A Leading Designer of Frameless Aluminum Window & Door Systems

A Company with Vision

Keller minimal windows® is a leading global designer and manufacturer of innovative, high-end and virtually frameless aluminum window and door systems. Fifteen years’ experience in the luxury segment has been pivotal to our success. We develop custom-made solutions that bring architectural visions around the globe to life. Our quest is to create perfection, meeting the most extreme and ambitious specifications. We aspire to cross architectural boundaries, while still providing reliable, long-term functionality.

    Global Reach with that Personal Touch

    Although we provide a global service, we strongly believe that the personal touch is central to success. To do this, we have retained the flexibility of a small company.  All of our products are individually designed and manufactured in our production facility in Luxembourg, right in the heart of Europe. The assembly is carried out by our exclusive network of trained and qualified partners on multiple continents.

    The dedicated Keller minimal windows® product team is committed to understanding both your requirements and your vision. We always deliver bespoke solutions, perfectly aligned to your projects and the markets you serve.

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    Continuous Innovation

    Ever since we developed our first high-end and virtually frameless aluminum minimal windows® system in 2007, Keller minimal windows® has never ceased to innovate and continues to develop solutions that respond to ever-changing market trends and demands.

    Our commitment to ongoing R&D has helped us create many innovative solutions, which respond to both environmental and legal requirements. One of the outcomes of such innovation is our triple-glazing solution. We have also been instrumental in the evolution of design trends:

    Our triple-glazed sliding system for low-energy requirements and standards

    Our innovative premium glass facade system

    We developed this solution to create a flowing, obstacle-free transition between interior and exterior space

    Our pivot door opens up your space to the maximum, taking full advantage of available light

    Our curved sliding door solution offers maximum flexibility, as it can be integrated into any modern architectural design or shape

    Keller minimal windows® at a Glance

    • Headquarters and production facility located in Luxembourg
    • A team of 45+ international specialists working in close collaboration
    • A presence in 35 countries worldwide, due to our select partnerships
    • 15 years’ experience in the design, manufacture and distribution of minimal aluminum window systems
    • A total of 5,000 minimal windows® installed
    Villa wallis Stephan Offermann minimal windows 4+

    A member of the AluK Group

    Keller minimal windows® has been a member of the AluK group since 2020. AluK is a global leader in the design, engineering, and distribution of aluminum windows, doors, and facades. As an internationally-operating and experienced professional aluminum building systems manufacturer, it still retains the positive qualities of a proudly-owned family business.  It combines expert knowledge and business experience with strong financial back-up.

    Would you like to know more about the AluK group?

    Go to aluk.com

    Our History

    Keller minimal windows® has 15 years’ experience as a global player. We have gained a great deal of international recognition over the years by launching ground-breaking products and executing exceptional projects across the globe. This journey could not have been made without our passionate, highly- qualified partners and our dedicated team.


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