Rockville, MD Accessory Structures: Shed & Carport Rules (2026)
Shed permit rules in Rockville, MD, also referred to as storage shed, backyard shed, or accessory building regulations, set size limits, setbacks, and when a building permit is required.
Key Facts
- Governing section
- Zoning § 25.8.1.3, accessory structures
- Attachment rule
- No shared wall or roof
- Max footprint
- 750 square feet per structure
- Max height
- 20 feet or roof peak
- Placement
- Must be located in rear yard
Summary
Rockville zoning treats a carport as an accessory structure: it can't share a wall or roof with the house except through a short breezeway, and a detached carport must sit in the rear yard within set height and footprint caps.
Accessory buildings and structures must be customarily associated with, and clearly incidental and subordinate to, a legally established principal structure. Attaching these structures to the main building by any part of a common wall or common roof is prohibited, except as follows: (1) One accessory building on a lot may be connected to a main building by an open, unenclosed breezeway no more than 20 feet long.
Full Breakdown
Under § 25.8.1.3 of the 2026 Zoning Ordinance, carports fall under the City's general rules for accessory buildings and structures on single-unit, townhouse, multiplex, and cottage-court lots. An attached carport can't share a common wall or roof with the house: the only allowed connection is a single open, unenclosed breezeway of 20 feet or less. A detached carport must stand in the rear yard, is capped at 750 square feet (or the main building's footprint, if smaller), and can't exceed 20 feet in height or the main roof's peak, whichever is less, with setbacks that grow as the structure's height increases past 12 feet.
Violations & Fines
A carport built onto the house without qualifying as a breezeway connection, or one exceeding the rear-yard, height, or footprint limits, is a zoning violation: a municipal infraction under § 25.13.2.1(a) and § 1-9, up to $400 per day.
Frequently Asked Questions
Can a carport attach directly to my house in Rockville?
How big can a detached carport be in Rockville?
Sources & Official References
Other rules in Rockville
How Rockville compares: Shed Permit Requirements by City·Compare Rockville to another location·View the Maryland accessory structures overview
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How other cities in Montgomery County handle shed & carport rules.