Smoke Alarm Installation Adelaide
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A hardwired smoke alarm runs off your home's mains power, with a battery as backup. Interconnected alarms are linked, so when one sounds they all sound. A licensed electrician fits them to the ceiling and tests the whole set. Call us and we will tell you what suits your house.
Smoke alarms are a regular job for home owners: over 100 jobs in the 12 months to October 2026 involved smoke alarms.
Hardwired and interconnected alarms explained
A battery-only alarm works on its own and needs a new battery now and then. A hardwired alarm connects to your home's wiring, so it keeps working without regular battery changes, and has a backup battery for power cuts.
Interconnected alarms talk to each other. If a fire starts in the kitchen while you are asleep upstairs or at the back of the house, every alarm sounds, not just the one nearest the smoke. That extra warning time is the main reason people choose them.
Alarms also differ in how they detect smoke. The SA Metropolitan Fire Service (MFS) recommends well-maintained photoelectric smoke alarms that are less than 10 years old, and suggests having all your alarms interconnected. Check the date printed on any alarm you already have, and ask us which type we would fit and why.
Signs it is time to replace or add alarms
- Your alarms are old, yellowed or you cannot find a date on them.
- They chirp, beep or false alarm even with fresh batteries.
- You have only one alarm for the whole house.
- There is no alarm near the bedrooms or on each level.
- You are renovating, adding a room or having new ceilings fitted.
Alarms do not last forever. Most have a use-by date printed on the back. If you cannot read one, or it has passed, replace the alarm. If an alarm keeps chirping, our guide on why a smoke alarm beeps covers the usual causes.
What the installation involves
- We walk through the house and agree where alarms should go, such as hallways, bedrooms and each level.
- Power to the circuit is switched off for safety.
- Alarms are fitted to the ceiling and wired in, and linked together if you want them interconnected.
- We test each alarm and the whole network, and show you the test button.
- Power is restored and we tidy up.
If the ceiling is hard to reach or the roof space is tight, the job can take longer. We will tell you what to expect when we see the house.
Where a cable run is difficult, we will explain the options before we start so nothing surprises you.
Where alarms should and should not go
Alarms work best in hallways outside bedrooms and on each level of the home. Keep them away from the kitchen stove and bathroom steam, which cause false alarms. We will place them for the layout of your house and talk through the options before we start.
Cooking fumes are a common cause of false alarms. Some homes add a heat alarm in the kitchen, which reacts to a rise in temperature rather than smoke. A heat alarm is an extra, not a replacement for the smoke alarms your home needs.
Safety and compliance
Hardwired alarm work must be done by a licensed electrician. Hoile Electrical holds SA electrical licence PGE 229 469.
The rules on the type and number of alarms depend on when the building was approved and when the home last changed hands. They are set out in the next section. If you are not sure which applies to your home, ask us and we will make sure what we fit suits it.
South Australian smoke alarm rules in brief
The SA Government says all South Australian homes must be fitted with a working smoke alarm, and that home owners are responsible for making sure the alarms work and are installed correctly. The main rules, from the SA Government smoke alarms page and the Metropolitan Fire Service (MFS) smoke alarm legislation fact sheet, depend on dates:
- Buildings approved before 1 January 1995: at least a smoke alarm powered by a replaceable battery.
- Buildings approved on or after 1 January 1995: alarms must be hard-wired to the 240 volt mains power supply, unless the dwelling is not connected to mains power. A backup battery is also recommended.
- Homes bought before 1 February 1998: a replaceable-battery alarm is the minimum.
- Homes bought on or after 1 February 1998: the new owner must fit alarms within six months of the title transfer. They must be either 240 volt mains-powered, or alarms with a 10-year, non-removable battery that are permanently connected.
- New homes, and extensions approved after 1 May 2014: alarms must be interconnected, so when one sounds they all do. In an extension, they are interconnected with each other but not with alarms in the existing part of the house.
- Number and position: every home needs one or more alarms, placed where they give reasonable warning to people who are asleep. A larger or multi-level home may need more than one.
Alarms must also meet Australian Standard 3786, which is shown on the packaging. The SA Government page states that fines apply if alarms are not installed.
These rules change from time to time and the pages we checked on 30 October 2026 do not cover every situation, so ask us if your home does not fit neatly into one of the groups above. For more detail see our guides on the smoke alarm rules for SA homes and why a smoke alarm keeps beeping.
What to ask your electrician
- Will the alarms be hardwired and interconnected?
- How many do I need and where will they go?
- Do they have a backup battery?
- Will you test them and show me how?
- What does your workmanship guarantee cover?
When to call us
Call us if you want your home protected properly or your alarms keep chirping. If you smell smoke or see fire, get everyone out and call 000 first. Then call Hoile Electrical on 0482 099 388 once everyone is safe.
Once the alarms are in, press the test button regularly, and replace alarms when they reach the end of their life.
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Our Reviews
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Fast, detailed and reliable workers! Eased my mind about concerns and were kind to my children when they were being annoying!
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Excellent service! Professional, efficient, and neat work. Very happy with the installation. Highly recommended!
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Hoile Electrical arranged an electrician very quickly to review my smoke alarms. Ross was very friendly, efficient and helpful. Much appreciated and will definitely call them for electrical issues again.
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Gerad arrived on time.spent a lot of time explaining the process of improving our air conditioning,would recommend him for your air conditioning needs, Craig
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Hoile Electrical were recommended to us and we can see why. Very quick and efficient service by James and Nathan. Excellent communication all the way through. The whole experience was faultless.
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Very professional and good at what they do.
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Common questions
What is the difference between hardwired and battery smoke alarms?
Hardwired alarms run off your home's mains power with a backup battery. Battery-only alarms rely entirely on batteries that need replacing.
What does interconnected mean?
The alarms are linked, so if one detects smoke every alarm in the house sounds.
Why does my smoke alarm keep beeping?
Usually a low battery or an alarm near the end of its life. Steam and dust can also set one off. If it continues, have it checked.
Can I replace a hardwired smoke alarm myself?
No. Hardwired alarms connect to mains wiring, which must be done by a licensed electrician.
How many smoke alarms does my home need?
It depends on your home's size and layout. We will tell you what we recommend when we see the house.
Do I have to have hardwired smoke alarms?
It depends on the age of the building and when it was bought. Buildings approved on or after 1 January 1995, and homes bought on or after 1 February 1998, need mains-powered (or 10-year sealed battery) alarms. Older homes need at least a replaceable-battery alarm. Ask us and we will check your home.
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