SMOKE DETECTORS AND CO ALARMS : WHO PAYS ? s.sdcpm.com/smokectt

If a smoke detector or carbon monoxide alarm was installed when you moved in and is now MISSING, or if it was DAMAGED (excluding if due to defect in the detector/alarm itself, ie anything that the supplier's warranty would not cover) you will be charged the cost that will be pro-rated for an expected life of 10 years  (see source at LINK)