From 1st January 2017 FOR EXISTING DWELLINGS When replacing smoke alarms, they must be of a photoelectric type which complies with Australian Standard (AS) 3786-2014 Replacing smoke alarms Existing smoke alarms manufactured more than ten years ago must be replaced. (Note: Smoke alarms should have the date of manufacture stamped on them.) Smoke alarms that do not operate when tested must be replaced immediately. Existing hardwired smoke alarms that need replacement must be rep