A smoke alarm that starts chirping at three in the morning is more than a nuisance. In a rental in Motherwell or Wishaw it can also be a sign that the property is no longer meeting the standard Scotland expects of every house.
From 1 February 2022, every home in Scotland has had to meet the Tolerable Standard for fire and carbon monoxide detection. One of the less obvious parts of that standard is the power source. The official guidance allows mains-powered alarms with a battery backup, or tamper-proof long-life lithium batteries. It does not treat an ordinary user-replaceable battery, the kind you swap once a year, as a suitable main power supply.
That is why a cheap “just change the battery” alarm can be the wrong product for a Scottish house, even before you get into how convenient it is.
What Scotland actually requires
In plain terms, a house should have a smoke alarm in the room used most during the day (usually the living room), a smoke alarm in every hallway or landing, and a heat alarm in every kitchen. Those alarms must be ceiling mounted and interlinked, so that when one sounds, they all sound. A carbon monoxide alarm is also required in a room with a fixed combustion appliance or a flue — a boiler, stove or fire, but not a cooker on its own.
The Scottish Government sets this out in its tolerable standard guidance on satisfactory fire and carbon monoxide detection. Wireless interlinking is allowed. You do not have to hard-wire a house to comply. You do have to use a secure power source for the life of the unit.
Sealed long-life batteries and replaceable batteries
A sealed 10-year battery is built into the alarm and is not meant to be changed by the user. During that stated life you should still test the alarm, but you are not on a yearly battery run. When the battery or the unit reaches the end of its life, you replace the whole alarm.
A replaceable-battery alarm lets you fit a new cell if the battery is tired. That can look cheaper at the checkout, and it is familiar. The catch, in Scotland, is that a standard user-replaceable battery is not what the Tolerable Standard is asking for as the main supply. Even where a replaceable-battery model is used in other parts of the UK, it may not be the right answer here.
Two other points are easy to mix up. Battery life is not the same as the life of the smoke sensor. A working test button is useful, but it does not extend the manufacturer’s replace-by date. When an alarm is at the end of its service life, the whole unit should come down, whatever kind of battery it uses.
Interlinked alarms, not just a better battery
The power source is only one part of a compliant system. In a two-storey house, an alarm sounding in the kitchen needs to wake someone on the landing and in the living room as well. That is what interlinking is for, and it can be done with wires or with a wireless radio link between compatible units.
A sealed-battery wireless kit is, for many existing homes, the practical way to meet the standard without running new mains cable. The kit still has to be the right size for the property, and the units still have to be compatible with each other. Mixing brands, or leaving an old standalone alarm in one room, can leave gaps in the interlink.
A competent person can fit many of these wireless kits. Landlords, and anyone who wants the interlink tested and the placement checked, are usually better asking an engineer to do it. That is the work we do from Motherwell, across Wishaw, Newmains and the rest of our patch.
Choosing a kit, or asking us to fit one
We supply and fit WISUALARM wireless kits that use sealed long-life batteries and interlink smoke, heat and, where needed, carbon monoxide alarms. The right pack depends on how many storeys you have and whether there is a boiler, stove or flue.
See the current kits and the “which kit do I need?” guide on our Scottish fire alarm kits page, or book an engineer if you would like Tyger to specify and install the system. You can also call the office.
Further reading (manufacturer explainer, not Tyger copy): WISUALARM UK, 10-year sealed vs replaceable battery smoke alarms, 31 October 2026. Official rules: gov.scot tolerable standard guidance.