Endorsed by Which?

The Sash Window Workshop Trading Ltd

4.9

38 Reviews

Opening Hours
Today -
  • Monday 08:00–16:30
  • Tuesday 08:00–16:30
  • Wednesday 08:00–16:30
  • Thursday 08:00–16:30
  • Friday 08:00–16:00
  • Saturday - Closed
  • Sunday - Closed

Why you can trust this trader

After undergoing rigorous assessment to become endorsed, every Which? Trusted Trader agrees to our Code of Conduct. This gives consumers the reassurance that they have the best possible protection and adds an extra layer of security to ensure best practices and procedures are followed. Which? fully investigates any breaches and will take any necessary action to ensure consumer protection.

Organisations and Awards

MARCH 2023
NOVEMBER 2021

About

The Sash Window Workshop specialises in the manufacture and installation of traditional timber windows and doors across London and the South of England. We also provide a nationwide supply-only service.

Our bespoke sash windows, casement windows and external timber doors are handcrafted in our Berkshire workshops to combine period charm with modern energy efficiency. Where possible, we can replace only the moving parts of your existing windows if the frames are still in good condition.

In addition, we offer bespoke secondary glazing and a draught proofing service for timber windows.

With a commitment to craftsmanship, sustainability and exceptional customer care, we aim to deliver excellence on every project. Around half of our orders come from returning customers and recommendations — a testament to the quality of our products and service.

For a free, no-obligation site survey and quotation, please contact us on 01344 868 668.

What we do

  • Doors

    • Timber doors
    • Patio doors
    • Bi-fold doors
    • French doors
    • Front door
  • Glaziers

    • Window consultants
    • Sash windows
    • Timber windows
    • Replacement window services and repairs
    • Double glazing installation
  • Draughtproofing installers

  • Double glazing

  • More Services

    • casement windows
    • featured windows

Customer reviews

Why you can trust these reviews

All reviews are verified as being genuine and a true customer of this trader.

How can we be so sure?

100% of the reviews we publish have been through our stringent moderation process.

