Double glazing: costs and options
Before replacing windows, identify whether the problem is winter heat loss, summer sun, street noise or a draught around the sash. The best glass and frame specification depends on the problem and the orientation of each opening.
What to include in the scope
Get separate quotes for retaining sound frames, fitting secondary glazing and replacing the complete window. Compare whole-window U-values and solar heat gain coefficients for the actual frame and glass. Larger openings, upstairs access, reveals and damaged timber can change the price independently of the glass area.
Australian Government YourHome — Glazing. Reviewed 12 November 2026. This reference provides planning context.
Build your budget
Adjust the quantities and unit rates. This is a planning tool, not an installer quote.
Use local itemised quotes as the starting rates. Freight, labour availability and minimum call-out charges can change the total by location. Enter GST-inclusive rates where available and list removal, disposal and access separately when excluded.
Ask before you accept a quote.
- Will you remove old frames and make good plaster, paint and external cladding? Who checks opening sizes, egress and any strata or heritage conditions?
- Is GST included, and is the price fixed or estimated?
- Are removal, disposal, access and making-good included?
- What changes would trigger extra costs, and who approves them?
- What is the warranty on products and workmanship?
Compare quotes against the same scope
Record itemised inclusions from at least two quotes, then evaluate differences in quality, warranty, timing and exclusions.
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