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Slimline Sliding Doors


Klosen / Slimline / Sliding Doors


Slimline sliding doors are an alternative to the traditional patio door. The strong, slim aluminium frames are designed to support large panels of glass for better views and a contemporary design.

What are slimline sliding doors?

Within the door leaf, the integral rollers allow the glass to glide open in a smooth, consistent movement. The frames are discreet to ensure optimum exposure to natural light and a flawless floor-ceiling appearance.

Klosen is a trusted name that has been working with industry experts for the last 25 years.

Our experience has given us an affinity in providing beautifully designed, high-quality products that have the power to transform properties into modern spaces. Creating a contemporary feel in your home or commercial property is easy with our choice of aluminium framed sliding doors.

Combining a robust, secure and well-insulated structure with luxurious style and innovation, we provide every customer with our personal guarantee that covers both the supply and installation of all our slimline sliding doors.

Installing these into your home can drive up property value as well; a benefit that is often overlooked by homeowners.

Request A Quotation Who We Work With

Our Customer Reviews

Great Price & Quick Delivery

This company have been amazing and came to our rescue when another company let us down repeatedly over a period of 4 months during our building work. We got a great price, a quick delivery time and the same product but this time with lovely fitters who knew exactly what they were doing. Now we will will have a warm house for christmas HOORAY !! We went for 3 large sliding doors and the quality of the product is excellent . Many thanks to Audrey Cieran and the team I would recommend highly
- Esther Young


Delighted with the product and the service provided by Klosen. The installation team were excellent and very helpful.
- Sara Hyem

Very Happy

We’ve been very happy with the work Klosen recently completed for us. They installed a variety of windows and sliding doors for us on our new build project. All of the information we requested early on was provided promptly and they were great with our architect. Very happy with the end result and the colour they helped us chose.
- Sarah Munton


From initial design and planning, right through to the execution, our customer team and dedicated craftsmen provide an outstanding level of service. Throughout the whole process, we ensure our customers are 100% happy with the development of the project and will keep you informed of progress.

We understand that the premium cost of a slimline sliding door means customers expect a flawless product. That’s why we only supply the highest-quality aluminium door brands, including the likes of Cortizo and Senior Architectural Systems.

We have worked on multiple projects around the country to install our high-quality windows and doors to enhance modern aesthetics and to increase productivity. Our recent project based in Skidby, Yorkshire, ensured that the property’s character was defined by its slimline aesthetics. Our aluminium frames not only offered great views and added to the modern elegance.

Equally, we worked on Tow Top, Cumbria, and used Cortizo doors to enhance energy efficiency, improving the overall aesthetics of the property.

Adding these to your home can increase property value as well as make it a happier and more practical place to call home.

Cortizo Slimline Sliding Door

Who We Work With

Cortizo logo
Senior Architechtural Systems Logo


Cortizo specialises in creating avant-garde and thermally efficient sliding door systems that permits maximum luminosity with minimal aluminium profiles.

Cor-vision sliding system

From your patios to your terrace or balcony, with 100% opening surface capability the Cor-vision sliding door system helps you to maximise views and luminosity all whilst making the most of your indoor and outdoor spaces. Frame fragments only take up between 9 – 14% of the total surface. Choose from a range of powder coating finishes in a range of colours.

Cor-vision plus sliding system

Specially suited to larger properties, including commercial spaces, the Cor-vision Plus Sliding System offers maximum luminosity with a glass surface of up to 94%. Available with configurations of fixed and sash, and maximum dimensions of 4.000 mm/sash width, there is plenty of opportunity to create a sliding door system that works seamlessly with your space.

We have installed many Cortizo windows and doors to multiple properties to combine a sophisticated look with updated features. For example, in the Spinney, Deeping Gate in Lincolnshire, we installed a Cortizo Vision Plus sliding door to achieve efficient thermal insulation with minimal slightlines. These high performing doors provided a bright and modern living space that met the needs of the client. As well as that, we have worked on many other projects to maximise productive living spaces whilst achieving a modern appeal.

Cortizo Specifications

U Value: Uw ≥ 1.3 (W/m²K)

Acoustic insulation: Rw up to 41 dB

Air permeability: Class 4

Water tightness: Class 7A

Wind resistance: Class C5

Central Interlock Sightlines: 110mm

Polyamide Strip Length: 16/24 mm

Glazing: Max 30 mm, Min 26 mm

Maximum Sash Dimensions: Width (L) 2500 mm, Height (H) 3000 mm

Maximum Sash Weight: 320 Kg

Transmittance: Uw ≥ 0.9 (W/m²K) 

Acoustic Insulation: Rw up to 43 dB

Air Permeability: Class 4

Water Tightness: Class 7A*/9A**

Wind Resistance: Class C3*/C4**


Frame 180 mm/278 mm 3 rails

Sash 69 mm

Polyamide Strip length: 

Frame 40 mm

Sash 18 / 32 mm

Profile Thickness: 

Door 2.0 mm


Max. 54 mm, Min. 36mm

Maximum Sash Dimensions:

Width (L) 4000 mm, Height (H) 4000 mm

Maximum Sash Weight: 

400 kg Manual

700 kg Motorized

Senior Architectural Systems

Senior Architectural Systems offers a range of premium aluminium sliding door frames with impressive levels of thermal performance. Suitable for both residential and commercial properties, all the PURe sliding door designs come with elegant slimline frames available in a range of finishes including the standard RAL 9910 and RAL 7016 colours.

PURe Slide inline sliding door system

Offering full flexibility with heights of up to 3000mm, the PURe Slide inline sliding door system is perfect as a residential patio door. This robust design can take leaf weights of up to 160Kg and with a 40+ years life expectancy, as standard with the PURe door designs you can future-proof your property.

With high levels of thermal enhancement, these doors are a great option to cut down costs on energy bills. The precision engineering offers an effortless glide, helping you to seamlessly connect your indoor living spaces with your outdoor patio and garden spaces.

PURe Slide lift & slide door system

The PURe Slide life and slide door system offers a sturdy design that can take leaf weights up to 200Kg for standard lift and slide, and 300Kg for heavy duty lift and slide. Suitable for heights of up to 3000mm, this design offers flexible options that works for both commercial and residential properties.

Senior Architectural System Brochure
open sliding doors to patio with palm tree and outdoor furniture

10 Year Guarantee

We offer a 10 year guarantee on all aluminium profiles and 25 years for the powder coating element

Thermal Efficiency

Stay warm in the winter and cool in the summer whilst cutting down on energy bills

Complete Flexibility

Our team are flexible throughout the entire process, including the design and installation of windows

25+ Years Experience

Klosen have over 25 years experience working with designers, architects and homeowners

Where We Work

Based in Market Deeping in Lincolnshire, we typically cover areas across a 60 miles radius from our premises, including Peterborough, Cambridgeshire, Lincolnshire and the surrounding areas.

If you have your heart set on slimline aluminium sliding doors for your building or renovation project, we’re more than happy to discuss your design tastes and specifications. To find out more about the products and brands we supply, simply download our informative brochure. To enquire about any of our aluminium door designs and how they could enhance your property, get in touch with our friendly team today. We are happy to discuss all things related to our aluminium windows and doors.

You can also get slimline aluminium windows to go with your doors.


How secure are slimline sliding doors?

From premium-quality double glazing to secure locking systems, our doors are engineered with security in mind.

How much do slimline sliding doors cost?

The cost of aluminium slimline sliding doors depends on a range of considerations. But once we know the measurements, brand, style and finishes you require we can offer a no-obligation quote.

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