Published 18 September 2026.
Homeowners considering double glazed window replacement in Melbourne are often deciding whether to upgrade ageing single-glazed timber or aluminium windows as part of a renovation. The right approach depends on more than the glass alone: the frame system, seals, installation, existing opening and surrounding building fabric all contribute to the finished result.
JL Windows supplies custom aluminium replacement windows for Melbourne homes, with double glazing and Low E options available where suitable for the project.
Can I Replace Single-Glazed Windows with Double Glazing?
Often, yes. For a full window replacement, the existing window is assessed and a new aluminium frame and compatible insulated glass unit can be manufactured to suit the measured opening. The appropriate specification depends on window size, configuration, energy requirements, orientation and site conditions.
If you are replacing ageing timber frames, see our timber-to-aluminium replacement guide.
Do I Need to Replace the Frame as Well as the Glass?
That depends on the existing window and the proposed system. Installing double glazing into an existing frame is not the same as replacing the complete window. Where frames are deteriorated, poorly sealed, unsuitable for the intended glass or part of a larger renovation, complete frame-and-glass replacement may be the more appropriate project scope.
Double Glazing vs Low E Glass
Double glazing describes an insulated glass unit with two panes separated by a sealed cavity. Low E refers to a low-emissivity coating used to reduce radiant heat transfer. Depending on the project, Low E glass can form part of a double-glazed unit. See JL’s double glazing options for more information.
Is Double Glazing Worth Considering for a Melbourne Home?
It may be relevant where homeowners are replacing older single glazing, renovating a substantial part of the house, addressing indoor comfort or considering external noise. The benefit and appropriate specification vary by property, orientation, window area, building fabric and budget, so the decision should be made project by project.
How Much Does Double-Glazed Window Replacement Cost?
Cost varies with window quantity and dimensions, opening type, glass make-up, frame system, colour, hardware, access, removal of existing windows and installation complexity. A whole-house project therefore cannot be priced accurately from a generic per-window figure.
Review the Melbourne window replacement cost guide, then send photos and approximate dimensions for a project-specific review.
Can I Upgrade Only Some Rooms?
Yes. Replacement can often be staged. Bedrooms, living areas or windows affected by comfort, noise or deterioration may be prioritised first. Where future stages need to match, select the frame system, powder-coat colour and glazing strategy with the whole property in mind.
What Should Homeowners Send for a Quote?
You do not need architectural plans to start. Send clear photos of the existing windows, your suburb, approximate width and height, and the approximate number of windows. If you already know the preferred frame colour or opening style, include those details.
