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Cortizo Windows

Klosen / Aluminium Windows / Cortizo Windows

Cortizo – Aluminium Windows

Leading the manufacture and design of aluminium profiles through innovation and strong investment since 1972.

Download Cortizo Brouchure

A Spanish firm established in 1972, Cortizo are leaders in the manufacture and design of aluminium windows. Their Aluminium Windows are suitable for any room in your home, from the kitchen and living room to your bedrooms and bathrooms. Cortizo windows operate on a minimalist, easy-to-use system specially suitable for large dimensions to optimise natural light exposure. Engineered with a strong aluminium frame they are built to last.

With a choice of glazing finishes and stainless steel frames to reinforce the glass, the aesthetics of Cortizo are second to none. Designed with a maximum window surface area to create light and space, these bespoke slimline aluminium windows are also designed with enhanced noise insulation as well as offering improved levels of energy efficiency and thermal insulation.

Cortizo are experts in minimalistic excellence and maximum luminosity. With company values of investigation, adaptability and rigour, each product is designed to increase property value with their innovative and luxurious style and function.

Cortizo Windows are made of high quality materials and offer a range of finishes to suit any project, from beautiful houses to industrial offices. Cortizo Windows offer outstanding thermal and acoustic performance, and focus their design on functionality for the home.

Their stylish and sleek design works with the elements to ensure as much natural light as possible, turning your house into a home. Sustainability and eco-efficiency is also key to their business model. Cortizo uses reusable material from over 2,400 aluminium waste collection points in Europe.

As well as supplying a wide range of aluminium window designs, Cortizo also supply elegant sliding and bi-fold doors.

Cortizo logo

Cortizo Window Planning & Installation – Klosen


Whether your property is in Peterborough, Stamford, Bourne or the surrounding areas, Klosen can help bring a touch of minimalism into your home with our Cortizo window planning and installation service. With a sophisticated multi-point locking system, you’ll benefit from increased security and luxury design in your UK based property. Get in touch with our friendly team today to discuss your design plans.

Cortizo Windows Featured on Grand Designs


In January 2021, Cortizo windows were featured in a Grand Designs project based in South Lincolnshire. The couple-team wanted a sleek, contemporary feel to their Dutch barn house.

They wanted to invest in the best insulated windows and doors, and opted for the Cortizo Casement Window engineered with high-quality aluminium.

If you are interested in Cortizo aluminium windows for your home project, contact us today.

gravel driveway to new Dutch barn building

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

Frequently Asked Questions

What frame finishes do Cortizo offer?

Frame finishes include anodizing or powder coating, both designed to protect your aluminium from the elements. Opening accessories include a range of handles, multi-point locking systems, and even an invisible opening mechanism which provides the ultimate minimalist aesthetic. With a choice of sliding, side hung, and turn and tilt opening mechanisms you can choose windows that work for your space.

Are Cortizo windows suitable for private and commercial properties?

Yes, Cortizo windows are perfectly suited to both private homes and commercial spaces. We regularly work with architects, homeowners and businesses to provide the perfect aluminium window designs that seamlessly work with your interior and exterior design.