Smoke Alarm Rules for South Australian Homes
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Every South Australian home must have a working smoke alarm. Homes approved on or after 1 January 1995 need alarms hard-wired to the 240 volt mains, while older homes need at least a replaceable-battery alarm. When a house changes hands on or after 1 February 1998, the new owner has six months from the title transfer to fit mains-powered alarms or alarms with sealed 10-year batteries.
Over 100 jobs for home owners in the 12 months to October 2026 involved a smoke alarm.
The basic rule
The SA Government smoke alarms page (sa.gov.au) says every South Australian home must have a working smoke alarm, and that home owners are responsible for making sure alarms work and are installed correctly. The South Australian Metropolitan Fire Service (MFS) smoke alarm legislation fact sheet says one or more alarms must be installed in every dwelling, placed so that people in sleeping areas get reasonable warning to get out safely.
The sa.gov.au page adds that fines apply if alarms are not installed. The MFS fact sheet does not mention fines. Both pages were read on 30 October 2026, and rules can change, so check them or ask us before you rely on this guide for a decision.
Older homes and newer homes
The two sources frame the age rules a little differently. The MFS looks at when the building was approved. The SA Government page looks at when you bought the property, plus the date the home was built.
- MFS: homes with building approval before 1 January 1995 need, as a minimum, a smoke alarm powered by a replaceable battery.
- MFS: from 1 January 1995, alarms must be hard-wired to the 240 volt mains power supply unless the home is not connected to mains power. The fact sheet says alarms should also be fitted with a back-up battery.
- SA Government: if you bought the property before 1 February 1998, you must fit a replaceable-battery alarm.
- SA Government: homes built from 1 January 1995 need a 240 volt mains-powered alarm under the Building Code of Australia.
A home that is not connected to mains power can use alarms with a 10-year, non-replaceable, permanently connected battery, according to the MFS.
If you have bought or are buying a house
Both sources describe a change-of-ownership rule that applies from 1 February 1998. The new owner has six months from the date the title is transferred to fit the right number of alarms. Those alarms must be either mains-powered (hard-wired) or sealed battery alarms with a 10-year life that cannot be removed or replaced.
If you are buying, it is worth asking the seller what alarms the home has now, so you know what may need doing after settlement. If you are selling, our guide to certificates of compliance explains the paperwork that can go with electrical work.
Interconnected alarms
Interconnected means that when one alarm sounds, they all sound. The MFS says that from 1 May 2014, alarms must be interconnected in new homes. In an existing home, extensions approved after that date must have alarms that interconnect with each other, but not with the alarms in the original part of the house. The SA Government page also says new dwellings, additions and extensions need interconnected alarms.
Even where it is not required, linked alarms can help in a larger house or one with bedrooms on different levels. We can talk through options on our smoke alarm installation page.
Who can fit them
Fitting or replacing a mains-connected alarm is electrical work. In South Australia that must be done by a licensed electrician, and it is not something to try yourself. Plug-in-base and battery alarms are simpler to look after, but the 10-year sealed type should be replaced as a whole unit when it reaches the end of its life.
If you are not sure what is in your home or whether it meets the rules above, ask us. We can look at what is fitted and explain what would bring it up to standard.
Keeping alarms working
- Test them regularly using the test button.
- Replace batteries as the maker advises, and replace the whole alarm when it reaches the end of its life. The date is usually printed on the back.
- Do not paint over or remove an alarm. Dust and insects can also stop one working, so clean it as the instructions say.
If an alarm keeps chirping, our guide to why a smoke alarm is beeping explains the common causes and the safe way to deal with them.
Sources and when to call us
Sources: SA Government, Smoke alarms page (sa.gov.au, last updated 2 June 2023 per the page), and the South Australian Metropolitan Fire Service (MFS) Smoke Alarm Legislation fact sheet (mfs.sa.gov.au), both read on 30 October 2026.
Call Hoile Electrical on 0482 099 388 and we will tell you what is involved. We are available 24 hours, 7 days. Our SA electrical licence number is PGE 229 469.
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Common questions
Do I need hard-wired smoke alarms?
If your home was approved on or after 1 January 1995, yes, unless it is not connected to mains power, according to the MFS. Older homes need at least a replaceable-battery alarm, but a new owner on or after 1 February 1998 must fit mains-powered or sealed 10-year alarms within six months of title transfer.
What is a 10-year battery alarm?
It is an alarm with a sealed battery that is permanently connected, designed to last the life of the alarm. The battery cannot be removed or replaced.
Do alarms have to be linked together?
In new homes, additions and extensions, yes. The MFS says that since 1 May 2014 extensions must interconnect with each other, though not with the original alarms.
Who is responsible after I buy a home?
The new owner. Both the MFS and the SA Government say you have six months from the title transfer to fit the correct alarms.
Are there fines for not having smoke alarms?
The SA Government smoke alarms page says fines apply if alarms are not installed. The MFS fact sheet does not mention fines.
Can I fit a hard-wired alarm myself?
No. Mains-connected alarms must be installed by a licensed electrician in South Australia.
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