Published 18 September 2026.
Replacing ageing timber windows with aluminium is a common consideration for Melbourne homeowners renovating established houses. Custom aluminium windows can often be manufactured to suit existing openings, while providing low-maintenance frames and the opportunity to update glazing, opening styles and colours.
The correct replacement method depends on the existing timber frame, sill, wall construction, flashings, drainage, internal finishes and access. JL Windows reviews these conditions before the final window sizes and installation scope are confirmed.
Can Timber Windows Be Replaced with Aluminium?
Often, yes. The existing opening is measured and the new aluminium window is manufactured to suit the project. Some properties may require additional preparation or finishing where the old frame interfaces with brickwork, weatherboard, render, plaster or other surrounding materials.
Because existing homes vary, a site assessment is more reliable than assuming every timber window can be removed and replaced using the same detail.
Why Do Homeowners Change from Timber to Aluminium?
- Ageing, deteriorated or difficult-to-operate timber frames
- Lower ongoing frame maintenance
- A renovation or exterior design update
- A change to awning, sliding, fixed or combination windows
- An opportunity to consider double glazing or Low E glass
- Consistent powder-coated colours across a larger renovation
Can You Upgrade to Double Glazing at the Same Time?
In many projects, replacement is an opportunity to consider double-glazed aluminium windows. The appropriate glass and frame system depends on window dimensions, orientation, room use, energy requirements, external noise and budget.
Double glazing should be considered as part of the complete window system rather than as glass alone. Frame seals, installation and the surrounding building fabric also influence overall performance.
Will Replacing Timber Windows Damage the House?
Removal needs to be planned around the existing construction. Brickwork, cladding, internal plaster, reveals, sills, flashings and sealants may all interface with the old frame. The required finishing work varies from property to property and should be identified as part of the agreed scope.
Can I Replace Only Some Windows?
Yes. Many homeowners stage a replacement project. If later stages need to match, it is useful to establish the frame system, powder-coat colour, glazing and general window style from the beginning.
How Much Does Timber-to-Aluminium Window Replacement Cost?
There is no meaningful fixed price for every opening. Cost depends on window size and quantity, opening configuration, glass, frame system, colour, access, removal conditions and installation complexity. See our window replacement cost guide for the main pricing factors.
What Should I Send for a Quote?
You do not need architectural plans to start. For an initial review, send clear photos of the existing windows, your suburb and approximate width and height. If you know your preferred colour, glazing or opening style, include those details as well.
