PART J · Combustion appliances
When is a carbon monoxide alarm required
The Part J guidance provides for carbon monoxide alarms when relevant fixed combustion appliances are installed in dwellings. The provisions were extended in 2022. Do not assume the requirement is limited to wood burning stoves.
Which appliances does the guidance address
The relevant guidance covers fixed combustion appliances, with an exception for appliances used solely for cooking. Check the provision for the particular appliance and work rather than treating all gas or fuel-burning equipment alike.
This article concerns building regulations. Separate landlord alarm duties may also apply and should be checked independently.
Where should the alarm be fitted
Use the applicable guidance and the manufacturer's instructions. Positioning needs to suit the room and appliance. A device placed wherever a spare socket is available may not meet the intended arrangement.
Ask the installer to identify the location on the handover information and show the occupant how to test the alarm and recognise its warnings.
Does an alarm make an old appliance safe
No. It is a warning measure, not a repair. The appliance still needs suitable air supply, a sound flue arrangement and appropriate maintenance.
For example, installing an alarm should not be used to justify blocking a ventilation opening because the room feels draughty.
What should you check before completion
Confirm the appliance-specific requirements, suitable alarm identification, installation and operating instructions. Include testing and eventual replacement in the household maintenance routine.
If other building work changes the room or flue surroundings, ask whether the existing safety arrangement remains suitable.
Respond to an alarm according to the device instructions and appropriate emergency advice. Do not silence it and carry on using the appliance without establishing the cause.
Keep the alarm information alongside appliance commissioning and servicing records so the complete safety arrangement remains understandable.