Endorsed by Which?

London Sash Windows & Doors Ltd

5.0

31 Reviews

Opening Hours
Today -
  • Monday 08:00–17:00
  • Tuesday 08:00–17:00
  • Wednesday 08:00–17:00
  • Thursday 08:00–17:00
  • Friday 08:00–17:00
  • 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.

About

We are a traditional Family Run business with over 20 years of direct manufacturing and installation experience .

Services & Products

Full Sapele Hardwood or Accoya Windows
Hand painted or spray finished windows & doors
Bespoke noise reducing sashes into existing frames
Heritage double glazing in new sashes fitted into existing frames
Draught proofing and overhaul existing timber windows and doors
Custom hand made joinery
Complete replacement windows and doors fitted or supplied
Ironmongery installation

Our Sash Windows & Doors are manufactured in North London.

All installation work completed comes with a
+ 10 Year Guarantee - T & C's apply
+ FENSA certificate for complete replacements -
T & C's apply
+ Insurance Back Guarantee for FENSA registered projects
+ Price match Guarantee

What we do

  • Double glazing

    • Double glazing installation
    • Double glazing repairs
    • Double glazing suppliers
  • Glaziers

    • Sash windows
    • Double glazing installation
    • Double glazing repair
    • Timber windows
    • Window consultants
  • Doors

    • French doors
    • Timber doors
    • Front door
  • More Services

    • draught proofing
    • hardwood 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.

