Cost of New Windows & Doors in the UK (2025)
A uPVC casement window costs £400–£700 supply and fit. A full house of windows ranges from £4,000–£12,000. A composite front door costs £800–£2,000 installed.
uPVC vs aluminium vs timber
uPVC is the most affordable and low-maintenance option, suitable for most homes. Aluminium is slimmer, more modern-looking, and longer-lasting but costs 20–40% more. Timber is traditional, beautiful, and can be painted any colour, but requires more maintenance. For period properties, timber or aluminium slim-profile windows often look more appropriate.
FENSA registration
Window and door replacements are notifiable under Building Regulations. FENSA or CERTASS-registered installers can self-certify the work and issue a compliance certificate — which you will need when selling. Unregistered installations may require a local authority inspection.
Cost Breakdown
All prices are indicative UK averages for 2025. Actual costs vary by location, specification, and contractor. London and South East rates are typically 20–35% higher.
| Item | Low | High |
|---|---|---|
| uPVC casement window | £400 | £700 |
| Aluminium casement window | £600 | £1,000 |
| Bay window | £1,200 | £2,500 |
| Composite front door | £800 | £2,000 |
| Bi-fold doors (3 panels) | £3,000 | £6,000 |
| Full house (10 windows) | £4,000 | £10,000 |
What Affects the Cost?
- ✓Material — uPVC, aluminium, or timber
- ✓Number and size of windows
- ✓Style — casement, sash, bay, or tilt-and-turn
- ✓Glass specification — triple glazing costs more
- ✓Ease of access and removal of old frames
Get Free Quotes for This Work
Post your job on Quote2 and receive up to 3 quotes from local, reviewed tradespeople. Free for homeowners.
Post a Job — It's FreeFrequently Asked Questions
How long do new windows last?
uPVC windows typically come with a 10-year guarantee and last 20–30 years. Aluminium and timber can last 40+ years with proper maintenance.
Do I need planning permission for new windows?
Replacing like-for-like windows in the same style does not usually need planning permission. However, properties in conservation areas or listed buildings may require consent. FENSA-registered installers will advise.