£100–£400 | Radio interlink avoids chasing walls in a finished house, at a higher hardware cost |
| Grade and category | +£300–£2,000 | A panel system is a different job from interlinked alarms, not an upgrade of one |
| Making good | +£100–£500 | Chasing, patching and redecorating where cable had to be buried |
| Certification and log book | +£80–£250 | Rented and commercial buildings need the paperwork, not just the kit |
| Occupied building | +£150–£600 | Working around tenants or trading hours costs more than an empty shell |
Fire alarm installation cost by UK region — 2026
Modelled from regional labour rates rather than measured in this category - the hardware costs the same everywhere, the fitting does not.
| Region | Typical installed cost | vs UK average |
|---|---|---|
| London | £320–£1,150 | +25–30% |
| South East | £300–£1,060 | +15–20% |
| South West & East | £270–£960 | +5–10% |
| Midlands | £250–£900 | Baseline |
| North of England | £240–£860 | −5% |
| Wales & Scotland | £240–£860 | −5% to baseline |
Getting it priced properly
1. Find out which grade applies
Owner-occupied, rented, HMO and commercial are four different requirements. Ask the installer to name the grade and category in writing.
2. Check the local rules
Scotland has required interlinked alarms in every home since 2022, and HMO licensing conditions differ by council. The building decides, not the budget.
3. Budget for the service, not just the install
A rented or commercial system needs testing and a certificate every year. That is £90–£300 a year and it is what an inspector asks to see.
Fire alarm brands compared: Aico, FireAngel, Kidde, Honeywell, Hispec and Nest
For a house the choice is between mains-wired interlinked alarms and sealed ten-year battery units. For a rented property or an HMO the grade is set by regulation, so ask the installer to name it before comparing prices.
| Brand | Known for | Ranges you will be quoted | Typical alarm price | Worth knowing |
|---|---|---|---|---|
| Aico | The UK professional standard for interlinked alarms | 3000 Series, RadioLINK+ | £35–£90 | RadioLINK+ interlinks by radio, avoiding chasing walls in a finished house |
| FireAngel | Widely used by landlords and social housing | Pro Connected, FP2620 | £25–£70 | Connected range reports status, which suits managed portfolios |
| Google Nest | Smart smoke and CO with phone alerts | Nest Protect | £100–£140 | Good for owner-occupiers; usually not accepted alone for HMO compliance |
| Hispec | Value end of the mains-powered market | HSSA range | £18–£45 | Common on new-build and budget landlord specifications |
| Honeywell | Commercial panels as well as domestic detectors | Notifier, Gent, Morley-IAS | £60–£250 per device | Where a Grade A panel system is required rather than interlinked alarms |
| Kidde | Familiar retail brand with a full sealed range | Firex, Slick, 10-year sealed | £20–£60 | Sealed ten-year units avoid annual battery changes |
Prices above are for the alarm only — fitting is separate and is priced in the table further up this page. Brands are listed alphabetically, not ranked: BestBuilders does not sell or endorse any of them.
Fire alarm cost by system type
Domestic interlinked alarms and a Grade A panel system are different jobs, not upgrades of one.
Fire alarm installation — frequently asked questions
£250–£600 for a typical three or four alarm house, mains powered with battery backup. Radio-interlinked units cost more to buy and much less to install in a finished house.
In Scotland, yes — every home has needed interlinked alarms since February 2022. Elsewhere in the UK the duty falls hardest on landlords and HMOs, and new build and major refurbishment are covered by Building Regulations. Check with your council if you let the property.
Grade D is interlinked alarms that each carry their own power — mains with a backup, or a sealed ten-year battery. Grade A is a full installed system with a central control panel, separate detectors, sounders and manual call points wired back to it. The other half of the spec is the category: LD1 covers every room, LD2 the risk rooms and escape routes, LD3 the escape routes only, and that is what sets how many detectors you need. Owner-occupied and small rented homes are usually Grade D; larger HMOs and commercial buildings move up to Grade A. Ask the installer to name both the grade and the category in writing before you compare quotes.
You need to be able to show the system suits the property and has been looked after. For a rented house that usually means a Grade D system installed to BS 5839-6, the installer's commissioning certificate, and a record that the alarms are being tested — the landlord checks them at the start of each tenancy, the tenant weekly after that. For a panel-based Grade A system it's an annual service by a competent engineer plus a log book kept on site. Selective and HMO licensing schemes are where this actually gets inspected, and a missing log book is usually the first thing a council officer picks up on.
Sealed battery radio-interlinked alarms, yes — they clip to a base and talk to each other over radio, so there's no wiring and nothing to notify. Mains-powered alarms are different: they're fixed electrical work, and in England and Wales that falls under Part P of the Building Regulations. You can wire them in your own home, but the work has to be notified to Building Control — roughly £150–£250 as a standalone notification — unless whoever does it is on a competent-person scheme and can self-certify. In a rental, don't chance it: use a registered electrician who installs and certifies the job, because that certificate is the part that protects you.
Related security guides
Bells-only, monitored and smart systems priced.
When a camera or bell box needs consent.
Fire alarm installation — guides and detail
The detail behind the number: what changes the price, the planning position, and how to check a quote before you accept it.
Registered members: Security & Alarms
One business offering security & alarms has a public profile with BestBuilders. Each listing is a business that registered with us directly; the details shown are the ones it declared at registration, and a Companies House number appears only where one was given.
All registered trades · Recent projects · Run a security & alarms business? Add your free profile
Reviewed by the BestBuilders editorial team · Last updated: 2 September 2026 · Next scheduled review: December 2026 · See our editorial standards.