Old - Single glazed wood sash windows x 8 New - Double glazed upvc wood grain sash windows x 8 SJB Windows were BRILLIANT! Quote - good value, precise and beat numerous other FENSA compa... See more
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Review summary
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What people talk about most
Reviews shaping this summary
I was very impressed with SJB throughout - from the first visit to the installation itself, everyone we dealt with was professional, helpful and really efficient. The fitting was extremely smooth and... See more
Company replied
The windows are beautiful and look really great installed. The entire process from measuring/ordering/fitting was incredibly smooth and the fitter was a total craftsmen leaving a very professional fi... See more
Company replied
The three guys (CJ, Leroy and Blogi) were all really conscientious and hard-working professionals. I had 10 windows replaced and they clearly realised that it was a big and stressful deal for me - so... See more
Company replied
Company details
Information provided by various external sources
We’re a family-run business specialising in both manufacturing and installation of traditional sash windows. Although we mainly install our sash windows in London & the south-east of England, our sash window services reputation is known much further afield.
Contact info
United Kingdom
- sjbsashwindows.co.uk
4.8
Excellent
329 reviews
Asks customers to review
This company invites their customers to review, whether positive or negative
Replied to 100% of negative reviews
Typically replies within 1 week
How this company uses Trustpilot
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Installing wooden sash windows
Website, communications, site visit and getting a quotation was handled well. Competitive price quoted. Lower than competitor we'd shortlisted. Able to schedule a slot for installation more swiftly than expected. Work was carried out professionally and a high standard.
5 November 2025
Reply from Sjbsashwindows
Dear Andrew,
Thank you so much for your kind feedback! We’re delighted to hear that you were pleased with our communication, pricing, and installation process. Our team always aims to deliver great value and high-quality workmanship, so it’s wonderful to know we met your expectations. We truly appreciate you choosing us and hope you enjoy the results for many years to come.
All the best,
The SJB team
Great windows and installation
The window installers were efficient, polite and took loads of care. They clearly loved installing the windows and were proud of how good it looks. As are we!
29 October 2025
Reply from Sjbsashwindows
Dear Mark,
Thank you so much for your lovely feedback! We’re delighted to hear that our installers made such a positive impression and that you’re as pleased with the finished result as they were proud to deliver it. We’ll be sure to pass on your kind words to the team, they’ll be thrilled to know their care and craftsmanship were appreciated.
Wishing you many years of enjoyment with your new windows!
Warm regards,
The SJB Team
Very professional service
I had a great experience with SJB replacing wooden 3-bay sash windows. The whole process was efficient and professional from sales through to survey and installation. I found the team very helpful and pleasant to deal with (answering all my many questions with patience!). The installation went smoothly with very little mess and the windows look great.
22 October 2025
Reply from Sjbsashwindows
Dear Nick
Thank you so much for your kind words and for taking the time to share your experience! We're delighted to hear that you’re pleased with your new sash windows and that the whole process, from sales to installation, met your expectations. Our team always strives to make every step as smooth and stress-free as possible, so it’s wonderful to know their efforts made a difference. We really appreciate your feedback and hope you enjoy your windows for many years to come!
All the best,
The SJB team.
Excellent experience
We had PVC replacements of both sash and casement windows fitted. The fitters (Cydrell and Dominic) were extremely professional and worked rapidly finishing the whole house within a week. The disruption during fitting and retouch painting needed afterwards was much less than expected. The new windows look great!
17 October 2025
Unprompted review
Reply from Sjbsashwindows
Dear Fiona,
Thank you for taking the time to share your review.
We are delighted to hear the team did a great job and that you are happy with your new windows. We have passed your words over to the installers.
Once again, thank you so much for taking the time.
All the best,
The SJB team.
Thanks to CJ, Leroy and Blogi!
The three guys (CJ, Leroy and Blogi) were all really conscientious and hard-working professionals. I had 10 windows replaced and they clearly realised that it was a big and stressful deal for me - so did their level best to proactively reassure me and to explain what they were doing. No detail was too small for them and they never made me feel that I was pestering them (even when I relayed on concerns from the block management). I was very grateful to them for working so hard to clean up the dusty mess afterwards.
All in all, this job went just about as smoothly as possible.
