How much do double-glazed windows cost in Melbourne?

Budget roughly $800-$2,000 per typical residential window installed, or $15,000-$40,000+ for a whole house, depending on size, frame (aluminium vs uPVC vs timber), access and WERS rating. Coastal and upper-storey jobs cost more. Always confirm whether removal, make-good and flashing are in the quote.

What is a WERS rating and what should I look for?

WERS (Window Energy Rating Scheme) rates the whole window, not just the glass. For Victorian Energy Upgrades (VEU) pathways, providers typically look for heating stars of 4 or higher and a Total Window U-value of 4.0 or lower. Ask for the WERS sticker on the actual product, not a generic brochure U-value.

Can I get a Victorian rebate for double glazing?

Victorian Energy Upgrades (VEU) offers discounts on eligible double-glazed or secondary-glazed products installed by an accredited provider. Amounts move with certificate prices. Check the official register and use a VEU-accredited installer. Start at energy.vic.gov.au window glazing discounts. We can advise which of our systems are eligible; we will not invent a rebate that the product cannot claim.

Should I replace windows or add secondary glazing in a heritage house?

If a heritage overlay blocks frame replacement (common in parts of Toorak, Balwyn, Hawthorn and inner terraces), secondary glazing that creates a sealed air gap is the usual path and can still qualify under VEU as a thermally efficient window product. If you can replace frames, a proper double-glazed unit performs better and looks cleaner.

Energy-Efficient Windows Melbourne | Double Glazing, WERS, VEU

Q: Is double glazing worth it in Melbourne?

For owner-occupiers staying 5+ years, yes for comfort and condensation, even when the energy-bill payback is 8-15 years. Melbourne is NCC Climate Zone 6: you heat and cool. Single glazing is a cold radiating surface in winter. Double glazing keeps the inner pane closer to room temperature, which is why sill puddles stop. Pair it with ceiling insulation and draught sealing or you will overspend on glass.

Is double glazing worth it in Melbourne?

Forum consensus on r/AusRenovation and Whirlpool is consistent: people notice comfort before they notice the bill. Single-glazed aluminium windows feel like a fridge door in July. Double glazing raises the inner surface temperature, so you can sit next to the glass. Condensation on sills (the mould starter kit in Victorian winters) drops hard.

Melbourne sits in NCC Climate Zone 6. You pay to heat and to cool. Double glazing cuts both, but it is not a magic fix. If the ceiling is uninsulated and every skirting leaks, fix those first. Glass cannot outrun a hole in the building fabric. Source context: ABCB / NCC.

What people on forums get stuck on

"Payback looks terrible." True if you only count kWh. False if you count condensation, street noise (St Kilda, Richmond, CBD fringe) and being able to use the room. Count 5+ years of occupancy.
"Secondary glazing is a scam." It is not, when a heritage overlay blocks frame replacement. It is a sealed extra pane, not cling film. Performance is below a new double-glazed unit but well above single glass.
"uPVC vs aluminium." uPVC usually wins on U-value. Aluminium with a thermal break is the coastal and apartment-spec favourite (Brighton, Port Melbourne, Docklands) because of durability and body-corporate rules. We will not force uPVC onto a streetscape that will reject it.
"Just film the glass." Retrofit film is not double glazing. It can cut summer gain. It will not fix winter radiant cold the way an IGU (insulating glass unit) does.

WERS stars, not brochure glass

Ask for the Window Energy Rating Scheme rating of the whole window (frame + glass + spacer). Glass-only U-values are how average products get sold as high performance. For many VEU claims you want heating stars of 4 or more and a total window U-value of 4.0 or lower. Confirm on the product register, not a flyer.

Official VEU window discounts: energy.vic.gov.au window glazing discounts. Certificate prices move; treat dollar amounts as indicative.

Which rooms to upgrade first

Priority	Room / orientation	Why
1	West-facing living (Doncaster, Glen Waverley, Balwyn hills)	Summer heat load. Melbourne west sun cooks single glazing.
2	South bedrooms and south living	Winter radiant cold and condensation on sills.
3	Street-facing rooms (St Kilda, Richmond, CBD fringe)	Noise. Laminated IGUs help more than thin air gaps.
4	Coastal elevations (Brighton, Elwood, Port Melbourne, Mornington)	Salt + wind. Spec durable frames and decent seals, not just Low-E glass.
5	Small high windows / bathrooms	Often last. Condensation here is also a ventilation problem.

Double glazing vs secondary glazing

Option	Best when	Watch-outs
New double-glazed windows	You can change frames; owner-occupier 5+ years	Quote must include removal, flashing, make-good
Secondary glazing	Heritage overlay, rental, or one bad room	Must be a sealed system; DIY film is not the same
IGU retrofit into existing frames	Frames are deep enough and in good condition	Many old aluminium frames are not; measure first

Process, costs and install steps: upgrading to double glazing.

How we service suburbs from Footscray

Workshop: 1 McNab Avenue, Footscray VIC 3011, 50km radius.

Brighton, Elwood, Port Melbourne, Mornington: coastal hardware and powdercoat that copes with salt. Pair window upgrades with door seals; a leaky sliding door undoes good glass.
Toorak, Balwyn, Hawthorn, Kew: check overlays before ripping frames out. Secondary glazing keeps streetscape intact.
Doncaster, Templestowe, Glen Waverley: large west glass is common on brick veneers. Prioritise those elevations for Low-E IGUs.
Footscray, Yarraville, Seddon, Maribyrnong: weatherboard stock with single-glazed aluminium from the 80s/90s. Whole-house programs work if insulation is already done.

Suburb pages: locations index. Service: windows and doors.

Do not skip ventilation

Sealing a damp house without ventilation moves moisture into walls. If sills currently puddle, fix glass and also run extract in wet areas. Double glazing reduces the cold surface. It does not replace an exhaust fan.

Part of our Glass & Glazing Guide. Explore all articles on this topic.

Energy-Efficient Windows in Melbourne: What Is Actually Worth Doing