Cost per window: worked examples
Thinking about the cost per window is the clearest way to sense-check any quote. Instead of reacting to one big total, you break it into a per-unit rate you can compare against typical UK figures. As a guide, a supplied-and-fitted uPVC casement window sits in the region of £300–£520 each, with larger, shaped or upper-floor windows sitting toward the top of that band.
The per-window maths
Every quote can be rebuilt from three numbers: the per-window supply-and-fit rate, the quantity, and a project allowance for access and waste. Here is a worked example for a typical semi:
| Line item | Figure |
|---|---|
| Per window, supply & fit (typical) | £300–£520 |
| Windows | × 8 |
| Access & waste removal (allowance) | £250 |
| Typical project range | £2,700–£4,500 |
If a quote works out far above or below your per-window benchmark, that is your cue to ask why — it might be a different glass spec, a colour finish, or scaffolding you had not accounted for.
What pushes the per-window figure up
- Size: a large living-room window uses more frame and glass than a small landing window.
- Style: sash, shaped-head and flush-fit designs cost more than a plain casement.
- Glazing: triple glazing, acoustic or toughened glass each add to the unit price.
- Colour: woodgrain foils and dual colours typically carry a modest premium over white.
- Floor level: upper-floor windows that need scaffolding raise the fitting share.
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Comparing quotes like for like
When you gather quotes, convert each total back to a per-window figure and make sure you are comparing the same specification: the same frame material, the same glazing, the same colour and the same number of openers. A cheaper headline total can hide a lower spec, while a higher one may include better glass or a longer guarantee. Our uPVC window cost estimates give you a clean baseline to measure against.
Remember that per-window rates usually improve on larger jobs. A single replacement carries the installer’s full set-up cost, whereas a whole-house project spreads that across many windows — see how much new windows cost for the bigger picture.
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