A three-storey, five-bedroomed semi-detached house has been renovated using green principles. Internal and external wall insulation, air-tight membranes and sheep's wool insulation have been used to minimise heat loss. Solar water heating and a wood-burning boiler, with a heat storage system, make the house self-sufficient for space and water heating. Rainwater is collected in tanks in the cellar which can store up to 2500 litres of water, giving a water saving of 35%. Solids are separated from waste water and collected in a chamber which contains a raft covered with coir compost and worms.