4.9
38 reviews
Customer Service
5.0
Quality
5.0
Value
4.8
Sort by
Beautiful doors and excellent service
Customer Service
Quality
Value
Sash Window Workshop recently installed four replacement French doors and a replacement casement window in our home. The window was a relatively routine assignment, but the doors were more challenging, because they are very large and have an unusual (and very beautiful) curved shape. We had very specific requirements for the doors, as to shape, double-glazing, glazing bars, locking mechanism, and materials. Before choosing Sash Windows, we shopped for months and visited the showrooms of multiple suppliers, none of whom was able to deliver bespoke doors that would meet our requirements. Finally, we found that Sash Windows would produce exactly what we wanted. They were meticulous in ensuring that what they were going to build was in line with our requirements, and would fit the pre-existing openings for the doors. The installers were efficient, polite, punctual, and competent in every way. We wholeheartedly recommend Sash Windows for door and window installations.
Customer in Greater London Posted on 27/08/2026 , work completed 19/08/2026
The trader replied (on 09/09/2026)
Thank you for taking the time to leave us a review on our Which? Trusted Traders profile and for recommending us. I am delighted to hear that you are happy with your bespoke new doors and casement window, along with the service that you received from our installers. I will pass your feedback on to everyone who worked on your job. Thank you for trusting us with your business. Best wishes, Richard Dollar, Managing Director, The Sash Window Workshop
Quality product and service. Would use again
Customer Service
Quality
Value
From start to finish, dealing with The Sash Window Company was smooth and effortless. The initial meeting, the survey, and then installation were carried out by people who could communicate well and everything happened when they said it would. Our new patio doors were installed professionally and are absolutely perfect. We couldn’t be more pleased with this quality product. The installer took time to talk to us on any decision points and no mess was left on their departure. Would highly recommend.
Customer in Surrey Posted on 26/08/2026 , work completed 13/08/2026
The trader replied (on 09/09/2026)
Thank you for your review of the work that we carried out for you. I am delighted to hear that you are happy with the quality of your new doors and with the customer service. I would like to take this opportunity to thank you for trusting us with your business. Best wishes, Richard Dollar, Managing Director, The Sash Window Workshop
Replacement double glazed sash windows
Customer Service
Quality
Value
The Sash Window Workshop replaced windows in our 130 year old house. Their windows look wonderful, open easily and the fitters completed the work quickly efficiently and tidily
Customer in Surrey Posted on 20/07/2026 , work completed 17/07/2026
The trader replied (on 21/07/2026)
Thank you for your 5* review on our Which? Trusted Trader profile. I am delighted to hear that you are happy with the service provided by our team. I will pass your feedback on to all involved and look forward to working with you again in the future. I would also like to take this opportunity to thank you for trusting us with your business. Best wishes, Managing Director, The Sash Window Workshop
What a brilliant customer experience!
Customer Service
Quality
Value
What a brilliant customer experience, from start to finish! We had been considering switching to double glazed Sash windows for over 7 years and how happy are we that we waited and found The Sash Window Workshop! From the initial quoting process with Ronan, which was super detailed and responsive, to all the support from Daniel in the technical details and reviews needed for us to gain the necessary approvals with our managing agent (which wasn't an easy process!). We were surprised to have such quick turnaround for the manufacturing, with 1 month only lead time for our installation window. Elizabeth and Vera were super quick in the planning and communications and Beau was always available and patient to clarify all my queries about the paint colours. When it came to the installation date, another great surprise with the utmost professionalism from the team. Paul, Paulo and Martin were the main leads and everything worked so efficiently, the flat was always left tidy at the end of the day and care and attention was taken with the building regulations around quiet time and access. We could not believe that 15 Sash windows could be installed in just 3 days and they were! It honestly felt like magic and the windows look beautiful. A true demonstration of professionalism and what can be achieved when a team of experts works well together! Thank you Ronan, Daniel, Elizabeth, Vera, Beau, Paul, Paulo and Martin!
Customer in Greater London Posted on 25/06/2026 , work completed 24/06/2026
The trader replied (on 26/06/2026)
Thank you for your 5* review on our Which? Trusted Trader profile. I am delighted to hear that you are happy with the service provided by our team. I will pass your feedback on to all involved and look forward to working with you again in the future. I would also like to take this opportunity to thank you for trusting us with your business. Best wishes, Managing Director The Sash Window Workshop
Fantastic Windows
Customer Service
Quality
Value
Excellent experience from start to finish. Great service from the survey team up front, were open about the costs and benefits that new windows would bring. Smooth ordering and payment service. On the day the fitter was professional and personable. Did an excellent job of removing and installing new windows. The windows themselves are excellent. Great quality, and proper ventillation mean no more condensation. And its like someone put the outside world on mute! We will be coming back for more windows in the future.
Customer in Greater London Posted on 05/06/2026 , work completed 03/02/2026
