Smoke Alarm Maintenance and Testing UK¶

How to maintain and test smoke alarms in UK homes to ensure compliance with BS 5839-6 and maximise fire detection reliability.

Weekly Testing and Monthly Cleaning Schedule¶

BS 5839-6 recommends testing every smoke and heat alarm weekly by pressing and holding the test button until the alarm sounds. This checks the battery, sensor, and sounder are working. If alarms are interlinked, confirm that all units sound. Use a broom handle for ceiling-mounted alarms if you cannot reach. Monthly, vacuum the alarm casing using the soft brush attachment to remove dust that can block the sensor chamber - especially important in UK homes with carpeted halls where dust accumulates. Never use cleaning chemicals or spray polish near alarms. Replace batteries annually unless the alarm has a sealed 10-year lithium battery. Aico and FireAngel alarms typically chirp every 30-40 seconds when the battery is low.

Replacement Schedule and End-of-Life Alerts¶

Smoke alarms must be replaced every 10 years from the manufacture date - not from purchase date. The manufacture date is printed on the side of the unit. After 10 years, sensor sensitivity degrades and the alarm may fail to detect smoke. Heat alarms last slightly longer at 10-12 years. Most modern alarms emit an end-of-life chirp (typically two chirps every 30 seconds) to indicate replacement is due. Replacement cost per unit is £15-£45 for standard alarms. Landlords must document testing, record keeping is mandatory under the Smoke and Carbon Monoxide Alarm Regulations. Keep a logbook of test dates, battery changes, and any false alarm incidents. Test after returning from holiday and after decorating.

Specifications and Comparison¶

Task	Frequency	How To	Cost
Test alarm	Weekly	Press test button until alarm sounds	Free
Vacuum sensors	Monthly	Soft brush attachment on hoover	Free
Replace battery	Annually	Remove old battery, insert new 9V/AA	£2-£5
Replace whole unit	Every 10 years	Check date on side of alarm	£15-£45

FAQ¶

How do I know if my smoke alarm battery is low?: The alarm will chirp or beep every 30-60 seconds. Some models also flash a yellow or red LED to indicate a low battery condition.
Do smoke alarms expire?: Yes - replace all smoke alarms 10 years from the manufacture date printed on the unit. CO detectors expire after 7-10 years.
How often should landlords test alarms in rented properties?: Landlords must ensure alarms are tested at the start of every tenancy and should arrange periodic checks every 6-12 months. For more information see our Interlinked Smoke Alarm System UK.

Last updated: 2026-05-31.

External Resources¶

For further information consult authority guidelines at the Electrical Safety First.