The short answer
A Melbourne window company prices fully installed double glazing at $2,300 to $3,500 per window. Windows of 1.5 m² and up are quoted at $1,200 to $1,800 per m², and anything smaller at $2,300 to $2,500 per window. A whole 3 bedroom home runs $15,000 to $40,000 or more. Victorian homes with single-glazed windows can claim up to $210 per 10 m².
What does each size and style cost?
The same company breaks its prices down two ways. By size, a standard 1800 × 1500 mm window is $2,800 to $3,200 and a large 1800 × 2100 mm one $3,000 to $3,500. By opening style:
Acoustic laminated glass adds 15% to 30% on top, which matters if you're near a tram line or a main road.
What would eight windows cost?
Take a house with 6 bedroom and living windows at 1200 × 1200 mm and 2 sliders at 2400 × 1200 mm. That's 14.4 m² of glass across 8 openings. The catch is that the smaller windows are 1.44 m² each, just under the 1.5 m² line the square metre rate is quoted for, so they have to be priced per window. Only the two sliders can be priced by area.
8 windows, 14.4 m² of glazing
Show the numbers
| Item | Range |
|---|---|
| 6 windows under 1.5 m², per window | $13,800 to $15,000 |
| 2 sliders, 5.76 m² by area | $6,900 to $10,400 |
| All 8 windows | $20,700 to $25,400 |
| 8 windows at the headline range | $18,400 to $28,000 |
| Marker: Major contract over $10,000 | $10,000 |
| Marker: Home Warranty over $20,000 | $20,000 |
Priced the way the source prices each size, the house comes to about $20,700 to $25,400. Simply multiplying the headline per-window range by 8 gives $18,400 to $28,000, which is wider at both ends but in the same place. Either way this is a job past both Victorian thresholds on the chart. The VEU discount on 14.4 m² is about $302 at the full rate: worth having on the quote, and not something that changes the decision.
Why does climate zone 6 matter here?
Melbourne is in climate zone 6, described as mild temperate, where the job is to cut cooling in summer without giving up winter warmth. A single headline number is a poor way to choose glass here. Ask for the WERS heating stars and cooling stars, which run 0 to 10 stars, rather than one figure. The code looks at both sides too: a conductance check across climate zones 2 to 8 and a solar heat gain check across climate zones 1 to 7.
What paperwork does a big window job need in Victoria?
Two thresholds are marked on the chart. Consumer Affairs Victoria says domestic building work worth more than $10,000 needs a major domestic building contract in writing. It also lists single-trade jobs, including glazing-only jobs, among those that don't. A replacement that also brings new reveals and making good may not be glazing alone, so ask the installer in writing which applies to your job.
Separately, since 1 July 2026, building contracts over $20,000 for homes of three storeys or less come under the state's Home Warranty scheme, run by the Building and Plumbing Commission. It covers lost deposits, incomplete work, and defective or non-compliant work. Some pages still show the older domestic building insurance threshold, including Consumer Affairs Victoria's contract page when we checked, so go by the date on whatever you read.
The contract rules themselves are changing too: Victoria's new domestic building contract laws take effect by 1 December 2026. And the building regulator says full replacement of building elements is treated as an alteration, so ask a registered building surveyor where your job sits before the first window comes out.
What is changing, and when?
Victorian dates worth knowing
Show the dates
| Date | What happens |
|---|---|
| 1 May 2026 | Victoria adopts NCC 2025, with the same 7-star minimum |
| 1 July 2026 | Home Warranty for contracts over $20,000 |
| 16 September 2026 | When these dates were last checked |
| 1 October 2026 | VEU insulation discount, up to $1,482 |
| 1 December 2026 | New domestic building contract laws in effect by this date |
| 1 July 2027 | Rentals need draughtproofing on external doors and windows |
The 7-star rule applies to new homes rather than to replacing windows in an existing one. If you own a rental in Melbourne, the 2027 date is the one to diarise, and our renters and landlords guide covers what it asks for.
How do you get Melbourne quotes you can compare?
- Give every company the same window schedule, with sizes and opening styles.
- Ask for fully installed prices, including reveals, sealing and taking the old windows away.
- Ask for the VEU discount on its own line, with the glazing area it was calculated from.
- Ask for WERS heating and cooling stars for the product being quoted.
- If the total is over the thresholds above, ask what contract and Home Warranty cover the job comes with.