Smoke & Fire AlarmInstallation
Mains-powered interlinked smoke, heat, and CO detectors professionally installed to BS 5839-6. Same-day service, full certification, and 12-month guarantee. Protect your family and comply with regulations.
Why Professional Fire Alarm Installation Matters
Smoke alarms save lives — but only when they're correctly positioned, properly powered, and reliably interlinked. A battery alarm stuck to the ceiling with adhesive is better than nothing, but it's not adequate protection for a modern home.
The limitations of battery-only alarms:
- Batteries die — and dead alarms protect nobody
- Standalone alarms don't alert you to fires on other floors
- Incorrect positioning leads to missed fires or constant false alarms
- Non-compliant systems can void insurance or fail landlord inspections
Professional mains-powered installation with battery backup eliminates these risks. When one detector triggers, every alarm in the house sounds simultaneously — giving you maximum warning time regardless of where the fire starts.
We install systems across all property types — from Victorian terraces in Croydon to modern apartments in Lewisham and rural homes near Edenbridge.
What We Install
Optical Smoke Detectors
For bedrooms, hallways, landings, and living rooms. These detect visible smoke from smouldering fires — the most common type in residential settings. Positioned on ceilings at optimal detection points.
Heat Detectors
For kitchens, garages, utility rooms, and loft spaces. Heat detectors trigger on temperature rise rather than particles, preventing false alarms from cooking steam or dust while still protecting against fire.
Carbon Monoxide Detectors
Essential near gas boilers, wood burners, open fires, and any fuel-burning appliance. CO is odourless, colourless, and lethal. Detection is the only warning you'll get. We position CO detectors at breathing height for fastest response.
Interlinked Wiring
All detectors are hardwired together so that activation of any single unit triggers every alarm in the property. This is critical in multi-storey homes where a kitchen fire may not wake someone on the top floor. Mains power with battery backup ensures operation during power cuts.
Integration with Existing Electrics
We connect alarm systems to your existing electrical installation, ensuring proper circuit protection and labelling at the consumer unit. For properties with older wiring, we assess capacity and recommend upgrades if needed.
Our Installation Process
From survey to certification, we handle everything to ensure your fire detection system is correctly specified, installed, and documented.
Free Survey
We assess your property layout, identify optimal detector positions, and recommend the right system for your needs.
System Design
We specify interlinked smoke, heat, and carbon monoxide detectors to meet current regulations and your property type.
Professional Install
Mains-powered detectors with battery backup hardwired into your electrical system. Clean installation with minimal disruption.
Full Testing
Every detector individually tested and interlink function verified. We ensure your system activates correctly throughout.
Certification
Full documentation including Minor Works Certificate. 12-month workmanship guarantee on all installations.
Why Choose 24/7 Electrical for Fire Alarms
Qualified, experienced, and thorough — we install systems that comply with regulations and actually protect your family.
Legal Compliance
Scotland already requires interlinked alarms. England is moving the same way. We install systems that meet and exceed current requirements including BS 5839-6.
Interlinked Systems
When one alarm sounds, they all sound. Critical in larger properties where a fire in one room may not be heard elsewhere. Mains-powered for reliability.
Heat & Smoke Detection
Optical smoke detectors for living areas, heat detectors for kitchens and garages. The right detector type in every location prevents false alarms.
Carbon Monoxide Protection
CO detectors installed near boilers, fireplaces, and fuel-burning appliances. Odourless and lethal — CO detection saves lives.
Landlord Compliant
Rental properties require working smoke alarms on every floor. We install regulation-compliant systems with documentation for your records.
Same-Day Service
Most installations completed in a single visit. Minimal disruption, clean finish, and immediate protection for your property.
Fire Alarm Installation FAQs
Common questions about smoke alarms, heat detectors, and fire detection systems.
Signs Your Fire Detection Needs Upgrading
Fire alarm regulations have tightened repeatedly. Most homes and businesses are now under-protected without realising it.
From January 2022, Scotland requires interlinked alarms in every home; England's standards under HHSRS are converging. Landlords without compliant systems face civil and criminal liability.
- Your smoke alarms are battery-only or beep at random
- You can stand in the hallway and not hear the kitchen alarm clearly
- Your property is rented and predates current LACORS / Smoke and CO Alarm regulations
- Your commercial premises has had no recent BS 5839 fire risk assessment
- You've extended, converted a loft or split a property without re-zoning the alarm
- Sounders, call points or detectors look discoloured, taped over or removed
- Your fire alarm log book is missing, blank or older than 12 months
- You're applying for an HMO licence or short-let registration
Fire Alarm Installation Pricing
Domestic and commercial systems designed to BS 5839 — fully certified and signed-off.
| Job Type | Typical Price | What's Included |
|---|---|---|
| Domestic Grade D mains-wired smoke alarms (per alarm) | £95–£140 | Mains-powered with battery backup, interlinked, BS 5839-6 compliant. |
| Whole-house Grade D system (3-bed) | £420–£680 | Smoke alarms in escape routes, heat alarm in kitchen, full interlinking and certificate. |
| HMO / rented property upgrade pack | £550–£950 | Designed to LACORS guidance and meeting LD2 / LD1 requirements. |
| Small commercial fire alarm (Cat L4 / M) | £1,800–£3,800 | Manual call points, sounders, control panel — designed and certified to BS 5839-1. |
| Addressable commercial system (per zone) | From £950 per zone | Identifies the exact device in alarm — essential for larger or multi-floor sites. |
| Annual service & certification | From £180 | Full inspection, log book maintenance and BS 5839 service certificate. |
Prices shown are typical guide ranges for Greater London and the South East as of 2026. Every job is quoted in writing on a fixed-price basis after a free site assessment — you only pay the figure we agree, with no hidden extras.
Worried About Fire Alarm Installation?
These are the four objections we answer most. Honest answers below.
"Will you have to chase walls and lift floors?"
For most domestic upgrades, no. Modern interlinked alarms can be wireless, with mains feeds taken from existing lighting circuits. Cabling is only chased where you specifically prefer a hardwired system.
"What if the system goes off when there's no fire?"
We specify the right detector type for each location — heat alarms in kitchens, photoelectric in living areas — to virtually eliminate cooking-fume false alarms. Common to nuisance-trip with the wrong unit, rare with the right one.
"Will it pass the council / insurer / fire officer inspection?"
Every install is designed to BS 5839-6 (domestic) or BS 5839-1 (commercial), commissioned to schedule and supplied with the certificates and zone plans inspectors expect to see.
"Who maintains it after you've gone?"
We offer annual service contracts with a fixed callout rate, log-book updates and reactive cover. Or you can use any competent contractor — the system is open and standard.
Don't Wait for an Inspection — Get Compliant Now
Fire alarm work is one of the few jobs that's literally life-and-death. Book a free survey this week and get a fully designed, BS 5839-compliant system in writing.
NICEIC approved · 25+ years' experience · 12-month workmanship guarantee