In 2011, a house fire in Slacks Creek, Queensland claimed 11 lives, including eight children. That tragedy led to Queensland's staged smoke alarm reforms, and the final stage landed on 1 January 2027. From that date every Queensland home must have interconnected photoelectric smoke alarms in the right places.
Around 4,400 Australians search for "smoke alarm" each month, and many are now asking the same thing: what type do I need, and does my house comply? This guide explains photoelectric alarms, interconnection and the rules across Australia.
TL;DR:
Photoelectric smoke alarms detect the slow, smouldering fires that cause most fatal home fires, and they are now the recommended or required type across Australia. Queensland requires interconnected photoelectric alarms (AS 3786-2014) in every bedroom, hallway and storey of all homes by 1 January 2027. Other states have their own rules, especially for new builds, sales and rentals. Hardwired alarms must be installed by a licensed electrician. Replace any alarm more than 10 years old.
Photoelectric vs ionisation: what's the difference?
|
Feature |
Photoelectric |
Ionisation |
|---|---|---|
|
How it detects |
Light beam scattered by visible smoke particles |
Tiny radioactive source detects changes in ion flow |
|
Best at |
Slow, smouldering fires (couches, bedding, wiring) |
Fast, flaming fires |
|
False alarms from cooking |
Fewer |
More common |
|
Status in Australia |
Recommended by fire services; required in QLD |
Being phased out of recommendations |
Most fatal home fires start slowly at night, producing smoke long before flames. Photoelectric alarms respond to that visible smoke earlier, which is why fire authorities recommend them.
What are interconnected smoke alarms?
Interconnected alarms talk to each other. When one detects smoke, every alarm in the house sounds. That matters in a double-storey home: a fire in the downstairs lounge wakes the kids upstairs at the same moment.
There are two ways to interconnect:
-
Hardwired: alarms run on 240V mains with a backup battery and are connected by cable. Installation requires a licensed electrician.
-
Wireless (RF): alarms communicate by radio. Many run on sealed 10-year lithium batteries and can be installed without rewiring.
Around 1,000 Australians search "interconnected smoke alarms" every month, a number that keeps climbing as the Queensland deadline nears.
Smoke alarm rules by state (summary)
|
State / territory |
Key requirement (summary) |
Official source |
|---|---|---|
|
QLD |
All homes: interconnected photoelectric alarms in every bedroom, hallways and every storey by 1 January 2027; already required when selling or leasing |
|
|
NSW |
At least one working smoke alarm on every level; landlords must maintain alarms |
NSW Fair Trading / Fire and Rescue NSW |
|
VIC |
Alarms on every level; new homes need hardwired interconnected alarms; rental minimum standards apply |
Fire Rescue Victoria / Consumer Affairs Victoria |
|
WA |
Mains-powered alarms required before a home is sold, rented or hired out (10-year battery alarms allowed in limited cases) |
|
|
SA, TAS, ACT, NT |
Requirements for new builds, sales and rentals; check your fire authority |
State fire services |
This is a summary only. Rules change, and requirements differ for new builds, renovations, sales and rentals. Always confirm with your state fire authority before buying.
Queensland's 2027 checklist
The Queensland Fire Department says alarms must:
-
Be photoelectric and comply with AS 3786-2014.
-
Be interconnected so all alarms activate together.
-
Be installed in every bedroom.
-
Be installed in hallways connecting bedrooms to the rest of the home.
-
Be installed on every storey (in the exit path if there are no bedrooms on that level).
-
Be less than 10 years old and tested at least every 12 months.
If a ceiling mount is not practical, the alarm can go on a wall between 100mm and 300mm from the ceiling and more than 300mm from a corner.
Hardwired vs 10-year battery alarms
|
Factor |
Hardwired (240V + backup) |
10-year lithium battery (wireless) |
|---|---|---|
|
Installation |
Licensed electrician required |
DIY-friendly, no wiring |
|
Interconnection |
Wired or wireless module |
Wireless RF |
|
Replacing existing hardwired? |
Required (replace like for like) |
Generally not a substitute for hardwired |
|
Battery changes |
Backup battery only |
None for 10 years, then replace unit |
|
Best for |
New builds, renovations, existing hardwired homes |
Existing homes without hardwired alarms, rentals |
The golden rule: if your home already has hardwired alarms, replacements must be hardwired too. Do not remove a hardwired alarm and stick up a battery one.
How many smoke alarms does my home need?
For a Queensland-compliant 3-bedroom single-storey home, expect around five alarms: one per bedroom, one in the hallway and one near the living area exit path. A 4-bedroom double-storey home often needs seven or more. Other states usually need fewer by law, but following the Queensland standard is a sensible benchmark anywhere.
Smoke alarms and your security system
Smoke alarms protect people inside the home. Some alarm panels can also monitor compatible smoke detectors and send alerts to your phone when nobody is home. If you already have a Bosch, Hikvision AX PRO or Ajax alarm, ask us which detectors integrate. Our home alarm systems buying guide explains how panels and detectors work together, and you can browse alarm kits for monitored protection. Panel-connected detectors complement, but do not replace, legally required smoke alarms.
Maintenance checklist
-
Test every alarm monthly using the test button.
-
Vacuum or dust the vents every six months.
-
Check the manufacture date; replace alarms older than 10 years.
-
Replace backup batteries in hardwired alarms as directed (if not sealed lithium).
-
Never paint over an alarm or cover it.
Frequently asked questions
Are photoelectric smoke alarms mandatory in Australia?
They are mandatory in Queensland and recommended by fire services nationally. Other states set different requirements for new builds, rentals and sales.
Do I need an electrician to install smoke alarms?
You need a licensed electrician for hardwired (240V) alarms. Wireless 10-year battery alarms can usually be installed by the homeowner.
Can I mix different brands of interconnected smoke alarms?
Generally no. Interconnection, especially wireless, usually only works between compatible models from the same brand. Check before buying.
How long do smoke alarms last?
About 10 years. Replace any alarm past its manufacture date plus 10 years, even if it still beeps when tested.
Where should smoke alarms not be installed?
Avoid kitchens, bathrooms and near air conditioning vents or ceiling fans, where steam, cooking fumes and airflow cause false alarms or delay detection.
Get compliant before the deadline
If you are in Queensland, 1 January 2027 is close. Count your bedrooms, check your existing alarm type, and book an electrician early if you have hardwired alarms.
Shop photoelectric smoke detectors and talk to us about integrating smoke detection with your alarm system.
