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Klosen – Slimline Aluminium Windows

Elegant and luxurious slimline windows are engineered with purpose to create a stylish, modern and sophisticated entrance way to your home. Aluminium framed sliding doors open up space and flood your property with natural light.

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.

Key Features & Benefits

Thermal Insulation

The material has built-in thermal properties which will improve heat insulation for your home.

Natural Light

A thin frame and maximized glass will enable a source of natural light into your home, making your rooms brighter.

Aesthetic Design

The slimline range will integrate a beautiful aesthetic with traditional surroundings that will make your home contemporary.

Strong & Seamless

Aluminum is a strong & lightweight material which will allow a smooth but sturdy function.


Slimline Windows utilise sleek frames that imitate the look and feel of original steel windows. They offer complete or partial glazing without the need to modify the nature of the property – our windows become a part of your home.

Sitting comfortably with the contemporary lifestyle, our slimline windows bring uniqueness to your home. With minimal framing, our slimline windows can transform your sanctuary by inviting in more natural light and turning a good view into a fantastic one.


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Our slimline windows offer inherent durability. Their stunning thin frames are no compromise to the strength offered making them ideal for your home and other architectural projects.

By investing in our slimline windows you face minimal maintenance to prolong the lifespan of your windows. The minimal structure sits harmoniously within your home, creating a haven of spaciousness. Slimline windows will revolutionise the way you see your property.

Types of Slimline Windows we Offer

If you are sure about opting for a slimline window in your home, we also offer slimline sliding doors. These are designed as part of the collection and will provide the finishing touch to your home. Both are designed to be effortless and we work with a variety of brands to bring you the best aluminium doors on the market.

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Get in touch with us today to receive your free quotation!