Fix & Repair Engineers provides carbon monoxide detector installation, CO alarm fitting, alarm replacement and practical safety advice for properties with boilers, fires, heaters, commercial catering appliances and other fuel-burning equipment. Our service is suitable for homeowners, landlords, letting agents, facilities managers, commercial kitchens and business premises that need correctly positioned audible carbon monoxide alarms.
Carbon monoxide is dangerous because it cannot be seen, tasted or smelt. A properly selected and installed CO alarm gives an early audible warning, but it must be treated as one part of a wider safety approach that also includes appliance servicing, flue checks, adequate ventilation and competent gas, oil or solid fuel work.
Professional Carbon Monoxide Detector Installation
A carbon monoxide detector, more accurately called a carbon monoxide alarm, is a safety device designed to alert occupants when carbon monoxide is detected. It is particularly important in rooms or buildings where combustion appliances are present, including gas boilers, gas fires, oil-fired appliances, wood burners, commercial heaters and certain catering appliances.
Our engineers can assess the property layout, identify relevant fuel-burning appliances, advise on suitable alarm locations, fit or replace alarms, test them after installation and explain how they should be checked by the occupant, landlord or responsible person.
Safety-Led Advice
Alarm selection and placement based on appliance type, room use and manufacturer guidance
Competent Engineers
Support from heating, gas and property safety professionals where appliance checks are required
Domestic & Commercial
Suitable for homes, rental properties, commercial premises and operational buildings
Clear Reporting
Written notes can be provided to support maintenance, landlord and facilities records
Who Needs a Carbon Monoxide Alarm?
Carbon monoxide alarms are relevant wherever occupants could be exposed to carbon monoxide from a faulty, poorly maintained, incorrectly installed or poorly ventilated fuel-burning appliance. The right approach depends on the type of building, the appliance, the rooms affected and the legal or duty-holder responsibilities involved.
Homes with Boilers or Fires
CO alarms for rooms containing gas boilers, gas fires, oil appliances, wood burners or other fixed combustion appliances.
Landlords & Letting Agents
Support for rental properties where alarms must be fitted, checked and replaced when found faulty.
Commercial Kitchens
Advice for kitchens using gas-fired catering equipment, boilers, water heaters or appliances connected to flues or ventilation systems.
Commercial Premises
Alarm fitting for offices, workshops, plant rooms, warehouses, staff areas and premises with fuel-burning heaters.
HMOs & Managed Housing
Additional support for houses in multiple occupation, communal buildings and multi-occupancy properties.
After Appliance Work
Alarm installation or replacement after boiler, heater, fire or appliance installation, servicing or repair work.
What Our CO Alarm Installation Service Includes
Our installation service is designed to be practical, clear and safety-focused. We do not simply place alarms wherever there is space on a wall. The engineer considers the room, the appliance, the expected occupants, audibility, access for testing and the manufacturer’s instructions.
Property and Appliance Review
We identify relevant fuel-burning appliances, rooms used as living or working space, likely CO sources, flues, ventilation points and any access constraints.
Alarm Type Recommendation
We advise on suitable audible CO alarms, sealed battery units, replacement alarms or, where appropriate, hard-wired or linked options that may require electrical installation.
Correct Positioning and Fitting
The alarm is fixed or positioned in line with the alarm manufacturer’s instructions, the appliance location and practical audibility for occupants.
Testing and User Guidance
We test the alarm, confirm the indicator and sounder operation, and explain how to test the alarm, recognise end-of-life warnings and respond if it activates.
Reporting and Recommendations
Where required, we provide written notes showing the work completed and highlight any related appliance servicing, flue, ventilation or safety concerns.
CO Alarm Positioning, Standards and Detector Types
The best location for a carbon monoxide alarm depends on the appliance, the room and the alarm manufacturer’s instructions. In general terms, CO alarms should be positioned where carbon monoxide can be detected effectively and where the alarm can be heard by people at risk, particularly while sleeping.
For many domestic and rental scenarios, guidance refers to positioning the alarm at head height on a wall or shelf and approximately 1 to 3 metres away from the potential source of carbon monoxide. Alarms should not be obstructed, painted over, placed where airflow is blocked, or fitted where steam, dust, heat or draughts are likely to affect performance unless the manufacturer permits it.
