Scores based on 208 reviews

Reliability & timekeeping

Invoice history based on 190 reviews.

Invoice History
Charged as per quote / estimate90%
Above quote / estimate: kept informed10%
Appointments reported as missed (6 months) 0
Average score 9.90
208 reviews
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Restore your sash windows - discover a warmer, quieter and more secure home

  • 10 years’ experience
  • highly skilled craftsmen
  • exceptional level of service 
  • competitively priced
  • best quality materials
  • extreme care in your home

SashWise is a family run business based in Twickenham and specialises in the repair, restoration and replacement of wooden sash windows.   Dan (the owner), and his team of highly skilled craftsmen are passionate about delivering a high level of service at a competitive price.  We only use the best quality materials and take extreme care in our clients’ homes. We work in Teddington, Twickenham, Richmond, Hampton, Kew, Barnes, Kingston and all surrounding areas.

Free site survey and competitive quotation
We pride ourselves on ensuring we exceed our clients’ expectations.   We provide a free site survey and a quotation which is tailored to your individual needs. 
Servicing and draft proofing – save heat, eliminate drafts and improve sound-proofing
Through the use of our specialist draught-proofing system we will get your sash windows opening and closing smoothly again and eliminate draughts & rattles.  Sash cords are replaced with high quality waxed cotton cord and the windows re-weighted and re-balanced.  Any rot is repaired on site.
Full restoration – restoring the integral beauty of your period home
Wooden sash windows are central to the architectural heritage of any period home.  Our team of craftsmen are passionate about returning these historic features to their original beauty through the full restoration service we offer.   At our local workshop, the sashes are taken back to wood and all rot is repaired.  The windows are then fully serviced (as detailed above) and painted throughout using a special high quality micro-porous paint on the exterior and an eggshell finish on the interior.
The boxes are prepared, sanded, primed and an undercoat applied.  The sills are also finished with a gloss and eggshell coat.
Double glazed hardwood sashesretain heat and reduce noise levels
If you are looking to improve the thermal performance of your sash windows and reduce noise pollution then we can make double-glazed hardwood timber sashes to fit within your original box sash frame. This is a more cost effective and less disruptive process than replacing the whole of your sash window. 
If you are looking to re-instate timber sash windows, if you need a new window in an extension or if your current sash boxes need replacing and they are beyond repair, we can also supply and fit new hardwood sash boxes complete with double glazed sashes that replicate the originals.
We take great care to replicate the style and detail of your existing sashes so that they maintain the traditional character of your property. 
We work throughout the boroughs of Richmond, Twickenham, Kingston, Chiswick, Ealing, Wandsworth and all neighbouring areas.

Please call us today on 0208 977 4627 to discuss your individual requirements.

Plantation shutters

We also design and install plantation shutters - please see our sister company - Shutterwise for more information:

Based in

Twickenham, Middlesex

Works in

Barnes, Chiswick, Ealing, Kew, Kingston and all surrounding areas., Richmond, Teddington, Twickenham, Wimbledon

Team photos

Our restoration process

Fully restoring original timber sash windows in our workshop in Twickenham

New double glazed sashes - Kingston

Our senior fitter installing stunning new arched double glazed sashes

Team vans

Sashwise vans on the job