Low-energy building design

The knowledge and technology to create high performance homes, all in one place.
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Full-circle, low energy home design solutions

Architects are increasingly challenged to meet the demands of both energy efficiency and aesthetic excellence in their designs. At 21 Degrees, we offer bespoke, full-circle solutions tailored to the specific needs of architects, delivering on both fronts.

We believe in creating integrated systems where technologies like heat pumps, high performance windows and doors, airtightness and MVHR systems work together seamlessly to maximise energy efficiency.  

We’re with you at every step, from initial design concepts to final installation and commissioning. Whether you're designing a luxury residence or a cutting edge office space, we ensure your building operates efficiently, comfortably, and sustainably.​ 

The benefits of full-circle sustainable solutions

Tailored design services

We want you to achieve the best you can within the scope of your objectives and resources, which is why we offer design services for Passivhaus, low-energy building design, mechanical ventilation with heat recovery (MVHR) design, and more.

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In-house expertise

We don’t subcontract – our skilled, in house experts handle every aspect of the installation process, ensuring quality control at every stage.

Cutting edge technologies

We stay at the forefront of energy-efficient technologies – helping architects incorporate innovative high performance, low energy home design solutions – that meet both client and regulatory requirements.

Specify us with NBS

Technical details for our high performance windows and doors are available through NBS source – the innovative platform that brings together the NBS BIM Library, NBS Plus, and Product Selector. ​

Download our technical information

Technical drawings and PHPP ready data is available for our range of high performance windows and doors.

Seeking inspiration?

Case studies

Delivering success with sustainable design

Our case studies showcase the tangible benefits of integrating smart technologies into low-energy building designs.​


Explore our case studies to see how we’ve supported architects in creating some of the UK’s most energy-efficient homes, or get in touch to learn how we can help in your next project.​

Partner with 21 Degrees for sustainable design excellence

Join the architects and specifiers who trust 21 Degrees to help them redefine energy-efficient house design and commercial property solutions. With our expertise, you'll create spaces that not only meet regulatory requirements but also set new benchmarks for comfort, health, and sustainability.

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Change the way you think about energy