Window installation & fitting cost

When you read a window quote, roughly half the figure is the window itself and the rest is fitting — labour, access, making good and disposal. Understanding the window fitting cost helps you see why two quotes for the same window can differ, and where a low headline price might be cutting corners.

What the fitting cost covers

• Removal: taking out the old frame and glass carefully, without damaging the surround.
• Installation: fitting, levelling, sealing and securing the new window.
• Making good: plaster, render or brickwork repairs and internal finishing.
• Access: scaffolding or towers for upper-floor windows.
• Disposal: removing and recycling the old units and waste.
• Certification: registering the work under a scheme such as FENSA or CERTASS.

As a rough guide, fitting labour alone commonly works out at around £150–£300 per window on a straightforward job, with access and making good added on top where needed.

Why fitting costs vary

Ground-floor windows with easy access are the cheapest to fit. Upper floors that need scaffolding, awkward or restricted access, and windows that need structural head support or extensive making good all raise the labour share. Certification and a proper guarantee are part of a good quote, not an optional extra — work registered with a competent-person scheme keeps you on the right side of building regulations.

The window and the fitting are two halves of the same number, so read them together. Our cost per window guide covers the supply side, and what changes your window cost pulls both together.

Keep exploring the cost guide

• Back to the window cost guide
• What changes your window cost
• Whole-house window cost