According to Statistics Canada...
A single-detached house is a "single dwelling not attached to any other dwelling or structure (except its own garage or shed). A single-detached house has open space on all sides, and has no dwellings either above it or below it. A mobile home fixed permanently to a foundation is also classified as a single-detached house."
A semi-detached house is "one of two dwellings attached side by side (or back to back) to each other, but not attached to any other dwelling or structure (except its own garage or shed). A semi-detached dwelling has no dwellings either above it or below it, and the two units together have open space on all sides."
A row house is "one of three or more dwellings joined side by side (or occasionally side to back), such as a townhouse or garden home, but not having any other dwellings either above or below. Townhouses attached to a high-rise building are also classified as row houses."
An apartment or flat in a duplex is "one of two dwellings, located one above the other, may or may not be attached to other dwellings or buildings."
An apartment in a building that has five or more storeys is a "dwelling unit in a high-rise apartment building which has five or more storeys."
An apartment in a building that has fewer than five storeys is a "dwelling unit attached to other dwelling units, commercial units, or other non-residential space in a building that has fewer than five storeys.
Other single-attached house is a "single dwelling that is attached to another building and that does not fall into any of the other categories, such as a single dwelling attached to a non-residential structure (e.g., a store or a church) or occasionally to another residential structure (e.g., an apartment building)."
A mobile home is a "single dwelling, designed and constructed to be transported on its own chassis and capable of being moved to a new location on short notice. It may be placed temporarily on a foundation pad and may be covered by a skirt."
Other movable dwelling such as a "single dwelling, other than a mobile home, used as a place of residence, but capable of being moved on short notice, such as a tent, recreational vehicle, travel trailer, houseboat or floating home."
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