The answer to 'how long does smoke detector last' is that most smoke detectors have a lifespan of 8-10 years. Smoke detectors contain internal components like sensors and batteries that degrade over time, reducing their effectiveness at detecting smoke and fire. It's important to replace smoke detectors every 8-10 years to ensure they are functioning properly and can keep your home and family safe.
Smoke detectors should be tested monthly and the batteries replaced twice a year, even if the detector is hardwired into your home's electrical system. With proper maintenance and timely replacement, smoke detectors can provide reliable early warning of fires for many years.