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How to install aluminium windows

A person drilling through the side of a window frame fitted into a plaster wall

Overview

Aluminium windows are durable, low maintenance and resistant to Australia's extreme weather. They're also easy to install. We'll tell you how to measure up the window and safely put it into place, as well as give you a handy time-saving tip to make sure your window is level.

Steps

1Check the window measurements

Start by making sure that your aluminium window is going to fit into the hole in the wall. Double check the height and length of your window and the height and length of the opening in the wall to make sure the fit will be right.

2Lift the aluminium window into place

Depending on the size of your aluminium window, you'll need at least two people to help you lift it into place. One to help you lift the window and the other to make sure the window doesn't fall through the other side. As you lift window into place, try to make it as level to the inside wall as possible.

3Check that the window is level

Once your window is in position, make sure you have it level. Place your spirit level on the window ledge to see if it's flat. If it needs to be raised, rather than lift the whole window frame, put a packer under the spirit level until it is flat. Then put the packer under the bottom reveal and snap it off.

4Make sure the window is flush with the wall

Once you've got your window level, you need to make sure it's also flush to the inside wall. To do this, line up your set square against the wall and either push the window out or get a person outside to push it in, until the wall and window are level.

5Attach the window frame to the wall

Pre-drill three holes into each side of the reveal at the top, middle and bottom. Use your set square to make sure the frame stays flush with the wall. Then drill in three screws to attach one side of the reveal to the wall. Now you have one side of the window attached, you won't need help to hold the window in place. 

6Attach the second side of the window frame

Before you attach the second side, check for any gaps between the wall and window frame. If there is a gap, you can put packers into the gap and then drill in the screws. The packers make sure the reveal won't bow. Snap off the packers and tap them into the gap with a hammer.
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.