Double glazed windows cost varies because each quotation combines the aluminium frame, insulated glass unit, opening style, hardware, manufacturing and installation requirements. There is no reliable single price that applies to every Melbourne home.
This guide explains the main cost factors so homeowners and builders can compare quotations on the same basis. JL Windows provides project-specific pricing after reviewing dimensions, plans or a window schedule. For product information, visit our double-glazed windows Melbourne page.
What Affects Double Glazing Cost?
The price is determined by the complete window rather than the glass alone. Two windows with the same external dimensions can have different costs because of their opening configuration, frame system, glass specification and installation conditions.
Window Size and Quantity
Larger windows use more aluminium and glass, while very small custom windows still require design, setup, hardware and manufacturing time. A project with repeated window sizes may also be quoted differently from a project containing many one-off shapes and configurations.
Fixed and Opening Panels
A fixed window generally has fewer moving components than an awning, casement, sliding or tilt-and-turn window. Opening panels require compatible sashes, seals, hinges, rollers, locks or operators. The number and type of opening panels therefore affect the final quotation.
Glass Specification
Double glazing is not one universal glass product. Costs can change with glass thickness, cavity width, Low E coatings, argon gas, laminated glass, obscure glass, tinting and safety-glass requirements. The specification must also suit panel size, location and the selected aluminium system.
Standard or Thermally Broken Aluminium
Standard aluminium and thermally broken aluminium frames have different construction and performance. A thermal break includes an insulating section between the internal and external aluminium profiles, reducing direct heat transfer through the frame. It usually represents a different product category rather than a minor glass upgrade.
Learn more about thermally broken windows and doors and how they differ from standard aluminium systems.
Frame Colour, Hardware and Screens
Powder-coated colour, special finishes, lock and handle selections, flyscreens and compatible accessories can affect cost. These items should be listed clearly so customers can compare complete quotations rather than a basic window price with important components excluded.
New-Build and Replacement Window Costs
New-build quotations are usually prepared from architectural drawings and a window schedule. Replacement projects require assessment of the existing openings, wall construction, reveals, access and surrounding finishes. Removal of old windows, protection of the home, disposal and making good may also form part of the installation scope.
For existing homes, see our window replacement Melbourne service and our guide to replacing windows in a house.
How Much More Expensive Is Double Glazing?
Double glazing normally costs more upfront than a comparable basic single-glazed window because it uses a sealed two-pane glass unit and may require different frame and hardware capacities. A percentage comparison without matching the window size, frame, opening style, glass type and installation scope can be misleading.
When comparing options, request separate specifications for the single- and double-glazed alternatives. This shows whether the quotation changes only the glass or also changes the aluminium frame system, Low E coating, hardware or installation requirements.
Comparing Double-Glazed Window Quotes
- Confirm the aluminium system and whether it is standard or thermally broken.
- Check the full glass makeup, including pane thicknesses, cavity and coatings.
- Confirm which panels open and the required hardware.
- Check whether flyscreens, reveals and finishing items are included.
- For replacement work, confirm removal, disposal, access and making-good responsibilities.
- Compare supply-only and supply-and-install pricing on the same scope.
Information Needed for an Accurate Quote
Provide architectural plans or measured opening sizes, window and door configurations, frame colour, preferred glass, project suburb and whether the work is supply-only, new-build installation or removal and replacement. Photos of existing openings are helpful for renovation projects, although final dimensions and site conditions may still require checking.
JL Windows supplies custom aluminium windows and doors for Melbourne homes and builders. To request pricing, call 0481 818 785, email [email protected] or submit your plans through our quotation form.
