How Much Does Double Glazing Cost in Melbourne?

If you've been thinking about double glazing your home, pricing is probably one of the first questions on your mind. The good news is that retrofit double glazing is significantly more affordable than most Melbourne homeowners expect and considerably cheaper than full window replacement.

This guide breaks down the cost of double glazing in Melbourne by glass type, window type, and door type, so you can get a clear picture of what your project might cost.

What Affects the Cost of Double Glazing in Melbourne?

Before diving into the numbers, it helps to understand what drives the price of a double glazing installation. The main factors are:

Glass type: the performance level of the glass unit you choose has the biggest impact on price per square metre. Entry-level units start from $285/sqm, while next-generation vacuum insulated glass sits at $895/sqm.

Window or door type: different window and door configurations require different levels of time and process. Double-hung and sash windows, for example, involve more work than a simple fixed pane.

Size: all of our double glazed units are custom-fabricated to fit your window dimensions, with larger windows costing more than smaller ones.

Number of windows: projects can be priced per panel or set, with project pricing reflecting the number of windows or doors that will be double glazed.

Double Glazing Glass Prices in Melbourne

RetroFit Double Glaze offers four glass types, each at a different price point and performance level:

ThermoTech™ from $285/sqm Our entry-level unit. Two sheets of 4mm glass with a 12mm argon gap, more than doubling the thermal performance of standard single glazing. A solid, budget-friendly starting point for any retrofit project.

LightBridge/Optitherm™ from $395/sqm Our most popular unit and the one we recommend for most Melbourne homes. Toughened safety glass, an argon gap, and a Low-E coating deliver thermal performance that rivals triple glazing. U-value of 1.4, reducing heat loss by up to 75%.

LightBridge Next/Optitherm Hush™ from $455/sqm Our premium acoustic and thermal unit, ideal for homes near busy roads, trams, or flight paths. A 6.5mm VLam Hush laminated outer pane delivers a Weighted Sound Reduction Index of Rw38, the highest noise reduction available in a standard double glazed unit, with the same strong thermal performance as LightBridge/Optitherm.

VIG (Vacuum Insulated Glass) from $895/sqm Our next-generation unit and the highest-performing glazing product available in Australia. At just 8.3mm thick, VIG is ideal for heritage windows where a slim profile is essential. U-value of 0.4, reducing heat loss by up to 93%. Backed by a 15-year warranty.

Double Glazing Prices by Window Type

All prices below are based on ThermoTech™ glass installation fully installed including labour and materials:

Sliding Windows $650 to $950 per panel

A cost-effective upgrade for one of Melbourne's most common window types. Custom-fabricated to your exact frame dimensions and installed within the existing tracks.

Casement Windows $600 to $900 per panel

Side-hinged casement windows are among the more straightforward retrofit installations, making them one of the more affordable options per panel.

Double Hung Windows $1,500 to $1,900 per set

Double-hung windows involve two independently moving sashes, which requires more labour and skill. The price reflects the complexity of the installation, which includes re-hanging and re-balancing each sash.

Sash Windows $1,500 to $1,900

Traditional timber sash windows are a defining feature of Melbourne's period homes. RetroFit Double Glaze specialises in retrofitting sash windows with double glazing while retaining every original frame and counterweight mechanism.

Awning Windows $600 to $900

Top-hinged awning windows are a popular choice in Melbourne homes. Pricing starts from $600 per pane, fully installed.

Custom Windows Quote Only

Quote on application. Every custom unit is precision-fabricated to your exact dimensions, with pricing determined by the specific requirements of your project.

Double Glazing Prices by Door Type

Sliding Doors $1,800 to $1,300 per set

Large sliding doors are one of the most impactful double glazing upgrades available, given their size and the significant heat transfer they allow in single-glazed form. Pricing starts from $1,800 per set, fully installed.

French Doors $1,700 to $2,500 per set

Retrofit double glazing for French doors replaces only the glass panels within the existing door frames, preserving their look and aesthetic.. From $1,700 per set, fully installed.

Folding Doors $1,800 to $2,800 per set

Each panel of a folding door system is reglazed individually, with all track and hinge hardware retained. Pricing from $1,800 per set, fully installed.

Front Doors from $700 to $1,100 per door

Upgrading the glazed panel in your front door to double glazing improves thermal performance and security without replacing the door itself. From $700 per door, fully installed.

Why Retrofit Double Glazing Costs Less Than Full Window Replacement

One of the most important things to understand about double glazing pricing in Melbourne is the difference between retrofit double glazing and full replacement.

Full window replacement involves removing glass, frames, sills, and installing brand new window units from scratch. For a typical Melbourne home with 10 to 15 windows, this process can cost between $30,000 and $60,000, once demolition, plastering, and multiple trades are factored in.

Retrofit double glazing works differently. We replace only the glass within your existing timber frames, with no demolition and no plastering required. The result is the same double glazing performance, at up to 66% less cost.

For Melbourne homeowners with original timber frames, particularly those in heritage or period homes, retrofitting is often the preferred choice as it enables homeowners to preserve the original frames that give their home its character and value.

What Does a Typical Melbourne Double Glazing Project Cost?

To give you a sense of what a whole-home double glazing project might cost, here are some rough indicative figures for a typical Melbourne home:

Small home or apartment (6 to 8 windows): From approximately $4,000 to $8,000 depending on window type and glass selected.

Mid-size home (10 to 14 windows): From approximately $7,000 to $15,000 depending on window type and glass selected.

Larger period home (15 or more windows, sash or double-hung): From approximately $15,000 to $25,000 depending on window configuration and glass type.

These are indicative ranges only. The most accurate way to understand the cost for your specific home is to book a free measure and quote, where our team will assess your windows, recommend the right glass, and provide a fixed price with no surprises and full transparency.

Is Double Glazing Worth the Cost in Melbourne?

For most Melbourne homeowners, the answer is yes and the numbers back it up.

Retrofit double glazing consistently returns more than its cost in added property value, with many clients reporting valuations above what the installation cost. On top of that, energy bill savings of up to 60% mean the installation pays for itself over time. And the improvements to comfort, noise, and condensation are felt immediately.

When you factor in that retrofitting costs up to 66% less than full replacement, and that your original timber frames are preserved rather than sent to landfill, the case for retrofit double glazing is compelling.

Get a Fixed Price to Double Glaze Your Home

RetroFit Double Glaze offers a price beat guarantee, if you find a better price on the same service, we'll match it. All installations are backed by a lifetime workmanship warranty and a 10-year IGU warranty (15 years for VIG).

Book a free, no-obligation measure and quote, or use our online double glazing cost calculator to get an indicative price for your project.