13 October 2025
Reply from Sjbsashwindows
Dear Jonathan,
Thank you for taking the time to share your feedback about your experience with us. Your review means a lot to us, and we're thrilled to hear that you were satisfied with our service and our products.
I have passed your message onto the guys.
Thank you once again for your kind words and support.
The SJB team.
Best regards,
The SJB Windows Team
First rate service, great quality, good price
First rate service from this well-established family firm – from initial contact through to the final invoice. Very well-made windows, professionally installed. Competitively priced.
6 October 2025
Reply from Sjbsashwindows
Hi Henry,
Thank you for taking the time to leave us a review and for your kind words about our team, the installation and the company as a whole. We're really pleased to hear you were happy with the whole process.
Best regards,
The SJB Windows Team
Good job overall
Overall the experience with SJB Windows was good with prompt email communications, helpful staff and a clean and efficient window installation. The only fly in the ointment was an unforeseen and fairly last minute change in the installation date which, fortunately, was ok.
30 September 2025
Reply from Sjbsashwindows
Hi Kevin,
Thank you for taking the time to leave us a review and for your kind words about our team and the installation. We're really pleased to hear you were happy with the communication and the quality of the work.
We do apologise for the change in your installation date. Unfortunately, this was due to one of our installers being unexpectedly signed off for a period of time, which was out of our control. We did our very best to stick to the original schedule and were able to complete your installation just four days later.
We appreciate your understanding, and we're glad everything worked out smoothly in the end. If there's anything else you need, please don't hesitate to get in touch.
Best regards,
The SJB Windows Team
Very professional from start to finish
Very professional from start to finish, friendly service, clear communication and excellent quality installation. I would definitely recommend!
3 October 2025
Unprompted review
Reply from Sjbsashwindows
Hi Emily,
Thank you so much for your lovely review! We're really glad to hear you were happy with the whole experience from the communication to the installation. It was a pleasure working with you, and we truly appreciate your recommendation and support.
All the best,
SJB Sash Windows
Incredibly knowledgable and did an…
Incredibly knowledgable and did an amazing job replacing a window. We loved it so much we are having them back to replace more
4 October 2025
Unprompted review
Reply from Sjbsashwindows
Hi Martha,
Thank you so much for your kind words and for taking the time to leave a review! We're really glad to hear you're happy with the work, and we're looking forward to coming back to help with the next set of windows.
See you soon,
The SJB Sash Windows Team
Excellent service
Extremely polite and professional team of people. The man who came to look at the job gave me information and advice on all the options open to me. The quote, with said options, came through very quickly. I was given a date when the work was likely to begin and received frequent updates in the lead up to that date. The chap who came to fit the windows was polite and friendly, fitted the windows with care and attention and cleared up very well before he left.
Couldn’t ask for more and would definitely recommend.
30 September 2025
Reply from Sjbsashwindows
Dear Ruth,
Thank you for taking the time to share your feedback about your experience with us. Your review means a lot to us, and we're thrilled to hear that you were satisfied with our service and our products.
We are constantly striving to improve, and your insights help us continue to provide the best possible experience for our customers.
Thank you once again for your kind words and support.
The SJB team
Helpful, considerate and efficient
SJB sash windows were helpful and efficient at each stage of the process from early advice and estimates through to final installation. We have returned to them three times which demonstrates our confidence in the company and we’d have no hesitation recommending them to others.
26 September 2025
Reply from Sjbsashwindows
Dear Anna,
Thank you for taking the time to share your feedback about your experience with us. Your review means a lot to us, and we're thrilled to hear that you were satisfied with our service and our products.
We are constantly striving to improve, and your insights help us continue to provide the best possible experience for our customers.
Thank you once again for your kind words and support.
The SJB team
Garage Conversion
Just had windows and french doors put in my garage conversion. Communications could definitely do with some work but the product is excellent and the installation was quick and done to a high standard. Will use them again for sure.
18 September 2025
Unprompted review
Reply from Sjbsashwindows
Hi James,
As per our correspondence you have left this review for the wrong company.
Kind regards,
The SJB team.
Excellent throughout
Very thorough initial consultation with clear explanation and time spent.
Installation was faultless, constantin was professional, efficient and it was a very positive experience all round. No mess and a lovely job.
