As well as offering full sash window and casement window replacement, we can also fit new single or double glazed sashes/casements to the existing window frames, if the frames are in good enough condition to be saved.

As specialists in bespoke timber windows for period, listed and conservation properties, we can carefully match your existing sashes/casements down to the finest detail, with slimline double glazing from just 11mm thick. 

Draught-proofing and new double glazed sashes can reduce heat loss by at least 77% when compared to single glazing. We offer a range of specialist glazing options including acoustic glass, laminated security glass and restoration glass for the authentic heritage look.

Draught proofing and part replacement is the ideal option to improve performance as well as preserve as much of the original architecture as possible. It is the most cost-effective option with minimum disruption to your property. 


  • Reduce heat loss and unwanted noise
  • Eliminate draughts
  • Ensure smooth running window mechanisms
  • Improve energy efficiency
  • Reduce dirt build-up
  • Upgrade security
  • Retain the original look and character of your period property

All our timber sash windows and casement windows are handmade to order in our London factory. To speak to one of our experts about the options available, or to get a quote or arrange a visit to our showroom, please get in touch

With Timbawood sash windows you can always expect:

  • Choice of the finest stable timbers including Accoya, Sapele and Oak
  • Specialist glazing options including acoustic glass, laminated security glass, patterned glass and slimline double glazing that looks just like single glazing
  • Choice of profiles, horns and mouldings to match your existing windows
  • High quality hardware– High security fasteners, locks and restrictors 
  • Full factory spray finish with high performance microporous paint
  • Full perimeter draught proofing
  • Full design, supply and install service

We can also reglaze or replace windows with our thermally efficient single glazing, ‘Solo‘, which is 38% more effective at thermal insulation than single glazing.