23.86.016
Structure and lot depth measurement
Seattle Municipal Code · Seattle Mun. Code § 23.86.016
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A. Structure depth is measured as follows: 1. Draw the smallest rectangle that encloses a principal structure. 2. Structure depth is the length of the sides of that rectangle most closely parallel to the side lot lines (Exhibit A for 23.86.016 ). Exhibit A for 23.86.016 Structure depth 3. If more than one structure is located on a lot and no portion of a structure is behind any portion of another structure and the structures are separated by a minimum of 10 feet, the maximum depth of each structure shall be measured individually (See Exhibit B for 23.86.016 ). If any portion of a structure is behind any portion of another structure then the structure depth shall be measured as the combined depth of the principal structures on the lot. Exhibit B for 23.86.016 Depth measurement for offset structures B. Portions of a structure considered part of the principal structure for the purpose of measuring structure depth are as follows: 1. Carports and garages attached to the principal structure, unless they are attached by a structural feature not counted in structure depth under subsection 23.86.016.C; 2. Accessory structures, other than carports and garages, that are not listed in subsection 23.86.016.C, if they are less than 3 feet from the principal structure at any point; 3. Exterior corridors, hallways, and open, above-grade walkways; 4. Enclosed porches, decks, balconies, and other enclosed projections; and 5. Projecting segments of a facade unless they are not counted in structure depth in subsection 23.86.016.C. C. Portions of a structure that are not considered part of the principal structure for the purpose of measuring structure depth are as follows: 1. The first 4 feet of eaves, cornices, and gutters that project from an exterior wall; 2. The first 18 inches of chimneys that project from an exterior wall; 3. Attached solar greenhouses meeting minimum energy standards administered by the Director; 4. The first 4 feet of unenclosed decks, balconies, and porches, unless located on the roof of an attached garage or carport included in structure depth in subsection 23.86.014.B.1; 5. Arbors, trellises, and similar features; and 6. In LR3 zones in the Northgate Overlay District, portions of a structure that are exempt from FAR limits pursuant to subsection 23.45.510.D.5. D. Determining lot depth. If development standards are based on lot depth, lot depth is determined as follows: 1. If the lot is essentially rectangular and has a rear lot line within 15 degrees of parallel to the front lot line, the lot depth is the horizontal distance between the midpoints of the front and rear lot lines (Exhibit C for 23.86.016 ). 2. If the lot is triangular or wedge-shaped, lot depth shall be the horizontal distance between the midpoint of the front lot line and the rear point of the lot. If the lot does not actually come to a point, lot depth is measured from midpoint of the front lot line to the midpoint of the rear lot line. 3. In the case of a through lot, lot depth is measured between the midpoint of each front lot line. 4. When lot shape is so irregular that subsections 23.86.016.D.1, 23.86.016.D.2 or 23.86.016.D.3 cannot be used, lot depth is the distance equal to the result of lot area divided by length of front lot line, provided that in no case is the depth permitted to be greater than the distance from front lot line to the furthest point on the perimeter of the lot. Exhibit C for 23.86.016 Measuring Lot Depth (Ord. 125791 , § 115, 2019; Ord. 124843 , § 68, 2015; Ord. 124378 , § 98, 2013; Ord. 123495, § 99, 2011; Ord. 118414, § 62, 1996; Ord. 114887, § 11, 1989; Ord. 113041, § 23, 1986; Ord. 111390, §§ 51, 52, 1983; Ord. 110793, § 74, 1982; Ord. 110570, § 24, 1982.)