The old conservatory was the weak link — a white uPVC box with a translucent roof, shut off from the rest of the house behind a door. 

In its place the back of the bungalow opens into one kitchen, dining and living room beneath a vaulted ceiling. A new gable rises over the garden elevation, with a full-height apex window above wide sliding doors: the doors give the garden, the apex gives daylight from high up where nothing overlooks it. Pale boarding in the gable marks the new work as new without competing with the original brick. 

A new utility room and downstairs WC take the practical business of the house out of the main room. The single-storey form stays legible from outside — the house is bigger and far lighter, without having become a different kind of house.