Despite common misunderstanding, our Hempblocks can be used alongside conventional building materials in retrofit projects.

Hempcrete helps improve:

Which can significantly improve the performance of existing buildings.

As the UK pushes toward lower carbon construction, materials like hempcrete blocks offer a practical retrofit solution that supports both sustainability and healthier indoor environments.

Interested in exploring our Hempblocks for your next project?

Please get in touch — we’d be happy to help.

Recent projects demonstrate these blocks can be installed on lime mortar over insulation, providing superior thermal performance and a healthy, natural surface.

To order, please call The Hemp Block Company at 01923 920449. Or email info@hempblock.co.uk.

 We’re proud to share that Neil’s presentation — and our hemp building blocks — were warmly received by the audience. The session sparked thoughtful questions, lively discussion, and some fantastic feedback from architects and designers interested in low-carbon, natural building solutions.

 Moments like this highlight what makes the Hemp Block Company so special: a commitment to forward-thinking construction, genuinely sustainable materials, and a passion for helping shape a healthier built environment. 

Improved Thermal Efficiency, Independently Verified

Independent testing, confirmed by our partners at Senini, has shown that our hemp blocks now achieve an impressive thermal conductivity of 0.044 W/m·K.

This enhanced performance means that builders, architects, and homeowners can now enjoy better insulation from a thinner wall — reducing both material use and overall construction costs. In other words, less really is more.

Why ‘Less’ Means More for Your Building Project

• Lower build costs & reduced embodied carbon through the use of less raw material
• Thinner wall construction, freeing up valuable internal floor space
• Superior insulation performance, reducing energy use and improving comfort all year round

This breakthrough reinforces The Hemp Block Company’s position as a UK leader in eco-friendly, high-performance hempcrete block supply — allowing low-impact building solutions that don’t compromise on quality or sustainability.

Please click on the graphic below for the bilingual report. 

This versatile, natural material aligns perfectly with Boasts commitment to sustainable design, offering significant advantages in carbon reduction and energy efficiency.

Boast Architects continue to innovate in residential and bespoke architecture and are excited about the potential of hempcrete to foster healthier living environments and contribute to a greener built environment.

Read more on this development here.

However, our excitement turned to disappointed when we saw the detail that the VAT is only being removed on the installation and not on the supply.

With this in mind, we would like to step up where the Government have fallen short and pay 50% of the VAT on any orders made before the end of June*.

*This offer applies to self-builders who are unable to reclaim the VAT as part of their build.

If you want to know more about our products, please contact us to discuss your development and sustainability requirements.