How much does double glazing cost in Melbourne?

Double glazing is one of the most requested upgrades in Melbourne homes, and one of the hardest to price from the outside. Every window is a different size, every frame is in a different condition, and quotes can look very different on paper. This guide sets out the typical ranges we see quoted around Melbourne, what moves the price up or down, and how to compare quotes fairly.

Typical double glazing prices in Melbourne

The ranges below come from published Melbourne price guides in 2026. They are a starting point, not a quote: the only way to get a real figure for your home is a measure on site.

A whole-home job covering 15 to 20 windows is commonly quoted between about $12,000 and $35,000, again depending heavily on the mix of windows and doors.

What changes the price

• Size and number of windows. Glass is priced by area, and large sliding doors cost far more than a small bathroom window.
• Retrofit or new frames. Retrofitting keeps your existing frames and swaps the glass; new windows replace the frame too. Retrofit is cheaper, but only when the frame can take the extra weight and depth.
• Frame material. Aluminium, thermally broken aluminium, uPVC and timber all sit at different price points and perform differently.
• Glass type. Low-E coatings, laminated safety glass, acoustic glass and toned glass each add cost and benefit.
• Access. Upper-storey windows, tight side paths and heritage details take more time.
• Window style. Sliding, awning, sash and double-hung windows each have different hardware and labour.

Retrofit or replace?

Retrofit makes sense when your frames are sound, square and deep enough for a sealed double-glazed unit. It keeps the look of the house and costs less. Full replacement is the better choice when frames are corroded, warped or drafty, or when you want a different window style or a thermally broken frame.

One honest note on aluminium: glass does most of the work, but a standard aluminium frame still conducts heat. If comfort and energy bills are the main goal, ask whether a thermally broken frame is worth it for the rooms you use most.

How to compare quotes fairly

Two quotes for "double glazing" can describe very different jobs. Before you compare prices, check that each quote lists:

1. The glass make-up for every window (for example 4 mm / 12 mm gap / 4 mm, Low-E or clear).
2. Whether frames are retrofitted or replaced.
3. Removal and disposal of the old glass or frames.
4. Making good: flashing, sealing, architraves and any painting.
5. What the warranty covers and for how long.

At Glassy Slide we measure on site and give you a clear, itemised quote before any work starts, so you know exactly what you are paying for.

Rebates in Victoria

The Victorian Energy Upgrades program offers discounts on approved window upgrades through accredited providers. Eligibility and amounts change, so check the current rules on the Victorian Government's energy website before you rely on it in your budget.

The short version

Expect roughly $550 to $1,100 per window for a retrofit and $800 to $2,500 for a new double-glazed unit, with the real figure set by size, glass, frames and access. Get at least two itemised quotes and compare them line by line, not just on the total.