Smoke alarm regulations in Australia vary by state, and NSW has specific requirements that homeowners, landlords, and tenants need to understand. Getting it wrong doesn't just risk a fine — it risks lives.
What NSW Law Requires
Under the Environmental Planning and Assessment Regulation and the Building Code of Australia, all residential properties in NSW must have at least one working smoke alarm on each level of the home, including any level that contains a garage.
For Existing Homes
- At least one working smoke alarm on every level
- Smoke alarms must be in working condition at all times
- Battery-only alarms are currently acceptable in existing homes (but not best practice)
For New Builds, Renovations & Additions
- Smoke alarms must be hardwired with battery backup
- Alarms must be interconnected — when one triggers, all sound
- Required locations: every bedroom, hallways associated with bedrooms, and each level
- Must comply with AS 3786 (smoke alarm standard)
For Rental Properties
Landlords have additional obligations:
- Smoke alarms must be installed and working at the start of each tenancy
- The landlord is responsible for installation and ensuring compliance
- The tenant is responsible for replacing batteries and not tampering with alarms during the tenancy
- If a tenant reports a faulty alarm, the landlord must have it repaired or replaced promptly
Best Practice (Beyond Minimum Requirements)
The minimum legal requirement is exactly that — the minimum. Fire & Rescue NSW and all major fire authorities recommend going further:
- Photoelectric alarms only — ionisation alarms are still legal but are being phased out. Photoelectric alarms are faster at detecting the slow, smouldering fires that cause most fire deaths
- Hardwired and interconnected in all homes, not just new builds
- Alarms in every bedroom, not just hallways — a closed bedroom door can delay smoke reaching a hallway alarm by critical minutes
- 10-year sealed lithium batteries — eliminates the dead-battery problem entirely
Smoke Alarm Placement
- On the ceiling, at least 300mm from any wall or corner
- Not in or near kitchens (at least 3m away from cooking appliances to avoid nuisance alarms)
- Not in bathrooms or high-humidity areas
- Not near air conditioning vents or fans that could blow smoke away from the sensor
- In hallways, place between the bedroom doors and the rest of the house
Testing and Maintenance
- Test monthly by pressing the test button
- Replace batteries annually (unless sealed 10-year type)
- Replace the entire alarm every 10 years — check the manufacturing date on the back
- Vacuum the sensor gently once a year to remove dust that can cause false alarms or reduce sensitivity
Need smoke alarms installed or tested? Randwick Electrical installs hardwired, interconnected photoelectric systems across Sydney's Eastern Suburbs. Call 0413 707 758.