Property-type budget · 2026
Semi-Detached House Window Replacement Cost
A semi-detached house usually has an extra side elevation compared with a terrace, so the window count is often higher. Side landing, kitchen and bathroom openings can add several units before front bays or rear doors are considered.
Quick price answer: Eight medium standard uPVC windows model at £2,674–£4,859, nine at £3,009–£5,467 and twelve at £3,923–£7,127 at UK-average pricing.
Semi-detached project examples
Use these as count-based starting points rather than a fixed house price.
Figures are modelled UK-average fitted-market estimates from the Window Price Calculator engine, using its 24 September 2026 research refresh. They include ordinary removal, standard fitting, basic making good and VAT; scaffolding, hidden structural repairs and highly bespoke work can sit outside the range.
Why semis vary so much
Two visually similar houses can still have different replacement schedules.
Side elevation
A side-facing landing, bathroom or kitchen can add windows that a mid-terrace simply does not have.
Extensions and doors
Rear extensions can add extra windows plus French, patio or bifold doors. Price those products individually rather than assuming they sit inside the house-window average.
What to count before requesting quotes
A quick walk around the property makes the budget much more useful.
- Front and rear windows on every storey.
- All side elevation windows.
- Any bay window or bow window.
- External glazed doors being replaced at the same time.
Use your own project
Start a replacement estimate.
Use the calculator to price a complete replacement window or door. Choose the closest product and project size and we’ll carry those choices into the full calculator.
Rough sizes are fine. The full personalised result is unlocked after the £2.99 checkout.Related price guides
Use the closest related guide to compare another specification or project type.
Questions people ask
How much are new windows for a semi-detached house?
For roughly eight to twelve medium standard uPVC windows, the current model spans £2,674–£4,859 to £3,923–£7,127 at UK-average pricing.
How many windows should I assume for a semi?
This guide uses eight to twelve only as an illustrative range. Count the actual openings because extensions, side elevations and bays create large differences.
Can I add doors to the same estimate?
Yes. The calculator supports mixed projects, so windows and doors can be priced together.
Turn the property type into an actual item list.
Use nine windows as a starting point, then edit the count and add any bay or door products separately.
Start my estimate · £2.99