RICS definition of a bungalow:
Bungalow
Originates from India and Bengal. Described simply as a low house having one storey.
Ward v Paterson [1929] 2 Ch 396 defines a bungalow is a building of which the walls, with the exception of any gables, are no higher than the ground floor, and of which the roof starts at a point substantially not higher than the top of the wall of the ground floor, and it does not matter in what way the space in the roof of a building so constructed is used (per Romer J.,
Chalet bungalow used to describe bungalows with upper rooms set in the roof usually with dormer windows.