Window Replacement Cost Calculator

What does the Window Replacement calculator estimate?

The Window Replacement calculator gives you a realistic, independent cost range for this project in the UK, based on the answers you give about your property and the work involved. It is designed to be a starting point before you contact a tradesperson — not a replacement for a written quote.

How we calculate your estimate

We start from a base cost range for window replacement in the UK of £2,800 – £9,500, built from published trade pricing and typical window replacement project scope. That range is then adjusted by the four answers you give in the calculator above, and — if you pick a region — by a local cost multiplier. On a typical project, around 35% of the total is labour, 60% is materials, and the remainder covers small additional costs. Our full methodology covers this process for every calculator.

• Project size: A rough sense of scale so the estimate isn't based on an average job.
• Property type: Larger or harder-to-access properties usually cost more to work on.
• Finish / material quality: Budget, mid-range, and premium materials carry different price points.
• Site accessibility: Difficult access (tight streets, no parking, upper floors) adds labour time.

Example calculation

For a medium-sized, standard-finish window replacement project on a typical home with moderate site access, the calculator returns £2,940 – £9,980, with a typical cost of £6,460 (£3,880 materials, £2,260 labour, £320 additional costs). Change your answers above to get a range for your own project.

Limitations

This tool provides an independent, general estimate — not a quote, bid or binding price. It can't account for hidden structural issues, permit costs in your specific area, or a particular tradesperson's pricing. See our methodology for how every calculator on HomeCostly is built and reviewed, and our corrections policy if you think a figure needs updating.

Read the full Window Replacement Cost Guide guide for a deeper breakdown.