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Person removing smoke alarm from roof.


Learn how simple it can be to install a smoke alarm by yourself. We show you where to install your alarm and how to attach it to the ceiling. We also explain what to do when you're screwing directly into plaster. Plus you will see how to make sure the alarm is working properly once it's installed.


1Mark up your drill points on the ceiling

To work properly, smoke alarms should be installed on the ceiling at least 300mm from the nearest wall. Measure and mark that distance on your ceiling and then lay the base of the smoke alarm up against the mark. Use the baseplate bracket as a template to mark up your drill points on the ceiling.
Person using measuring tape and pencil to make a mark on the roof.

2Drill screw holes into the ceiling

Next, drill your holes into the ceiling. Most ceilings are made of plaster covering a timber frame. If you have to drill straight into the plaster, you need to reinforce the drill holes with some plasterboard anchors before you drive in your screws.

Person drilling a hole into the roof.

3Mount the alarm on the ceiling

Now, screw the baseplate onto the ceiling. Make sure you are standing safely on the floor before putting the battery into your smoke alarm. Then fix the alarm back into the bracket on the ceiling. While you are up there, press the test button on the alarm to make sure it's working.
Person removing smoke alarm from roof.

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More D.I.Y. Advice

Health & Safety

Asbestos, lead-based paints and copper chromium arsenic (CCA) treated timber are health hazards you need to look out for when renovating older homes. These substances can easily be disturbed when renovating and exposure to them can cause a range of life-threatening diseases and conditions including cancer. For information on the dangers of asbestos, lead-based paint and CCA treated timber and tips for dealing with these materials contact your local council's Environmental Health Officer or visit our Health & Safety page.

When following our advice in our D.I.Y. videos, make sure you use all equipment, including PPE, safely by following the manufacturer’s instructions. Check that the equipment is suitable for the task and that PPE fits properly. If you are unsure, hire an expert to do the job or talk to a Bunnings Team Member.