Core Sash Windows

I was looking to draughtproof and repair period sash windows in my London flat. After a first visit from Ryan, I received a couple of options in the mail and quickly settled on one: draughtproofing / repairing the four largest windows (kitchen and living room), and replacing the sash in the smallest window (bathroom). The draughtproofing was quickly completed, and although we experienced a small delay, so was the replacement for the smaller window. I can't fault the quality of the work conducted: the old sashes now glide very smoothly, and the draughts have been completely eliminated. No more small bugs finding their way through the gaps either. They also had patterned glass in stock to match and replace existing broken panels. Note that they don't redecorate when draughtproofing only, so you'll have to budget for a decorator to repaint your windows after. The new sash in the smaller window is perfect, and they did redecorate that window after. It wasn't cheap, but I'm definitely pleased with the results.

Incredibly pleased! They installed 14 sash windows - entire box replacement, 2 french windows (1 sliding aluminium & other old style wooden 2 door) and 1 small modern single opening wooden door - all double glazed. Also, did draught proofing of 2 doors & double glazed an old fan window above french windows. The finish is impeccable. The surveyor, Sam, was very helpful & did an excellent job measuring. They filled & painted around the windows inside & out. There were no problems whatsoever. Their quote was much more reasonable than some other sash window companies & they had far less demands than other companies who were charging for extra things that were surplus to requirements of the work. Other companies were saying they couldn’t replace an old french window as they were worried the fan light above might collapse. Core Sash Windows weren’t worried at all. There was no collapse & they were also able to install double glazing of the fan light while other companies said this wouldn’t be possible. I STRONGLY recommend this company above ALL others. I’m going to get them back to do 1 more window too. They were very nice to deal with & their employees were very conscientious, careful, helpful yet also worked amazingly fast. They covered carpets & put up plastic to prevent dust.

This is the third time I have called on Core Sash Windows to do work for us. The window in the kitchen needed to be replaced and I wanted shutters in the bay sash windows which were Core installed previously. I also asked if they would consider installing a half-glazed vestibule door which I ordered from a separate supplier and door fittings to match. I am so glad to have found this company over 10 years ago because they never fail to provide reliable, helpful and top-class work. The costings and scheduling are clear and delivered. The team who worked on the various projects were polite and took great pride in delivering high-end finishes so many thanks. I continue to sing your praises locally

I had a two wooden sash windows, French doors, a leaking pane on an existing window and the borrowed light above the front door replaced. Core were very efficient and easy to deal with whilst getting the job set up (arranging surveys etc.), got back with answers to questions and were very clear about what their service entailed. The window fitters and decorator were professional and worked to finish the job whilst I was away. They made a good effort at cleaning up too. Their service includes a decorator to make good on any damage to the window surrounds and ensure that the windows are fully decorated and don't require the customer to finish off. They even sourced matching paint for windows that were painted non-white. The one item of snagging was resolved quickly - I reported it on a Sunday evening via e-mail and they had a surveyor round by 1030 Monday morning, with the snagging resolved on the Friday. The products are good quality with attention paid to the security of the windows and doors they are fitting.

I value professionalism and service. A neighbour referred me to Core Sash Windows many years ago, but I also did my due diligence. I was impressed by the information and advice given to me during the quotation process, and they were very reasonably priced, given the high quality of the windows. Fast forward several years, I've had them back many times to replace various windows in my house where the old original sash windows had rotted away. I've also recommended to others. The teams of installers work like trojans. They are clear in explaining the installation process and are exceptionally clean and tidy. They also bring craft and art to how they work, which is important when you are trying to achieve a particular aesthetic in keeping with the period of the home, in my case, a Victorian terrace. The administration/support team updates you on installation timelines and quickly answers any questions. You get the sense that people have worked with Core Sash Windows for a while and like their workplace, which is essential to me. Their windows have totally transformed my house. While the window materials are exceptional, and the action of the window - the way it opens and closes - is wonderfully smooth and noiseless. It has transformed my home, and I recommend them without any caveats. Top marks

Virtually all Victorian sash and casement windows replaced with new double-glazed equivalents. The windows, as delivered, seem to be very high quality and the installation work, which could have been very disruptive, was carried out very efficiently and with maximum consideration for our having rooms to live in. The team were a pleasure to deal with. They cleaned as they went on and helped put back the curtain rails and curtains, not only helping me but ensuring I did not damage up the new windows! The windows are not the cheapest but I don't think they could be faulted for quality or for finish.

We have had 7 windows replaced by Core Sash Windows, and are absolutely delighted with the work they have done for us. From our initial appointment with Ryan to the actual work days with the window installer (Irmis) and the painter (Andrew), everything has gone smoothly without a hitch. The quality and cleanliness of the work, as well as their professionalism exceeded our expectations. We would warmly recommend them!

I live in a listed building so our design constraints are very tight. I'm very pleased with the service and the product. Incredible work from the whole team! Some mistakes were done at the start but what really matters is how well they dealt with it. It's an honest business that cares about their customers. I'll surely be using their services again.

Had new French Doors installed and the fitters were efficient, took great care to isolate disruption and cleaned up perfectly. The decorator who came the next day was meticulous and again left no mess at all. Not all companies will make good and redecorate around their work like this.

Tim and the team were professional, efficient and responsive. They were flexible with our schedule and we very really impressed with the quality of their work. Highly recommended.