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October 14, 2026

Most of us install a smoke alarm, hear it beep when we burn the toast, and then forget about it. But here’s something a lot of Melbourne homeowners don’t realise: smoke alarms don’t last forever.

Every smoke alarm needs replacing every 10 years, whether it runs on a battery or is hardwired into your home. If yours has been on the ceiling since you moved in, it might be time to take a closer look.

Here’s what the 10-year rule means, how to check the age of your alarms, and what’s involved in a smoke alarm replacement.

Quick Answer:

  • All smoke alarms need replacing every 10 years, regardless of type or how well they seem to work.
  • You’ll find the manufacture or expiry date printed on the back or side of the alarm.
  • If your home was built after August 1997, replacements must be hardwired, which means a licensed electrician needs to do the job.
  • Pressing the test button checks the battery and siren, not whether the sensor can still detect smoke reliably.

What Is the 10-Year Rule?

Victoria’s fire services advise that all smoke alarms be replaced every 10 years, no matter what type you have. It’s also what Australian manufacturers design them for, which is why so many alarms now come with a sealed 10-year lithium battery.

The rule applies to every home in Victoria, from a 1950s weatherboard in Reservoir to a newer townhouse in Point Cook. It’s about making sure the device you’re relying on still does its job when it counts.

Why Do Smoke Alarms Expire?

It’s a fair question. If the alarm still beeps when you press the button, why replace it?

The answer comes down to smoke alarm lifespan and what happens inside the unit over time. The sensor that detects smoke slowly loses sensitivity. Dust, cobwebs, cooking residue and even tiny insects build up inside the chamber, and the electronics age just like any other appliance.

The tricky part is that you can’t see any of this happening. An old alarm might look perfectly fine and still chirp on test, but take longer to react to real smoke. In a house fire, those extra seconds matter.

How to Check the Date on Your Smoke Alarm

Checking takes about two minutes. Here’s how to do it:

  1. Find the label: Twist the alarm off its base (most come away with an anticlockwise turn) or check the side of the unit.
  2. Look for a date: You’re after a manufacture date or a “replace by” date. Some brands print it as a month and year, others as a full date.
  3. Do the maths: If the manufacture date is 10 years ago or more, it’s due for replacement.

If you have hardwired smoke alarms, be careful. They’re connected to 240V mains power, so if you’re not sure how to remove one safely, leave it to an electrician. And if there’s no date at all, that’s usually a sign the alarm is old enough to replace.

When to Replace Smoke Alarms (Besides the 10-Year Mark)

The 10-year rule is the outer limit, not the only reason to swap them out. Knowing when to replace smoke alarms early can save you a lot of hassle.

It’s time for a smoke alarm replacement if:

  • It keeps chirping, even after you’ve changed the battery
  • It doesn’t sound when you hold the test button
  • It goes off for no reason, especially at night
  • The casing has yellowed, cracked or been painted over
  • You’ve moved into a home and have no idea how old the alarms are

That last one catches a lot of new homeowners out. Previous owners rarely leave a note about when the alarms went in, so checking the dates should be part of your move-in to-do list.

Can You Replace a Smoke Alarm Yourself?

It depends on what type you have and when your home was built.

If you’re in an older home with battery-powered alarms, you can swap them yourself. Fire services recommend upgrading to a model with a 10-year lithium battery in a tamper-proof chamber.

But if your home was built from 1 August 1997, Victorian rules say your alarms must be hardwired to mains power with a backup battery. Homes built from 1 May 2014 also need them to be interconnected. When you replace an expired alarm in these homes, the new one has to meet the same standard. Only a licensed electrician can legally do that work.

What Happens During a Professional Smoke Alarm Replacement?

Having an electrician handle your smoke alarm replacement is usually quicker and simpler than people expect. Here’s what’s typically involved:

  • A quick check: We look at your existing alarms, their age and where they’re positioned.
  • Compliance advice: We let you know what your home legally needs based on its build date.
  • Safe removal: The old alarms are disconnected and taken down.
  • New installation: New alarms go in to Australian Standard AS 3786, interconnected where required.
  • Testing: Every alarm is tested so you know they’re all working together.

It’s also a good chance to fill any gaps. Fire services recommend having alarms in bedrooms and living areas, not just the hallway, so it’s worth adding coverage while the electrician is there.

Getting the Most From Your Smoke Alarm Lifespan

To make sure your alarms last the full decade and work properly the whole time, a little care goes a long way:

  • Press and hold the test button once a month
  • Gently vacuum or dust around the cover once a year
  • Replace 9V batteries every year, if your alarms use them
  • Keep the alarms clear of paint, stickers and decorations

A handy tip: write the install date on the base of each new alarm in permanent marker. Future you will be grateful.

Book Your Smoke Alarm Replacement in Melbourne

If your alarms are nearing the 10-year mark, or you’re not sure how old they are, our licensed electricians can help. We’ll check what your home needs, replace any expired alarms and make sure everything’s compliant and working properly.

Find out more about our smoke alarm installation service, or get in touch to book a time that suits you. It’s one of the easiest ways to keep your family safe at home.

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