Timber Sash Windows

Yes. Slim-profile double glazed units from 11mm fit into a properly made sash without the sightlines going heavy. They weigh more, so the counterweights are recalculated and the cords upgraded.

In a conservation area, replacing windows usually needs permission and the replacement must match the original. In a listed building you will need listed building consent. We can supply drawings and a specification to support an application.

Cords and weights for a traditional box sash — they are repairable indefinitely and feel right. Spiral balances suit a slimmer box and are the only option where there is no weight pocket, but they wear out and need replacing.

A new sash with brush seals in the meeting rail, staff bead and parting bead is not draughty at all. The draught in an old sash comes from a worn rebate, not from the design.

Accoya as standard for painted sashes — it is dimensionally very stable, which matters in a component that has to slide. European redwood is available at lower cost with a shorter finish life.

Yes. We match the bar width and profile from the original. With double glazing, a true divided bar with individual small units is the authentic route; a bonded bar with a spacer inside is far cheaper and reads correctly from the street.

No. The brush seals take up the clearance the sashes need to slide, so they are quiet in wind while still moving freely.

Very often, yes — see our sash window restoration service. If the boxes are sound and only the sills and bottom rails have gone, repair is usually the better value and keeps the original glass.