Carbon monoxide (CO) alarms are a legal requirement in many UK rental properties and an essential safety device in all homes. If you are a landlord, failing to comply with carbon monoxide alarm regulations can result in fines of up to £5,000 per breach.
This 2026 guide explains:
- When carbon monoxide alarms are legally required
- Landlord responsibilities
- Differences between England, Wales and Scotland
- Installation rules
- Penalties for non-compliance
Are Carbon Monoxide Alarms Legally Required in the UK?
Yes — in rental properties.
Under the Smoke and Carbon Monoxide Alarm (Amendment) Regulations, landlords must install carbon monoxide alarms in properties containing certain fuel-burning appliances.
Homeowners are not legally required to install CO alarms, but it is strongly recommended for safety.
Smoke Alarms must also be installed in all properties.
Landlords must also comply with electrical safety rules, including obtaining a valid EICR for the property.
Carbon Monoxide Alarm Requirements in England (2026)
In England, landlords must:
- Install at least one carbon monoxide alarm in every room containing a fixed combustion appliance
- Ensure alarms are working at the start of each new tenancy
- Repair or replace alarms once notified by tenants
This applies to rooms containing:
- Gas boilers
- Solid fuel burners (wood, coal)
- Oil-fired appliances
Gas cookers alone are generally excluded unless advised otherwise.
Carbon Monoxide Alarm Rules in Wales
Wales follows similar regulations to England.
Landlords must:
- Install CO alarms in rooms with fixed combustion appliances
- Ensure alarms are operational at tenancy start
Local authority enforcement applies in the same way.
Carbon Monoxide Alarm Rules in Scotland
Scotland has stricter requirements.
CO alarms must be installed:
- In every room containing a fuel-burning appliance
- In rooms where flues pass through
- Sometimes interlinked with smoke alarms
Scotland’s standards are generally considered the most comprehensive in the UK.
Carbon Monoxide Alarm Requirements by Country
| Country | CO Alarm Required? | Applies To | Enforcement |
|---|---|---|---|
| England | Yes | Rental properties with combustion appliances | Local Authority |
| Wales | Yes | Similar to England | Local Authority |
| Scotland | Yes (stricter) | Fuel-burning appliances + flues | Local Authority |
Where Should Carbon Monoxide Alarms Be Installed?
Best practice installation guidelines:
- In the same room as the combustion appliance
- At least 15cm below the ceiling (wall mounted)
- Not directly next to boilers or fireplaces
- Away from bathrooms and kitchens
Always follow manufacturer installation instructions.
If you’re unsure which alarm to choose, see our guide to the best smoke alarms for UK homes.
What Are the Penalties for Non-Compliance?
If a landlord fails to comply:
| Breach | Potential Consequence |
|---|---|
| No CO alarm installed | Fine up to £5,000 |
| Faulty alarm not replaced | Enforcement notice |
| Failure to test at tenancy start | Local authority action |
| Repeat non-compliance | Increased enforcement action |
Fines are usually issued per property.
Who Is Responsible for Maintenance?
Landlord Responsibilities
- Install alarms
- Ensure working order at start of tenancy
- Repair or replace faulty units
Carbon monoxide alarms are just one part of landlord compliance. You must also ensure you have a valid Energy Performance Certificate (EPC) before renting out a property.
Best Carbon Monoxide Alarms (buyer page)
Tenant Responsibilities
- Replace batteries (if battery powered)
- Report faults promptly
Landlords remain legally responsible for ensuring compliance.
Why Carbon Monoxide Alarms Are Critical
Carbon monoxide is:
- Colourless
- Odourless
- Invisible
- Potentially fatal
Symptoms of CO poisoning include:
- Headaches
- Dizziness
- Nausea
- Confusion
Early detection can prevent serious injury or death.
Do Homeowners Need Carbon Monoxide Alarms?
While not legally required in owner-occupied homes in most cases, installing CO alarms is strongly recommended — particularly if your property has:
- Gas boilers
- Log burners
- Open fires
- Oil heating systems
CO alarms are inexpensive compared to the potential risk.
Landlords must also ensure they comply with other safety regulations, including obtaining a valid gas safety certificate each year.
Quick Summary
- Carbon monoxide alarms are legally required in UK rental properties
- Must be installed near fixed combustion appliances
- Scotland has stricter requirements
- Landlords can be fined up to £5,000
- Homeowners are strongly advised to install them
For product recommendations, see our guide to the best carbon monoxide alarms for UK homes.
Frequently Asked Questions
Are carbon monoxide alarms legally required in the UK?
Yes. Landlords in the UK must install carbon monoxide alarms in rooms containing fixed combustion appliances such as gas boilers or solid fuel burners. Homeowners are strongly advised to install them for safety.
Where should a carbon monoxide alarm be installed?
Carbon monoxide alarms should be installed in the same room as the fuel-burning appliance, positioned at least 15cm from the ceiling and away from bathrooms or kitchens.
What is the fine for not installing a carbon monoxide alarm?
Landlords who fail to install required carbon monoxide alarms can face fines of up to £5,000, enforced by local authorities.
Do gas cookers require a carbon monoxide alarm?
In most cases, carbon monoxide alarms are required for fixed combustion appliances such as boilers or solid fuel burners, but not typically for gas cookers alone.
Are carbon monoxide alarms required in Scotland?
Yes. Scotland has stricter regulations requiring carbon monoxide alarms in rooms containing fuel-burning appliances, and in some cases alarms must be interlinked.
Who is responsible for maintaining carbon monoxide alarms?
Landlords are responsible for installing and ensuring alarms work at the start of a tenancy. Tenants are usually responsible for replacing batteries and reporting faults.