How much does one window cost?

If you only need a window or two replaced, the whole-house figures you see online are not much help. Here is what a single replacement window typically costs in the UK, broken down by material and style — all indicative, so you can budget sensibly before you ask for a quote.

There is no fixed price for “one window” because so much depends on the frame, the glass and the opening. A small uPVC casement in a standard opening sits at the affordable end; a large sash or a shaped unit in a hard-to-reach spot costs considerably more. The ranges below assume supply and fit by a professional installer, including removing the old unit and making good.

Indicative cost per window

Ballpark figures only — not a quote, offer or savings claim.

Window type	Typical indicative range (supplied & fitted)
Small uPVC casement	£400–£650
Medium uPVC casement	£550–£850
uPVC sash window	£700–£1,200
Aluminium casement	£750–£1,300
Timber or timber-alternative	£900–£1,600

Unit price usually drops per window when you replace several at once, because the installer only mobilises, sets up and clears away once. That is why doing a whole elevation together tends to work out better value than a window here and there.

What moves the per-window price

• Material: uPVC is the value option; aluminium and timber add a premium for looks and slimmer sightlines.
• Size: larger sashes use more glass and are heavier to handle.
• Glazing: acoustic glass, toughened or laminated safety glass and triple glazing all add cost.
• Style and finish: sashes, shaped heads, coloured frames and Georgian bars cost more than a plain white casement.
• Access: upper-floor windows that need scaffolding carry extra labour.

Material choice is where people over- or under-spend most often. It is worth understanding which window materials give best value for your style of home before you settle on a spec.

Getting an accurate number

The ranges here are a starting point, not a promise. A proper price comes from a measured survey where the installer checks the opening, the reveal and the access. For the full picture across a whole property, see the window replacement cost guide, or if you have a bay to sort, read our bay window replacement cost page. When you want tailored figures, we can get matched with window installers in your area so you can compare like for like.

If cost is the sticking point, remember you do not have to pay it all at once — funding and contribution options may be available, subject to eligibility and a home survey. See what affects window prices for the factors behind your figure.

What a fitted price should include

A proper supply-and-fit price is more than the window itself. It should cover careful removal of the old unit, fitting and sealing the new frame, internal and external trims, and clearing the old materials away. If a quote looks unusually low, check what has been left out — our page on hidden costs to watch for lists the extras that are easy to miss. Comparing on a like-for-like basis is the only way a per-window figure means anything, so make sure every quote covers the same work before you judge it on price.