Do smoke alarms have to be hard wired in nsw

In NSW, hard-wired smoke alarms are generally required for new builds or major renovations (post-1997), while older homes (pre-1997) can use battery alarms but are encouraged to upgrade, with all dwellings needing alarms on every level, interconnected where possible, and complying with AS 3786, with landlords responsible for installation/maintenance in rentals.

For Newer Homes & Renovations (Built after August 1, 1997):

Hard-wired 240-volt smoke alarms with a battery backup are required.
These should be interconnected, meaning if one sounds, they all sound.
Installation must be done by a licensed electrician.

For Older Homes (Built before August 1, 1997):

You can use 9-volt battery-powered smoke alarms, but upgrading to hard-wired is strongly recommended for better safety.

General Requirements (All Homes):

Location: At least one alarm on every level, including hallways leading to bedrooms, and in any other storey.
Type: Must comply with Australian Standard AS 3786.
Interconnection: Fire authorities highly recommend interconnecting all alarms (wired or wirelessly).

For Rental Properties:

Landlords must install compliant alarms.
For older properties, landlords can choose between hard-wired or 10-year sealed battery alarms, but must maintain them.
Key Takeaway: While older homes have some flexibility, hard-wired and interconnected systems offer superior protection and are the standard for new construction in NSW, with Fire & Rescue NSW strongly recommending them across the board.