Smoke Alarm Placement Guide for Australian Homes

1. Count your bedrooms first.
   Each bedroom needs its own alarm mounted inside it — not in the doorway, not in the corridor outside. Inside the room, on the ceiling. A standard 3-bedroom home needs at least 3 bedroom alarms before you've even thought about hallways.
2. Identify your hallways.
   Any hallway or corridor that connects bedrooms to the rest of the dwelling needs an alarm. In most Toowoomba homes — particularly the older Queenslanders in Newtown and Rangeville with long central hallways — one alarm in the middle of that hallway typically covers the requirement. If the hallway is particularly long, you may need two.
3. Check your storeys.
   Every level of the home needs coverage. In a two-storey home, that usually means a hallway alarm on each floor. For a Queenslander with an enclosed lower level, that enclosed space counts as a separate storey and needs its own alarm — this catches a lot of people out.
4. Mount alarms on the ceiling, centred where possible.
   Ceiling mounting is preferred. If you must use a wall, mount the alarm between 300mm and 500mm from the ceiling — not flush against the cornice where dead air zones form.
5. Keep alarms away from kitchens and bathrooms.
   Steam from showers and cooking fumes are the number one cause of nuisance alarms. Maintain a minimum of 300mm clearance from any cooking appliance and keep alarms well away from bathroom doorways. The legislation does not require alarms in kitchens — and for good reason.
6. Stay clear of air vents and ceiling fans.
   Airflow from ducts and fans disrupts smoke travel and can prevent an alarm from detecting a fire in time. Keep at least 300mm clearance from any air vent, return air grille, or ceiling fan blade.
7. Test interconnection before you're done.
   Press the test button on one alarm. Every other alarm in the house must sound within a few seconds. If any alarm fails to respond, the system is not compliant — regardless of how well each unit is individually positioned.

For homes with open-plan layouts — common in newer Glenvale and Highfields estates — there's no formal hallway separating bedrooms from the living area. In that case, position the alarm between the bedroom wing and the main living space. The intent of the law is to ensure occupants sleeping in bedrooms are alerted early. Place it accordingly.

For two-storey homes, don't overlook the lower level. If there's a living area, garage conversion, or media room downstairs with no bedrooms, you still need an alarm on the path to exit — typically near the base of the staircase or at the bottom landing.

Our winter heating season is worth a mention here too. Toowoomba regularly drops near zero overnight between June and August. Wood heaters, gas heaters, and electric bar heaters see heavy use — and they're all legitimate fire sources. An alarm positioned correctly in a bedroom will give an occupant time to respond. One tucked in a corner well away from the door won't. Position matters as much as compliance.

Battery-operated wireless alarms can legally be installed by a homeowner in Queensland. But if you have any hardwired alarms — or if you want hardwired alarms installed — that work must be done by a licensed electrician under the Electrical Safety Act 2002, and a Certificate of Compliance must be issued.

Beyond the legal requirement, a proper placement assessment takes experience. Getting it wrong doesn't just risk a fine (up to $834.50 per offence under current penalty unit rates). It risks not waking up in time.

If you're in Toowoomba or the Darling Downs and you want the placement done correctly — first time, fully compliant — call us on 0494 652 176. We'll assess your home, confirm what's required under current QLD legislation, and install a compliant interconnected system you won't have to think about again.