North London Box Sash Anmeldelser 

I highly recommend the North London Box Sash. Their customer service is second to none. I had a challenging fit due to a very limited timeframe which kept changing, but the team were incredibly accommodating - even interrupting their holiday to schedule a fit date at very short notice. The windows were fitted on the hottest day of the year but the fitters worked tirelessly in challenging circumstances - they were great! I will be definitely be using them again.

Friendly and flexible team - Luke, Mark and the fitters are true professionals. Managed expectations well and gave helpful advice. Left the house clean and the windows are gorgeous. highly recommend.

Can only recommend those guys!
They did a stunning job. They clearly have a lot of experience and a high sense for detail. I am very meticulous and precise when it comes to my house, and they absolutely exceeded expectations. You're in very good hands.

From our initial enquiry about replacing a very old bedroom sash window in keeping with Victorian house that no longer opened, to final fitting, this was one of the best customer service experiences I’ve had. Communication was great and the process simple - the company came to measure up, made the new window to look like the old one and fitted it in a matter of hours several weeks later. The window itself is fantastic - looks lovely and works smoothly. Our fitter, Henry, was incredibly efficient and simply got on with the job while I got on with my day. The room after was as tidy and clean as if nothing had been done. I couldn’t be more pleased or recommend the company more highly. Will certainly use again when the next sash window needs doing. Great quality and service

Great service from start to finish. I was dreading the whole process and put it off for a long time. The window fitting was very straight forward, the whole process was. The quality is amazing and it looks and works perfectly. I would definitely only use this company going forward.

We recently used North London Box Sash for a project on Mare Street at a building we manage, where they replaced the sash windows and doors.

We were very happy with the service throughout the entire process, from the preparation of the technical drawings through to the installation. The team were professional, reliable, and delivered a high-quality finish.

We would happily recommend North London Box Sash and will definitely be using them again for future installations.

We were pleased with our experience of North London Box Sash and would use them again. The commissioning process was comprehensive and effective and user-friendly. The on-site team were always very friendly and helpful and did their work thoroughly with skill and excellent attention to detail. Although the installation took a little longer than originally intended, we are very happy with the outcome which was completed in July 2026.

I highly recommend North London Box Sash. The preparation and installation of bespoke windows and doors in a flat in a Victorian house in a conservation area was fast and easy. Having employed them twice, I would happily use them again.

Chris Low June 2026
Luke, Mark and the team did a fantastic job replacing our Victorian garden door together with side glass panels above the door and on the sides. From the start Luke was quick to respond to my questions and was polite and patient, giving me lots of detailed information including graphic drawings of the replacement door.
When the day came for the installation, Henry and Sammy arrived early, removed the old door and side panels and installed the new one all in one day! They were friendly, easy to talk to, efficient and caring. The work went smoothly and they left the room clean and tidy. The door and side panels look beautiful. The design is just like the original one except sturdier, more secure with good locks and is doubleglazed. Thank you NLBS team.

Very bad service, using cheap materials

Luke & the fitting team managed the survey, quote & installation of our new sash windows seamlessly, the mess was kept to a minimum & once completed the walls were made good & ready to paint.

I was a furniture maker running a workshop with 12 makers, so I know what I was looking for. The quality the fittings, the materials were hundred percent perfect. No fuss on installation.
Keep up the good work.

This is the second time we have used the North London Box Sash Window Company.
We were so pleased with the work that it was a no-brainer to ask them to do the rest of the house.

The windows have transformed the house both aesthetically and in terms of comfort.
No more drafts, noise, and rattly old sashes.

The new windows are perfectly in keeping with our Victorian house, but with all the advantages of factory engineering for a precision fit.

The team at NLBSWC were incredibly polite and hardworking. Always extremely tidy with great attention to detail. I would describe them as real craftsmen.

The work was done just before Christmas, and it was nice having these people around.
We are so happy with the results and wouldn’t hesitate to recommend them.

From start to finish these guys were the best. Prompt in responding, quick to view and provide quotes and the final windows are fantastic. I’m very happy I went with them.

Definitely recommend! NLBS provided a competitive quote - after we compared five. They came round and measured everything necessary within about half an hour. Once everything was made, fitting four windows took three days. The service over those three days was excellent and the quality of the windows and the work was fantastic.

Excellent service provided from start to finish by this company.The windows look great ,are of superb quality and were fitted and finished so well by two very professional window fitters.
We are delighted with our windows and thoroughly recommend Luke who looked after our project throughout.

North London Box Sash replaced sash windows in our bathrooms, The windows are lovely, perfect replicas in our Edwardian house. The process was easy from beginning to end, and the windows were fitted with hardly any disruption to our home. The cost was also substantially cheaper for equivalent windows from other companies. We are very happy with the result.

We had North London Box Sash replace a pair of dilapidated sash windows in our top floor flat last year. I had approached 3 other companies for quotations but right from the off, Luke and the team were steps ahead with communication and professionalism.
The team communicated very well, they were reliable, respectful of our home and the work completed was excellent. I would 100% recommend them. Thank you so much for a great job.

The company was very easy to deal with. Luke came and gave us an initial meeting that was very clear and precise. He gave us the necessary information to help us make a decision as to how to progress our windows.

The guys who came to fit the windows were very polite, helpful and friendly. They got the job done in the time specified. They explained what they were doing and took great pains to do an excellent job.

We are very pleased with the result and would recommend North London Box Sash without hesitation.

North London Box Sash provided an excellent service in replacing a couple of very worn casement windows at a very reasonable cost. The team were able to carry out the work without scaffolding and were done within a few hours. A great job all round!