Lovely quality window and a perfect replacement for the victorian sash.
8 September 2025
Reply from Sjbsashwindows
Thank you for taking the time to share your feedback about your experience with us. Your review means a lot to us, and we're thrilled to hear that you were satisfied with our service and our products.
We are constantly striving to improve, and your insights help us continue to provide the best possible experience for our customers.
Thank you once again for your kind words and support.
The SJB team
Yes to SJB Windows!
Old - Single glazed wood sash windows x 8
New - Double glazed upvc wood grain sash windows x 8
SJB Windows were BRILLIANT!
Quote - good value, precise and beat numerous other FENSA companies.
Queries - always efficient in answering any questions which were many. As you can imagine, fully replacing all windows is costly and time consuming so finding the right company is very important.
Installation - Internal so no need for scaffolding and all completed by the amazing Constantin whom removed old and then installed 8 new sash windows in only 5 days (originally expected 8 days!) in addition to leaving my home tidy everyday he was there.
My appreciation to SJB Windows for making the process run smoothly!
8 September 2025
Reply from Sjbsashwindows
Thank you for taking the time to share your feedback about your experience with us. Your review means a lot to us, and we're thrilled to hear that you were satisfied with our service and our products.
We are constantly striving to improve, and your insights help us continue to provide the best possible experience for our customers.
Thank you once again for your kind words and support.
The SJB team.
installation
your installers were fast ,efficient and very tidy .Some of the finishing around the windows could have been neater but overall very good.
22 August 2025
Reply from Sjbsashwindows
Dear Alan,
Thank you for taking the time to share your feedback about your experience with us. Your review means a lot to us, and we're thrilled to hear that you were satisfied with our service and our products.
We are constantly striving to improve, and your insights help us continue to provide the best possible experience for our customers.
Thank you once again for your kind words and support.
The SJB team.
Fantastic windows
Fantastic windows, we are really noticing the difference in sound and temperature! The office and installations teams are all very professional and friendly, leaving the place nice and tidy. Really happy with the finished result 8 windows later in 3 phases. I highly recommend SJB.
22 August 2025
Reply from Sjbsashwindows
Dear Helena,
Thank you for taking the time to share your feedback about your experience with us. Your review means a lot to us, and we're thrilled to hear that you were satisfied with our service and our products.
We are constantly striving to improve, and your insights help us continue to provide the best possible experience for our customers.
Thank you once again for your kind words and support.
The SJB team.
Important lesson, always take photos of the works done both inside and outside, before and afterwards
Feedback in response to SJB Sash Windows comments of 27/08/25:
Thanks for reiterating your perspective however, it is not helpful or indeed fair to dismiss the building contractors assessment as them trying to cover for their poor work, I will of course let them know what you think.
It is 'interesting' that there have not been any issues with the rest of their work, its only this cill? It is also 'interesting' that the damaged cill was also uniquely subjected to the installers dragging the two new windows across it along with some of their equipment as well as the physical forces to remove the frame from the surrounding wall?
It may be 'unusual' for someone to come back after 2 years but that doesn't discount their case. I've already acknowledged that I cannot prove definitively what caused the damage however, there is a lot of circumstantial evidence which you seem very happy to discount.
It is unusual however, for a company to refuse to even consider that their might be something to learn, something that they might help put right.
Feedback in response to SJB Sash Windows comments of 26/08/25:
Like most customers I assumed (perhaps naively) that any damage done would be repaired. I did highlight that because none of my photos of the before and after included the cill, I could not show definitively that this was done by the window installers so I sought the advice of the builders who carried out the external works the previous summer. They reassured me as the work they did to properly repaired this cill and as I had full confidence in them given the condition of all the other works they carried out, I asked them to call you and detail this for you to consider. However, you were not interested in hearing them and seemed to revel in sending me the Ts&Cs, it felt like a real 'we told you so' moment. As I stated, I never expected you to accept full responsibility but I had hoped for some compromise especially given the significant amount of money I spent with SJB, instead I was told tough luck. It doesn’t feel like a good customer experience.
