Fire Alarm Installation Cost: UK System Pricing Guide 2026

• LD3 — Escape route protection — smoke detectors in all circulation spaces forming part of escape routes (hallways, landings, stairwells). This is the minimum acceptable level and provides warning when smoke has reached the escape route. Suitable for existing homes where full coverage is not required by regulation. For a typical 3-bedroom, 2-storey house: 2 to 3 smoke detectors.
• LD2 — Escape routes plus high-risk rooms — all LD3 coverage plus detectors in rooms that present a higher fire risk or rooms where fire could block escape. This typically adds the kitchen (heat detector), living room, principal bedroom, and any room opening directly onto the escape route. Now the minimum standard for all new-build homes in England and all homes in Scotland. For a typical 3-bedroom house: 5 to 7 detectors.
• LD1 — Comprehensive coverage — detectors in all areas of the dwelling including every habitable room, every circulation space, and storage areas exceeding 1m2. This provides the earliest possible detection regardless of fire origin. Recommended for HMOs, supported housing, and properties occupied by vulnerable persons. For a typical 3-bedroom house: 8 to 12 detectors.

Domestic System Components

• Mains-powered interlinked smoke detector — £20 to £45 each. Optical smoke detection with built-in rechargeable battery backup. Aico, Kidde, and FireAngel are the leading UK brands.
• Mains-powered heat detector — £20 to £40 each. Fixed temperature or rate-of-rise detection (trade prices from £22.75 for Activ series heat detectors). Used in kitchens where smoke detectors would cause nuisance alarms.
• Wireless interlinked smoke alarm — £30 to £70 each. Battery-powered with radio-frequency interlinking. Higher unit cost but no cable installation required — ideal for retrofit.
• Cable (for hardwired systems) — 1.5mm2 fire-resistant cable (FP200 or equivalent): £1.50 to £3.00 per metre. A typical domestic installation requires 20 to 40 metres. Dedicated fused connection unit marked "Smoke Detector": £16 to £24 trade (Crabtree/Volex).

Commercial System Components

• Conventional fire alarm panel (2 to 8 zone) — £150 to £500. The central control unit that monitors all detection zones and activates sounders.
• Addressable fire alarm panel — £500 to £3,000+ depending on loop capacity. Each device has a unique address for precise location identification.
• Detectors and call points — £15 to £50 each for conventional, £30 to £100 each for addressable. Plus detector bases at £3 to £15 each.
• Sounders and beacons — £20 to £80 each. Wall-mounted or ceiling-mounted alarm sounders, with visual beacons for areas with high ambient noise or for hearing-impaired occupants.

• Domestic hardwired (retrofit) — £150 to £400 for a typical LD2 installation with 5 to 7 detectors. Includes cable routing, detector mounting, connection to a dedicated fused spur, testing, and certification. Allow 3 to 6 hours.
• Domestic wireless (retrofit) — £100 to £250 for a typical LD2 installation. Faster installation as no cables to route. Mount detectors, configure interlinking, test, and certify. Allow 2 to 3 hours.
• Commercial conventional (small office/shop) — £800 to £2,000 for a system with 10 to 20 detection points. Panel installation, zone wiring in fire-resistant cable, detector and call point installation, sounder installation, commissioning, and certification. Allow 2 to 4 days.
• Commercial addressable (larger premises) — £2,000 to £10,000+ for labour depending on the number of devices, building complexity, and integration requirements. Allow 1 to 4 weeks for larger projects.

• Domestic LD3 (escape routes only) — £250 to £500 total. 2 to 3 interlinked smoke detectors, cable or wireless, testing, and certificate.
• Domestic LD2 (escape routes plus high-risk rooms) — £500 to £1,000 total. 5 to 7 detectors (smoke and heat), mains-powered with battery backup, hardwired or wireless interlinked. The current standard for new builds.
• Domestic LD1 (comprehensive coverage) — £1,000 to £2,000 total. 8 to 12 detectors covering every habitable room, hardwired with fire-resistant cable. Required for many HMOs and supported housing.
• Commercial conventional (small premises) — £2,000 to £5,000 total. Control panel, 10 to 20 detection points, call points, sounders, fire-resistant wiring, commissioning, and certification.
• Commercial addressable (medium premises) — £5,000 to £15,000+ total. Addressable panel, 30 to 100+ devices, loop wiring, integration with building systems, and full BS 5839 Part 1 commissioning.

• Domestic systems — a fire alarm installation certificate confirming compliance with BS 5839 Part 6 and the grade achieved (LD1, LD2, or LD3). The electrical wiring also requires an EIC or Minor Works Certificate under BS 7671.
• Commercial systems — a BS 5839 Part 1 commissioning certificate including system verification, zone testing, sounder level measurements, and cause and effect testing. A full set of as-built drawings and zone charts must be provided.
• Testing — every detection device must be functionally tested to confirm it activates the alarm. Sound pressure levels must be measured to confirm adequate audibility in all occupied areas. Wiring must be tested for continuity, insulation resistance, and earth fault loop impedance.