Rockville, MD Building Setbacks & Zoning: Structure Height Limits (2026)

The City of Rockville Zoning Ordinance establishes maximum building height limits by zoning district. In single-family residential zones (R-40, R-60, R-90, R-150), the maximum building height is generally 35 feet, measured from the average finished grade to the highest point of the roof. Some residential zones allow up to 40 feet. This effectively limits structures to two and a half to three stories. Height measurement methodology follows the zoning ordinance definition, which specifies measurement from the average grade plane at the building perimeter to the midpoint of a pitched roof or the top of a flat roof. Chimneys, antennas, and mechanical equipment may project above the height limit subject to limitations. In mixed-use zones (MXT, MXTD), building heights are established through the site plan approval process and can range from 50 to 150 feet or more depending on the zone and approved master plan for the area. The Rockville Pike Plan Area and Town Center allow increased density and height to support transit-oriented development near Metro stations. The Twinbrook area master plan envisions buildings of significant height near the Twinbrook Metro station. Accessory structures in residential zones are limited to 15 feet or one story. Height bonuses may be available in certain zones for developments that include affordable housing, green building features, or public amenities. The Board of Appeals may grant height variances in limited circumstances. Contact the Department of Community Planning and Development Services at 240-314-8200 for height limits applicable to a specific property.