Start with a condition survey, rather than deciding from the age or appearance of the window. Local repairs may be suitable when most of the joinery is sound; extensive failure may justify replacement of a sash, a case component or the complete window.
What is the difference between repair and restoration?
A repair addresses a defined fault, such as a damaged sill section or failed cord. Restoration usually brings several tasks together to improve the condition and operation of the window. Neither term describes a fixed package, so ask what the quotation includes. Painting, glazing, draught seals and repairs to surrounding finishes should each be identified.
Do you need to replace the whole window?
Ask the surveyor to separate the condition of the moving sashes from the fixed case. A defective lower sash does not by itself establish that the whole case must be removed. Equally, a fresh coat of paint does not demonstrate that concealed joints are sound. Photographs of the defects and an explanation of the proposed intervention make the recommendation easier to assess.
Historic Environment Scotland advises retaining and repairing original timber where possible. Its repair guidance is a useful starting point, but the extent of work still depends on the individual window.
Questions to put to a window specialist
- Which components are sound enough to retain?
- Where does the damage end, and what is causing it?
- Could a local timber repair or a replacement sash solve the problem?
- What would be lost if the complete window were removed?
- How will the proposed work affect the glass, mouldings and shutters?
- What maintenance will the repaired or new window need?
How should you compare the costs?
Compare quotations for the same outcome. A basic mechanical repair cannot be compared fairly with a new, fully finished window. Ask for essential repairs, optional thermal improvements and decoration to be priced separately. Include access equipment, making good and any applicable VAT. If hidden damage could change the price, agree how additional work will be documented and authorised.
What if the building is listed?
Check the proposal with your local planning authority before commissioning changes that could affect a listed building’s character. Repair, replacement and glazing alterations can raise different questions. Do not assume that a product described as “heritage” has permission for your property. See HES guidance on consents.
Related advice and services
- Sash and case window repairs
- Window restoration
- Replacement timber sash windows
- Existing repair cost guide
Back to all sash window resources
Discuss your windows
For a property in Stirling or Central Scotland, contact The Sash and Case Window Company with photographs and a description of the problem. An inspection can establish which work is appropriate for your windows.