In the UK, smoke detectors required for new build and rental homes are generally mains powered, interconnected alarms with battery backup. Specifically, the regulations outlined in BS5839-6 generally require at least one smoke alarm on each floor of a home, which should be interconnected via hardwiring or radio frequency. While the regulations do not explicitly prohibit the use of battery-powered alarms, it is recommended that they be mains powered with battery backup. Landlords may also choose to install alarms with tamper-resistant, sealed or long-life lithium batteries.
Here is a more detailed explanation from anka security:
Battery-backed power supply:
This is the most common and recommended type of smoke alarm for new build and rental properties.
Interconnected:
The alarms should be interconnected via hardwiring or a wireless system so that when one alarm is activated, all the alarms in the home will sound.
Location:
Smoke alarms are generally required in hallways and stair landings, as well as any room used as a living room.
Heat alarms:
It is recommended that heat alarms be used in kitchens instead of smoke alarms to reduce false alarms.
Carbon Monoxide Alarms:
Carbon Monoxide alarms are mandatory in rooms with fuel burning appliances such as gas stoves or boilers and solid fuel appliances such as wood burners.
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