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Unit definition based on San Francisco Building Code
Every jurisdiction may define a unit, or a living compound differently based on the size and use. Here is the unit definition based on San Francisco Building Code
Apartment. "Apartment" means a dwelling unit as defined below.
Apartment House. "Apartment house" is any building or portion of it that contains three or more dwelling units and includes residential condominiums.
Dwelling. A building, or portion thereof, containing one or more Dwelling Units. A "one-family dwelling" is a building containing exclusively a single Dwelling Unit. A "two-family dwelling" is a building containing exclusively two Dwelling Units. A "three-family dwelling" is a building containing exclusively three Dwelling Units.
Dwelling Unit. A Residential Use is defined as a room or suite of two or more rooms that is designed for or is occupied by, one family doing its cooking therein and having only one kitchen.
A housekeeping room as defined in the Housing Code is a Dwelling Unit.
A Live/Work Unit, as defined in the Planning Code, is not considered a Dwelling Unit. It is a hybrid Residential and PDR Use that is defined as a structure or portion of a structure combining a residential living space for a group of persons including not more than four adults in the same unit with an integrated workspace principally used by one or more of the residents of that unit.
Dwelling Unit, Accessory. Also known as a Secondary Unit or In-Law Unit, is a Dwelling Unit that is constructed either entirely within the existing built envelope, the “living area” as defined in State law, or the buildable area of an existing or proposed building in areas that allow residential use; or is constructed within the existing built envelope of an existing and authorized auxiliary structure on the same lot.
Residential Unit. A legal conforming or non-conforming Dwelling Unit or a legal non-conforming Live/Work Unit.
Building. Any structure having a roof supported by columns or walls.
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