Original feedback:
3 years ago the house I live in underwent major external works including repointed the brickwork, repairing and painting windows and cills. 2 years ago, I replaced 2 windows using SJB sash windows. The brothers who installed them for SJB, needed to come back to change the internal fixtures which were installed incorrectly. It took 3 attempts to get them to do this. With all of this, and as I had focused on the inside issues, I did not take photos of the outside walls or cills as well.
This summer, the builders who did the original work on the outside of the building checked the cills. The crack they had repaired had opened up again. When I asked what caused this, they said it was likely that the work done to remove the old window had done it. There is no other explanation for this damage, plus the none of the others cills are damaged. They even rang SJB on my behalf to detail their previous work to repair this cill but SJB weren’t interested.
SJB refused to acknowledge any responsibility and quoted the small print and legal clauses. I never expected them to take responsibility but hoped for some compromise but they refused point blank which is disappointing. I also understand SJB have since parted ways with the workers who installed my windows.
Advise to all, take photos not only of the windows and surrounding fixtures inside but also the outside surrounds of the window, the cills, the walls and mouldings plus check the materials used, before and after any works carried out.
31 July 2025
Reply from Sjbsashwindows
Thank you for taking the time to leave a review. However, we feel it’s important to respond with some clarity and context.
First, we understand your frustration regarding the issue you've raised. However, it is highly unusual for a concern to be brought to our attention more than two years after the original installation—particularly when, as you’ve acknowledged, there is no clear evidence that the problem was caused by our work. In fact, your own contractor, whose opinion your claim is based upon, contacted us directly and admitted there could be multiple reasons why the crack reappeared. They also acknowledged it was likely to recur and require ongoing maintenance, then asked us to pay for it—despite it not falling within our scope of responsibility.
At the time of quotation, before any work was agreed, we provided detailed documentation outlining what is and isn’t included in our service. Specifically, in the clearly labelled “Important Standard Information” section, it is explained that while we take great care during installation, some post-installation repair or redecoration—particularly to sills or surrounding areas—may be required and is not part of our remit. This information is presented clearly and transparently, not hidden in small print.
We also reviewed your recent correspondence thoroughly. Our decision not to offer compensation was made by our management team based on the facts and in line with the terms of your signed contract. At no point was our response intended to be dismissive or condescending.
Additionally, it’s worth noting that you have chosen to work with us on further projects since the original job, which we took as a sign of your satisfaction at the time. This makes the tone and nature of your recent review all the more disappointing.
Regrettably, we’ve also observed that you have a history of leaving negative reviews across multiple platforms when outcomes do not align with your expectations. This pattern suggests an attempt to pressure businesses into meeting demands that go beyond the original scope of work.
We maintain full photographic documentation from every stage of the process—sales, survey, installation, and after completion—which clearly shows that the work was carried out correctly and in accordance with the agreed specifications.
Given the false and damaging nature of some of your public comments, we are now referring this matter to our legal team for review, with a view to taking appropriate action regarding defamatory and slanderous statements.
We pride ourselves on being professional, transparent, and fair in all dealings, and while we regret that we were unable to reach a more positive resolution, we stand by the quality and integrity of our work.
Kind regards,
The SJB Sash Windows Team
We had three new windows fitted
We had three new windows fitted. Communication was excellent throughout the process and the quality of work was great
13 August 2025
Unprompted review
Reply from Sjbsashwindows
Thank you for taking the time to share your feedback about your experience with us. Your review means a lot to us, and we're thrilled to hear that you were satisfied with our service and our products.
We are constantly striving to improve, and your insights help us continue to provide the best possible experience for our customers.
Thank you once again for your kind words and support.
The SJB team.
We had a new door and 6 sash windows…
We had a new door and 6 sash windows fitted by SJB.
From the initial quote to the fitting they were pleasant, quick and professional. Very happy with the results and would use them again.
28 July 2025
Unprompted review
Reply from Sjbsashwindows
Dear Rod,
Thank you for taking the time to share your feedback about your experience with us. Your review means a lot to us, and we're thrilled to hear that you were satisfied with our service and our products.
We are constantly striving to improve, and your insights help us continue to provide the best possible experience for our customers.
Thank you once again for your kind words and support.
The SJB team.
