Casement window replacement quotes

Casement windows are hinged on the frame and open outwards on a stay, either from the side or from the top as a top-hung vent. They are the most common replacement style in Britain because they suit almost any home, seal tightly against draughts and are relatively economical to manufacture. If you are swapping tired timber or first-generation uPVC, a casement is usually the most cost-effective route to a warmer, quieter room.

What drives a casement quote

The headline figure comes down to size, the number of opening sashes and the glass. A large picture-style casement with a single top vent is cheaper per square metre than the same opening split into several openers, because each openable sash adds hinges, a handle, extra seals and a little more labour. Frame colour matters too: white uPVC is the standard, while woodgrain foils, anthracite grey and dual-colour frames carry a premium. Finally the glazing — standard A-rated units, acoustic glass for a busy road, or toughened safety glass where the sill sits low — each nudges the price.

A tidy quote itemises all of this so you can see what you are paying for rather than a lump sum. If any line is vague, ask for it to be broken down before you compare against another installer.

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Like-for-like or an upgrade?

Most casement replacements are a like-for-like swap: the same layout, the same opening pattern, just a modern frame and warm-edge sealed unit. That keeps the price down and the survey simple. But a replacement is also your chance to rethink the room — adding a top vent for ventilation, moving to slimmer sightlines for more glass, or upgrading to a higher energy rating. If you want the outside to match neighbouring properties, it is worth comparing window styles to replace like-for-like so the new units look right from the street.

Measuring and fitting

A surveyor measures the structural opening rather than the old frame, checking the width and height at several points and the sill, because openings are rarely perfectly square. Our guide on how replacement windows are measured walks through what they check and why it protects your price. On fitting day the old unit is removed, the new frame is packed level, fixed and sealed, and the plaster and sill made good.

Getting an accurate casement quote

Prices vary by region and specification, so treat any single number as a starting point rather than a promise. To line up comparable figures you can get a fast quote direct, no showroom, or scan the current double glazing deals and prices for context. Funding and contribution options may be available subject to eligibility and a home survey, and £0-upfront options may be available for those who qualify. The quote and home assessment are free and carry no obligation.

Prefer to explore related styles first? Read our guides to sash window replacement and bay window replacement, or head back to the replacement quotes by window type hub.