Box Clever Sash Windows

"We are very pleased with the windows, they look fabulous!. The guys were great to have in the house and worked really hard."

Ms M, Hampshire, Jan 2025

"Box Clever were responsive, reliable and expert. The whole process from quotation to installation was easy and we are delighted with the high quality windows."

Ms M, Oxford, Dec 2024

"Excellent service from start to finish. Questions answered quickly. Fitting the windows went smoothly and the young men were professional and kept everything as clean as possible. Very good company which I would highly recommend."

Ms M, Hampshire, Nov 2024

"Amazing, friendly, professional service from start to finish. Installed two large Masterframe Bygone range sash windows. Lovely, honest and highly experienced family business who explained the whole process and couldn’t be nicer to deal with. I love my new windows!"

Ms J, Bucks, Aug 2024

"Thanks to everyone for fantastic service, installation & communication – very happy I chose Box Clever."

Mrs H, Hampshire, July 2024

"We wanted to say how delighted we are with our new sash windows. They look absolutely fantastic and we could not be happier. Thanks also to the guys who did the fitting, they were fantastic."

Mrs S, Hampshire, June 2024

See all our Testimonials

Hi. Welcome to Box Clever.

Tony Wybrow, Managing Director of Box Clever Sash Windows My name is Tony Wybrow and for the past 24 years I have been dedicated to sliding sash and period style windows and doors - installing the finest quality products available - with an absolute passion for their design, elegance and quintessentially English style.

During that time there have been huge developments in the design, quality and performance of the frames available –the woodfinish PVCu ‘timber alternative’ ranges have made major advances in style and detailing meaning that they are now commonly accepted in Conservation Areas whilst there has been a big shift to high performance Engineered timber products that don’t ‘cost the Earth’.

As a family run company, here at Box Clever, we have assembled a professional and knowledgeable team - from offering honest, tailored advice on product options, to our experienced, specialist installers - approachable, efficient and taking great pride in their work.

Have a look at our gallery to see the size and diversity of projects we’ve been involved with and see some of the comments our customers have sent us.

I look forward to hearing from you to see if we can help with your project.

Tony Wybrow
Director

PS: Feel free to call us on 0800 292 2968 for a no obligation conversation.

"Really happy with our new windows. Thank you!"

Mrs S, Oxford, Jan 2026

"Once again, Lewis, Simon and Matthew were brilliant. Friendly, professional and they did a great job - a pleasure to deal with everyone involved. "

Ms W, West London, Feb 2026

"Excellent service and product - excellent communication right from the start, came when they said and provided all the information needed. Having experienced some terrible cowboys trying to sell windows, it was great to deal with such a professional family business who pride themselves for the service they provide. Highly recommended!"

Mr S, Oxford, Jan 2026

"This is a very professional company; excellent communication throughout, and we are very happy with the installation of all 13 windows. We would not hesitate to recommend them to others."

Mrs M, West London, January 2026

"We ordered a great quality window from Box Clever which was made bespoke for our loft conversion. The Box Clever team were brilliant from start to finish. Highly recommend!"

Mr H, West London, Jan 2026

"The whole operation at Box Clever is extremely professional and the quality of work and products is outstanding. I had all of the windows (and a couple of doors) in my Victorian semi replaced and the project went very smoothly from initial enquiry, through survey and quote to installation. The site team are very polite and hardworking and take great care in everything they do. Highly recommended."

Mrs H, Berkshire, December 2025

"Family run company that delivers a first class service. Their support and understand working with me to fit new windows at my elderly relatives house was seamless. Living 3 hours away I needed a company I could trust to do exactly what had been agreed especially when it came to timing of the works. This was executed without fault hence the glowing review."

Mr B, Hampshire, December 2025

"Great service and products."

Mr J, West London, December 2025

"Literally every person I dealt with in this company was friendly, polite and helpful. It wasn’t the cheapest quote, but I am very happy with my new window and the quality is excellent."

Mrs M, Berkshire, December 2025

"I am very pleased with the two bathroom windows you installed for me last month. Thank you for such great customer service, at every stage."

Ms W, West London, December 2025

"Please thank your installers, they did an excellent job and were nice people to have around. In fact everyone we have dealt with has been really helpful. "

Ms M, Berkshire, December 2025

"I just wanted to take a moment to let you know that all the three guys that fitted the windows were a credit to your company. Everything was left so clean and tidy when offsite and at the end the house looked cleaner than before you arrived."

Mr & Mrs O, Hampshire, September 2025

"Thanks to the team for the installation last week - it’s looking great"

Mr S, Hampshire, August 2025

"The guys finished the window and did a lovely job this morning. Thankyou all. It looks really great and matches our originals beautifully."

Mrs A, Berkshire, July 2025

" I have to say that your company was great to deal with when we had the windows installed and that, 8 years later, you’re still happy to help is a real testament. "

Mr N, West London, July 2025

"Box Clever Sash have supplied and fitted six Master Frame sash windows over a ten year period - the sixth one this week I cannot recommend the service or the product highly enough. Windows are top quality - the pair that we have had for 10 years are still perfect. The company are great to deal with. All workmanship is to an extremely high standard. This includes carefully chosen and fitted internal wood joinery (architrave, sills etc) which is all replaced with like for like so again completely in keeping with the period of the house. Highly recommend!"

Mrs D, West London, July 2025

" I am thrilled with our windows, they are beautiful. They have done a really great job with creating our vision."

Mr & Mrs J, Hampshire, June 2025

"We were so pleased with all the work and the way it was done, the thoughtfulness and care taken by everyone involved that a recommendation was easy. "

Mr & Mrs F, London, June 2025

"We had 6 wooden sash windows removed and replaced. Great customer service and communication throughout. The new windows are excellent quality and fitted superbly. Excellent attention to detail, providing matching paint for the architrave. The aftercare has been very good, we had a couple of minor snagging issues which were promptly resolved."

Ms R, Berkshire, June 2025

"Amazing, family-run, sash window company. They have installed 5 windows across 3 different visits for me and every time the service and quality of installation and joinery has been second to none. Would highly recommend for any sash window replacements/fittings in SW London."

Ms C, London, April 2025