23.75.110
Rooftop features
Seattle Municipal Code · Seattle Mun. Code § 23.75.110
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A. Flagpoles and religious symbols for religious institutions are exempt from height controls, except as regulated in Chapter 23.64 , provided they are no closer to any lot line than 50 percent of their height above the roof portion where attached. B. Open railings, planters, skylights, clerestories, parapets and firewalls may extend 4 feet above the applicable height limit set in Section 23.75.100 . C. Rooftop solar collectors may extend up to 10 feet above the applicable height limit set in Section 23.75.100 . D. The following rooftop features may extend above the applicable height limit set in Section 23.75.100 if none of those features extends more than 15 feet above the applicable height limit set in Section 23.75.100 and the combined total coverage of all those features that extend above the applicable height limit and any elevator penthouse does not exceed 30 percent of the roof area, or 35 percent of the roof area if the total includes screened or enclosed mechanical equipment: 1. Stair penthouses that are not also elevator penthouses; 2. Mechanical equipment; 3. Play equipment and open-mesh fencing that encloses it, if the fencing is at least 5 feet from the roof edge; 4. Chimneys; 5. Sun and wind screens, and similar weather protection features such as eaves or canopies extending from rooftop features; 6. Penthouse pavilions for the common use of residents; 7. Greenhouses and solariums; 8. Wind-driven power generators; 9. Covered or enclosed common amenity areas; or 10. Minor communication utilities and accessory communication devices, except that height is regulated according to the provisions of Section 23.57.011 . E. Subject to the roof coverage limits in subsection 23.75.110.D, height exceptions for elevator penthouses are as follows: 1. Within the view corridor height restriction area depicted in Exhibit A for 23.75.100 , an elevator penthouse may extend above the applicable height limit by up to 15 feet. 2. Outside the view corridor height restriction area depicted in Exhibit A for 23.75.100 , an elevator penthouse may extend above the applicable height limit by up to 25 feet. If the elevator provides access to a highrise rooftop that includes residential amenity area or a green roof, the penthouse may extend above the applicable height limit by up to 35 feet. 3. A stair penthouse may be the same height as an elevator penthouse if the elevator and the stairs are located within a common penthouse. F. Greenhouses and solariums are permitted to extend 15 feet above the applicable height limit, if, together with all features gaining additional height through subsections 23.75.110.D and 23.75.110.E, they do not exceed 60 percent of the roof area. G. To protect solar access for property to the north, the applicant shall locate the rooftop features listed in this Section 23.75.110 that extend above the applicable height limit at least 10 feet from the northerly edge of the roof, except that stair and elevator penthouses may extend to the edge of the roof for a total length along the edge of not more than 30 feet. H. Portions of a sloped roof that are completely surrounded by a parapet may exceed the applicable height limit to allow drainage, provided that the highest point of the roof does not exceed the applicable height limit in Section 23.75.100 by more than 75 percent of the amount by which the parapet extends above the height limit. See Exhibit A for 23.75.110 . I. For any structure with a green roof, up to 24 inches of additional height above the applicable height limit in Section 23.75.100 is allowed to accommodate the structural requirements, roofing membranes, and soil for that green roof. See Exhibit B for 23.75.110 . (Ord. 126600 , § 17, 2022; Ord. 123963, § 26, 2012.)