What are the new laws concerning Smoke Alarms?

Every house must have a smoke alarm
The smoke alarm/s do not have to be hard wired (240v power from switchboard) if the customer agrees that the electrician is NOT liable for the owner/tenant not replacing the battery
Smoke alarm batteries are required to be changed annually; Government suggested date is April 1st; although we suggest an easily remembered date such as a birthday or Christmas
Smoke alarms need to be placed within 8m of each other
Smoke alarms are recommended to be installed in every room or just outside doorways for maximum fire protection