Gaithersburg, MD Accessory Structures: Shed Rules (2026)

Gaithersburg regulates accessory structures including storage sheds through its zoning ordinance and building code. Sheds with a floor area under 200 square feet and a height under 12 feet are exempt from building permit requirements but must still comply with zoning setback and placement rules. A zoning compliance review may still be advisable before construction. Sheds 200 square feet or larger require a building permit from the Building Division at (301) 258-6330. All sheds must be located in rear yards only. Side and rear setbacks are typically 3 feet from property lines in single-family residential zones, though some zoning districts may require greater setbacks. Sheds may not exceed 15 feet in height. Total lot coverage including all structures must not exceed the maximum impervious surface ratio for the zoning district. Sheds placed on permanent foundations may be assessed as improvements for property tax purposes. Metal, wood, and vinyl sheds are all permitted, but some HOA covenants may restrict materials and colors. Sheds may not be used as dwelling units, home businesses, or for storage of hazardous materials. Electrical service to sheds requires a separate electrical permit. Contact the Department of Planning and Code Administration at (301) 258-6330 for setback verification.