Location. An Accessory Dwelling Unit is permitted in any zone that allows residential units. ADUs shall be located on a property with a primary dwelling and shall be located such that the front facade is farther from the front Property line than the primary dwelling. Number of ADUs. No more than one junior accessory dwelling unit and one accessory dwelling unit are permitted on a single lot with a single family dwelling. Lots with existing multifamily dwellings shall have a number of internal or attached accessory dwelling units equal to twenty-five percent of the existing multifamily dwelling units. Fractions of units of one-half and above shall be rounded up. Accessory dwelling units may include portions of dwelling structures that are not used as livable space, including, but not limited to, storage rooms, boiler rooms, passageways, attics, basements, or garages; provided, that each unit complies with state building standards for dwellings. At least one accessory dwelling unit shall be permitted per lot within existing multifamily dwellings. Not more than two detached accessory dwelling units shall be permitted on lots with existing multifamily dwellings.
(1) Every ADU shall contain a minimum of five hundred square feet.
(2) The size of a detached ADU shall not exceed one thousand square feet or one hundred percent of the primary dwelling unit size, whichever is less. If the primary dwelling unit size is less than eight hundred fifty square feet, the maximum size of the detached ADU shall not exceed eight hundred fifty square feet.
(3) Attached ADUs shall be limited to eight hundred fifty square feet or fifty percent of the primary dwelling unit size, whichever is less.
(4) All ADUs are subject to Section
12-6 of Chapter 12 of the IMC.