Key Takeaways
Standard aluminium window replacement is usually more affordable than custom timber, large-format, double-glazed, or high-access window work.
Glazing type, frame material, waterproofing, access, and whether old frames need repair can materially affect the final cost.
Double glazing and energy-efficient windows can cost more upfront but may improve comfort, noise control, and thermal performance.
A clear quote should state whether supply, removal, installation, sealing, flashing, disposal, and making-good work are included.
Overview
Window replacement costs depend on window size, frame material, glazing type, access, custom measurement, waterproofing, flashing, removal of old windows, frame repair, safety glass requirements, and whether the quote includes supply, installation, sealing, disposal, and making-good work.
1. Typical Window Replacement Costs
Window replacement costs vary depending on window size, glazing type, frame material, access, custom measurement, removal work, waterproofing, and whether making-good work is included.
Small Standard Window
$650 – $1,200 per window
Basic window supply and installation for standard sizing, simple access, and minimal frame repair.
Medium Aluminium Window
$1,200 – $2,200 per window
Common residential replacement window with removal, installation, sealing, and standard glazing.
Large / Double-Glazed / Custom Window
$2,200 – $3,500+ per window
Large, custom, double-glazed, difficult-access, or energy-efficient window replacement.
2. What Affects the Cost?
The biggest price differences usually come from custom sizing, double glazing, upper-level access, timber or aluminium frame choice, waterproofing detail, and whether the surrounding frame needs repair.
Window Size & Type
Sliding, awning, fixed, louvre, bay, and custom windows have different frame, hardware, and installation requirements.
Glazing Choice
Single glazing, safety glass, laminated glass, double glazing, and acoustic glass can change the quote significantly.
Frame Condition
Rot, water damage, out-of-square openings, or damaged reveals may require repair before installation.
Access & Waterproofing
Upper-level access, scaffolding, flashing, sealing, and making-good work can add labour and risk.
3. Cost Breakdown
A window replacement quote usually includes the window unit, removal of the old window, installation labour, sealing, flashing, frame adjustment, disposal, and possible finishing work.
Total
$2,500
Window Supply
$1,200
48%
Installation Labour
$650
26%
Sealing & Waterproofing
$250
10%
Frame Repair / Making Good
$250
10%
Removal & Disposal
$150
6%
4. Double Glazing and Energy Efficiency Checks
Energy-efficient windows can improve comfort, but the quote should explain exactly what type of glazing and frame system is being supplied.
Double glazing, laminated glass, low-e coatings, acoustic glass, and thermally improved frames can all affect cost and performance. A quote should specify the glazing type, glass thickness, frame system, hardware, warranty, and installation method.
If the goal is noise reduction, insulation, or weather protection, ask the installer to explain whether the proposed window system actually addresses that problem. A cheaper replacement may not deliver the improvement expected if sealing, frame condition, or installation quality is poor.
5. Window Replacement Quote Checks
Before accepting a window replacement quote, confirm the product specification and installation details.
Confirm the exact window size, frame material, colour, opening style, and glazing type.
Ask whether removal, disposal, sealing, flashing, and waterproofing are included.
Check whether any frame repair, reveal work, painting, or making-good is included or excluded.
Confirm whether upper-level access, scaffolding, or difficult access costs are included.
7. Questions to Ask Before Replacing Windows
Use these questions to compare window quotes and avoid unclear installation costs.
Does the quote include window supply, removal of the old window, installation, sealing, flashing, disposal, and final cleanup?
What exact frame material, colour, opening style, glass type, and hardware are included?
Is the window standard size or custom measured, and what happens if the opening is not square?
Are waterproofing, flashing, reveal repair, trim replacement, and painting included or excluded?
Does the quote include access equipment, scaffolding, or extra labour for upper-storey windows?
What warranty applies to the window product, glazing, hardware, sealing, and installation workmanship?
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