How Much Does Double Glazing Cost in Adelaide?
Double glazing in Adelaide costs $400 to $900 per window for a retrofit insulated glass unit into your existing frames, and $900 to $1,800 or more per window for a full replacement including new double-glazed frames. A modest home doing 8 to 12 windows typically lands between $6,000 and $20,000 depending on the route. The gap between those numbers comes down to whether the frames are reused or replaced, the glass spec (standard, Low-E or acoustic laminate), the frame material (aluminium, timber or uPVC), and access. Get itemised quotes so you can see exactly what drives the price on your home.
Key takeaways
- Retrofit insulated glass unit: roughly $400 to $900 per window.
- Full window replacement with new frames: roughly $900 to $1,800-plus per window.
- Glass spec matters: Low-E and acoustic laminate add cost but often earn their keep on the right window.
- Frame material drives price: aluminium is cheapest, uPVC and timber cost more.
- Whole-home projects commonly run $6,000 to $20,000, so staging the worst rooms first is a valid strategy.
Retrofit versus full replacement: where the money goes
The single biggest cost fork is whether you keep your existing window frames or replace them. Retrofit double glazing swaps the single pane for a sealed double-glazed unit in the frame you already have, so you pay for the glass unit and the labour to fit it, not for new frames. That is why retrofit sits at $400 to $900 per window. It only works where the existing frame is sound and deep enough to take the thicker unit, which suits many Adelaide homes with aluminium or solid timber frames.
Full replacement means new frames and new double-glazed sashes, so you are buying the whole window. That pushes the price to $900 to $1,800 per window and beyond for large or custom sizes. You choose this route when the frames are rotten, warped or too shallow, when you want to change the window style, or when you want the airtightness that only a purpose-built double-glazed frame delivers.
For a typical Adelaide home, mixing the 2 is common: retrofit where the frames are good, full replacement where they are failing. A vetted installer will walk the house and tell you honestly which windows suit which approach, and the quote should itemise it.
What pushes your quote up or down
Glass specification is the first lever. A standard clear double-glazed unit is the baseline. Add a Low-E coating to cut heat and the unit costs more but performs far better on west and north windows. Choose acoustic laminate for a window facing Anzac Highway or the airport flight path and the price rises again, but so does the noise reduction. Argon gas fill is a small add for a measurable insulation gain.
Frame material is the second lever. Aluminium is the most affordable and the default across Adelaide. uPVC frames insulate better and suit cold rooms but cost more and have a heavier look some character homes cannot carry. Timber frames match heritage homes but sit at the top of the price range and need maintenance. Thermally broken aluminium splits the difference on performance and price.
Then come the practical factors: window size and quantity, ground versus upper floor access, whether scaffolding is needed, and how much making-good the plaster and paint will need afterward. Heritage or character homes in Unley, Norwood or Prospect can carry extra cost if the look has to be preserved exactly.
Getting a quote you can trust
Beware headline per-window prices in ads. A $399 window is almost always a small standard-glass retrofit with nothing added, and your actual mix of sizes and specs will land higher. The only reliable figure is an itemised written quote for your specific windows, listing glass type, frame material, gas fill, and what making-good is included.
Ask each installer to price the same scope so you are comparing like with like. If one quote is dramatically cheaper, check whether it has dropped the Low-E coating, switched to a thinner unit, or excluded the plaster and paint repair that the others included. The cheapest number on the page is rarely the cheapest job once those omissions surface.
We connect you with vetted local specialists who quote in writing and itemise the spec, so you can compare quotes on equal terms and decide the scope with a clear view of what each dollar buys.
Ready to get real numbers? Compare 3 free quotes from vetted Adelaide specialists for double glazing.
Frequently asked questions
A retrofit insulated glass unit runs about $400 to $900 per window, while a full replacement with new frames runs about $900 to $1,800 or more. The exact figure depends on glass spec, frame material and window size.
A typical Adelaide home with 8 to 12 windows commonly lands between $6,000 and $20,000, depending on whether you retrofit or fully replace and what glass you choose. Staging the worst rooms first is a common way to spread the cost.
Usually because the cheap quote uses standard clear glass instead of Low-E, a thinner unit, or excludes plaster and paint making-good. Always compare itemised quotes for the same spec so a low headline number is not hiding cut corners.