Green Building Store is now 21°

About us

Since 1995, we’ve been supplying a range of specialist products and services including triple glazed windows and doors, MVHR heat recovery ventilation and airtightness products.

About us

We’re the sustainable building pioneers, supplying a range of specialist products and services for Passivhaus and low energy projects, since 1995.

21° is committed to low energy building to help reduce carbon emissions and cut heating bills. The most effective way of doing this is to focus on the building fabric, using high levels of continuous insulation, together with stringent airtightness and advanced ventilation strategies. This approach leads us to be strong proponents of the Passivhaus approach to low energy building, which can cut a building’s heating need by up to 90%, compared with typical uninsulated UK housing stock.

As well as reducing energy bills and CO2 emissions, low energy and Passivhaus homes and buildings can improve the quality of life for occupants. Constant warm and even temperatures, eradication of mould and condensation issues, and elimination of cold spots or draughts can really make our homes and buildings more comfortable and enjoyable places to be.

By developing expertise in Passivhaus products, 21° hopes to facilitate the construction of Passivhaus buildings in the UK and to promote current ‘best practice’ in low carbon construction.

Our products

We offer a wide range of products, including triple-glazed timber & alu-clad windows and doors advanced MVHR heat recovery ventilation, specialist airtightness & insulation products.

Certified and quality tested

All of our products are thoroughly tested and quality assured.

FSC Certified Wood

Part Q Complient

Secured by design

Why choose 21°?

25 years’ trusted experience

Highest quality service

Comprehensive range of products

Confidence on quality

Friendly & knowledgeable team

No sub-contractors

21°’s actions and achievements have not only delivered cutting edge sustainable products to the market, but in so doing have progressed the nature of this market place itself.

The Queen’s Awards for Enterprise: Sustainable Development 2009

Discover how it all began for 21°

Find out more about who we are, why thermal efficiency was a major priority from the start and why we switched to triple glazing as standard and began to supply a wide range of Passivhaus products.

Read our background

Read more about us

Meet the team

Get to know the 21° team, where we are all united by passion and purpose. Our collaborative spirit delivers outstanding results.

Join us

See our latest vacancies and develop your career by bringing about positive change and joining a business with purpose.

Awards & accolades

We’ve received a number of prestigious awards and accolades for our work over the last 25 years.

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Life changing homes