A sticking, rattling or draughty sash window does not automatically need replacement. A careful inspection can distinguish repairable defects from widespread structural deterioration.
When repair is often practical
Broken sash cords, failed putty, worn beads, localised timber decay and poor adjustment can often be addressed individually. Repair can preserve the original proportions and reduce the disruption of full replacement.
Signs that more extensive work may be needed
Extensive decay across several structural members, major distortion or repeated water penetration may call for substantial reconstruction or replacement. The condition of the concealed case and sill matters as much as the visible sash.
Comparing whole-life costs
Compare the scope and expected lifespan of each option rather than only the initial price. A quote should explain timber repairs, glazing, ironmongery, painting, disposal and any making-good. Also consider whether a replacement accurately reproduces historic profiles.
Questions to ask a specialist
Ask which parts can be retained, how moisture entry will be addressed, what timber and finishes are proposed, and whether permissions may be required. Photographs of comparable repairs can help you assess workmanship.