Window Replacement Cost in Australia 2026: Pricing Guide for Aluminium Window Upgrades

Window replacement is one of the highest-impact, mid-tier-cost renovations available to Australian homeowners. A full-house window upgrade can lift a 1980s brick-veneer to 7-star NatHERS performance, slash summer cooling bills, eliminate condensation, and transform street appeal — but it typically costs between $15,000 and $80,000 for a detached home, depending on size, specification, and the building’s existing fabric. Knowing what you should expect to pay, line by line, is the single most effective way to avoid being over-quoted or under-quoted.

This guide presents the 2026 pricing landscape for aluminium window replacement across Australia. It is built from publicly available rates published by AGWA, NBSA, Master Builders Australia and the HIA, plus indicative project pricing collected from MC Windows & Doors’ 2025–2026 quotation database across Sydney, Melbourne, Brisbane, Adelaide, Perth and regional New South Wales. We focus on aluminium systems because they remain the dominant specification in the Australian replacement market — accounting for roughly 70 per cent of replacement windows installed in detached homes.

The numbers below are indicative supply-and-install rates as of August 2026. Actual project pricing depends on window size, glazing specification, accessibility, BAL rating, coastal proximity, and the quantity ordered. Use this guide to benchmark quotations and to budget for the conversation with your builder or window supplier.

1. Why Replacement Window Costs Vary So Much

Five Drivers of Window Replacement Cost

A $40,000 quote and a $22,000 quote can both be honest prices for the same home, because the unit cost of a replacement window depends on five primary variables:

Window size. A 600 × 600 mm awning window and a 2,400 × 2,100 mm fixed window look like “two windows” to a homeowner but the larger window can cost three to four times as much because of the additional aluminium, glass area, hardware, and transport cost.
Glazing specification. Single glazing, standard double glazing, Low-E double glazing, and triple-glazed Low-E with argon are dramatically different in cost — both in the glass itself and in the wider, heavier frame required to support the heavier glazing.
Frame material. Aluminium is typically the lowest-cost frame material. Timber, fibreglass, and composite frames can add 30 to 80 per cent to the unit cost.
Opening style. Fixed windows are the cheapest because they have no operating hardware. Awning, casement, double-hung, sliding, and bifold windows add progressively more hardware cost.
Installation complexity. A ground-floor replacement on a single-storey home is straightforward. A second-storey replacement with scaffolding, or a heritage home with non-standard openings, can multiply the install cost by two to four times.

Two quotations can both be honest without either being unfair — they may simply be priced on different specifications.

The Hidden Cost: Reveal Repairs and Remediation

Roughly 30 to 40 per cent of total project cost on a typical Australian window replacement is not the windows themselves — it is the reveals, sills, flashings, architraves, and paintwork that the new windows touch. A quote that includes these items will look 30 to 40 per cent higher than a “supply only” quote, but both prices are legitimate for the scope each covers. Always ask the supplier for an itemised quote that separates supply, install, and ancillary works.

2. National Pricing Benchmarks — Per Window

Indicative 2026 Per-Window Pricing (Supply and Install, Single-Storey, BCA Climate Zone 5)

The table below shows indicative per-window supply-and-install prices for an aluminium window in a single-storey brick-veneer home in Sydney, Melbourne or Brisbane. Regional variations are discussed in Section 4.

Window type	Size (mm)	Single glazed	Std double glazed	Low-E double glazed	Triple Low-E + argon
Fixed window	600 × 600	$480–$650	$620–$820	$720–$950	$950–$1,300
Fixed window	1,200 × 1,200	$780–$1,000	$1,050–$1,350	$1,250–$1,600	$1,650–$2,200
Fixed window	2,400 × 1,800	$1,950–$2,500	$2,650–$3,400	$3,100–$4,000	$4,200–$5,500
Awning window	900 × 600	$680–$880	$880–$1,150	$1,050–$1,350	$1,400–$1,900
Awning window	1,500 × 900	$950–$1,250	$1,250–$1,600	$1,500–$1,950	$2,000–$2,700
Casement window	900 × 900	$850–$1,100	$1,100–$1,400	$1,300–$1,650	$1,700–$2,300
Sliding window	1,200 × 1,200	$880–$1,150	$1,150–$1,500	$1,400–$1,800	$1,850–$2,500
Sliding window	1,800 × 1,500	$1,200–$1,550	$1,550–$2,000	$1,850–$2,400	$2,500–$3,400
Double hung	900 × 1,200	$1,100–$1,400	$1,400–$1,800	$1,700–$2,200	$2,300–$3,000
Tilt and turn	900 × 1,200	$1,250–$1,600	$1,600–$2,050	$1,900–$2,500	$2,500–$3,400
Sliding door	1,800 × 2,100	$1,800–$2,300	$2,400–$3,100	$2,900–$3,800	$3,800–$5,200
Bifold door (3 panel)	3,000 × 2,100	$3,500–$4,500	$4,500–$5,800	$5,500–$7,200	$7,200–$9,500
Bifold door (4 panel)	4,000 × 2,400	$5,200–$6,800	$6,800–$8,800	$8,200–$10,800	$10,800–$14,200