The trader replied (on 08/06/2026)
Thank you for your review of the work that we carried out for you. I would like to take this opportunity to thank you for trusting us with your business. I am delighted to hear that you are so happy with your new sash windows and with the service that you received. I hope your windows continue to serve you well. Best wishes, Richard, Managing Director, The Sash Window Workshop
Very professional workmanship and attitude
Customer Service
Quality
Value
We had two new windows installed at the top of our house. The whole process from first call out for a quote and survey to the installation was handled very professionally. We were kept informed at all times of the progress of the order and the team who came were courteous, skilled and completed the job within the specified timeframe. They explained the installation process at every stop and cleaned up after the job was done. We highly recommend the company.
Customer in Greater London Posted on 14/04/2026 , work completed 10/04/2026
The trader replied (on 08/06/2026)
Thank you for your review of the work that we carried out for you. I would like to take this opportunity to thank you for trusting us with your business. I am delighted to hear that you are so happy with your new sash windows and with the service that you received. I hope your windows continue to serve you well. Best wishes, Richard, Managing Director, The Sash Window Workshop
Simply the best.
Customer Service
Quality
Value
It's been a total pleasure to work with this company. I needed a new front door and from beginning to end everything ran smoothly, schedule and budget on time and price never changed. After my door was fitted the guys tidied up the location and left it even better than they found it. Everyone involved were totally professional and just genuinely very nice people! I absolutely love my new front door,(a very big thank you to you all), and I would have no hesitation in recommending this company. My family and friends all know about it. Am now saving up to get my windows done!
Customer in Greater London Posted on 09/04/2026 , work completed 18/03/2026
The trader replied (on 10/04/2026)
Thank you for taking the time to leave us a review. I am delighted to hear that you are happy with the service provided. I will pass your feedback on to all involved. I would also like to take this opportunity to thank you for trusting us with your business. Best wishes, Managing Director The Sash Window Workshop
Brand New Sash Windows! Great Service, Professional and High Quality Workmanship!
Customer Service
Quality
Value
The Sash Window Workshop replaced all 11 sash windows in our house with brand new double-glazed accoya wood units. The whole process was smooth, efficient and professional and we are very happy with our new windows! The whole project was completed on budget and on time and the fitting team were diligent, clean and looked after our house as best at they could given the intrusive nature of the work. All in all, very happy customers!
Customer in Greater London Posted on 19/05/2025 , work completed 16/05/2025
The trader replied (on 20/05/2025)
Thank you for your review of the work that we carried out for you. I would like to take this opportunity to thank you for trusting us with your business. I am delighted to hear that you are so happy with your new sash windows and with the service that you received. I hope your windows continue to serve you well. Best wishes, Richard, Managing Director, The Sash Window Workshop
New Yorkshire Sash Window
Customer Service
Quality
Value
I was delighted with the service I received from the Sash Window Workshop. To be honest, I was a bit apprehensive about having my old window removed and a new one installed. I imagined all sorts of things that could go wrong but in fact it couldn't have gone more smoothly. A few weeks before the installation, one of the experts came to measure the window exactly. On the day itself, Steve inserted the window with no problems even though he had to carry the new window and all his tools up a narrow, winding staircase. He arrived on time, covered the furniture and carpets with clean dust sheets, and did an excellent job of fitting the new window. I was very relieved that it went so smoothly - and the new window looks very smart. I would certainly recommend the Sash Window Workshop.
Customer in Greater London Posted on 03/04/2025 , work completed 20/03/2025
The trader replied (on 04/04/2025)
Thank you for for taking the time to leave a review on our Which? Trusted Traders profile. I am delighted to hear that everything went smoothly and that you were so happy with the service and work carried out by Steve. I will make sure that your feedback is passed onto him. I am also glad to hear that you are happy with your new window and that you would recommend us to others. Thank you for trusting us with your business. Best wishes, Richard, Managing Director, The Sash Window Workshop
Quality and professional new front sashes
Customer Service
Quality
Value
We had the front sashes of our double-fronted house redone, replacing the old single glazing. The service was professional from start to finish. Communication was clear at every step, from the quote to the final installation. The team worked exactly on schedule with minimal disruption. The quality of the work was excellent, down to the smallest finishing touches and cleanup. No surprises just a smooth, well-executed job. We would recommend them without hesitation and wouldn’t hesitate to use them again in the future!
Customer in Greater London Posted on 11/03/2025 , work completed 04/03/2025
The trader replied (on 13/03/2025)
Thank you for your review of the new sashes that we manufactured and installed for you and for trusting us with your business. I am delighted to hear that the quality was excellent and that you would recommend us without hesitation. I will pass your feedback on to all involved. Best wishes, Richard, Managing Director, The Sash Window Workshop.