--- title: "Smoke & Fire Alarm Installation London | Interlinked Systems" description: "Smoke alarm, heat detector and CO alarm installation in London. Mains-powered interlinked systems. BS 5839 compliant. 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In England, every rental property must have at least one smoke alarm per floor. Building regulations for new builds and major renovations require mains-powered interlinked systems. We recommend interlinked alarms for all properties regardless of legal minimum." } }, { "@type": "Question", "name": "What's the difference between smoke and heat detectors?", "acceptedAnswer": { "@type": "Answer", "text": "Smoke detectors (optical) respond to visible smoke particles — ideal for bedrooms, hallways, and living rooms. Heat detectors respond to temperature rise — designed for kitchens, garages, and utility rooms where steam or cooking fumes would trigger false alarms from smoke detectors." } }, { "@type": "Question", "name": "How much does smoke alarm installation cost?", "acceptedAnswer": { "@type": "Answer", "text": "A basic mains-powered interlinked system for a typical 3-bedroom house costs from around £300–£500 depending on the number of detectors and property layout. We provide exact fixed quotes after a free survey." } }, { "@type": "Question", "name": "Do you install carbon monoxide detectors?", "acceptedAnswer": { "@type": "Answer", "text": "Yes. We install CO detectors as part of a comprehensive alarm system. These are essential in properties with gas boilers, open fires, wood burners, or any fuel-burning appliance. CO is odourless and potentially fatal." } }, { "@type": "Question", "name": "Can you upgrade my existing battery alarms to mains-powered?", "acceptedAnswer": { "@type": "Answer", "text": "Yes. We replace standalone battery alarms with hardwired mains-powered detectors with battery backup. This eliminates the risk of dead batteries and ensures reliable detection at all times." } }, { "@type": "Question", "name": "How often should smoke alarms be replaced?", "acceptedAnswer": { "@type": "Answer", "text": "Smoke detectors should be replaced every 10 years, heat detectors every 10 years, and CO detectors every 5–7 years depending on the manufacturer. We can assess your existing system and replace units that are past their effective life." } }, { "@type": "Question", "name": "Do landlords need interlinked alarms?", "acceptedAnswer": { "@type": "Answer", "text": "Current regulations require landlords to provide at least one smoke alarm on each storey and a CO alarm in rooms with solid fuel appliances. We recommend mains-powered interlinked systems for best protection and full compliance." } }, { "@type": "Question", "name": "What areas do you cover for fire alarm installation?", "acceptedAnswer": { "@type": "Answer", "text": "We install fire and smoke alarm systems across London and the South East including Croydon, Bromley, Sutton, Edenbridge, and 16 service areas. Same-day installation available." } } ] }, { "@context": "https://schema.org", "@type": "BreadcrumbList", "itemListElement": [ { "@type": "ListItem", "position": 1, "name": "Home", "item": "https://24-7electrician.co.uk/" }, { "@type": "ListItem", "position": 2, "name": "Services", "item": "https://24-7electrician.co.uk/services" }, { "@type": "ListItem", "position": 3, "name": "Smoke & Fire Alarm Installation", "item": "https://24-7electrician.co.uk/services/fire-alarm-installation" } ] } ] --- 24/7 Emergency Call-Outs • London & South East [info@24-7electrician.co.uk](mailto:info@24-7electrician.co.uk)[Available 24/7 0203 576 6961](tel:02035766961) [![24/7 Electrical Ltd — Emergency Electrician London](/assets/logo-DYN9PriP.png)](/) [Home](/) [About](/about) Residential Commercial Areas [Reviews](/reviews) [Blog](/blog) [Contact](/contact) [Available 24/7 0203 576 6961 ](tel:02035766961)[Book Consultation](/book-a-consultation)[Get a Free Quote](/contact) 1. [Home ](/) 2. [Services](/services) 3. Smoke & Fire Alarm Installation ![Professional electrician installing mains-powered smoke detector on ceiling](/assets/hero-fire-alarm-lTwyjhg0.jpg) BS 5839-6 Compliant Installation # Smoke & Fire Alarm Installation 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. [Request a Free Quote](/contact)[0203 576 6961](tel:02035766961) Last updated: 26 August 2026 · Reviewed by Steve Green, NICEIC-approved electrician Same Day Installation NICEIC Approved BS 5839 Compliant 12mo Guarantee 24/7 Support ## 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](/areas/croydon) to modern apartments in [Lewisham](/areas/lewisham) and rural homes near [Edenbridge](/areas/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](/services/consumer-units). For properties with older wiring, we assess capacity and recommend upgrades if needed. Our Process ## Our Installation Process From survey to certification, we handle everything to ensure your fire detection system is correctly specified, installed, and documented. 