How much do new windows cost?
It is the first question every homeowner asks, and the honest answer is a range rather than a single number. As a broad UK guide, a supplied-and-fitted uPVC casement window sits in the region of £300–£520 each. Scale that up and a typical eight-window semi-detached replacement often lands somewhere around £2,700–£4,500, before any bay windows or doors are added. Those figures are typical ranges to help you plan — not a promise, and not a quote.
What sits behind the headline number
A quote is really a stack of line items. Start with the per-window supply-and-fit cost, multiply by how many windows you are replacing, then add a realistic allowance for access, scaffolding where needed, and waste removal. Building the figure up this way makes it far easier to spot a quote that is unusually high or suspiciously low. Our cost per window guide walks through that maths in detail.
Typical UK ranges by project
| Project | Typical range |
|---|---|
| Single uPVC casement, supply & fit | £300–£520 |
| Three-window terrace frontage | £1,100–£1,900 |
| Eight-window semi-detached | £2,700–£4,500 |
| Front brick bay window | £1,400–£2,800 |
| uPVC French doors to garden | £1,200–£2,400 |
These are illustrative typical ranges gathered from common UK project types. Aluminium and timber frames sit higher than uPVC for the same opening, and triple glazing or acoustic glass will nudge each figure upward.
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Why quotes vary so much
The biggest swing factors are frame material, glazing specification, window sizes and access. Upper-floor windows that need scaffolding cost more to fit than ground-floor openings, and shaped or heritage-style windows use more material and labour than a plain casement. Colour matters too: woodgrain foils and dual-colour finishes usually carry a modest premium over standard white. Our guide to whole-house window cost shows how doing everything at once can improve the rate.
If you would rather see a straightforward quote from an installer, you can get a straightforward window quote and compare it against the ranges above.
From estimate to firm price
Use the ranges here to set your expectations, then request quotes so a vetted local installer can survey your home. A survey accounts for the details a table never can — exact sizes, sill condition, access and the glass you actually want — and turns a ballpark into a written, itemised price you can rely on.
Compare free, no-obligation quotes from vetted local installers.
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