These figures include supply, install, standard flashings, internal silicone seal, and one coat of paint touch-up to the reveal. They exclude structural alterations, electrical work for blinds, and major rendering repairs.

What Drives the Range Within Each Cell

The low end assumes a standard colour, a standard hardware grade, and easy site access.
The high end assumes a custom colour, premium hardware (multi-point locking, Grade 316 stainless), restricted site access, or coastal-grade specification.
Non-standard sizes outside the manufacturer’s catalogue range add 10 to 25 per cent to the unit price.

3. Cost of Doors

Aluminium Sliding Doors

Sliding doors are a separate pricing category because of their larger glass area, heavier hardware, and more demanding structural requirements.

Standard sliding door (1,800 × 2,100 mm, single glazed): $1,800–$2,300 supply and install.
Sliding door with Low-E double glazing: $2,900–$3,800 supply and install.
Heavy-duty sliding door (2,400 × 2,700 mm, triple glazing): $4,800–$6,500 supply and install.
Sliding door with lift-and-slide hardware (for very large panels): add $1,200–$2,500 per door.

Bifold Doors

Bifold doors are the most expensive common aluminium door configuration because of the number of panels, the panel hardware, and the more demanding structural design.

3-panel bifold (3,000 × 2,100 mm, Low-E double): $5,500–$7,200 supply and install.
4-panel bifold (4,000 × 2,400 mm, Low-E double): $8,200–$10,800 supply and install.
Corner bifold (two units meeting at a corner, 5,000 mm total span): $14,000–$18,500 supply and install.
Stacking bifold (panels slide into a pocket in the wall): add 20 to 30 per cent to a standard bifold of the same span.

Hinged and Pivot Entry Doors

Single hinged entry door (1,200 × 2,100 mm, Low-E double): $2,800–$3,800 supply and install.
Pivot entry door (1,500 × 2,400 mm, triple glazing): $5,500–$7,500 supply and install.

4. Regional Cost Variations

Sydney, Melbourne, Brisbane (High-Cost Metropolitan)

The figures in Section 2 are most representative of these capitals. Labour rates are higher, but so is the supply competition, so net prices are similar across the three.

Adelaide and Perth (Mid-Cost)

Adelaide and Perth prices are typically 10 to 15 per cent below Sydney/Melbourne/Brisbane for equivalent specifications. The difference comes mainly from labour rate differentials.

Regional New South Wales, Victoria, Queensland

Prices in regional centres can be 5 to 10 per cent higher than the capitals due to transport costs and limited installer competition, except in the immediate orbit of a major regional centre (Wollongong, Geelong, Newcastle, Gold Coast) where pricing matches the capital.

Remote and Far-North Queensland

Cyclone-rated windows cost 15 to 25 per cent more than equivalent non-cyclone windows. The additional cost is in the heavier frame, the debris-rated glass or screen, and the additional installation labour. Expect a 4-panel bifold in Townsville or Cairns to cost $1,500 to $3,500 more than the same bifold in Brisbane.

5. The Cost of Going Beyond Code Minimum

NCC 2022 Section J U-Value Requirements

NCC 2022 specifies maximum total system U-values that vary by climate zone and building class. For most Australian capital city climates:

Climate zone 5 (cool temperate — Melbourne, Hobart): U-value ≤ 2.2 W/m²·K for typical residential glazing.
Climate zone 6 (temperate — Sydney, Adelaide): U-value ≤ 2.4 W/m²·K.
Climate zone 7 (warm temperate — Brisbane, Perth): U-value ≤ 2.7 W/m²·K.
Climate zone 8 (hot — Darwin): U-value ≤ 3.0 W/m²·K.

Standard double glazing with a generic aluminium frame typically achieves Uw ≈ 3.0 to 3.5 W/m²·K. To meet NCC 2022 in zones 5 and 6, the frame must be a thermally broken aluminium system with Low-E double glazing and argon. This is now the baseline specification for most Australian replacement windows.

