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.

Experience healthier living spaces with improved air quality and chemical-free environments.

Choose Hemp Blocks for sustainable construction. 🌱💚

Please contact us for more information and a quote.

Will has been building with natural materials for the past 15 years, co-author of The Hempcrete Book .

Lately, Will’s passion for natural building has focussed on earth in construction and he was instrumental in the design and construction of the earth-domed children’s nursery at HG Matthews in Bellingdon built with a combination of structural earth blocks and insulating hempcrete.

Will also designs, produces and supplies clay plasters and clay plaster ingredients and has begun adapting standard construction machinery for processing and applying site soils.

Using spray machines to spray light hemp earth insulation. Using mobile roller pan mixers to process earth faster on building sites. Using pre-dried blocks to build earth structures faster. He will be covering both new build and renovation.

You can view the event details and book here

Very pleased that The Hemp Block Company supplied the Hemp Blocks to MCS Construction for the wall structures of this fantastic school development.

So, helping pave the way for established general building contractors and architects to use and specify Hempcrete Blocks in public and private developments.

See the video and read more HERE.