Sash Window Restoration

  • Sash Window Restoration
  • Sash Windows Repair & Restoration
  • Wooden Window Repair & Restoration


Window restoration

Window Restoration is a process that involves renovation and refurbishment combined with draught proofing and the complete overhaul of your box sash windows. The restoration also involves repairing all mechanical faults and repairing all rot and decay using highly specialised restorative joinery techniques. During the sash window restoration process all paint is either sanded or removed from both the box frames and the sliding sash windows and then after all repairs are completed the sash windows and boxes are completely redecorated to the highest standard possible.

Our wooden sash window restoration work is mainly carried out on the project site however if required the sash windows will be removed and restored at our workshop. We advise our customers that restoring can be labour-intensive, particularly if the sash windows are in a state of disrepair. Sometimes having newly-made sashes and retaining the box frame is a more cost-effective option.

We restore sash windows on listed buildings and on some conservation area buildings – where the local authority or client have requested the sash windows be restored rather than replaced.

After our window restoration work is complete your windows will be ready for redecoration. The windows are finished to the highest of standards by our trained team of professionals using only the best quality materials on the market.

Window restoration process :

  • Window units are carefully removed from the window frame.
  • Any decaying timber in the units, frame or cill is moved around to show the “sound” timber.
  • Occasionally, new reclaimed timber is joined together or replaced where the existing timber is impossible to repair.
  • Our unique resin is used to fill the cavities and is moulded to fit in with the existing shape of the timber.
  • Sash cords are replaced, pulleys are checked and the weights correctly balanced to ensure that the windows work very smoothly.
  • Windows and box are decorated for a complete process

English Heritage favours restoration over replacement because it preserves the very high quality old timbers, beautiful old glass, and retains the look and feel of an old property which is often detracted from even when replacing with new wood windows.


You should aim to inspect your sash windows every year (and, ideally, get a qualified professional to inspect the whole house every four or five years).

Typical old sash window problems likely to be encountered include:

  • Cracked and flaking paintwork: the outside of the windows should be repainted at intervals of five to eight years, normally.
  • Sticking windows: usually the result of either careless replacement of staff bead, following repair or re-cording, which is easily remedied, or a build up of paint which needs to be removed.
  • Failed putty and broken glass panes: these are relatively easy to replace.
  • Broken cords: in former times people re-corded their own windows – the cords and sash weights were available at any ironmongers (and still are at some).
  • Timber decay, particularly to the bottom rail: fillers are invaluable for minor decay and surface imperfections where the strength of the timber is unaffected; loose corner joints can be strengthened by means of corner brackets which can then be painted over, and more significant repairs can be carried out by any competent joiner.