This striking extension replaced a large conservatory which had no doors between it and the rest of the house, so served to overheat the house in summer, and to cause huge heat loss in winter. The extension utilised an exposed douglas fir timber frame to retain a lightweight feel to the space whilst being well insulated externally with wood fibre board. The roof structure is timber I joists packed with cellulose insulation, topped with a sedum roof. The original back wall of the house is finished with a warm and soft earth plaster to contrast with the clean lines of the timber frame and to make a distinctive break with the original house.  The result is a bright and cosy space which stays cool in summer and warm in winter, and flows into a new open plan kitchen.