Major install error and soundproofing false promise
We engaged SJB Sash Windows to install new sash windows in our home, prioritising improved soundproofing because we were about to welcome a newborn. From the outset, communication was polite and prompt, but unfortunately the overall experience has been quite disappointing.
Quality of Installation
The installation was plagued with problems from the start. Several of the latches did not rotate smoothly, catching or sticking, which made them difficult to use. One of the windows was almost impossible to open and is still a lot stiffer than the rest. Most concerningly, one of the windows was installed incorrectly with the sash weights the wrong way around, which meant it couldn’t operate properly and immediately required remedial work. This remedial work resulted in scratches, gouges, scuffs, and chipped paint on the woodwork — an unacceptable standard given this was a premium product. One fitter even left paintbrush remnants in our bathroom drain, blocking it for days until we discovered the cause - perhaps an indication of general carelessness. Despite multiple return visits, the finish remained below what we would expect and left us with windows that still don’t feel right.
Soundproofing Claims
A major reason for choosing these windows was the promise of significantly reduced outside noise. We were told to expect about a 65% improvement, especially with the upgraded acoustic glazing. In practice, there has been no measurable improvement, even after checking with a decibel meter. The company later clarified the reduction figures applied only to the glass itself rather than the room as a whole. This felt extremely misleading, given we had made our soundproofing priorities crystal clear from the beginning.
Customer Service
The team were generally polite and responsive in arranging follow-up visits, but coordinating them became stressful and time-consuming, particularly while juggling life with a newborn. There was no goodwill gesture or discount offered despite the inconvenience and substandard finish. Multiple remedial visits took up our time and energy and undermined our confidence in the quality of the work. It took many messages, calls, and repeated visits to address the same points, which left us exhausted and discouraged from continuing.
Overall
We paid a substantial amount for what we hoped would be a high-quality, low-hassle installation. Instead, the result was multiple remedial visits, a lack of confidence in the soundproofing claims, and ongoing frustration. While the company seems willing to try to fix mistakes, we did not feel they ever fully acknowledged the shortcomings in their sales messaging or the overall customer experience.
We are now left with a product that we do not feel delivers on its promises, and with some damage to surrounding paintwork in our home that we will likely have to rectify ourselves.
I would suggest anyone considering SJB Sash Windows take great care to get all guarantees and performance promises in writing, and to be prepared for a potentially drawn-out aftercare process if things go wrong.
13 June 2025
Unprompted review
Reply from Sjbsashwindows
Dear Kris,
Thank you for taking the time to share your feedback. We're genuinely sorry to hear that your experience didn’t live up to expectations, particularly during such an important and busy time for your family. We appreciate your detailed comments and the opportunity to respond.
While we strive for perfection in every installation, we also recognise that, from time to time, things can go wrong — such is human nature. What we pride ourselves on is how we respond when they do. Our commitment has always been to resolve any issues promptly, thoroughly, and with as little inconvenience to you as possible.
On the topic of remedial visits, we want to clarify that our records show both appointments were scheduled with minimal back-and-forth — a single email was sent on each occasion, with proposed dates that you kindly accepted. However, the reason a second visit was required is that we received notification of an additional issue by email on the day of the first visit. Had we been made aware of this beforehand, we would have allocated more time to address everything in one visit and spared you the need for a return appointment.
We’d also like to clarify that suggesting we’ve left you to deal with paintwork damage yourself is not accurate. We have offered to send one of our senior installers to fully rectify any and all outstanding issues, including the paintwork, and that offer remains open. We're more than happy to arrange this at a time that suits you.
With regard to the soundproofing, we advised that the acoustic glazing used offers up to 65% better performance compared to standard single glazing, specifically in terms of reducing sound transmission through the glass itself. At no point did we state that this would result in a 65% reduction in overall room noise levels, as many other factors — such as building structure, frame type, ventilation, room size, ceiling height, surface material e.g carpet vs hardwood— influence total sound insulation and room acoustics. We understand that soundproofing was a key priority for you, and we’re sorry if the distinction wasn’t as clear as it could have been.
Although we regret that your experience was not as smooth or satisfactory as it should have been, we appreciate your honest review. Feedback like yours helps us continue to improve, and we remain committed to ensuring every customer — including you — feels listened to and properly looked after.
Kind regards,
The SJB Sash Windows Team
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