Window Replacement Guide for Australian Homes

When Should You Replace Windows?

• 1 Windows are more than 20 years old (aluminium seals degrade)
• 2 Draughts are felt near closed windows
• 3 Condensation forms between double-glazed panes (seal failure)
• 4 Windows are difficult or impossible to open and close
• 5 Upgrading from single to double glazing for energy efficiency
• 6 Security upgrade — old single-pane windows are easily broken

Window Types for Australian Homes

• 1 Awning: opens outward from the bottom — great for letting in air while keeping rain out
• 2 Casement: hinged on the side, opens fully — maximum ventilation
• 3 Double-hung: both sashes slide up and down — traditional look, common in heritage homes
• 4 Fixed: no opening — for light and views only
• 5 Louvre: adjustable blades — excellent cross-ventilation, popular in Queensland

Frame Materials Compared

• 1 Aluminium: most affordable, low maintenance, limited thermal performance unless thermally broken
• 2 Thermally broken aluminium: aluminium with insulating plastic break — significantly better thermal performance
• 3 uPVC: excellent thermal performance, no painting required, common in Europe now gaining traction in Australia
• 4 Timber: premium look, good insulation, requires painting or staining every 5-10 years

Glazing Options

Single glazing is standard in most older Australian homes. Double glazing (two panes with a gas gap) reduces heat transfer by approximately 40% and noise by 30-40%. Low-E coating on double-glazed units further reduces radiant heat transfer. Budget: single glazed from $300/window; double glazed from $600/window installed.

Heritage Considerations

In heritage conservation areas, window replacements must match the original window profile, material, and proportion. Aluminium windows replacing original timber sash windows are typically not approved. Consult your council's heritage officer before ordering.