Rockville, MD Building Setbacks & Zoning: Setback Rules (2026)

The City of Rockville Zoning Ordinance (Chapter 25 of the City Code) establishes minimum setback requirements for all structures based on zoning district classification. In the R-60 single-family residential zone, one of the most common in Rockville, the front yard setback is 25 feet from the property line, side yard setbacks are 8 feet each (with a combined minimum of 18 feet for both sides), and the rear yard setback is 25 feet. The R-90 and R-150 zones have larger lot requirements and correspondingly greater setbacks, with front setbacks reaching 30 to 40 feet. In the R-40 zone for smaller lots, front setbacks may be reduced to 20 feet. Mixed-use zones such as MXT and MXTD have variable setback requirements based on build-to lines rather than minimum setbacks, reflecting their urban character. Corner lots have special requirements with street-side setbacks typically equal to the front setback. Accessory structures including detached garages, sheds, and ADUs have their own setback rules, generally requiring at least 5 feet from side and rear lot lines. Patios and decks may project into setbacks under certain conditions. Fences and retaining walls have separate setback and height standards. Property owners seeking to build closer to lot lines than permitted may apply for a variance from the Board of Appeals, which requires demonstrating a practical difficulty or hardship unique to the property. Many Rockville HOA communities have architectural review requirements that may impose setbacks exceeding the zoning minimum. Contact the Department of Community Planning and Development Services at 240-314-8200 for setback determination.