You might not think it from the outside, but this four-story London home set on an eight-food-wide site has geothermal systems and a rainwater-harvesting system sufficient enough to flush all four toilets in the house and provide most of the home's water needs. All of the timber and steel used were sourced from sustainable sources, including the wood for the custom staircase, which is sustainably grown larch composite board. Other common sense green features include operable skylights in the stairwell and the sitting area, high-efficiency glazing and lamb's-wool insulation.
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(Images: Charlie Crane for Dwell)