The clients recently bought this very run-down Bungalow. They wished to demolish the existing rear of the house and built a larger rear extension. I have obtained Planning Consent for the Rear Extension and Structural Engineer Calculations. I will now apply for Building Control Approval. The builder has proposed to span this new extension with easy-joists. It will have a flat roof with two lantern roof lights, bi-folds and fixed full height windows. I proposed a symmetrical plan and. elevation to reflect the symmetrical hip to gable bungalow.