5.0
31 reviews
Customer Service
5.0
Quality
5.0
Value
4.9
Sort by
Professional work to a high standard with a focus on their quality of service/product
Customer Service
Quality
Value
Had sash windows put in for my sitting & dining room and the master bedroom/en-suite bathroom. The team that was send to do the work was very professional in the approach and dealing with me. However, there was a mistake made during the detailed measurement phase where the paint of the new windows wasn’t matched to the paint of the box. Stuart, the director/owner of the company, was willing to correct it by sending someone to paint the inside of the new sash windows to match the box. I think it showed that this company was more interested in the quality of their service. I would use them to also do the reminder of my flat
Customer in Greater London Posted on 10/06/2024 , work completed 27/05/2024
Excellent from start to finish
Customer Service
Quality
Value
I was so impressed with everyone who I dealt with. They were polite efficient and made my life so easy. As a busy professional with limited time I just couldn’t have asked for a smoother and painless service.
Customer in Greater London Posted on 15/05/2024 , work completed 19/04/2024
FANTASTIC SERVICE FROM START TO FINISH
Customer Service
Quality
Value
I am so impressed with this company. Stuart and the team have been amazing from start to finish. We got our sash windows installed last week and I’m very happy with the results. They look like for like with our old style of sash windows, which is exactly what we wanted. The installers Ray and Paul were amazing, they always arrived and left exactly when they said they would each day, always cleaned up after themselves and were friendly, good communicators, skilled and hard working. We managed to give them a completely empty small room to use as their workshop for cutting the wood down to size, I would suggest everyone does this for the duration of the installation as it minimised mess and didn’t slow down the installation process or duration. Big thumbs up and thanks team :)
Customer in Greater London Posted on 16/04/2024 , work completed 13/04/2024
Highly recommended.
Customer Service
Quality
Value
After getting quotes from three companies, I compared prices and instructed London Sash Windows and Doors. It was an excellent decision. The standard of work was very high, they were clean, punctual and friendly. A family run business that makes you feel like one of their own. Highly recommended.
Customer in Greater London Posted on 15/04/2024 , work completed 15/04/2024
Great work
Customer Service
Quality
Value
Very professional service. Work completed all on time and within budget. Windows look beautiful. Highly recommended
Customer in Greater London Posted on 26/02/2024 , work completed 16/02/2024
Excellent work from start to finish
Customer Service
Quality
Value
V happy with the work done by LSWD -- we received a quick response to our initital inquiry, and the work was then carried out to our total satisfaction. Wouldn't hesitate to use them again.
Customer in Greater London Posted on 02/02/2024 , work completed 31/01/2024
Faultless
Customer Service
Quality
Value
It’s a big decision to get double glazing. I got lots of advice, did lots of research and then requested quotes from 3 companies. LSWD distinguished themselves right away with beautiful, accurate, detailed drawings. I asked to see their work for another customer and went to visit her. She was delighted and her windows looked lovely. So the decision was made. From then on it was all plain sailing. Two visits from very courteous experts to measure up. A clear payment plan. All my questions (I had a lot!) were answered helpfully. There was a long lead time but the agreed date was fixed and communicated clearly. The three gentlemen who fitted my four windows and French doors were a delight. Efficient, tidy, patient with my questions, thoughtful, punctual and expert. Their work is immaculate. All the brass fittings are lovely, high quality and nice to touch. The windows look wonderful inside and out. And it’s so quiet! After they had gone I had another question. That was answered reassuringly, leaving me 100% satisfied with everything.
Customer in Greater London Posted on 19/12/2023 , work completed 29/11/2023
Great workmanship and faultless service
Customer Service
Quality
Value
Just had 3 new double glazing sashes installed. They were amazing from start to finish. Very clear in their approach, great communication and there installation team couldn't have been more friendlier and spotless. We live in a conservation area and the windows are an exact copy of what we had before. Can only recommend these guys.
Customer in Greater London Posted on 01/12/2023 , work completed 30/11/2023
Four new sash windows and door draught proofed.
Customer Service
Quality
Value
Excellent work and customer service from beginning to end. The office always responded to emails and confirmation was always put in writing. All site visits were helpful and and attention to detail. The men installing the windows were on time polite and considerate.
Customer in Greater London Posted on 07/11/2023 , work completed 23/10/2021
Experienced, helpful and reliable
Customer Service
Quality
Value
