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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 1872, Cortizo are leaders in the manufacture and design of aluminium windows and doors. Their Aluminium Windows are suitable for any room in your home, from kitchen to living room to bathroom amd are engineered with a strong aluminum frame. Cortizo windows operate on a minimalist, easy-to-use system specially suitable for large dimensions and maximum natural light.

With a choice of glazing finishes and stainless steel frames reinforcing the glass, the aesthetics of Cortizo are second to none. Designed with a maximum surface glazing area to create light and space, these bespoke slimline aluminium windows are also designed for total noise insulation as well as being energy efficient with thermal insulation.

Cortizo are experts in minimalistic excellence and maximum luminosity. With company values of Investigation, Adaptability and Rigor, each product is designed to increase property value with their initiative 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 floods your property, turning a house into a home. 

Sustainability and eco-efficiency is also key to their business model. Cortizo use reusable material with more than 2,400 aluminium waste collection points in Europe.

Cortizo logo

Cortizo Window Planning & Installation – Klosen


Whether your property is in Peterborough, Stamford, Bourne or the surrounding areas, invite a touch of minimalism into your home. With a sophisticated multi point locking system, you’ll benefit from increased security and luxury design in your UK based property.

Still have questions? Get in touch with our friendly team today.

Cortizo Windows Featured on Grand Design


In January 2021, Cortizo windows and doors were featured in a Grand Design project for a South Lincolnshire-based couple who wanted a sleek, contemporary feel to their Dutch barn house.

They wanted to invest in the best insulated windows and doors, and opted for Cortizo Casement window and Cortizo Millennium Plus Door, both made with high-quality aluminium.

If you are interested in Cortizo aluminium windows or doors 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