Sash window replacement quotes

Sash windows slide vertically rather than swinging open, and they define the character of Victorian, Georgian and Edwardian homes across the country. The trouble is that original single-glazed timber sashes rattle, stick and let heat pour out. A replacement sash gives you the same slender lines and glazing bars but with a modern, insulated sealed unit and smooth, spring-balanced operation.

Why sash quotes differ from casements

A sliding sash is more involved to manufacture than a hinged casement. It has two moving sashes, a balance mechanism to hold them open, deeper box or slimline frames, and often decorative glazing bars or a run-through horn to match the original. All of that means a sash replacement typically sits above an equivalent casement on price. The trade-off is a window that keeps your home looking right and, in conservation areas, keeps you on the correct side of local rules.

You can choose slim uPVC sashes, timber-alternative composites or genuine engineered timber. Each carries a different cost, and the finish you pick — woodgrain foil, painted colour, astragal bars — moves the number. A good quote lists these choices so you can see where the money goes.

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Repair, restore or replace?

Not every tired sash needs replacing. If the timber boxes are sound and only the glass or cords have failed, refurbishment or a new sealed unit may be enough. If the frames are rotten or the draughts are chronic, full replacement is usually the better long-term value. Weighing it up? This guide on repair or replace — how to decide is a level-headed place to start, and our own page on replace the glass or the whole window? covers the glass-only option in detail.

Measuring and matching

Getting a sash quote right depends on careful measuring, because period openings are rarely square and the sight lines must match neighbouring windows. A surveyor records the opening at several points, the depth of the reveal and the profile of the existing sashes. Our guide on how replacement windows are measured explains why brick-to-brick differs from the old frame. To match the streetscape it also helps to compare window styles to replace like-for-like before you decide on bar layout and horns.

Getting an accurate sash quote

Prices vary widely by material, size and region, so treat any single figure as a guide rather than a promise. To compare like with like you can get a fast quote direct, no showroom, or browse the current double glazing deals and prices. 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 no-obligation.

Comparing styles? See our guides to casement window replacement and bay window replacement, or return to the quotes by window type hub.