We needed a new box sash window supplied and fitted in our rear bedroom, complete with pre-finished ironmongery and draught-proofing. Melvyn from London Sash Windows & Doors Ltd did a detailed inspection, took measurements, and gave us a competitive quote with full details of how the job would work, phased payment schedule etc. (including final instalment payable after job completion). All communications with the company were very friendly, timely and professional, and our work was completed beautifully to the agreed schedule and on budget. With very old and dried-out plasterwork around our old window, I appreciated Melvyn pointing out in advance that some extra plastering repair work MIGHT be needed once the job was complete. In fact, the friendly fitting team worked really hard all day on our job, and they managed to leave the surrounding wall - and the room itself - in a near-perfect state. Thanks to Roland and his colleague for the care they took. I was extremely pleased with this job and would definitely use London Sash Windows & Doors Ltd again.
Customer in Greater London Posted on 01/08/2023 , work completed 17/07/2023
Double Glazed Heritage Sash Windows Replacement
Customer Service
Quality
Value
I wanted to upgrade my old sash windows to double glazed. I live in a conservation area so was forced to only consider wooden sash windows. I chose LSW&B after getting a few quotes. They were one of the only companies that could fit double glazed sashes to existing frames. I chose them as the other quotes that I received were for whole new frames and were more expensive, would require more extensive work, plus would not be as slim as the replacement sashes from this company. After their survey, I contacted my local Council and was told I needed planning permission. The surveyor, Melvyn, from LSW&B helped provide drawings for the planning application in a timely fashion. Melvyn re-visited for a detailed survey once I'd obtained planning permission, and updated the quote. He held the prices from the original quote despite the 30 days having expired. The new sashes are simply stunning and the whole window now looks amazing. The team refurbished the existing box frames and double-primed all the wood, so it is weather proof until I can get it painted with a gloss finish. The sashes themselves are fully painted. Harry and the installation team were really professional, skilled, and courteous. They went the extra mile with protection of our property and with cleaning, which are areas where a lot of contractors have let us down in the past. We are also absolutely delighted with the quality of the new windows and wouldn't hesitate to recommend them.
Customer in Greater London Posted on 04/07/2023 , work completed 03/07/2023
Beautiful sash windows, friendly and considerate workmen
Customer Service
Quality
Value
As anyone buying property in London knows, the beautiful high ceilings and large windows that come with a period property also usually come with single glazing, constant rattling and rotting wooden frames. When it came to solving this issue my partner and I were keen to find someone who would quote us for restoration as well as full replacement. LSWD were able to provide an initial quote very promptly by email, followed by a more accurate and in-depth quote following an in-person visit. We opted to replace the sashes of our windows but restore the box frames themselves. They were very patient with us and our co-freeholders as we uhmed and ahhed over how many windows in the building we wanted doing, and not at all put out when it turned out our flat would be the only one. They were very clear and upfront about how long the whole process would take, and once the new sashes had been made the actual installation process was quick and pain-free (3 days to replace 4 windows with a team of two). The workmen who came to our flat were absolutely lovely; they cleaned up as they went and, if anything, left our flat cleaner than they found it. The windows themselves look fantastic - they were able to replicate the original style and match the interior paint colour very closely. I would highly recommend LSWD to anyone looking to restore or replace their timber windows.
Customer in Greater London Posted on 29/01/2023 , work completed 20/01/2023
Fantastic job
Customer Service
Quality
Value
The sash windows in my flat were in a terrible state - rotten and some of them falling apart. Stuart's quote to replace 7 windows was approx a third of another one that I had, and my tenants said that from the moment they met him they were impressed with his approach. In fact, in a message to me they said "The results are AMAZING, they've made a real difference. Also have to comment on how lovely and professional the team are, they've been a pleasure to have around."
Customer in Greater London Posted on 31/08/2022 , work completed 01/08/2022
Great job
Customer Service
Quality
Value
Genuinely great work by these guys. I had 6 sash windows refurbished and draught proofed. Stuart and the office were on it from the start, and most helpful. The team who came to do the work were punctual, courteous, pleasant, tidy, and just got on with it, and I'm very happy with the result. Thanks!
Customer in Greater London Posted on 10/03/2022 , work completed 04/03/2022
Quality Installation
Customer Service
Quality
Value
Fantastic no-fuss replacement of our front bay windows. London Sash Windows arrived exactly as planned and replaced our windows in a clean and tidy manner very efficiently. Clearly experienced, the fitters were polite and delivered a high-quality installation within the predicted time advised. I'd definitely recommend the service - our windows are looking great and the installation disruption was minimal - Many thanks.
Customer in Greater London Posted on 04/03/2022 , work completed 23/02/2022
Superb all round.
Customer Service
Quality
Value
I used London Sash Windows and Doors to replace some old timber sash windows. They were superb to deal with, from start to finish. The initial meeting was very efficient. They explained to me that it was not necessary to replace the complete window box, which led to a significant cost saving. The team that arrived on the day were friendly, got the job done swiftly and left my flat cleaner than when they arrived. The windows have substantially reduced noise, the flat is much warmer and my condensation issues are fixed. I wouldn't hesitate to recommend London Sash Windows and Doors to anyone.
