SashWise Limited
Sash-window restoration and replacement in West London
About SashWise Limited
SashWise restores, repairs and replaces timber sash and casement windows across West London. It also supplies and fits hardwood windows and doors, offers double-glazing upgrades and provides draught proofing, rot repair and restoration. The family-run business was founded by Dan Johnston in 2006; Dan leads its day-to-day running and still works on site.
The team surveys homes and manages work through installation, matching replacement windows to period details where needed. Its service covers everything from broken cords and pulleys to full window replacement, and it can repair rot in frames, sills and sash boxes. The company has a local joinery workshop in Twickenham and says it takes care to protect customers’ homes during work.
SashWise offers an insurance-backed guarantee: new joinery and sealed units are covered for 10 years, and paintwork for two years. The company says its team has over 25 years of combined experience and plants a tree with every order.
Areas covered
- Barnes
- Chiswick
- Ealing
- Hammersmith
- Hampton
- Kew
- Kingston
- Putney
- Richmond
- Sunbury
- Surbiton
- Teddington
Services
Windows and doors
- Timber sash windows
- Timber casement windows
- Aluminium windows
- Single and French doors
- New hardwood sash boxes
Repairs and restoration
- Sash window restoration
- Rot repair
- Draught proofing
- Window sill replacement
- Security upgrades
- Glazing options
What their website says about each service
- Bespoke Windows & Doors
“we offer custom-made timber window replacements that replicate the design and craftsmanship of your originals”
- Door Fitting
“We also supply and fit a wide range of doors to complement our sash and casement windows, including French doors and front and back doors.”
- Window Installation & Double Glazing
“We offer a range of double-glazing solutions to improve insulation without compromising the historical look of your property including the innovative new Fineo vacuum glazing.”
- Window Repair
“From basic repairs to full replacement, we specialise in returning your windows to their original beauty while enhancing their functionality and energy efficiency.”
What customers say
From start to finish SashWise have been proactive and professional. Great communication with Dan and Melissa before installation. We are absolutely delighted with the windows that are now installed.
Shared on sashwise.co.uk.