Perth Window Replacement Cost Calculator.Know what it should cost in Perth.

In Perth, window replacement typically costs between $4,725 and $33,600 in 2026, with most projects landing around $13,125. Pricing varies with size, finish level, complexity and your specific site.

In cold-winter cities (Melbourne, Canberra, Hobart) double glazing pays back in comfort and energy. In warm climates the return is smaller but it still reduces noise.

Like-for-like replacement in the existing openings is exempt development in most states. Approval may be needed if you're enlarging openings, changing the street-facing appearance of a heritage-listed home or one in a conservation area, or if bushfire or acoustic ratings apply to your block. Check with your council or a private certifier before resizing anything.

Installers typically fit two to four standard windows a day, so most whole-house jobs finish within a week on site. The longer wait is manufacturing: made-to-measure units, particularly double-glazed or timber, can take several weeks from order to delivery. Structural resizing and two-storey access both slow the install.

A standard quote covers removal and disposal of the old windows, supply and installation of the new units, flashing, sealing and making good the immediate surrounds. Internal repainting, new architraves, blinds or curtains, and repairs to hidden rot found during removal are commonly excluded. Ask each installer to list their exclusions in writing before you sign.

Confirm each quote specifies the same glass (single or double glazed, thickness, low-E coating), the same frame material and finish, and the same inclusions for removal and making good. Windows sold in Australia should comply with AS 2047, and a WERS energy rating lets you compare thermal performance between brands. Compare warranties on the product and the installation separately, as they often come from different parties.

The most common surprises are rot in timber reveals, corroded steel lintels in brick homes, out-of-square openings and asbestos sheeting around windows in homes built before 1990. These are usually charged as variations because they can't be seen until the old window comes out. Setting aside a contingency, and asking the installer to inspect in person before quoting, reduces the risk.