Customer in Greater London Posted on 26/02/2022 , work completed 18/02/2022
Highly professional job with which I am completely satisfied at this point
Customer Service
Quality
Value
I needed double glazed sash windows fitted to replace existing sashes in a tall London Victorian house. The initial consultation was careful and supportive. I was advised well on what did not need doing as well as what did. In the end I had six sash windows replaced. A second visit was arranged to make precise measurements of what was required. The windows were manufactured in the firm's workshop, and they were then fitted on site over two short days by what seemed to me a very competent team. They were considerate of my needs, worked tidily, showed me and explained to me what they were doing and checked with me appropriately on the window furniture. The final result looked excellent and, to date, all the windows have functioned well. I would/will recommend the firm to friends. It was not cheap, but the quality of the work was high and I saw no reason to regret paying a substantial price for excellent work.
Tony in Greater London Posted on 25/02/2022 , work completed 17/02/2022
Sash windows in Victorian house.
Customer Service
Quality
Value
This was to double glaze four large front windows, also secondary glazing for a stained glass window and improving insulation for a side door. We are very pleased with the new windows which fit in perfectly with the look of the house. The work was done as agreed, the team who came were very pleasant, extremely hard-working and thorough and Stuart was always helpful. The only problem was an error with sizing the secondary glazing but this was remedied quickly. Overall very satisfied with this company.
Customer in Greater London Posted on 23/02/2022 , work completed 17/02/2022
Excellent work
Customer Service
Quality
Value
I'm delighted with the service given by Stuart and his team at London Sash Windows & Doors. The quote for replacing a sash window with a new double-glazed one in a frame which wasn't square was the most reasonable of three. Stuart was very helpful in providing the quote and answering questions, and the fitters did an excellent job in putting draught-proofing round the frame and then installing the new window. They worked extremely hard all the time without taking breaks, and did a wonderful job of vacuuming and clearing up when they had finished. I would strongly recommend this company.
Customer in Greater London Posted on 04/02/2022 , work completed 21/01/2022
Great work.
Customer Service
Quality
Value
The window in the room was made to perfectly fit the not very rectangular window frame. The fitters were extremely professional, clean and tidy. They spent a lot of time making sure that the window was fitted and caused absolutely no damage to the original frame, which was an added bonus. The room is now warm and quiet and the window opens smoothly despite the frame not being square. All correspondence with the office was answered swiftly and professionally making this purchase very simple. I would definitely recommend London Sash Windows and Doors to anyone wanting to replace their old windows with a double glazed unit.
Lucy in Greater London Posted on 04/02/2022 , work completed 08/01/2022
Great Job and all on time
Customer Service
Quality
Value
From the first visit to the completion of the work, everything ran like clockwork. The person who came to do the estimate ( Stuart) arrived on time, was highly professional and provided good advice and a full estimate quickly. Problems with the supply of material at the time were explained and a realistic date for carrying out the work set. The work team arrived at 8 am ( as advised) and worked solidly throughout the day and a half they were here with hardly any breaks. They kept us informed of progress and ensured we were happy with various parts of the process. They repaired 4 sash windows ( two with new double glazing), removed secondary glazing from one and draft proofed all four. They also repaired two window sills. The job was more complicated as we have Banham grills on 3 of the windows which they had to remove and replace. All work was carried out efficiently and they cleaned everything up after them ( including a tidy up at the end of day 1- which we said was ok to leave but they said they liked to leave things in order!). We were very impressed by the quality of the workmanship and the pride they all took in their work. This is a family firm and it shows. We were given an estimate of two days but the work was completed in a day and a half as there were 4 in the team who worked together really well. I would highly recommend this company.
Carolyn in Greater London Posted on 18/01/2022 , work completed 11/01/2022
New double-glazed sash windows
Customer Service
Quality
Value
Stuart and the team replaced our sashes with new, double-glazed ones. The quote was the most competitive one we received out of 3 From the start Stuart has been professional and offered valuable and pragmatic advise. All the works were completed on schedule and on budget. After the installation, there were a couple of minor issues to be rectified, and the team came back quickly to solve these to our satisfaction. We were very happy with the service and would recommend London Sash Windows & Doors
Customer in Greater London Posted on 30/11/2021 , work completed 13/11/2021
Impressively professional and pleasant to deal with
Customer Service