Cost Premium for Above-Code Performance

Performance tier	U-value (Uw)	Cost vs baseline
Standard double glazed, non-thermally-broken aluminium	3.5	Baseline
Thermally broken aluminium, standard double glazed	2.8	+8 to +12%
Thermally broken aluminium, Low-E double glazed	1.8	+20 to +30%
Thermally broken aluminium, triple Low-E, argon	1.2	+40 to +60%

The triple-glazed tier is rarely justified in Australian capital city climates; the thermal improvement over Low-E double glazing is modest and the cost premium is significant. In most projects, Low-E double glazed with a thermally broken aluminium frame hits the price–performance sweet spot.

6. Cost Premium for BAL Rating

Bushfire Attack Level Upcharges

For homes in BAL-rated zones (approximately 1.2 million Australian homes as of 2026), the replacement windows must meet the bushfire construction requirements of AS 3959. The additional cost varies sharply with the BAL rating:

BAL rating	Cost premium vs non-BAL window
BAL-Low	$0 (no upgrade required)
BAL-12.5	+5 to +10%
BAL-19	+10 to +20%
BAL-29	+20 to +35%
BAL-40	+35 to +60%
BAL-FZ	+60 to +120%

The cost difference comes from the bushfire-resistant glass (toughened or laminated with a specific thickness), the metal-on-metal hardware, the intumescent seals, and (for BAL-FZ) the fully tested window system.

7. Coastal Premium

Within 1 km of the coastal surf line (BCA corrosion category C4–C5), aluminium windows must be specified with enhanced corrosion protection:

Grade 316 stainless steel hardware (vs Grade 304)
Powder coating to AAMA 2604 or AAMA 2605 (vs AAMA 2603)
5-stage pre-treatment including chromate or chrome-free conversion
Salt spray testing to 3,000 hours minimum (vs 1,000 hours standard)

The coastal premium is typically 10 to 20 per cent over an equivalent inland specification. The additional cost is recovered many times over in service life — a Grade 304 inland window in a coastal environment may fail in 5 to 10 years; a properly specified Grade 316 coastal window will last 20 to 30 years.

8. Whole-House Project Costs

Typical Project Sizes

Project type	Number of windows/doors	Indicative total cost (AUD)
1-bedroom apartment	4–6 windows + 2 doors	$8,000–$18,000
3-bedroom single-storey home	8–12 windows + 2 doors	$18,000–$35,000
4-bedroom two-storey home	14–20 windows + 3–4 doors	$35,000–$65,000
Large 5-bedroom home	22–30 windows + 5+ doors	$60,000–$120,000
Heritage home with custom windows	12–18 windows + 2 doors	$50,000–$140,000

These figures include supply, install, flashings, painting and a 10 per cent contingency. They exclude structural alterations, motorised blinds, and major rendering or cladding repairs.

What the Quotation Should Itemise

Request an itemised quotation that breaks the total into at least these lines:

Supply cost — windows and doors only, with each unit priced.
Install cost — labour, scaffolding if required, sealants.
Ancillary works — flashings, reveal repairs, architraves, paint touch-up.
Removal and disposal — old windows and doors, often $80–$200 per opening.
Delivery — especially relevant for regional projects.
Builder’s margin (where applicable) — typically 10 to 20 per cent on top of all the above.

A quote that cannot be itemised in this way is a quote that cannot be benchmarked.

9. Cost-Reduction Strategies That Don’t Hurt Performance

1. Standardise Window Sizes Where Possible

A 1,200 × 1,200 mm window from a manufacturer’s standard catalogue costs 30 to 50 per cent less than a custom-sized 1,180 × 1,210 mm window. Where the architect can adapt the design to standard module sizes, the savings are substantial.

2. Concentrate the High-Performance Specification Where It Matters

A west-facing window receives three to five times the solar load of a south-facing window. Spending the money on a higher-specification west-facing window (lower SHGC, triple glazing if appropriate) and a standard-specification south-facing window is often more cost-effective than specifying the same product for all orientations.

3. Choose Fixed Windows Where You Don’t Need to Open

A fixed window costs roughly half of an equivalent-sized awning or casement window because there is no operating hardware. Where NCC and the room layout permit, use fixed windows to reduce project cost.

4. Schedule the Replacement to Coincide With Other Works

If you are replacing the roof, rendering the walls, or upgrading the air-conditioner, schedule the window replacement in the same project to share scaffolding, painter, and project-management overheads. Bundled projects typically cost 10 to 15 per cent less than the same works done separately.

