Double glazing cost calculator
Pick how many windows and roughly how big they are. The estimate uses one Melbourne installer's published prices and updates as you go.
This prices double glazed replacement only. Nobody we can link to publishes an installed price for secondary glazing, so it isn't estimated here. What we do know about secondary glazing.
Estimated installed cost, at Melbourne installer prices
Calculating
- Glazing area
- Headline basis
- Across all sizes and styles
- VEU discount
An estimate from prices one Melbourne window company publishes, not a quote. The sources are listed below.
How the estimate works
For windows of 1.5 m² and up, it multiplies your glazing area by the Melbourne rate of $1,200 to $1,800 per m². Smaller windows aren't priced by area at all: the same company quotes them at $2,300 to $2,500 per window, so the calculator counts windows instead. In Victoria, if the windows are single glazed, it takes off the VEU discount of up to $210 per 10 m², pro rata by area.
Where do the prices come from?
Nobody official publishes window prices, so the rates come from a window company, and we name it in the sources. Across all its sizes and styles it quotes $2,300 to $3,500 per window. It sells windows, so read the figures as a seller's view of the Melbourne market, not a neutral average.
Why does the price per window jump for small windows?
Measuring, making and fitting cost about the same whatever the size, so small windows come out higher per m². That's why the source stops quoting a square metre rate below 1.5 m². A 600 × 900 mm bathroom window and a 1200 × 1200 mm bedroom window land in the same per-window range.
What if I'm not in Victoria?
The estimate still uses Melbourne prices, because those are the only full set we can source. A Perth company, for comparison, quotes $1,200 to $2,100 for a 1200 × 1200 mm uPVC sliding window, which is well under the Melbourne small-window range. Our price guide compares the two cities style by style. Local quotes will always beat either.
How is the Victorian discount applied?
The program states the discount as up to $210 per 10 m² for homes with single-glazed windows. The calculator scales it to your area, which is our assumption: the price you pay after the discount is set by your accredited provider, and it needs approved products only.
What does the estimate leave out?
- Glass upgrades. In Melbourne, acoustic laminated glass adds 15% to 30% according to the same company.
- Bushfire-rated products, and structural repairs found once the old frames come out.
- Anything a very low advertised price hides: such prices are usually supply-only, the company says.
A big job in Victoria can bring in a major domestic building contract (work worth more than $10,000) and Home Warranty (contracts over $20,000). See how to read a window quote for when each applies.