🏡 How Much Does It Cost to Install a VELUX Roof Window in the UK? (2026 Guide)
- Feb 28
- 2 min read
If you're thinking about installing a roof window, one of the first questions you’ll ask is:
At Certified Installers, we install genuine VELUX roof windows across the UK, and pricing can vary depending on several factors. This guide explains what affects the cost and what you should realistically budget for in 2026.
💷 Average Cost of Installing a VELUX Roof Window
In the UK, the average supply and installation cost typically ranges between:
£900 – £2,500 per window
This depends on:
Window size
Type of glazing
Roof access
Internal finishing work required
🔍 What Affects the Price?
1️⃣ Size of the Window
Larger windows cost more to purchase and require more structural adjustment.
2️⃣ Type of Window
Centre-pivot windows are generally the most affordable
Top-hung windows cost slightly more
Electric or solar-powered models increase the price further
3️⃣ Flashing Kit & Roof Type
Your installer will use a compatible flashing kit depending on whether your roof is:
Tile
Slate
Metal
Correct flashing is essential for waterproofing and long-term performance.
4️⃣ Internal Finishing
If plastering or making good internally is required, this will add to the overall cost.
⚡ Is It Worth the Investment?
A professionally installed VELUX window can:
✔ Increase natural light by up to 3x more than vertical windows✔ Improve ventilation✔ Boost property appeal✔ Increase perceived room size
Many homeowners find it’s one of the most cost-effective upgrades compared to a full extension.
🛠 Why Professional Installation Matters
Incorrect installation can lead to:
Leaks
Heat loss
Condensation issues
Working with experienced installers ensures:
Proper insulation
Correct flashing
Warranty compliance
📞 Thinking About Installing a Roof Window?
If you're considering adding more natural light to your home, our team at Certified Installers can provide expert advice and a clear, fixed quotation.
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