Soft timber, open joints, peeling paint and recurring damp around a sash window can indicate localised decay. Early assessment matters because moisture can spread beyond the visible surface, particularly around sills, lower rails and glazing details.
Have you found damaged timber? Request a free initial assessment or email photographs and details to hello@sashandcaserepairsedinburgh.co.uk.
Common signs of sash window timber decay
- Timber feels soft, flakes away or can be marked easily.
- Paint repeatedly blisters or peels in the same location.
- Joints have opened around the sill, lower rail or glazing bars.
- Putty is cracked or missing and water is reaching the timber below.
- Dark staining remains after surrounding surfaces have dried.
- The sash no longer closes evenly because a section has distorted.
Why sash windows develop rot
Edinburgh’s wind-driven rain can expose weak points in external paint, putty and joints. Decay is more likely where water cannot drain or where previous coatings have trapped moisture. A lasting repair therefore needs to address the moisture route as well as the visibly damaged wood.
Can the original window be retained?
Localised decay does not automatically mean the whole window must be replaced. Sound surrounding timber may allow a damaged section to be cut back and repaired or spliced. The appropriate approach depends on how far the decay extends, whether joints remain structurally sound and whether the window is listed or within a conservation area.
What a proper assessment should cover
- Extent: identify all affected timber rather than treating only the painted surface.
- Moisture source: inspect putty, paint failure, joints, drainage and adjacent masonry.
- Repair boundary: determine whether a local repair is appropriate or a larger section needs attention.
- Finishing: protect repaired timber and reinstate glazing or paint details needed to keep water out.
Indicative timber repair costs
A localised timber splice is shown in our current Edinburgh planning guide at approximately £200–£600. More extensive restoration can cost more, particularly where several components or windows are affected. Access, decoration and glazing requirements also influence the quotation.
Review the full sash window repair cost guide for comparable repair ranges.
Listed and conservation-area properties
Repairing original fabric is often preferable to unnecessary replacement, but the property and proposed work should be considered individually. See the listed-building sash window repair guide for the questions to raise before work begins.
What to send with your enquiry
Include the Edinburgh area or postcode, the number of affected windows, close-up photographs of the damaged section, and a wider photograph showing the full window. Mention persistent condensation, leaking gutters, damaged stonework or failed putty where relevant.