Smoke Alarm Requirements in NSW: What Sellers Need to Know
One working alarm on every level is the whole legal bar. Here’s what the law actually requires, what goes wrong if you ignore it, and what doesn’t.
Smoke alarms come up on almost every seller call, usually as a quick “is there anything we need to do about them?” The honest answer is that the legal bar is low, but it’s non-negotiable, and every NSW contract for sale carries a warning notice about it whether your alarms comply or not. Here’s what the law actually requires and what it means for your sale.
At a glance
- NSW law requires at least one working smoke alarm on every level of the home, in any building where people sleep.
- Alarms must comply with Australian Standard AS 3786.
- Not complying is an offence, with a maximum penalty of $550.
- Every contract carries a standard smoke alarm warning notice (page 5 of the 2026 edition). It’s a general legal notice, not a statement about whether your particular alarms comply.
- An existing council fire safety order is different: under clause 11 that becomes yours to fix before settlement.
- If you’re selling a tenanted property, landlord obligations since March 2020 go well beyond the base requirement: annual checks, repairs within 2 business days, and replacement every 10 years.
What NSW law actually requires
The rules now live in Part 13 of the Environmental Planning and Assessment (Development Certification and Fire Safety) Regulation 2021, made under section 6.34 of the Environmental Planning and Assessment Act 1979. Sections 95 to 98 set out where alarms must go for each building class, and section 99 requires them to meet Australian Standard AS 3786. At least one working alarm must be installed on each level of any building in NSW where people sleep. That covers houses, units, townhouses, granny flats, manufactured and relocatable homes, and caravans and campervans used as accommodation.
You’ll still see older material citing “section 146A” and the Environmental Planning and Assessment Regulation 2000. Those references were renumbered and replaced, though the substance of the obligation hasn’t changed.
These provisions have applied since 1 May 2006. It’s an offence not to comply, and a separate offence to remove or interfere with an installed alarm except to maintain, repair or replace it. The maximum penalty if it goes to court is $550, though in practice NSW relies mostly on education rather than random home inspections to enforce it.
Where alarms need to go
The legal minimum is one working alarm per level, wherever people sleep. Fire and Rescue NSW recommends going further than the bare minimum: an interconnected alarm in every bedroom and every living area, including hallways and stairways, and even the garage. Alarms are normally fitted to the ceiling, in the hallway outside bedrooms and on any landing.
More alarms is always fine. Fewer than one per level isn’t.
A common myth
You’ll sometimes hear that NSW alarms must be photoelectric and interconnected, or that there’s a 2027 deadline coming. That’s Queensland’s law, not New South Wales’s. NSW has no mandatory upgrade timeline and no rule requiring photoelectric-only alarms. Fire and Rescue NSW recommends interconnected, hardwired alarms as best practice, but the legal minimum here is simpler: AS 3786 compliant, at least one per level, working.
Hardwired or battery, does it matter?
NSW regulations don’t specify whether an alarm must be hardwired or battery powered, as long as it meets AS 3786. Fire and Rescue NSW’s best practice recommendation is hardwired and interconnected wherever possible, and this is worth considering if a property is being rewired anyway. Where hardwiring isn’t practical, FRNSW recommends alarms that run on 10 year lithium batteries rather than ones needing a battery change every year.
“The legal bar for smoke alarms is low. Getting caught out because nobody checked is the part that’s avoidable.”
What actually happens if your alarms don’t comply
This is where we correct something people often get told. Non-compliant alarms are a fire-safety offence carrying a fine, not a reason your buyer can walk away from the sale.
The smoke alarm warning notice is item 16 in Schedule 1 of the Conveyancing (Sale of Land) Regulation 2022, which makes it one of the prescribed documents. In the 2026 edition of the standard contract it’s printed on page 5, under “Important notice to vendors and purchasers”, alongside the loose-fill asbestos warning. The regulation says the separate attachment requirement doesn’t apply where the notice is printed in the contract, which is how the standard form handles it.
It’s boilerplate that appears in every NSW sale. It doesn’t ask you to declare whether your particular alarms comply, and there’s no smoke alarm item anywhere in the contract’s List of Documents.
The regulation that used to require sellers to make that kind of compliance statement was repealed back in 2006, along with the buyer’s ability to rescind over an inaccurate one. The vendor’s prescribed warranty covers things like adverse affectations and matters that would justify an upgrading or demolition order. A fire safety order sits outside that definition, so smoke alarms aren’t a breach-of-warranty issue either.
What does matter is that the notice itself is there. If the warning notices are neither printed in the contract nor attached to it, that’s a failure to provide the prescribed documents, and the buyer can rescind within 14 days of the contract being made. We check that on every file, so it’s not something you need to chase.
And the alarms still matter in their own right. If council or Fire and Rescue NSW ever does look into it, the offence and the penalty are real. It just isn’t the buyer’s lever to unwind your sale.
The one case where it does hit your contract
There’s a scenario worth knowing about, and it isn’t the one people worry about. Clause 11 of the standard contract says the vendor must comply, by completion, with any work order made on or before the contract date. A work order is defined broadly: a valid direction, notice or order requiring work to be done or money spent on the property.
So if council or Fire and Rescue NSW has already issued a fire safety order over your alarms before you sign, that becomes your obligation to fix at your cost before settlement. Orders made after the contract date pass to the buyer instead.
That’s a live order, though, not a quiet non-compliance nobody has acted on. If you’ve received anything in writing from council about fire safety, tell us before the contract is drafted.
Selling a tenanted property
If you’re selling an investment property with tenants in place, the landlord obligations sit well above the base requirement. The rules changed on 23 March 2020, and they’re stricter than most owners realise. As landlord you must:
- Check every smoke alarm at least once a year to confirm it’s working
- Repair a non-working alarm, including replacing a flat battery, within 2 business days
- Replace every alarm within 10 years of its manufacture date, or sooner if the manufacturer says so
- Replace batteries annually, or within the period the manufacturer specifies for lithium batteries
- Give at least 2 business days’ notice to inspect alarms, and at least 1 hour’s notice to carry out a repair or replacement
Tenants must tell you when an alarm stops working. There are limited situations where a tenant can change a battery or arrange a repair themselves, and NSW Fair Trading sets those out.
None of this changes at the point of sale. Whoever owns the property when a fire happens carries the obligation, so it’s worth confirming the alarms are in order before you list rather than leaving it for the new owner to discover.
Common questions
Are smoke alarms required to sell a home in NSW?
Yes. The requirement applies to owner-occupied homes, rental properties, relocatable homes, caravans and camper-vans, and any other residential building where people sleep, whether or not it’s about to be sold.
How many smoke alarms do I need?
At least one working alarm on each level of the home. A single-storey house needs one minimum; a two-storey house needs at least one on each floor.
Do smoke alarms need to be hardwired in NSW?
No. NSW law doesn’t mandate hardwired alarms, though Fire and Rescue NSW recommends hardwired and interconnected alarms as best practice where that’s achievable.
Are battery smoke alarms legal in NSW?
Yes, as long as they comply with AS 3786. FRNSW’s advice is to use 10 year lithium battery alarms rather than ones needing an annual battery change.
The short version
Check every level of the home has at least one working AS 3786 alarm before you list. That’s the legal bar, and it’s an easy one to clear. The smoke alarm warning notice is part of the standard contract, so there’s nothing extra for you to arrange there. If the property is tenanted, your landlord obligations go well beyond the base requirement, and those are the ones worth checking before you list.
Getting ready to list?
Talk to Justin, Julie, Amanda or Nicole before your contract goes out. We’ll make sure your warning notices and prescribed documents are attached correctly from the start.