Roof Windows Installation in London (23)

Roof windows allow natural light and fresh air into lofts and upper-floor rooms, helping turn darker spaces into brighter, more usable areas. Installing a roof window is a popular option during loft conversions, home improvements, or when upgrading older roof glazing.

If you’re planning work on your roof, finding the right roof window installers in London helps ensure the window is fitted securely, sealed correctly, and performs well over time.

What roof windows installation involves

Roof windows installation involves creating or using an opening within a pitched roof and fitting a window designed to sit flush with the roofline. The process includes structural checks, careful cutting of the roof covering, fitting the window and flashing, and sealing the surrounding area to prevent leaks.

Installers also ensure insulation is properly installed around the frame, helping reduce heat loss and condensation.

When you might need roof window installers

Many homeowners consider roof windows if they’re hoping to:

• Convert a loft into a usable living space
• Replace older or damaged roof windows
• Improve natural light in upper rooms
• Upgrade to modern, energy-efficient glazing

Using a specialist installer helps reduce the risk of water ingress, draughts, or poor alignment.

Ready to hire? Check out our guide to finding Velux window installers near you.

How much does roof window installation cost in London?

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Prices can vary depending on the size of the window, roof type, ease of access, and whether a new opening is required or an existing window is being replaced.

New roof window installation vs replacement

New installation

• A new opening is created in the roof
• May involve structural adjustments
• Usually takes longer and costs more

Replacement installation

• Uses an existing roof opening
• Often quicker to complete
• Typically lower labour costs

Knowing which type of work you need helps set expectations for cost and timescales.

What to check before hiring a roof window installer

• Experience with similar roof types
• Knowledge of roof window brands and glazing options
• Clear explanation of weatherproofing and insulation
• Timescales for installation
• What’s included in the quoted price

Comparing a few installers can help ensure the work is carried out correctly.

Want help choosing the right tradesperson? Read our tips for finding the best window installer.