A zero-carbon home which borrows from a building style first used more than 600 years ago has been unveiled in Kent.
According to its designers the large arch provides "great thermal mass, enabling the building to retain heat, absorb fluctuations in temperature and reduce the need for central heating or cooling systems".
The house gets much of its energy from solar panels, has triple-glazed windows and insulation made from recycled newspaper.
The earliest known example of the "timbrel vaulting" technique, which uses thin bricks to create lightweight and durable buildings, was in Valencia in 1382.
Richard Hawkes said: "The building demonstrates how contemporary design can celebrate local materials and integrate new technologies to produce a highly sustainable building that sits lightly on the Earth."