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Want to browse more of our beautiful range? You can view our luxurious selection of front doors, sliding doors, bifolding doors and windows by simply entering your email address below, where you can then download a brochure of choice.

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Why Klosen for Doors and Windows?

Klosens mission is to provide an outstanding customer experience, backed with a premium quality of products.

Our customers choose us because they recognise our individuality, admire our designs, attention to detail and the service we deliver. From our contemporary factory and showroom in Market Deeping our team of skilled craftsmen manufacture bespoke products specific to the individual needs of our clients.

Excellent Quality & Quick Service

5 5 1
Klosen recently installed 3 sets of sliding doors on my extension and I found them to be superb from beginning to end. It was very helpful that they were knowledgeable of many of the systems available and were able to offer multiple products, as this helped me get a good quality product that was also competitive with other quotations I received. Would definitely use them again.

Happy & Would Recomend

5 5 1
Klosen installed some aluminium windows, sliding doors and a front door for ourselves recently. Very easy to deal with them all, and extremely happy with the products received and the installation quality. They offered a great range of products, not just one or two, which we found very important when making our decision on window & door supplier for this project. We would happily use again and recommend.


5 5 1
Having searched for along time for an installer of high quality aluminium windows I was very relieved when I found Klosen. They were excellent from beginning to end, with very knowledgeable staff.