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Aluminium Patio Doors

Aluminium Patio Doors

Klosen / Aluminium Windows / Aluminium Patio Doors

External view of timber slimline bifold doors
External night view of slimline sliding doors


Looking for a cutting-edge aluminium patio door for your home renovation or commercial building project?

With 25 years’ experience, we’ve installed aluminium windows and doors on luxury building renovations and projects. You can even find our work on Grand Designs and in the Abba arena in London. Could we transform your property too?

Working with leading brands from around the world, we provide choice and a bespoke service for our customers. We’ll ensure you’re 100% satisfied with the finished result.

We’ve completed countless installations across Cambridgeshire, Lincolnshire and London, with a 5-star reputation.

Contact us for a quote today. Or, take a look at our brochures.

Why Choose Aluminium Patio Doors

The perfect transition between your exterior and interior spaces, aluminium patio doors are an ideal choice for heritage and contemporary properties. Offering an up to 94% glazed surface and sleek floor-to-ceiling views, aluminium patio doors provide plenty of natural light.

With state-of-the-art insulation technology and secure locking mechanisms, you can keep your property secure while creating an environment that looks and feels comfortable. Keeping your energy bills down is also a fantastic reason to invest in an aluminium door.

Available with a wide range of colours, including stylish black and grey frames, these made-to-measure doors work for ground-floor extensions, renovations and ambitious new build projects. With a fully bespoke service, you can get the exact door you’ve been looking for.

A sustainable and hard-wearing material, our aluminium frames and finishes can easily last for up to 40 years and come with a 10 year guarantee.

Who We Work With Request A Quote

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

Who We Work With

Cortizo and Senior Architectural Systems are both pioneers in patio door designs and thermal efficiency. You’ll find fully bespoke sliding and bifold designs. There are plenty of frame colour customisations, sliding mechanisms, configurations and features to choose from, all of which are outlined in their brochures. You’ll also have a choice of double or triple glazing, depending on the level of insulation you require.

If you want to get started, give our friendly team a call or you can request a quote.

Cortizo logo
Senior Architechtural Systems Logo


Leading European manufacturers of aluminium patio doors. Their Cor Vision and Cor Vision Plus designs offer an innovatively stylish range of fully bespoke sliding and bifold patio doors. These doors not only provide exceptional durability and weather resistance but also an unparalleled aesthetic appeal. But the true beauty of these systems lies in their bespoke nature – each set of Cor Vision or Cor Vision Plus doors is made-to-measure, ensuring a flawless fit and optimal functionality within the designated opening. With their superior quality and sleek aesthetics.

Working on multiple projects across the country, we have improved many properties, such as our work in Meldreth in Cambridge. We installed quality aluminium frames, which enhanced the property’s ambience and practicality. It allowed for a more bright and welcoming property, soaking in the natural light from outside.

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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

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

Senior Architectural Systems

Manufacturing in Britain since 1991, Senior Architectural Systems offer market-leading thermal efficiency with U-values as low as 0.93 W/m2K. Their patented thermal barrier, featured on their PURe® doors, exceeds current building standards and makes your property ready for the future.

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Senior Architectural Systems Specifications

Max Door Leaf Width: 3005mm
Max Door Leaf Height: 2916mm
Max Outerframe Width: 6000mm to 11938mm
Max Outerframe Height: 3000mm

U-values: Less than 1.11 W/m2K

Max Weight Per Door Leaf: 160Kg – 300Kg

Glazing Thickness: 28mm – 52mm

Track Options: Single, double and triple

Weather Rating: Tested to BS6375-1, BS6375-2 and BS6375-3 Annex A

Security tested to PAS24: 2012

White house with large windows patio and furniture


This Dutch-barn inspired project features Cortizo casement windows installed by Klosen. As seen on Channel 4’s Grand Designs, the couple were delighted with the industrial chic appearance and the Klosen team are proud to have contributed to making their dream home a reality.

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Areas We Cover

Could we help make your grand property plans a reality? Our service regions include London, Lincolnshire, and Cambridgeshire. Typically, we operate in a 60-mile radius from our base in Market Deeping in Lincolnshire. Peterborough, Bourne, Stamford, and Huntingdon are among the places we frequently cover.

Why Choose Klosen?

  • Over 25 years of experience
  • Five-star reputation
  • 10 year guarantee on all work as standard
  • No project is too big or small
  • Experience working on high-profile projects, including a Grand Designs home and the ABBA Arena in London
Contact Us


How can we view your aluminium patio doors?

You can download our brochures, or you can head over to our showroom on the Northfields Industrial Estate in Market Deeping, Lincolnshire. For inspiration, check out our portfolio page.

What are the advantages of aluminium patio doors?

Not only are they elegantly designed, they also provide exceptional thermal and noise insulation performance and come with a range of colour finishes to suit your property design specs. They also maximise natural light and views with their slimline frames. Aluminium is robust, too, so you can experience a lifespan of 40 years or more, all with very little maintenance required.

What opening mechanisms can I choose from?

Working with several market-leading brands, we can offer plenty of choice for our customers, including on opening mechanisms and configurations. We have a fantastic selection of sliding and bi-fold designs to choose from.

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