Do carbon monoxide alarms have to be interlinked?

No. They must be fitted where there is a fuel-burning appliance or flue, but they do not need to link to the fire alarms.

Does a kitchen need a smoke alarm?

A heat alarm is used in the kitchen; a smoke alarm there would cause false alarms.

Landlord property care

Alarms in a rented property

The interlinked standard, and keeping it evidenced

The short answer

Every Scottish home, including private lets, needs interlinked smoke alarms in the main living room and every circulation space on each storey, a heat alarm in the kitchen, and a carbon monoxide alarm wherever there is a fuel-burning appliance or flue. Alarms must be ceiling-mounted and interlinked so all sound together. Landlords should log testing and replacement dates.

What the work involves

Specifying sealed long-life battery or mains alarms that interlink, siting them correctly, testing regularly, and replacing at the end of the manufacturer's life — usually ten years.

Rules and responsibilities in Scotland

The standard applies to all Scottish homes and forms part of the Repairing Standard for lets. Carbon monoxide alarms do not need to be interlinked with the fire alarms. HMOs are subject to a higher fire detection specification.

What commonly goes wrong

Battery alarms that are not interlinked, alarms mounted on walls rather than ceilings, and units left in place well past their ten-year life.

What it usually costs

Indicative ranges only, to help you judge a quote. They are not an estimate for your property — only the business doing the work can give you that.

Sealed ten-year interlinked units cost more upfront than replaceable-battery alarms but avoid tenant battery removal.
Mains-wired systems are more expensive to install but are often specified in HMOs.
Replacement is a predictable ten-year cost worth diarising per property.

What to do, in order

1Map the required positions: living room, every hallway and landing, kitchen heat alarm.
2Add a carbon monoxide alarm to any room with a boiler, fire or flue.
3Confirm all fire alarms interlink and test the link, not just each unit.
4Show the tenant how to test and record the handover.
5Diarise replacement ten years from the manufacture date.

Local detail for the Lothians

Edinburgh tenement flats often need more alarms than owners expect because long internal hallways count as circulation space.
Open-plan conversions change where the living room alarm has to sit.
Older flats with a gas fire in the front room need a carbon monoxide alarm even if the fire is decorative but connected.

When you need a professional

An electrician should install mains-wired systems; an HMO fire detection system should be specified by someone competent in BS 5839.

Common questions

Do carbon monoxide alarms have to be interlinked?: No. They must be fitted where there is a fuel-burning appliance or flue, but they do not need to link to the fire alarms.
Does a kitchen need a smoke alarm?: A heat alarm is used in the kitchen; a smoke alarm there would cause false alarms.

Lothian Property is a property information and professional-introduction service operated by Maybury Scotland Limited. Lothian Property is not an estate agency. Where requested, we may connect homeowners with independent estate agents and other property professionals. How we work.

Fire safety in a let
Fire doors, escape routes, furnishings and the extra duties that come with shared occupancy.
Meeting the Repairing Standard
The legal condition test every private let in Scotland has to meet, and how landlords evidence it.
Landlord gas safety checks
The annual gas safety check, what it covers, and the records a landlord has to hold.

Last reviewed 4 September 2026.