Sharps Farm, Bathealton, Somerset. A farmhouse with a three-bedroom annexe, wood-burning stoves and a dining kitchen with an Aga. Electricity is supplied by a wind turbine and it has photovoltaic solar panels. 4 beds, 4 baths, 2 receps, dining kitchen, indoor swimming pool, outbuildings, lake, 119 acres. £2.95m Strutt & Parker 01392-215631.
The Roundhouse, Old Knebworth, Hertfordshire. This house was built from reclaimed local materials and is almost entirely off-grid. It has solar panels, rainwater collection, a biomass boiler and battery storage. 5 beds, 3 baths, open-plan kitchen/living area, gym, balcony, gardens. £2.5m The Modern House 020-3795 5920.
Tan y Coed II, Oswestry, Shropshire. A renovated Welsh longhouse dating from 1800 with modern additions. It has wood-block floors and a kitchen leading onto a vaulted garden room with floor-to-ceiling windows.…