The first modern British home using mud has been built as part of a project to construct more energy-efficient homes.
Architect Anthony Hudson took an old construction method using mud and straw to build a bungalow that complies with modern building regulations.
The walls in the CobBauge home, in Fakenham, Norfolk are constructed from three simple ingredients: hemp straw, water and earth – or mud – known as Cob altogether.
The new technique allows the mud-built walls to be thermally insulated to modern standards.
The UK’s first domestic CobBauge building was built by local builders Grocott and Murfit last month (Jan) after a four year project by Hudson Architects.
A three-bedroom Cob home can be built for as little as £20,000 but the cost of Hudson Architect’s project is currently unknown.
Mud is one of the most sustainable construction materials with some Cob buildings dating back more than 500 years but were replaced in the 1800s for modern methods.
The house will also feature large, south-facing triple-glazed windows for solar gain in winter and an air source heat pump will provide heating.
It is part of an EU-funded project to bring mud construction into the 21st century with a focus on low carbon building as the first regulations-complaint cob building.
After the EU announced it was looking for architects to come up with new ways of using earth in houses, Mr Hudson, 68, leapt at the opportunity.
He said: “The challenge was to create a home using earth as the primary building material, but which could also be thermally insulated.
“Earth is a very sustainable way to build, especially because it’s so widely available here in the UK.
“The problem is that to make it an effective insulator you usually have to make the walls incredibly thick, which is impractical.”
Although there is still a way to go before mud houses can be put on the mainstream market, Mr Hudson is positive that the homes will become the new normal.
He said: “Although the materials are cheap and easy to source, the building method is very time-consuming. At the moment it all has to be done by hand, so labour costs run high. However, our next step is to figure out how we can refabricate buildings to cut that down. Once we’ve worked that out, my guess is this will be a very attractive method.”
Mr Hudson and his team decided to combine pure cob to create structural integrity and thermally insulated earth.
Its green roof will support biodiversity and make up for the loss of green space on the site.
An open day for the mud house in Fakenham, Norfolk will be held in March.
In 2011, Devon builder Kevin McCabe set out to create a 10,000sq ft home out of cob but the project was delayed due to problems such as bad weather.
When completed, the cob house cost nothing to heat but Mr McCabe admitted he had blown his original £350,000 budget and didn’t know how much his total was.
