Can I install a hardwired smoke alarm myself?
Short answer
Not a hardwired one. Mains-powered (hardwired) smoke alarms connect to fixed wiring, so they must be installed or replaced by a licensed electrician in every Australian state and territory. Battery-only alarms, including photoelectric alarms with a 10-year non-removable battery, aren't connected to the wiring, so you can fit and replace those yourself. Check your state's smoke alarm rules too: Queensland, for example, requires interconnected photoelectric alarms in every home by 1 January 2027.
Smoke alarms come in two kinds, and the rules follow the wiring: if it’s connected to your home’s fixed wiring, it’s an electrician’s job. If it runs on a battery alone, it’s yours.
The rules
| Type of alarm | Install or replace it yourself? |
|---|---|
| Hardwired (240 V mains, usually with a backup battery) | Licensed electrician, every state |
| Battery-only, including 10-year sealed battery alarms | DIY OK, every state |
How to tell which you have: twist the alarm off its base. If there’s a plug or wires going into the ceiling, it’s hardwired. If the base is just screwed to the ceiling, it’s battery-only.
Check your state’s smoke alarm law as well
Being allowed to fit an alarm isn’t the same as meeting your state’s rules for which alarms your home needs. The rules differ, especially for rentals and homes being sold.
- Queensland: by 1 January 2027 every home needs photoelectric alarms that are interconnected (when one sounds, they all sound), in every bedroom, hallways connecting bedrooms to the rest of the home, and on every storey. Alarms powered by a 10-year non-removable battery can be installed yourself; hardwired alarms need an electrician. Read the full Queensland smoke alarm guide.
- Other states: check your fire service’s smoke alarm page, particularly before renting out or selling.
What you can do yourself
- Test every alarm monthly by pressing and holding the test button.
- Vacuum the vents gently every six months to keep dust out of the sensor.
- Replace battery-only alarms when they reach their expiry date (usually printed on the back), or when they chirp and a new battery doesn’t fix it.
- Replace the backup battery in a hardwired alarm, if the manufacturer’s instructions allow it, without disconnecting the wiring.
When to call an electrician
- Replacing a hardwired alarm, or adding one
- Interconnecting alarms using wiring
- A hardwired alarm that keeps false-alarming or won’t stop chirping after a new backup battery
If your home needs several alarms replaced at once, ask for one quote covering all of them. A clear list of rooms and photos of each alarm helps an electrician price it without a site visit.
Sources
Every rule on this page is taken from these official sources. If a rule has changed, please tell us and we’ll fix it.
This guide is general information, not legal or professional advice. Rules differ between states, councils and individual properties, and they change. Confirm with your state regulator or council before starting work, and if in doubt, get a licensed tradesperson.