UK cost guide · Updated 30 Sep 2026
Sash Window Cost Calculator
A sash window cost calculator needs more than one average. Size, material, glazing and heritage-style details can move the fitted total sharply, so these benchmarks show the range before you build your own specification.
Current fitted examples
These figures use the same pricing model as the main calculator. They are market benchmarks for quote checking, not binding installer quotations.
How to use the calculator benchmarks
Start with the nearest frame size, then keep the material and glazing specification aligned with the quote you are checking. A timber sash should not be compared with a standard uPVC sash simply because the dimensions are similar.
The main calculator can then apply your region and project quantity rather than treating every sash window as a one-off national average.
What changes sash-window cost most
- uPVC, aluminium or timber frame material
- Exact width and height
- Double or triple glazing
- Glazing bars, heritage details and colour
- How many windows are being replaced in the same project
What “fitted” means here: supply, standard replacement installation and ordinary 20% VAT are included. Structural alterations, scaffolding, difficult access and highly bespoke work can sit outside the standard estimate.
Related price guides
Use these pages to compare the nearest specifications before building your own estimate.
Questions people ask
Direct answers to the search questions behind this guide.
How much does a typical uPVC sash window cost?
A common 900 × 1200 mm white uPVC sash currently centres around £915 fitted in the national model.
Can the calculator estimate timber sash windows?
The site can model premium materials, but timber sash work can vary more widely because joinery, conservation details and finish have a large effect on the quote.
Does the sash estimate include fitting and VAT?
Yes. The fitted examples include standard replacement installation and ordinary 20% VAT.
Price the actual project.
Choose the product, rough or exact size, layout, glazing, colour and region. The personalised result is a one-off £2.99.
Open the price calculator →