Cost of uPVC Windows in the UK (2025)
A uPVC casement window costs £300–£700 fitted. A full house (10 windows) typically costs £3,000–£7,000 supply and fit.
Types of uPVC windows
Casement windows (side-hinged) are the most common in UK homes and the most affordable. Sash windows (sliding up and down) suit period properties and cost more due to mechanical complexity. Bay windows require specialist measurement and installation. All modern uPVC windows must meet current Building Regulations for thermal performance (minimum U-value of 1.4 W/m²K for replacement windows).
What to look for when getting quotes
Ensure quotes include: FENSA or CERTASS registration (required to self-certify window installation as Building Regulation compliant), removal and disposal of old windows, internal and external finishing, and a 10-year minimum guarantee on the frames and double glazing units. Avoid companies that offer large "discounts" and pressure you to sign on the day.
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 |
|---|---|---|
| Standard casement window (supply & fit) | £300 | £650 |
| uPVC sash window (supply & fit) | £500 | £1,200 |
| Small bay window (supply & fit) | £1,000 | £2,500 |
| Full house (8–10 windows) | £3,000 | £7,000 |
| Triple glazing (per window, premium) | £600 | £1,400 |
| Window board + finishing | £50 | £150 |
What Affects the Cost?
- ✓Number of windows
- ✓Window style — casement, sash, bay, tilt and turn
- ✓Glass type — double or triple glazed
- ✓Frame colour — white is standard; grey or black adds cost
- ✓Whether lintels or brickwork need attention
- ✓Location — London and South East rates are higher
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
Do I need planning permission for uPVC windows?
Usually not — replacing like-for-like windows is permitted development in most properties. However, listed buildings and properties in conservation areas may require planning consent. Check with your local authority first.
How long do uPVC windows last?
Quality uPVC frames last 20–25 years. The double glazing sealed units may fail (misting between the panes) after 10–20 years and can be replaced independently of the frames.
What is a FENSA certificate and do I need one?
A FENSA certificate proves the window installation complies with Building Regulations. You'll need this when selling your home. Always ensure your installer is FENSA or CERTASS registered.