What replacing your windows costs
Installed prices that Melbourne and Perth window companies publish, the Victorian discount, and the rules that come with a big job. Every figure is sourced and dated.
Installer-reported prices
Prices by glazing type
No government body publishes window prices, so these are ranges that window companies publish. So far we have usable price lists from one Melbourne and one Perth company. Each is named in the sources, and each makes or sells windows, so read them as a seller's view.
Double glazed replacement, Melbourne
Fully installed, or $1,200 to $1,800 per m² for windows of 1.5 m² and up. Smaller windows come out higher per m², so they're priced at $2,300 to $2,500 per window.
Double glazing cost guideWhole 3 bedroom home, Melbourne
For 10 to 15 windows. Secondary glazing is cheaper upfront, but nobody we can link to publishes an installed price. What we know about it.
Timber double glazed sash
The top of the market, reported by a Melbourne window company.
Victoria discounts double glazing by the square metre
The Victorian Energy Upgrades program sets its window glazing discount by the area of glass you replace, and the accredited provider works it into the price it quotes you.
-
Who can get it
Victorian households and most businesses with single-glazed windows.
-
Renting
In a private rental, renters are eligible, although landlord permission may be needed.
-
Products
-
Final price
The price after the discount is set by your accredited provider.
The NCC 7-star rule, and where windows fit
The National Construction Code sets a minimum thermal rating for new homes, and glazing is one of the biggest levers in it. The Australian Government's YourHome guide says up to 40% of a home's heating energy can be lost through windows.
- Warm north
- In climate zones 1 and 2 the minimum can be 6.5 or 6 stars for a house with a qualifying roofed outdoor living area.
- Victoria
- NCC 2025 adopted on 1 May 2026. Alongside the stars, the Whole-of-Home rating must be not less than 60.
From the blog
Prices, discounts and rules, each with its sources at the end.
- Double glazing cost Prices by window style and size, what glass upgrades add, and what a whole house runs to.
- The Victorian glazing discount How the VEU discount is worked out, who qualifies, and which products count.
- NCC 7-star rules and glazing What the code asks of new homes, the glazing limits by climate zone, and what it means for renovations.
- uPVC vs aluminium vs timber Frame materials compared on heat loss and price, with the source of each figure named.
- WERS ratings explained How to read a window energy rating, and the two numbers worth asking every supplier for.
- Secondary glazing vs replacement Adding a second pane against replacing the window: what installers say about price, and what each cannot fix.
- Double glazing cost in Melbourne Local prices by size and style, one eight-window home worked through, and the Victorian rules for a big job.
- Renters and landlords Who can claim the Victorian discount in a rental, the draughtproofing standard, and the gas check that comes first.
- How to read a window quote The lines that decide whether two quotes are comparable, and the paperwork a large job needs.
Ready to price your own windows?
Start with the calculator, then check any quote you get against our line-by-line guide.
Estimate my windowsRun a glazing business?
A managed website plan for glaziers and window companies, with the price, setup fee and term on one page.
Websites for glaziers