Attached accessory dwelling units shall not exceed 25 feet in height except when the accessory dwelling unit is the result of the conversion of existing space or accessory dwelling units are proposed as part of a new planned unit development. Except for an attached accessory dwelling unit that meets the Statewide Exemption Accessory Dwelling Unit Standards in Section
18.106.020, attached accessory dwelling units shall be subject to the minimum front, rear, and side yard requirements of the main structure as identified in Chapter
18.84, including requirements prescribed in Section
18.84.100. Only in instances when complying with the front yard setback for the main structure precludes an accessory dwelling unit shall the accessory dwelling unit be permitted to encroach into the front yard setback but this encroachment shall be limited only to the extent necessary to accommodate the accessory dwelling unit. No setbacks are required for a legally existing living area that is converted to an accessory dwelling unit or to a portion of an accessory dwelling unit.
Height of the attached accessory dwelling unit is measured vertically from the average elevation of the natural grade or finished grade, whichever is lower, of the ground covered by the accessory dwelling unit to the highest point of the structure including parapet or to the coping of a flat roof, to the deck line of a mansard roof, or to the mean height between eaves and ridges for a hip, gable, or gambrel roof. Accessory dwelling units are limited to two stories. An accessory dwelling unit proposed on the second story shall not exceed 25 feet in height and shall meet the objective standards for second-story accessory dwelling units identified in Section 18.106.060(C)(2).