VELUX Roof Window Installation Costs & Considerations

How Much Does It Cost to Install a VELUX Roof Window?

Installing a VELUX roof window is one of the most effective ways to brighten a home, increase ventilation and add value to a property. Installation costs can vary based on the size of the window, the roof construction and the complexity of the job.

This guide provides an honest, practical overview of what affects installation costs — helping you budget confidently and choose the right products for your project.

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Typical VELUX Installation Cost Range

Based on UK installer averages, a standard VELUX installation usually costs:

• £700 – £1,200 for a single standard roof window (labour only).
• £1,200 – £1,800 for larger or top-hung models.
• £1,500 – £2,500+ for structural changes or multiple windows.

Note: These figures are approximate, based on typical residential installations by professional roofers.

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Key Factors That Affect Installation Costs

The price can vary depending on several important factors:

• Roof type: Tiled and slate roofs are generally straightforward; flat roofs or complex coverings cost more.
• Window size: Larger sizes (e.g. PK06, SK06, UK08) require more labour.
• New opening vs replacement: Replacements are usually cheaper than cutting a new opening.
• Internal finishing: Plasterboard, making good and decorating add to the total cost.
• Access: Difficult or high roofs increase labour time.
• Flashings: The correct flashing (EDW, EDL, EDP) ensures a weather-tight finish.

For help choosing the correct flashing, see our VELUX Flashing & Installation Guide.

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How Long Does a VELUX Installation Take?

• Standard installation: 2–4 hours
• Larger windows: 4–6 hours
• Multiple windows: Full day or longer

Installers typically complete all external work the same day. Internal finishing may take additional time depending on the project.

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New Installation vs Replacement: What's the Difference?

See size compatibility in our VELUX Size & Code Guide.

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Additional Costs to Consider

• Internal plasterboard work / making good
• Blinds (blackout, translucent, solar, pleated)
• Electrical or solar components
• Scaffolding if required
• Warm roof upgrades or insulation

For glazing options that improve energy efficiency, visit our VELUX Glazing Options Guide.

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Signs You Need a New VELUX Window

• Condensation between panes
• Drafts or heat loss
• Leaking around the frame
• Discoloured or swollen pine finish
• Difficulty opening or closing

Older models (pre-2013) often benefit from upgrading to modern white-painted, energy-efficient versions.

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Should I Hire a Professional Installer?

While some competent DIYers can handle a VELUX installation, most customers choose a qualified roofer for peace of mind, better guarantees and a weather-tight finish.

• Correct integration with membranes
• Proper flashing sequence and sealing
• Accurate squaring and levelling of the frame
• Correct insulation and vapour control

VELUX installation accessories such as insulation collars can significantly improve performance and reduce heat loss.

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