Window Replacement Cost Calculator — UK Prices 2025
Window Replacement Cost Calculator
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Adds ~20% to labour
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How much does window replacement cost in the UK?
Use our calculator above to get an accurate estimate based on your specific requirements. Prices are based on real quotes from UK tradespeople and updated quarterly.
What affects the cost of window replacement?
- Location: London and the South East are 15–40% more expensive than the national average.
- Size and complexity: Larger or more complex jobs cost proportionally more.
- Material quality: Budget, mid-range and premium specifications can vary by 2–3x.
- Time of year: Demand peaks in spring and summer — book in winter for better availability and pricing.
- Access: Difficult access (scaffolding, confined spaces) adds to labour costs.
How to save money on window replacement
- Get at least 3 quotes from different tradespeople.
- Book during quieter periods (January–March for most trades).
- Be flexible on start dates — tradespeople often discount for convenient scheduling.
- Supply your own materials where possible (but confirm with your tradesperson first).
- Combine jobs — having multiple trades on site at once can reduce overall costs.
How to find a good tradesperson
Always check reviews on Checkatrade, Rated People or MyBuilder. Ask for references from recent similar jobs. Ensure they are appropriately qualified and insured. Never pay the full amount upfront — a deposit of 10–25% is standard.
Frequently asked questions
How much does window replacement cost in the UK?
A standard uPVC casement window costs £300–£600 supply and fit. Aluminium windows cost £500–£1,200 each. Timber sash windows cost £800–£2,000 each. A full house (8–10 windows) typically costs £3,000–£10,000.
Is triple glazing worth it in the UK?
Triple glazing costs 20–30% more than double glazing and reduces heat loss by a further 30–40%. It is most worthwhile in very cold regions or for north-facing windows. For most UK homes, high-quality double glazing offers the best value.
How long do double glazed windows last?
uPVC windows last 20–35 years. Aluminium windows last 30–45 years. Timber windows last 30–60 years with proper maintenance. The sealed unit (glass) typically lasts 15–25 years before the seal fails.
Do I need planning permission to replace windows?
No, replacing like-for-like windows does not require planning permission. Listed buildings and conservation areas may have restrictions on window style and materials.
What is the most energy-efficient window frame material?
Thermally broken aluminium and high-quality uPVC offer similar energy performance. Timber is naturally insulating but requires more maintenance. Look for windows with a BFRC energy rating of A or above.