Quality
Value
We had five sash windows and our balcony doors replaced. From the moment Stuart came to estimate we knew we were in safe, competent hands. The timetable and the payment schedule were clearly laid out and kept to, with good communication all the time. The team who came to do the work were a delight - enthusiastic, committed and thoughtful with a keen eye to quality and to finish. They were punctual, efficient and good problem solvers - the doors had to be hoisted up two floors, then in one window and out another to reach the balcony. It's a family business so there was a sense of collective pride in their work, their reputation and their high standards. The attention to detail was outstanding - the beading had to be the right width, the door handles the right height and the paint finish perfect and they were happy to work until they were satisfied. It was an absolute pleasure doing business with them from start to finish.
Customer in Greater London Posted on 26/11/2021 , work completed 24/11/2021
Great works to sticking door
Customer Service
Quality
Value
In my part of London many properties use the services of this firm which is now I came to learn about them. A door leading into my property was swelling when the sun was on it making it almost impossible to open. Stuart came up with an ingenious solution to rectify the issue without having to shave part of the door away which would have affected the security locks. The team came out on a Saturday to do the works, arrived exactly when they said they would, and did all the necessary repairs efficiently and courteously. Delighted with the end result and would have no hesitation in recommending them.
Customer in Greater London Posted on 22/11/2021 , work completed 20/11/2021
Great company
Customer Service
Quality
Value
Had a great experience with LSWD. Stuart came round to look at our sash windows that needed fixing. He was really lovely and honest and the quote was reasonably priced. The team that came round to do the work were great, polite and neat. We are very happy and would recommend.
Customer in Greater London Posted on 18/11/2021 , work completed 02/11/2021
Professional sash window repairs
Customer Service
Quality
Value
I'm delighted with the service offered by London Sash Windows & Doors. The end product is just what was required and Stuart Mathieson was easy to deal with throughout. He and his team understand the oddities and craft of sash window repairs. They replaced a window pane, a catch, sash cords and a lock, whilst also refurbishing and draught-proofing two windows in our bathroom. It was a cramped space, and the risk of damage to sanitary ware was high. But they left not a scratch and were able to undertake a great finish on the windows.
Kerry in Greater London Posted on 13/07/2021 , work completed 10/07/2021
Endorsement reference
Customer Service
Quality
Value
We had two new sash windows fitted and one refurbished and double glazed. The team on the day were incredibly professional, polite and cleaned up after themselves. I would highly recommend.
Which? Trusted Traders Consumer Posted on 06/05/2021 , work completed 06/05/2021
Endorsement reference
Customer Service
Quality
Value
Very happy with the interaction, assessment, advice and the job done
Which? Trusted Traders Consumer Posted on 06/05/2021 , work completed 03/02/2020
Endorsement reference - The best in London!
Customer Service
Quality
Value
London Sash Windows & Doors fitted new 5 new timber sash windows in my newly-renovated apartment. I have to say their service was absolutely flawless from start to finish. I dealt directly with Stuart who was always extremely clear and prompt with his communication, answering all my questions and concerns in a timely manner. He was very well-informed about what repair work I needed on my windows and even suggested cost-saving solutions, where he could have made more money. London Sash Windows & Doors are an excellent, efficient and well-run company. They are knowledgeable and can be trusted to complete the job to a top level. I highly recommend these guys.
Which? Trusted Traders Consumer Posted on 06/05/2021 , work completed 06/05/2021
Endorsement reference
Customer Service
Quality
Value
I received a detailed and clear quote for the works with an itemised break down of works and items provided. When the windows were fitted, the crew on site worked swiftly and professionally and the communication was very clear. The final installed windows are very beautiful, well made, and have made a big difference to our well being in the house. Overall I would like to recommend London Sash Windows and Doors as a reliable and good quality provider of historic sash window repairs and new window installation.
Which? Trusted Traders Consumer Posted on 06/05/2021 , work completed 06/05/2021
Endorsement reference The best in London!
Customer Service
Quality
Value
London Sash Windows & Doors fitted new 5 new timber sash windows in my newly-renovated apartment. I have to say their service was absolutely flawless from start to finish. I dealt directly with Stuart who was always extremely clear and prompt with his communication, answering all my questions and concerns in a timely manner. He was very well-informed about what repair work I needed on my windows and even suggested cost-saving solutions, where he could have made more money. London Sash Windows & Doors are an excellent, efficient and well-run company. They are knowledgeable and can be trusted to complete the job to a top level. I highly recommend these guys.
Which? Trusted Traders Consumer Posted on 15/04/2021 , work completed 19/03/2021
The trader replied (on 21/04/2021)
Thank you for your kind words. They are greatly appreciated. Thanks, Stuart