Average Window Replacement Costs Across the UK
The average cost to replace all windows in a UK three-bedroom semi-detached house ranges from £3,500 to £7,500 depending on material and glazing type. Individual window prices vary from £300 to £1,200 based on size, style, and specification.
According to data from the Federation of Master Builders, uPVC remains the most affordable option while aluminium commands a premium of 30-50% over uPVC for equivalent specifications.
Window Prices by Material Type
| Material | Cost Per Window | Lifespan | Maintenance |
|---|---|---|---|
| uPVC | £300-£600 | 20-25 years | Low |
| Timber | £500-£900 | 30-60 years | High |
| Aluminium | £500-£1,000 | 30-45 years | Very low |
| Composite | £600-£1,200 | 35-50 years | Low |
Factors That Affect Your Quote
Window size is the primary cost driver. A standard 1200mm x 1200mm casement window costs 40-60% less than a 1800mm x 1200mm bay window. Upper floor installations cost more due to scaffolding requirements, typically adding £500-£1,000 to a whole-house project.
Regional pricing varies by up to 25%. London and the South East command the highest prices while the North East and Wales tend to be more affordable.
Hidden Costs to Budget For
Scaffolding adds £300-£800 for upper floor access. Removal and disposal of old windows costs £50-£100 per window. Making good plastering and decoration around new frames typically adds £30-£60 per window. Building regulations certificates through FENSA cost the installer approximately £60 per installation, usually included in the quote.
How to Save Money on New Windows
Order all windows together rather than room by room to reduce installation visits. Choose standard sizes over bespoke measurements where possible. Consider the Great British Insulation Scheme for potential funding. Get quotes from at least three TrustMark registered installers and ask about seasonal discounts during quieter periods from November to February.
