Windows are often the biggest source of draughts and heat loss in an Australian home during winter, especially in older houses with single glazing, worn seals or lightweight curtains. The good news is that you can make a noticeable difference without a full window replacement. A mix of simple fixes, better coverings and the right upgrades can help keep warmth in and cold air out.
Start By Stopping Draughts Around The Window
Before you spend money on new glass, check whether air is sneaking in around the frame, sash or latch. Even a small gap can undo the benefit of heating. On a windy winter night, place your hand near the edges of the window to feel for cold air movement.
Common draught-proofing options include:
- Weather seals for hinged or sliding windows
- Gap filler strips for loose frames and moving parts
- Brush seals for sliding window tracks
- Sealant or caulk for fixed gaps around the frame
Many of these products are available at Bunnings and Mitre 10. If you are sealing around the outside of a window, make sure the product is suitable for exterior use and compatible with your frame material. If the frame is rotten, corroded or badly damaged, sealing alone will not solve the problem and a carpenter or window specialist should inspect it.
Use Curtains, Blinds And Pelmets The Right Way
Window coverings can make a major difference to winter comfort, particularly in colder parts of Victoria, Tasmania, southern New South Wales, the ACT and elevated areas elsewhere. The aim is to create a still layer of air between the room and the glass.
For better heat retention:
- Choose heavy, lined curtains that fit close to the wall
- Extend curtains beyond the window frame where possible
- Keep curtains closed after sunset and open them on sunny days
- Add a pelmet or top treatment to reduce warm air escaping at the top
- Use close-fitting blinds in rooms where curtains are not practical
Thermal or blockout curtains are usually more effective than lightweight fabrics. If you are replacing old window furnishings, look for options sold by Australian retailers such as Spotlight or major hardware stores, and choose products sized to minimise side and top gaps.
Upgrade The Glass Without Replacing The Whole Window
If your windows are letting in plenty of cold, there are several upgrade paths before you commit to a full frame replacement. The best option depends on the window type, condition and your budget.
| Option | What It Does | Best For |
|---|---|---|
| Window film | Adds a thin insulating layer and can reduce draughtiness and condensation | Renters or homeowners wanting a simple improvement |
| Secondary glazing | Creates another layer of acrylic or glass inside the existing window | Older homes and heritage properties |
| Double glazing | Improves insulation by using two panes with an air or gas gap | Major upgrades and long-term comfort |
Window film and secondary glazing can be useful where replacing the whole window is not practical. For a more substantial result, double glazing is usually the best performer, especially in windy or colder parts of the country. If you are considering new windows, ask about frames, sealing quality and compliance with the National Construction Code.
Improve The Surrounding Area Inside The Room
Sometimes the window itself is only part of the problem. Heat can be lost through nearby cold surfaces and poor airflow, making the room feel colder than it really is.
- Move furniture away from windows so warm air can circulate
- Close internal doors to keep heat in living zones
- Use rugs on hard floors near windows if the room feels chilly underfoot
- Keep curtains from covering heaters or vents in a way that blocks airflow
- Check that architraves and trim are not hiding cracks that need sealing
If you have condensation forming on the glass, that can point to high indoor moisture and poor ventilation. Use exhaust fans where fitted and ventilate bathrooms and kitchens properly. If condensation is severe, a builder, glazier or suitably licensed professional may need to assess whether the window system is underperforming or whether there are broader moisture issues in the home.
When To Call A Professional
Many draught-proofing jobs are straightforward, but some window repairs are best left to a qualified tradesperson. In Australia, work involving glazing, structural alterations, electrical connections for automated blinds, or any gas or plumbing-related changes must be done by the appropriately licensed professional under state and territory rules.
Call in a professional if:
- The window frame is warped, rotted or leaking
- Glass is cracked, loose or difficult to secure
- You want double glazing or secondary glazing fitted properly
- There is visible water damage around the opening
- You are unsure whether the window is compliant with current standards
A licensed carpenter, glazier, builder or window installer can advise whether repair, resealing or replacement is the smartest long-term option. It is also worth checking that any installer understands local conditions, from coastal corrosion to bushfire-prone areas where compliant materials may be required.
If you are weighing up the best approach, start with the low-cost fixes first: seal the gaps, improve your curtains and add insulation where it is missing. Then reassess the room’s comfort before moving to bigger upgrades. For homeowners wanting a practical path forward, a local trade can help you choose the right solution for your home and climate.
For broader home improvement ideas and trade advice, you can also visit Trade Directory NZ.
Ready to improve winter comfort at home? Find qualified local trade professionals on Aussie Trade Directory and get the right help for your windows.