Should You Replace a Smoke Alarm After 10 Years?

The answer

Yes. Replace smoke alarms at 10 years unless the manufacturer specifies an earlier replacement requirement for that unit. NFPA recommends replacing all smoke alarms every 10 years, and Kidde states the same interval.

Why

Smoke alarms are not indefinite-life devices. A test button checks certain operating functions at that moment, but it does not extend the service-life recommendation. Date labels and end-of-life signals help identify when replacement is due.

When it is usually OK

• The alarm is 10 years old.
• The manufacturer specifies a 10-year service life.
• The unit gives its documented end-of-life signal.
• The date label shows the replacement interval has been reached.

When you should not

• The device is not actually a smoke alarm and has a different manufacturer-specified service life.
• Local code or the manufacturer requires replacement sooner.
• You are unsure of the age and the device may already be older than 10 years.

Risks and exceptions

• Leaving an over-age alarm in service may mean relying on equipment beyond its recommended life.
• Replacing only the battery can leave an expired alarm in place.
• Removing an old alarm before the replacement is ready can leave an area unprotected.

Best practice

Check the manufacture or replace-by date, obtain the correct replacement alarm, install it according to current instructions, test it after installation, and dispose of the old unit as the manufacturer directs.

Alternatives

• Replace earlier if the alarm malfunctions.
• Use interconnected replacement equipment where required and compatible.
• Ask the manufacturer or local fire authority if the date or installation requirement is unclear.

Frequently asked questions

Related guides