Keystone Supplies, Unit 17 Storforth Lane Trading Estate, Hasland, Chesterfield, Derbyshire, United Kingdom S41 0QQ
01246 201523‬
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Passive House Windows and Doors

Welcome to Keystone Specialist Glazing Systems, your premier destination for Passive House accredited windows and doors in the UK. We are proud to offer industry-leading solutions from Cortizo and Rationel, specifically designed to meet the rigorous standards of Passive House construction.

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Cortizo: Passive House Accredited Windows

Our range of Cortizo Passive House accredited windows combines cutting-edge technology with exceptional performance. Engineered to the highest standards, these windows are designed to maximize energy efficiency and comfort while minimizing environmental impact. With advanced thermal insulation and airtight construction, Cortizo Passive House windows ensure optimal indoor climate control, reducing heating and cooling costs year-round.


Rationel: Fully Compliant Windows

In addition to our Cortizo range, we also offer fully compliant Passive House windows from Rationel. Renowned for their precision engineering and Scandinavian design, Rationel windows meet the strict criteria for Passive House certification. Featuring triple glazing, low U-values, and superior airtightness, Rationel windows deliver outstanding thermal performance and comfort, making them an ideal choice for energy-efficient buildings.

Why Choose Passive House Windows and Doors from Keystone?

  • Energy Efficiency: Our Passive House windows and doors are designed to significantly reduce energy consumption and carbon emissions, helping you create a more sustainable and environmentally friendly building.
  • Comfort: Experience superior indoor comfort with optimal temperature regulation and noise reduction provided by our Passive House accredited windows and doors.
  • Quality Assurance: With accreditation from reputable organizations and adherence to strict industry standards, you can trust that our Passive House windows and doors meet the highest levels of quality and performance.
  • Customization: Choose from a variety of styles, finishes, and configurations to suit your design preferences and project requirements. Our expert team will work with you to find the perfect Passive House solution for your building.
Transform your space with Passive House windows and doors from Keystone Specialist Glazing Systems. Contact us today to learn more about our products and services, and let us help you achieve your energy efficiency goals.


Got a question you want answered?

If you have any questions or would like to know more please use the contact form below to get in touch with Keystone.