01 1 hr ### Free Survey We assess your property layout, identify optimal detector positions, and recommend the right system for your needs. 02 1–2 hrs ### System Design We specify interlinked smoke, heat, and carbon monoxide detectors to meet current regulations and your property type. 03 Same day ### Professional Install Mains-powered detectors with battery backup hardwired into your electrical system. Clean installation with minimal disruption. 04 Half – 3 days ### Full Testing Every detector individually tested and interlink function verified. We ensure your system activates correctly throughout. 05 1 hr ### Certification Full documentation including Minor Works Certificate. 12-month workmanship guarantee on all installations. Benefits ## 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. FAQ ## Fire Alarm Installation FAQs Common questions about smoke alarms, heat detectors, and fire detection systems. ### Are interlinked smoke alarms a legal requirement? ### What's the difference between smoke and heat detectors? ### How much does smoke alarm installation cost? ### Do you install carbon monoxide detectors? ### Can you upgrade my existing battery alarms to mains-powered? ### How often should smoke alarms be replaced? ### Do landlords need interlinked alarms? ### What areas do you cover for fire alarm installation? Signs You Need This ## 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 Indicative Pricing ## 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. Honest Answers ## 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. ![Professional electrician ready for fire alarm installations](/assets/cta-background-BI2H9wJG.jpg) Free Survey Slots Open This Fortnight ## 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. [Book Fire Alarm Survey](/contact)[Available 24/7 0203 576 6961 ](tel:02035766961) NICEIC approved · 25+ years' experience · 12-month workmanship guarantee ### 24/7 Electrical Ltd NICEIC-approved electricians. Available 24/7 for emergencies and planned work across London & South East. [0203 576 6961](tel:02035766961) [07557 781201](tel:07557781201) [info@24-7electrician.co.uk](mailto:info@24-7electrician.co.uk) Head Office 51 High Street, Edenbridge, Kent TN8 Croydon Office 104 Friars Wood, Croydon, CR0 9JP [](https://www.instagram.com/247electricalkent/)[](https://www.facebook.com/profile.php?id=100084202661265)[](https://www.youtube.com/channel/UCBm6o6WrQ68wI7KRlXyBzbA)[](https://www.tiktok.com/@247electricalltd) #### Services - [Emergency Repairs](/services/emergency-repairs) - [House Rewiring](/services/house-rewiring) - [EICR Testing](/services/eicr-testing) - [EV Chargers](/services/ev-charger-installation) - [Consumer Units](/services/consumer-units) - [Lighting](/services/lighting-installation) - [Fire Alarms](/services/fire-alarm-installation) - [Garden Lighting](/services/garden-lighting) - [Kitchen & Bathroom](/services/bathroom-kitchen-electrics) - [CCTV](/services/cctv-installation) - [Smart Home](/services/smart-home) - [Commercial](/services/commercial-electrical) - [PAT Testing](/services/pat-testing) - [Maintenance](/services/electrical-maintenance) - [Fault Finding](/services/fault-finding) - [Appliance Repair](/services/appliance-repair) #### Areas We Cover - [Croydon](/areas/croydon) - [Sutton](/areas/sutton) - [Mitcham](/areas/mitcham) - [Bromley](/areas/bromley) - [Beckenham](/areas/beckenham) - [Edenbridge](/areas/edenbridge) - [Orpington](/areas/orpington) - [Penge](/areas/penge) - [Sydenham](/areas/sydenham) - [Lewisham](/areas/lewisham) - [Dulwich](/areas/dulwich) - [Streatham](/areas/streatham) - [Tooting](/areas/tooting) - [Westerham](/areas/westerham) - [Oxted](/areas/oxted) - [Caterham](/areas/caterham) #### Company - [About Us](/about) - [Case Studies](/case-studies) - [Reviews](/reviews) - [Blog](/blog) - [Contact](/contact) - [Privacy Policy](/privacy) - [Terms & Conditions](/terms) - [Cookie Policy](/cookies) © 2026 24/7 Electrical Ltd. 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