205.1 A penthouse or rooftop structure on a single household dwelling or flat shall be permitted only in accordance with Subtitle C § 1501.

205.2 A mechanical penthouse or rooftop structure with a maximum height of eighteen feet, six inches (18 ft. 6 in.) shall be permitted on a building constructed pursuant to Subtitle E §§ 203.5 through 203.8.

205.3 For all other buildings and uses, the maximum permitted height of a penthouse or rooftop structure shall be twelve feet (12 ft.) and one (1) story.

SOURCE: Final Rulemaking published at 63 DCR 2447, 2887 (March 4, 2016 – Part 2); as amended by Final Rulemaking published at 64 DCR 4055 (April 28, 2017); as amended by Final Rulemaking published at 64 DCR 8416 (August 25, 2017); as amended by Final Rulemaking published at 66 DCR 2337 (February 22, 2019); as amended by Final Rulemaking published at 67 DCR 8068 (July 3, 2020); as amended by Final Rulemaking published at 70 DCR 011297 (August 25, 2023).