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Building elements

Storey-and-a-half house

A storey-and-a-half house has a full ground floor and a second floor built into the roof, with sloping ceilings and knee walls.

Also known as 1.5 storey house, one and a half storey house, story and a half, chalet bungalow, room-in-roof house

The upper floor uses the roof space, so the house needs a steep roof and a roof structure that leaves the space open: frame (A-) trusses, attic trusses or a rafter roof. Dormers or roof windows bring in light and headroom.

The type is very common in Sweden (1½-planshus) and appears as the chalet bungalow in the UK and the story-and-a-half house in North America.

Related terms
Frame truss (A-truss)A frame truss (A-truss) is a roof truss built as an open frame of rafters, tie, collar beam and side struts, leaving the roof space free for a room. Attic trussAn attic truss leaves an open rectangular space in the middle of the roof, so the loft can be used as a room. Knee wallA knee wall is a short vertical wall or strut under the slope of the roof, forming the low side wall of a room in the roof.
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