Double Glazing Retrofit Cost in Perth (2026)
In Perth retrofitting double glazing is priced by the number and size of windows and the method, with summer heat and double-brick walls the context.
Your double glazing retrofit details
Your estimate sits within the typical range.
Your estimate sits within the typical range.
Double glazing cuts heat loss, heat gain and noise. Retrofitting a pane to existing frames is far cheaper than full window replacement, though replacement with uPVC frames performs best. Prioritise the rooms you use most.
Ways to save
- Retrofit a second pane to existing frames to get most of the benefit for far less than full replacement.
- Do the rooms you use most, or the noisiest/sunniest windows, first if budget is tight.
- Compare aluminium versus uPVC frames, uPVC insulates better but costs more.
How we estimate this
Retrofitting double glazing in Australia typically costs around $800 to $1,200 per window for new double-glazed units in 2026, less for retrofitting a pane to existing frames, and more for uPVC frames. A whole house of 10 to 15 windows often runs $8,000 to $25,000.
Pricing reviewed: October 2026.
What a double glazing retrofit costs in Perth
A double-glazing retrofit in Perth is priced on the number and size of the windows and the method, since the options span a secondary pane fitted inside the existing window up to a double-glazed unit or a full window replacement, so the window count and the method lead the figure. A few secondary panes are cheaper, while replacing many large windows with new units costs much more, so the number, the size and the method drive the price.
Perth's hot, dry Mediterranean summers make heat control the main reason to retrofit double glazing, because a double-glazed window keeps the fierce summer heat out of a home, and a double-brick home's thermal mass pairs well with better glazing. The cooler winters also benefit from the reduced heat loss. A window on the hot western side gains most from the upgrade. The isolation of the WA market can add lead time for a specialty unit. Retrofitting double glazing is glazing work by a glazier, with a licensed builder where the opening is structurally altered, in Western Australia under WA Building Services.
Retrofitting double glazing is glazing work by a glazier, with a licensed builder where the window opening or lintel is structurally altered, so no building licence applies to a straight glass swap, in Western Australia under WA Building Services. For a Perth home, the clearest way to price a double-glazing retrofit is by the number and size of windows and the method, with summer heat and double-brick walls the context.
Compare against the national picture: Double Glazing Retrofit Cost in Australia →
Double Glazing Retrofit Cost in other cities
Frequently asked questions
How is a double-glazing retrofit priced in Perth?
By the number and size of the windows and the method, so a few secondary panes are cheaper while replacing many large windows with new units costs much more in Perth.
Why retrofit double glazing in Perth?
The hot, dry Mediterranean summers make heat control the main reason, as a double-glazed window keeps the fierce heat out and a double-brick home's thermal mass pairs well with better glazing in Perth.
Which windows gain most in Perth?
A window on the hot western side gains most from the upgrade, keeping the afternoon summer heat out of a Perth home.
Do I need a licence for a double-glazing retrofit in Perth?
A straight glass swap is a glazier's work, not a licensed building trade, though a licensed builder is needed where the opening is structurally altered, in Western Australia under WA Building Services.