UK cost calculator guide · Updated 29 Sep 2026
Aluminium Window Cost Calculator UK
Aluminium windows usually cost more than standard uPVC, so a generic window average is not very useful. Current fitted model centres range from about £874 to £1,222 across common aluminium sizes, with a 1200×1200 example around £1,072.
Current fitted examples
These benchmarks use the same current pricing model as the main calculator. They are market estimates, not installer quotations.
Why aluminium needs its own calculator
Aluminium uses different frame systems, fabrication and hardware from standard uPVC. The cost also reacts differently to size, special finishes and glazing upgrades, so applying a generic “window price” can understate the likely fitted figure.
Inputs that matter most
- Width and height
- Opening layout
- Standard or special colour
- Double or triple glazing
- Region and number of windows
The calculator combines these instead of relying on one national average.
What “fitted” means here: supply, standard replacement installation and ordinary 20% VAT are included. Unusual access, scaffolding, structural repairs, planning/listed-building requirements and highly bespoke work can sit outside the standard estimate.
Related price guides
Use these alongside the calculator to compare nearby specifications and project types.
Questions people ask
Direct answers to common cost-calculator searches.
How much is a 1200×1200 aluminium window?
The current national fitted centre is about £1,072 for a standard-colour double-glazed example.
Are aluminium windows more expensive than uPVC?
For comparable standard replacements, they usually are because the frame system and fabrication cost more.
Can I use rough sizes in the calculator?
Yes. Rough sizes work, while exact measurements can narrow the estimated range.
Calculate your own project.
Choose the product, rough or exact size, configuration, glazing and region. Your one-off personalised result costs £2.99.
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