5. Avoid Premium Brand Names Where the Standard Range Is Sufficient

Some premium window brands command a 30 to 50 per cent price premium for comparable tested performance. For projects where the brand name is not critical (most replacement projects), a mid-tier brand with the same AS 2047 test certificates is often better value.

10. Paying for the Project: Finance, Rebates and Incentives

Home Improvement Loans

Most Australian homeowners fund window replacement through one of three mechanisms:

Refinancing the mortgage to release equity. Interest rates from 5.9 to 6.9 per cent (2026) make this the cheapest large-ticket borrowing for most homeowners.
Home improvement personal loan. Typically 7.5 to 11.5 per cent, but accessible without equity.
Green loan products. Some lenders (CBA, ANZ, Bendigo Bank) offer discounted interest rates of 0.5 to 1.0 per cent below standard variable rates for energy-efficient home upgrades including window replacement.

Government Rebates

There is no universal national rebate for window replacement as of 2026. State-level and utility-level programs come and go; check the Victorian Energy Upgrades program, the NSW Energy Savings Scheme, and the Queensland Energy Saver program for current eligibility. The Australian Small Business and Household Energy Rebate (Commonwealth) is not currently applicable to windows.

Feed-In Tariff Synergy

In homes with rooftop solar, the value of energy savings from a window upgrade is partly captured as increased self-consumption rather than feed-in tariff revenue. A household that previously exported 30 per cent of its solar generation and now exports 20 per cent captures more of the solar value at retail rates. The effective payback period on the window upgrade shortens by 10 to 25 per cent as a result.

11. How MC Windows & Doors Quotes a Replacement Project

MC Windows & Doors approaches each quotation with the following discipline:

Detailed measure — site measure by an experienced measure technician, not a sales rep. Measured openings are digitised into the quoting system.
Performance specification — agreed with the homeowner before pricing, including U-value target, SHGC target, BAL rating if applicable, coastal grade if applicable, and security grade.
Itemised quotation — supply, install, flashings, ancillaries and contingencies separated.
Compliance documentation — AS 2047 test certificates, AS 1288 glass compliance, AGWA membership documentation, product warranty.
Installation timeline — typically 1 to 3 days for a single-storey home, 3 to 7 days for a two-storey home.

For homeowners comparing quotations, MC Windows & Doors’ pricing is positioned at the mid-to-upper end of the indicative ranges above, reflecting the use of AS 2047 tested profiles, multi-point locking hardware, and the full compliance documentation pack at handover.

12. Frequently Asked Questions

How much should I expect to pay for a typical three-bedroom home window replacement in 2026? For a single-storey three-bedroom home with 10 windows and 2 doors in BCA climate zone 5 or 6, Low-E double glazing with thermally broken aluminium, expect $22,000–$35,000 supply and install as a working budget. Two-storey, custom-sized, or high-spec projects run higher.

Is supply-only cheaper? Yes — supply-only windows typically cost 50 to 65 per cent of supply-and-install. But you then need to engage a separate installer, who may not be familiar with the specific product. For non-standard windows the warranty may depend on installation by a certified installer.

Do quotes include GST? Some do, some don’t. Always clarify and confirm whether the quote is GST inclusive or exclusive.

How long does a replacement project take? Measure to delivery is typically 4 to 6 weeks for standard products, 6 to 10 weeks for custom products. Installation on site takes 1 to 3 days for a single-storey home and 3 to 7 days for a two-storey home.

Are there hidden costs? The most common hidden cost is reveal repairs. Removing an old window sometimes exposes damaged plaster or timber reveals that must be repaired before the new window can be sealed. Allow a 10 to 15 per cent contingency on top of the quoted price for these unknowns.

Should I replace all windows at once or in stages? Replacing all windows in a single project is almost always cheaper (one scaffolding setup, one project management overhead, one delivery) and delivers better thermal performance consistency. If budget forces a staged approach, do the north and west elevations first — they are the highest-load orientations.

13. Conclusion

Window replacement in Australia in 2026 is a mature, transparent market once you know what you are looking at. The base price for a Low-E double-glazed, thermally broken aluminium window is in the $1,000–$1,500 per opening range for a typical residential size; the project total for an average three-bedroom home lands in the $22,000–$35,000 range. Coastal and BAL-rated specifications carry legitimate premiums that are worth paying for the service-life benefit. The key to a successful project is an itemised quotation, a clear performance specification, and a contractor who can produce the AS 2047 test certificates on demand.

MC Windows & Doors provides fixed-price itemised quotations based on a detailed site measure, with the full compliance documentation pack and a 10-year product warranty. For a project-specific quotation, request a measure appointment and you will receive a written fixed-price quote within 5 business days.