23.86.012

Setback and separations measurement

Seattle Municipal Code · Seattle Mun. Code § 23.86.012

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A. For purposes of setback and separation standards, measurement shall be taken to the outside of building foundations and exterior walls rather than to exterior finishing provided that exterior finishes extend no more than 8 inches into a required setback. B. Setback averaging. In multifamily and commercial zones, certain required setbacks may be averaged. In such cases: 1. The average front and rear setbacks are calculated based on the entire width of the structure; 2. The average side setbacks are calculated based on the entire depth of the structure; 3. Setbacks are measured horizontally from the lot line to the facade of the structure. The facade(s) used in calculating the average and minimum setback requirements shall be those facades that are nearest to that lot line except that any features allowed to project into the setback are excluded. C. Upper-level setback 1. Upper-level setbacks apply only to portions of structures that occur above the height at which the setback begins. 2. For upper-level setbacks required from a street lot line, the height at which the setback begins is measured at all points along the street lot line from sidewalk grade or, if there is no sidewalk, from finished grade at the street lot line. 3. For upper-level setbacks required from other lot lines, the height at which the setback begins is measured at all points along the lot line from the finished grade where the wall meets the grade or, if the structure is cantilevered or posted, where the downward projection of the portion of the structure that is cantilevered or posted meets the grade. (Ord. 127376 , § 96, 2025; Ord. 125791 , § 112, 2019; Ord. 125081 , § 5, 2016; Ord. 124843 , § 67, 2015; Ord. 123495, § 96, 2011; Ord. 115326, § 39, 1990; Ord. 115002 , § 21, 1990; Ord. 114887, § 9, 1989; Ord. 113041, § 22, 1986; Ord. 112971, § 2, 1986; Ord. 111100, § 12, 1983; Ord. 110793, § 72, 1982; Ord. 110570, § 22, 1982.)