An alarm that hasn't been tested is a liability, not a safeguard. We test, maintain and replace smoke and CO alarms on a fixed schedule, across every sector — so nothing lapses, and nothing gets forgotten.
Every test, service and replacement is carried out and certified against the specific standard your property type is held to.
Smoke alarm on every floor, CO alarm in any room with a fixed combustion appliance, tested at the start of every tenancy.
Grade and category requirements (Grade A-F, LD1-LD3) for houses, flats and HMOs.
Category L and P fire detection systems for workplaces, from offices to warehouses.
Heat alarm and interconnection requirements for domestic smoke and heat detectors.
The legal duty on employers and building owners to maintain working fire detection.
Enhanced checks on communal detection and flat entrance alarms in taller residential blocks.
The right alarm grade and category depends entirely on how the building is occupied — we scope to the sector, not a generic minimum.
Battery, non-interlinked minimum; interlinked recommended
Interlinked required, mains or long-life battery powered
Interlinked mandatory, category depends on size and layout
Communal detection plus individual flat alarms
System category set by occupancy and fire risk assessment
Higher category given fire load and evacuation time
Category tailored to occupancy numbers and building layout
Highest category — vulnerable, often non-ambulant occupants
Sleeping-risk category throughout guest areas
Interlinked system across shared and private rooms
Alarms have a working life of around 10 years. Pick the level of cover that matches how much of that lifecycle you want us to manage.
Confirms every alarm works, on a fixed annual schedule.
Testing plus batteries and minor faults fixed on the spot.
Testing, maintenance and the 10-year replacement built in — never budget for it separately again.
Scoped to your system category, number of zones and site count.
A representative sample of recent work. Full case studies and references available on request.
Smoke and CO alarm test at tenancy renewal, one unit replaced after failing sensor test.
Replaced ageing battery units with a fully interlinked Grade A system ahead of licence renewal.
Routine service of a Category L2 detection system across three floors.
Category L1 system service across racking and loading bay zones.
Full-site alarm test across classrooms, hall and kitchen ahead of a new term.
Full test and battery replacement across a 40-bed residential care facility.
Category L1 service across 28 guest rooms and communal areas.
Communal detection test plus individual flat entrance alarm checks, post-2022 regs.
Full block test ahead of the academic year, interlinked Grade A system across all rooms.
Representative examples — site names withheld for client confidentiality. Ask for references relevant to your sector.
Accredited alarm testing engineers across London and the South East, with every test and service logged to your compliance record wherever your properties are.
Care packages above are cheaper over time — but every service is also available as a one-off, fixed price upfront.
| Service | Standard | From |
|---|---|---|
| Testing | ||
| Smoke & CO alarm test — domestic (up to 5 alarms) | Smoke & CO Alarm Regs | £45 |
| Smoke & CO alarm test — HMO | BS 5839-6 | £75 |
| Commercial system test (per visit, up to 20 heads) | BS 5839-1 | £120 |
| Maintenance | ||
| Battery replacement (per unit) | — | £12 |
| Sensor clean & fault diagnosis (per unit) | — | £20 |
| Commercial 6-monthly service contract (per visit) | BS 5839-1 | £150 |
| Replacement | ||
| Single alarm replacement (like-for-like) | — | £35 |
| Full property replacement (up to 5 alarms) | BS 5839-6 | £180 |
| Interlinked wireless system upgrade | BS 5839-6 Grade A | £350 |
| Commercial system replacement (per zone) | BS 5839-1 | Custom quote |
Domestic and single-property jobs — book a live slot instantly. HMO, commercial and portfolio work — send an enquiry and we'll come back with a fixed quote.
Real-time availability via our booking system. Opens in a new tab.
If the calendar above doesn't load, open live booking in a new tab →
Sent securely to our team — no email app required.
We reply within one working day. For anything urgent, call 0203 908 4790.
Most smoke and CO alarms have a working life of around 10 years, after which the sensor degrades regardless of how well it's maintained. Our Full Lifecycle Plan builds this replacement into the monthly fee so it's never a surprise cost.
The Smoke and Carbon Monoxide Alarm (England) Regulations require testing at the start of every tenancy, and it's best practice to test at least annually regardless of tenancy changes.
Grade A systems have a control panel and standby power supply, typically required for HMOs and higher-risk properties. Grade D1 is mains-powered with battery backup, interlinked, and suitable for most single-let rented homes.