How to Repair a Sash Window

Timber sashes are feats of great engineering. When they stick or crash shut, a sash window repair can restore smooth travel and reduce draughts. Prepare a clear workspace, lay dust sheets, label beads and fixings, and support both sashes so panes stay safe while you work. Below are some steps on how to repair a sash window.

Diagnose the Fault

Confirm what has failed – snapped cords, seized pulleys, or worn beads. Lift each sash gently, resistance on one side points to a broken cord behind the pocket. Spin the pulleys, note missing draught strips, and order sash cord and brads before opening.

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Open up Safely

Score paint lines, then prise off inner staff beads from the centre to reduce splitting. Lift out the lower sash and tie any surviving cord to prevent the weight dropping. Remove the pocket pieces and recover both weights. Free and oil the pulleys, and replace both cords with secure knots, leaving tails for hanging.

Rehang, Seal and Finish

Offer up the lower sash, pin cords into their grooves, and check balance before refitting beads. Ease out the parting bead to service the upper sash, then reseat it snugly. Add brush seals, square the catches, and prime bare timber, then apply two topcoats.

Work methodically and avoid forcing joints. If frames are badly distorted or there is decay, pause for a survey. A thorough sash window repair preserves character while delivering a window that slides, seals, and lasts.