Standard Window Sizes in Australia

There is no one standard window size in Australia. Each window maker publishes its own chart of stock sizes. In Queensland, the awning window charts from Suncoast Windows and Bradnam's list the same sizes: 600 mm to 2100 mm high and 610 mm to 3010 mm wide, with the widths going up in 300 mm steps.

Below are those Queensland sizes, how the size codes work, why a chart from another maker or state will not match, how big a window has to be under the building code, and how to measure. Every size was checked on the makers' own size charts and on official pages on 18 October 2026. There are no prices here. For those, see our guide to window replacement cost.

Is there a standard window size in Australia?

Not one size. Makers each set their own stock sizes, and they publish them as size charts. For anything else, makers such as Suncoast say other sizes are available on request.

The Australian Standard for windows, AS 2047, is not a size list. The QBCC's fact sheet on windows and glazed external doors describes it in terms of performance, such as wind ratings and water penetration. Every window sold or installed in Queensland has to comply with it.

So "standard size" means a maker's stock size. Two makers can both call a window "standard" and still be 50 mm or more apart.

What are the standard window sizes in Queensland?

For sliding and awning windows, Suncoast Windows' Queensland chart uses this grid. Bradnam's Queensland awning chart lists the same sizes.

Source: Suncoast Windows, Queensland size range catalogue (sliding windows) and Queensland awning window chart; Bradnam's, Queensland awning window standard sizes. Checked 18 October 2026.

Not every height comes in every width. On Suncoast's sliding chart, a 1200 mm high window starts at 910 mm wide, and a 1500 mm high window starts at 1210 mm wide. From 2410 mm wide, sliding windows have three panels. The 1800 mm and 2100 mm high windows have a fixed panel at the bottom, 600 mm high, under the part that opens.

Louvre windows work differently. The height is set by the number of blades. Suncoast's Queensland louvre chart runs from 362 mm high with two 152 mm blades to 2876 mm high with 20 blades, in frame widths from 610 mm to 2710 mm.

How do window size codes work?

The code gives the height first, then the width, each in hundreds of millimetres. Suncoast's catalogue says height is always shown first. So a 1218 window is 1200 mm high and 1810 mm wide.

The letters in front describe the panels, seen from outside. On Suncoast's chart:

• SF1218 is a sliding window, one sliding (S) and one fixed (F) panel, 1200 mm high by 1810 mm wide
• A0906 is a single awning window, 900 mm high by 610 mm wide
• AA1212 is two awning sashes side by side, 1200 mm high by 1210 mm wide

Suncoast also says its sizes are finished frame sizes and do not include the building-in fin around the frame. A&L Windows uses two-digit size codes on its chart too, but its sizes are a different measurement (more on that below).

Why are window sizes different between makers and states?

Because each maker sets its own range, and some ranges change by state. The charts do not say why. They just show it. Here is the same type of window from two charts, and a third maker's national chart:

Sources: Bradnam's awning window standard sizes for Queensland and NSW; A&L Windows, standard sliding windows (February 2023). Checked 18 October 2026. A&L marks its 2110 mm and 2368 mm heights and its 3010 mm width as available in Queensland and northern NSW only.

The measurements are not the same kind either. Suncoast and Bradnam's give the frame size and the stud opening. A&L gives the overall reveal size. So a "1200" on one chart is not always a "1200" on another.

Wind matters too. Suncoast and Bradnam's both say some sizes depend on the design wind load under AS 2047. A&L says its chart is for its standard range in N2 wind areas, with other limits in other wind categories. On an exposed Gold Coast block, a size on the chart may not be on offer.

How big does a window need to be?

Big enough for light and fresh air, under the National Construction Code 2022. For a habitable room, such as a bedroom or living room:

• Light: the windows need a glass area of at least 10% of the room's floor area, not counting the frame (NCC Part 10.5)
• Air: windows, doors or other openings that open need at least 5% of the floor area (NCC Part 10.6)

So a 3 m by 4 m bedroom (12 m2) needs at least 1.2 m2 of glass and at least 0.6 m2 that opens. The NCC measures the opening area as the size of the sash that opens. In a two-panel sliding window, only the sliding panel counts.

The code allows other ways to meet these, such as a roof light or light borrowed from the next room. A window needed for light that faces the boundary of a neighbouring block must be at least 900 mm from that boundary. These rules apply to new building work. If your job needs approval, your certifier checks them.

How high should a bedroom window sill be upstairs?

If the opening part of the window is less than 1.7 m above the floor, and the floor is 2 m or more above the ground below, the window needs protection. That is NCC 2022 Housing Provisions 11.3.7, for bedrooms.

The protection is a restrictor or a securely fixed screen that will not let a 125 mm sphere through. A sill at 1.7 m or higher avoids the rule for that window, but it also means you cannot see out while sitting. Our window replacement guide, linked above, has the full rule, including the extra barrier needed when a restrictor can be removed or released.

How do I measure for a replacement window?

Measure the old frame, height first and then width, in millimetres. Check the width at the top and bottom and the height at both sides, and use the smallest number.

Then check which measurement your supplier's chart uses. Suncoast's Queensland chart adds 50 mm to the frame size for the stud opening, in both height and width. A&L's chart uses the overall reveal size. Give the supplier the measurement their chart asks for.

If your opening is not on any chart, you have two choices. Suncoast says non-standard sizes are available on request. Or a carpenter can reframe the opening to take a stock size, which is worth looking at when the frame or sill is damaged anyway.

Changing a door at the same time? Our guide to standard door sizes in Australia covers the heights and widths.

Who installs windows in Queensland?

A carpenter fits the window and the framing around it. The glass is a glazier's job. The QBCC carpentry licence covers "Install windows and doors including framing", and restoring windows and frames. The QBCC glass, glazing and aluminium licence covers glazing and reglazing, and making and installing windows and doors.

The QBCC's fact sheet says the installer should get the details to fit each window correctly, including the size and number of fixings to suit the window size and the wind speed. Building work over $3,300 needs a QBCC licence of the right class.

We fit windows and doors across the Gold Coast, along with the framing, sills and timber around them. The glass itself is glazing work, done by a licensed glazier. See our carpentry work for the jobs we do.

Where do these sizes come from?

Checked on 18 October 2026: Suncoast Windows' Queensland size range catalogue (revision 7) and its Queensland awning and louvre window charts (undated); Bradnam's awning window standard sizes for Queensland and NSW (undated); A&L Windows' standard sliding windows chart (February 2023); the QBCC fact sheet on selection criteria for windows and glazed external doors (October 2022), its carpentry and glass, glazing and aluminium licence pages (August 2021) and its when you need a licence page (August 2021); and the National Construction Code 2022 Housing Provisions Parts 10.5, 10.6 and 11.3. We will check these sizes again every three months.

See our carpentry work, or check what your job will cost.