Few people can afford to spend £800,000 on a house, even one that’s going to start paying for itself with the electricity it generates. Architect Richard Hawkes did, and the result is stunning. The timberal roofing is a modern take on an old technique, and will be planted for added insulation. Heat will be stored during the day to be released when it cools, a simple idea made more efficient with new materials.

Few of the technologies Hawkes uses could be affordable to the average housebuilder, but the principles can be adapted for the lower end of the market.

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