How Often Should Smoke Alarms Be Tested and Replaced?

Smoke alarms only work if they're actually functional when you need them, which means testing and replacement schedules matter more than most homeowners realise.

Testing

Test every smoke alarm monthly using the test button, and replace batteries at least once a year (unless it's a 10-year sealed battery unit). This is a simple, five-minute job worth putting a reminder in your calendar for.

Full replacement

Smoke alarms should be replaced entirely every 10 years, even if they still seem to work. The sensors inside degrade over time and become less reliable well before they stop functioning altogether.

Rental property rules

Rental providers in Victoria are required to test alarms at least once every 12 months in line with the manufacturer's instructions, and mandatory annual safety checks now apply to all rental properties. Renters shouldn't remove or interfere with alarms but can replace batteries themselves.

Signs it's time for a check

• You're not sure when the alarms were last tested or replaced
• An alarm chirps intermittently (usually a low battery warning)
• The property was built or last had alarms fitted more than 10 years ago