Upgrading your home with new double-glazed windows can improve energy efficiency, boost security and enhance comfort — but how much should you expect to pay? In this guide, we break down current UK double-glazing costs so you can plan your budget with confidence.
Typical Double Glazing Costs in 2026
Prices for double-glazed windows vary significantly depending on the window style and materials you choose. Below is a summary of average costs:
| Window Type | Average Cost per Window |
|---|---|
| Casement windows | £500 – £1,250 (≈ £1,000 average) |
| Sash windows | £700 – £1,500 (≈ £1,200 average) |
| Sliding windows | £600 – £1,400 (≈ £1,100 average) |
| Tilt and turn windows | £600 – £1,400 (≈ £1,100 average) |
| Bay windows | £1,100 – £4,000 (≈ £2,500 average) |
| Bow windows | £1,500 – £5,000+ (≈ £3,000 average) |
These figures are ballpark averages and can vary based on frame material, glazing upgrades and installation specifics.
What Affects Double Glazing Prices?
Several key factors influence what you’ll pay:
1. Number of Windows
Naturally, more windows mean higher total costs. Typical UK homes with 8–12 windows see total double-glazing costs of roughly £8,000 – £15,000 for the complete project.
2. Frame Material & Style
Frames made from different materials (uPVC, timber, aluminium) vary in price:
uPVC is often the most cost-effective choice.
Timber and aluminium alternatives tend to cost more due to materials and fabrication.
At Doors Windows Stairs, you can explore a wide range of high-quality uPVC, timber and aluminium windows that suit various budgets and design preferences.
3. Glazing Options
Standard double glazing provides good insulation, but you can also upgrade to different glass types for greater thermal performance or noise reduction — these enhancements will affect cost.
Calculating Your Project Cost
To estimate the total cost for your home:
Choose your window types and quantities — for example, casement for bedrooms and larger bow windows for lounge spaces.
Add typical unit prices (see the table above).
Include installation and any extras like bespoke glazing or coloured frames.
You might also factor in contingency funds (around 10–15%) for unexpected costs during installation.
Labour & Professional Installation
A double-glazing installation isn’t a DIY job — it’s best carried out by experienced tradespeople. Professional fitters ensure your new windows are properly sealed, weather-tight, compliant with building regulations and meeting warranty requirements.
Why Invest in Quality Windows?
Investing in well-installed double glazing is about more than just upfront costs:
Reduced heat loss helps lower heating bills.
Improved security comes from modern frame designs and locking mechanisms.
Better comfort with less draughts and noise.
Upgraded home value if you put your property on the market.
At Doors Windows Stairs, every window in the range is designed with performance and durability in mind, giving you options that balance cost and long-term value.
© 2026 Doors Windows Stairs | Website by Simplicity Marketing
