How Much Does It Cost to Replace All Your Windows?
Whole-house replacement costs by property size, the real saving from doing every window at once, what a full-job quote should include, and how to stage it sensibly if you cannot do it in one go.
Key takeaways
- Replacing every window in a three-bedroom house typically costs £4,000 to £9,000 supplied and fitted.
- A single visit is usually 10% to 20% cheaper per window than replacing in stages.
- Scaffolding, disposal and making good are the fixed costs that make a full-house job better value.
- Expect two to four days on site for a typical house, plus four to eight weeks of lead time before fitting.
Replacing every window at once is the biggest single purchase most homeowners make after a kitchen or a bathroom. It is also the version of the job where pricing is most opaque, because the quote is large, the specification is long and the sales pressure is highest. This guide breaks down what a full replacement actually costs and what should be in the price.
Cost to replace all windows, by house size
| Property | Windows | Typical range |
|---|---|---|
| 1-bed flat | 3 to 4 | £1,600 – £3,500 |
| 2-bed terrace | 5 to 6 | £2,800 – £5,500 |
| 3-bed semi | 7 to 9 | £4,000 – £9,000 |
| 4-bed detached | 10 to 14 | £7,000 – £15,000 |
| 5-bed detached | 15 or more | £9,000 – £20,000 |
| Bungalow | 6 to 10 | £3,200 – £8,000 |
Add 5% to 10% if you are including a front and back door, and more again for a composite door at £900 to £2,500 fitted. Add 40% to 100% for aluminium rather than white uPVC.
Where the money actually goes
| Element | Share of a typical quote |
|---|---|
| Frames, glass and hardware | 45% – 60% |
| Labour and installation | 25% – 35% |
| Scaffolding and access | 3% – 10% |
| Removal and disposal | 2% – 5% |
| Making good and sealant | 2% – 5% |
| Certification and guarantee provision | 1% – 3% |
Is it cheaper to do them all at once?
Almost always, yes. Expect to save 10% to 20% per window compared with replacing in two or three stages, and considerably more if staging would mean hiring scaffolding twice. There is also a practical argument: mixed ages of window make the house look patchy, and older units start failing before you have finished the programme.
There are two good reasons to stage the work anyway. One is budget: no discount is worth a loan you cannot service. The other is condition: if the rear windows are sound and the front elevation is the problem, fixing the front first is sensible.
If you have to stage it, stage it like this
- Do all windows on the same elevation together, so the house looks consistent from the street.
- Do every window that needs scaffolding in one visit, because that is where the duplicated cost sits.
- Replace the worst-performing rooms first: north-facing, single-glazed or misted units.
- Order the front elevation and door together, as they carry the kerb appeal.
- Keep the same profile and colour across stages, even if the installer changes.
What a full-house quote should include
- An itemised list of every opening, its size, style and whether it opens.
- The frame profile and glass specification, with the energy rating for each unit.
- Scaffolding, and who arranges it.
- Removal and disposal of the old windows and any redundant materials.
- Internal and external making good, including plasterwork, trim and sealant.
- Structural work if any bay roofs, lintels or openings are affected.
- FENSA or CERTASS registration and the building regulations certificate.
- The insurance-backed guarantee, how long it runs and what it covers.
- Lead time, installation duration and the payment schedule.
The bottom line
Budget £4,000 to £9,000 for a typical three-bedroom house, and expect the per-window price to fall as the job gets bigger. Get three itemised quotes for the whole house rather than a per-window estimate, and make sure each one covers disposal, making good, certification and scaffolding before you compare the totals.
Frequently asked questions
Two to four days on site for a typical three or four-bedroom house, depending on the number of openings and the scaffolding. Bays and doors add time.
No. Fitters work room by room and each opening is usually closed again the same day. Clear access to each window, take down curtains and move fragile items, but you can stay in the property.
Yes, and it is often cheaper. Installation is quicker than most people expect, and a reputable team will seal each opening as they go. Very high winds or heavy rain may push the date back.
The energy saving alone rarely repays a full-house installation, but the comfort gain is immediate and the per-window cost is at its lowest. If your windows are already failing, replacing them together avoids paying twice for access.
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