The alarm rules for a home depend on where it is and who owns it. Scotland has one standard for every home. England has a statutory minimum for rented property and guidance for everybody else. Wales and Northern Ireland have their own positions. Reading advice written for the wrong jurisdiction is the most common way people end up with the wrong answer.
England, rented and owned
In rented homes the regulations require at least one smoke alarm on each storey used as living accommodation, plus carbon monoxide alarms in rooms with a fixed combustion appliance other than a gas cooker, working at the start of each tenancy. For owner occupiers there is no equivalent statutory duty, and the design standard for dwellings is guidance rather than law, which does not make it less worth following.
Scotland's single standard
Scotland requires every home, owned or rented, to have interlinked alarms: smoke alarms in the main living room and in circulation spaces on each storey, a heat alarm in the kitchen, and carbon monoxide alarms where there is a fuel burning appliance. It is the clearest domestic standard in the UK and it applies regardless of tenure, which is the difference people most often miss.
Free home fire safety visits
Fire and rescue services across the UK offer free home fire safety visits, and in many areas will fit alarms free of charge for households who need them, prioritising older people, people with limited mobility and households assessed as higher risk. This is a genuine free service from the fire service rather than a commercial offer, and it is requested directly from your local service.
What to buy if you are buying
Buy a set from one range so they interlink, count the storeys and the rooms before you order, and check whether your property needs mains powered units before choosing battery ones. Look for the stated service life and write the replacement date somewhere you will see it. Those four decisions matter more than the brand.
Questions people ask about house fire alarms
Are smoke alarms a legal requirement in an owned home in England?
There is no statutory duty on an owner occupier in England equivalent to the one on landlords. The design standard for dwellings is guidance. In Scotland the standard applies to every home regardless of tenure.
Can I get free smoke alarms?
Fire and rescue services offer free home fire safety visits across the UK and will often fit alarms free for households assessed as higher risk. Contact your local service directly.
How many alarms does a two storey house need?
At minimum one per storey in a rented home in England. Good practice, and the Scottish standard, is circulation spaces on each storey plus the main living room, with a heat alarm in the kitchen, all interlinked.