Common CO Alarm Options
- Sealed long-life battery carbon monoxide alarms
- Mains-powered CO alarms where wiring is appropriate
- Interlinked or smart-compatible alarms where suitable
- Audible alarms for standard residential and commercial use
- Specialist alarms with visual or vibration alerts for accessibility needs
- Replacement alarms for expired or faulty units
Good Positioning Considers
- Distance from boiler, fire, heater or appliance
- Whether the room is used for living, sleeping or working
- Ability to hear the alarm from bedrooms or occupied areas
- Manufacturer instructions and mounting restrictions
- Avoidance of vents, windows, steam and direct heat
- Access for testing, cleaning and replacement
Landlord, Commercial and Compliance Considerations
For landlords, carbon monoxide alarm requirements in England apply to relevant rented homes and sit alongside wider property safety duties. For workplaces and commercial premises, the exact requirements depend on the type of building, occupancy, appliances, risk assessment and applicable safety duties. In both cases, fitting an alarm is only one part of managing CO risk.
| Situation | Key consideration | How we help |
|---|---|---|
| Rental properties | Relevant landlords must provide CO alarms in rooms used as living accommodation containing fixed combustion appliances, excluding gas cookers | We fit, replace and test CO alarms and provide written notes for landlord maintenance records |
| Commercial premises | Duty holders should consider CO exposure risk where boilers, heaters or combustion appliances are present | We advise on practical alarm provision and identify when appliance inspection or servicing is required |
| Commercial kitchens | Gas-fired catering appliances, extraction, interlocks and ventilation can all affect safe operation | We support catering environments with alarm fitting, appliance safety advice and relevant gas engineering attendance |
| Managed buildings | Multi-occupancy buildings often need clear responsibility for testing, replacement and record keeping | We help facilities teams plan alarm locations, replacement schedules and reporting requirements |
Testing, Replacement and Maintenance of CO Alarms
Carbon monoxide alarms do not last indefinitely. Many units have a fixed sensor life and will need replacing at the end-of-life date even if they appear physically intact. Some alarms use sealed batteries, some use replaceable batteries and others are mains-powered with back-up power. The manufacturer’s instructions should always be followed.
When to Replace a CO Alarm
- The alarm has reached its expiry or end-of-life date
- The alarm fails a test or shows a fault indicator
- The sounder is weak, inconsistent or does not operate
- The unit has been damaged, painted over or contaminated
- The property has changed layout or appliance arrangement
- A landlord or duty holder needs clearer records for compliance
Good Ongoing Practice
- Test alarms according to manufacturer guidance
- Keep alarms unobstructed and free from dust
- Do not paint, cover or move alarms without checking suitability
- Record installation and replacement dates
- Brief tenants, staff or occupants on what the alarm means
- Arrange appliance servicing by the correct qualified engineer
What to Do if a Carbon Monoxide Alarm Sounds
A CO alarm should always be treated seriously. Carbon monoxide can be produced by faulty appliances, poor combustion, blocked flues, inadequate ventilation or unsafe use of equipment such as barbecues, generators or portable heaters in enclosed spaces.
Leave the Building and Get Fresh Air
Move everyone away from the suspected source. Open doors and windows only if it is safe to do so and do not delay leaving the property.
Call Emergency Help if Anyone Is Unwell
If anyone has symptoms such as headache, dizziness, nausea, confusion, breathlessness, chest pain or collapse, call 999 and request urgent medical help.
Contact the Gas Emergency Service if Gas May Be Involved
Call 0800 111 999 if a gas appliance, gas boiler, gas fire, gas cooker, gas heater or gas supply may be connected to the incident.
Do Not Re-Enter Until Checked
Do not return to the property until the suspected source has been inspected and made safe by a suitably qualified professional.
Carbon Monoxide Detector Installation Across London and the Home Counties
Fix & Repair Engineers provides carbon monoxide detector installation, replacement and safety advice across London and the Home Counties. This page acts as the main hub for our CO alarm fitting service and is suitable for domestic properties, rental accommodation, commercial buildings and sites with heating or catering equipment.
Areas We Cover
- London and Greater London
- Essex, Kent and Suffolk
- Hertfordshire and Buckinghamshire
- Surrey and Sussex
- Wider Home Counties coverage on request
- Domestic and commercial attendance depending on the site and scope
Information Helpful When Booking
- Full postcode and property type
- Whether the property is owner-occupied, rented or commercial
- Fuel-burning appliance type, make and location if known
- Whether you need a new alarm, replacement alarm or appliance check
- Any symptoms, alarm activations or gas smell concerns
- Access details and preferred attendance time