Endorsed by Which?

London Box Sash Windows Ltd

5.0

105 Reviews

Opening Hours
Today -
  • Monday 07:30–17:00
  • Tuesday 07:30–17:00
  • Wednesday 07:30–17:00
  • Thursday 07:30–17:00
  • Friday 07:30–17:00
  • Saturday - Closed
  • Sunday - Closed

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About

London Box Sash Windows is a family-owned and operated business that has been providing London homeowners with high-quality, custom-made timber sash windows for over 40 years. We use only the finest timber and double-glaze our windows to provide excellent insulation and energy efficiency. Our windows are also built to the highest standards and are backed by a comprehensive warranty.

We offer a wide range of timber sash window styles to choose from, including horns to match existing designs, traditional looking double-glazed units, casement windows and french doors

If you are looking for high-quality, custom-made timber box sash windows, then London Box Sash Windows is the perfect choice for you. Contact us today to schedule a free consultation and estimate.

FENSA Registered Company

0208 648 4230

What we do

  • Glaziers

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

    • Double glazing installation
  • Carpenters

    • Joinery and carpentry
  • More Services

    • double-glazed timber sash windows

Customer reviews

Why you can trust these reviews

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How can we be so sure?

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

5.0
105 reviews
Customer Service
5.0
Quality
5.0
Value
4.9
Sort by
Can only recommend LBSW for new windows - great experience
Customer Service
Quality
Value
London Box Sash Windows just completed the installation of our new, double glazed windows across our mid-terraced Victorian house. We couldn't be happier with the experience, from start to finish. Jake took a lot of time during the initial consultation, explaining the options available and impact on costs. We had four quotes in the end, roughly in the same price range and decided to go with LBSW due to their professionalism and responsiveness. Harry did the technical inspection pre-installation and Judith kept us updated throughout the process. At the scheduled day of installation, Audris arrived punctually (on the minute!) and his and David's work was spotless. They both worked extremely hard, precise and left every room they worked in tidy (we didn't have to do any cleaning ourselves!). Within a week, all our windows were done, in line with the promised timeline. We could really trust the team and go about our lives and just leave them with a key, which is a great feeling. Also, there was much less redecoration needed than we feared, thanks to the team's careful way of working. Choosing a firm to work with for new windows was a big decision for us, and I can only recommend LSBW. Our house is much warmer, quieter and with no more annoying draughts, we don't regret the investment for a second.
Customer in Greater London Posted on 21/04/2024 , work completed 12/04/2024
Highest quality work
Customer Service
Quality
Value
For some time we have been working towards replacing some sash windows in our large mid-Victorian semi-detached house so as to reduce draft, make some rooms warmer, make window opening easier and hopefully safe some energy cost. After visits by several companies, it was clear from the start that LBS offered a more personalised service and listened more carefully to what we actually wanted. They were the only company to offer sash-only replacement and the only one to point out that full frame replacement would cause problems where the window frame was integrated with shutters and a plaster cornice. All the pre-installation contact was great, with a very detailed on-site discussion of all the different options. A very detailed specification/estimate was sent for checking, and then a second survey by the fitting expert to iron out the last few potential glitches. The two fitters were brilliant, changing 8 windows in 4 days, arriving promptly for a 7.30am start, and meticulously clearing up dust and rubbish to leave the house in a very good state each day. On the final evening we immediately noticed the reduction in noise and draught, and the increased warmth. We would not hesitate to use LBS again and to recommend them to others. High quality full replacement of sash windows is not cheap, but we feel that we have installed an excellent product that has greatly enhanced the comfort of our home, that will last for many years, and that has increased its eventual sale value.
Customer in Greater London Posted on 28/02/2024 , work completed 08/02/2024
Another great job
Customer Service
Quality
Value
We have used London Box Sash 4 times - and their service levels have been superb each time. Great product, installed on time, everything left tidy. But best of all, our house is warmer and quieter thanks to the double glazing.
Customer in Greater London Posted on 17/01/2024 , work completed 12/01/2024
Best investment ever
Customer Service
Quality
Value
Very high quality windows. They make a massive insulation/ sound difference. The company is properly professional and easy to deal with. That is all great. The prompt to leave a review is however Audrius, a gentle mountain of an impressive craftsman, who did all the work so carefully and so swiftly. Bravo.
Customer in Greater London Posted on 20/09/2023 , work completed 01/07/2023
Beautiful quality and excellent service
Customer Service
Quality
Value
Having originally wanted one replacement sash window, we were so impressed with the quality of the one we ordered, we went on to order four more. The build quality , insulation and acoustic properties are excellent, and the style fits perfectly into our early Edwardian house. The service was always courteous, communication precise and regular, and the fitting itself carried out with great care and consideration. We are delighted with the windows, which have made a huge difference to our previously draughty home.
Customer in Greater London Posted on 16/06/2023 , work completed 04/03/2023
Great windows
Customer Service
Quality
Value
Got 4 windows installed by these guys almost 5 years ago. Needed two more windows but unfortunately they don't do these kind of windows anymore so I ordered somewhere. And now I can truly see difference between great windows installed by London Box Sash Windows and windows installed by someone else.
Customer in Greater London Posted on 05/05/2023 , work completed 01/07/2019
Exceptional product and exceptional service
Customer Service
Quality
Value
I had all of our front windows replaced with London Boxsash wooden sash windows and couldn't be more delighted. The window demonstration was really informative and I could tell from the start that the windows were far superior to any others I'd seen. The booking process was very smooth and the installation team were by far the most professional, fast and tidy I've ever witnessed. This isn't a cheap product but represents superb value for money. Thank you
Dominic in Greater London Posted on 28/04/2023 , work completed 11/04/2023
Five star from start to finish
Customer Service
Quality
Value
From initial contact to completion everything for my new box sash window installation was a great customer experience. In fact the whole thing was enjoyable, stress free and the windows are fantastic.
Leo in Greater London Posted on 14/04/2023 , work completed 27/03/2023
Fantastic company
Customer Service
Quality
Value
We used London Box Sash a few years ago for our London flat and despite having since left London we recently decided to use them again to replace some original sash windows in our new house after having such a great experience previously. I’m delighted to say that their quality and craftsmanship has remained exceptional. The quality of their product is second to none, their windows are genuinely fantastic. Everything is very clearly explained upfront by the team (Jake, Harry and Judith are all fantastic) and their fitters are so courteous and thorough. Raf was our fitter this time around and he was so knowledgable and friendly. We honestly cannot recommend them enough.
Customer in Surrey Posted on 18/02/2023 , work completed 16/02/2023
Expert advice, great product, quality fitting service
Customer Service
Quality
Value
We had a loft extension with double dormer mansard windows fitted about 10 years ago. The timber windows windows did not last very well and we were looking to replace them. I came across London Box Sash Windows work on a house where my company Complete Kitchens ( a fellow Which Trusted Trader member ) was fitting a kitchen. The customer happily gave me their contact details and after submitting drawing to them for provisional costings we arranged for Patrick to come along and do a full survey and provide final costings. We opted for the 50 year guaranteed hard wood sash windows, which although not a cheap product we wanted something that would stand the test of time. Because we already had a scaffold in place and we’re paying rent on the scaffold the team at London BoxSash even fitted us in earlier than expected which was a great help. We are very pleased with the end product and their friendly and expert fitters . Nothing was too much trouble . We would have no hesitation in recommending them to friends, family or future clients. A great job by a great company. Thank you London BoxSash.
Phillip in Greater London Posted on 12/01/2023 , work completed 28/11/2022