21° (formerly Green Building Store) provide a range of products and support for Passivhaus & low energy homes and buildings.
As pioneers in the industry we’ve worked hard to build a reputation for customer service, integrity and responsibility. We are committed to ensuring that our products are of the highest quality, backed by industry accreditations, and specified by companies at the forefront of energy-efficient construction.
Green Building Store was founded in 1995 by three experienced building professionals frustrated with the poor availability of ecological building products. Rebranded to 21° in March 2024 the new brand reflects our aspiration to facilitate the construction of Passivhaus buildings in the UK and promote current 'best practice' in low carbon construction.
We also have a huge library of free resources on our website including films and technical briefings on a wide range of Passivhaus and deep retrofit projects.