Before You Build in Rockville, MD: Permit & Rule Checklist (2026)

Rockville limits front yard fences to 4 feet and side/rear yard fences to 6 feet under Zoning Ordinance Chapter 25, Article 9. All fences require a zoning permit.

Rockville requires a building permit for retaining walls over 4 feet from footing to top. Maximum height is 6 feet 6 inches. Walls must comply with IRC Section R404.

Rockville requires a zoning permit for all fence installations. Fences over 6 feet also need a building permit. Applications must include a site plan showing property lines.

COMAR 10.17.01.21 requires Rockville pool barriers at least 48 inches high with self-closing, self-latching gates opening away from the pool. No 4-inch sphere passage allowed.

Rockville does not require neighbor consent for fence installation, but fences must be placed entirely on the owner's property. Boundary fences are jointly owned under Maryland law.

Rockville pools must comply with Montgomery County and Maryland safety standards including barrier enclosure, self-closing gates, electrical bonding and grounding, and proper drainage. Pool owners are responsible for maintaining safe conditions and preventing unauthorized access, particularly by children.

Hot tub and spa installations in Rockville require a building permit and electrical permit from the Inspection Services Division. Outdoor hot tubs must comply with barrier and fencing requirements under Chapter 5 of the Rockville City Code and COMAR 10.17.01. Units holding more than 24 inches of water require the same safety enclosures as swimming pools.

Above-ground pools exceeding 18 inches in depth require a building permit from Montgomery County DPS. Pools that are at least 4 feet tall do not require additional fencing if equipped with a detachable ladder, but shorter above-ground pools must have a barrier installed to bring the total height to the required level.

A building permit is required before construction or substantial alteration of any private swimming pool in Rockville. Montgomery County Department of Permitting Services handles residential pool permits and will not issue a pool building permit until the owner has also applied for a permit for the required enclosing fence or wall.

Any swimming pool over 18 inches deep in Rockville must be enclosed by a fence or wall at least 5 feet high. All gates must have self-closing, self-latching hardware with the latch on the pool side at a height of not less than 4 feet from the ground. Gates must remain closed and latched when the pool is unattended.

Rockville permits attached accessory dwelling units as a conditional use in residential zones under zoning text amendment TXT2023-00263, effective April 9, 2024. Attached ADUs may be built within or as an addition to single-unit detached homes. The property owner must occupy either the main dwelling or the ADU for at least six months per year, and the ADU cannot exceed 50 percent of the primary dwelling floor area.

Garage conversions in Rockville require a building permit and must comply with zoning, building, and fire code requirements. Converting a garage to living space may be treated as an attached ADU under the 2024 zoning text amendment, requiring conditional use approval. The conversion must maintain required off-street parking spaces for the property.

Rockville does not have a specific tiny home ordinance. Tiny homes on foundations may qualify as attached ADUs under the 2024 zoning amendment if they meet conditional use and size requirements. Tiny homes on wheels are classified as recreational vehicles and cannot serve as permanent dwellings. All habitable structures must meet the International Residential Code minimum standards adopted by the city.

Carports in Rockville are regulated as accessory structures under Chapter 25 of the City Code and require a building permit. They must meet rear yard setback requirements of at least 3 feet from lot lines and cannot exceed the maximum height or coverage limits for accessory buildings. Carports in front yards are generally not permitted in residential zones.

Rockville requires a building permit for sheds and accessory buildings. Chapter 25 of the Rockville City Code sets a maximum footprint of 750 square feet for any single accessory building and 1,000 square feet total for all accessory buildings on one lot. Minimum setback is 3 feet from lot lines, with additional setbacks required for structures taller than 12 feet.

All open burning without a permit is prohibited in MoCo. Fire pits must be 25 feet from buildings and attended. Summer ban runs June 1 to August 31. Fines are $500 per day.

Recreational fires in Rockville follow Montgomery County open burning rules. Fires using dry natural wood (max 3 ft diameter), attended by an adult, with a 10-ft firebreak, may be allowed. MDE burn permit required for larger fires.

Rockville is served by WSSC Water (Washington Suburban Sanitary Commission), which imposes mandatory outdoor watering restrictions during drought conditions. When mandatory restrictions are in effect, all outdoor water use is banned including lawn watering, filling pools, and washing outdoor surfaces, with violations subject to $500 fines enforced through Montgomery County.

Rockville's Forest and Tree Preservation Ordinance (Chapter 10.5) requires a Significant Tree Removal Permit for removal of any tree with a diameter exceeding 4 inches measured 12 inches above ground, or any flowering tree exceeding 2 inches in diameter. Removed trees must be replaced according to city-established mitigation rates.

Rockville's Forest and Tree Preservation Ordinance (Chapter 10.5) prohibits residents from pruning, removing, or conducting any tree care on trees located in the public right-of-way or city parks without authorization. Private trees may be trimmed by the property owner, but any work affecting significant trees requires compliance with city forestry standards.