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The Orchard - Hempcrete House,

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Individual Self-Build in Alvechurch South

completed: 2025


About this home:

This timber frame house utilises a double-stud structure with hempcrete infill to form monolithic, breathable, fire retardant, carbon negative, non-toxic and highly insulated walls. Construction is incredibly quick and simple, and can be easily taught to volunteers. Services run through the walls and the ceiling service void. MVHR will be used to distribute heat from the woodburner through the house and provide fresh warm air. 5.4 tonnes of hemp in the walls store twice as much carbon as timber. Walls are thick and sturdy creating a peaceful interior reminiscent of a stone building. Internal finishes of clay-lime plaster, tadelakt, oak door and window frames and a tiled floor will transform this building site into a beautiful modern home.


Features:

Individual Self-Build icon

Individual Self-Build

Timber Frame icon

Timber Frame

Clay Render / Plaster icon

Clay Render / Plaster

Hemp Insulation icon

Hemp Insulation

MVHR icon

MVHR

Solar Panels icon

Solar Panels

Officer Delegated Decision icon

Officer Delegated Decision

Building close to trees icon

Building close to trees

Challenging Access icon

Challenging Access

Innovative Construction Techniques icon

Innovative Construction Techniques

Airtight Design icon

Airtight Design

Landscape House icon

Landscape House

Low Cost Construction icon

Low Cost Construction

Off-Grid icon

Off-Grid


Planning Insights:

12 months at planning

Since the site had agricultural buildings, they initially applied for Class Q, but that was rejected and they were asked to apply for planning. Planning was granted on a material change of use but since they knocked most of the derelict buildings down they are in contravention, with planners claiming it as an operational development. The footprint has been kept the same and existing concrete slabs have been reused. They are confident this can be resolved.


Project Challenges

Minimising embodied carbon

Hemp is a carbon negative material. The only concrete in the building is in the slabs, half of which has been reused. There is no steel in the construction.

Replacing existing agricultural buildings

The 300mm walls reduce the size of the rooms inside but this makes getting planning more likely. The property had no mains water so they installed a 70m borehole which provides fresh water.

Building Regulations - Hempcrete

By over-engineering the structure any inspector can see that the building is safe. Internal clay-lime plaster, weatherproof membranes and timber cladding on the exterior protect the walls.

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