Most people know they need smoke alarms. Fewer people know what the rules in NSW actually say, or whether the alarms already on their ceiling would pass a close look. This guide sets out the basics for owner-occupiers around Shellharbour, Wollongong and Kiama, without the legal jargon.

The core rule in NSW

NSW law requires every home to have working smoke alarms on every level. That applies whether you own the home, rent it out or live in it yourself. It covers houses, townhouses, units, granny flats and other places people sleep. A home with a downstairs rumpus room and an upstairs bedroom area needs alarms on both levels, not just one near the kitchen.

The alarms need to meet the Australian Standard for smoke alarms, AS 3786. Any alarm sold by a reputable supplier in Australia should be marked with it. If an alarm in your house has no markings left, or you cannot read the label, that is usually a sign it is old enough to replace anyway.

Working means working

The rule says working smoke alarms, not just smoke alarms. A unit with the battery pulled out because it went off while you were cooking does not count. Neither does a hard wired alarm that has been chirping for months, or one painted over during a renovation.

For homeowners, that means a bit of routine care:

Press the test button on each alarm every month or so and make sure you can hear it from the bedrooms.
Replace batteries in battery-powered alarms when they chirp or at least once a year, unless the alarm has a sealed long-life battery.
Vacuum gently around the vents to clear dust and insects.
Replace the whole alarm once it reaches the end of its life. Most manufacturers say ten years.

Where alarms should go

The minimum is one on each level, but the minimum is rarely the best setup. Fire and Rescue NSW recommends alarms in every bedroom, in hallways outside sleeping areas and in living areas. Many older Illawarra homes, especially the 1960s and 70s brick and fibro houses around Warilla and Barrack Heights, were built with a single alarm in the hallway, if any. That is often not enough to wake someone sleeping with a door closed.

If you want more detail on spacing and positions, our smoke alarm placement guide walks through it room by room.

Photoelectric or ionisation

There are two common sensing types. Ionisation alarms react quickly to flaming fires but are prone to nuisance alarms from toast and steam. Photoelectric alarms are better at picking up the slow, smoky fires that tend to start at night. Fire and Rescue NSW recommends photoelectric alarms for homes, and that is what we fit as standard.

Building or renovating changes things

If you are building a new home, adding an extension or doing significant renovation work, the building approval will generally require hard wired smoke alarms, and in many cases interconnected alarms, installed by a licensed electrician. Your builder or certifier will tell you what applies to your plans. Hard wiring is electrical work, so it must be done by a licensed electrician in NSW.

Even if your renovation does not trigger the requirement, it is a good moment to upgrade. With ceilings open or walls being patched, running cable between alarms is simpler and tidier.

Selling your home

When you sell, buyers and their inspectors will usually check that alarms are present and working. Having current, compliant alarms on every level avoids an awkward item on the pre-purchase report and gives the new owners a safe start.

How Flowstate can help

Kalani installs and replaces battery, hard wired and interconnected smoke alarms across the Illawarra. He will check what you have, tell you plainly what needs changing and what can stay, and test every alarm before he leaves. If the job turns up other issues, like an old switchboard without safety switches, he will explain them without pressure.

Not sure where your home stands? Call or text Kalani on 0424 400 346. Photos of your current alarms and the labels on them are welcome and help us give you a clear answer quickly.

NSW smoke alarm rules for homeowners