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.
Under the Rockville building code, retaining walls exceeding 48 inches (4 feet) in height measured from the bottom of the footing to the top of the wall require a building permit and engineered plans. The maximum height of a retaining wall is 6 feet 6 inches consistent with Montgomery County residential standards. Wall height is measured from the lowest level of the grade abutting the wall per IRC Section R404. Retaining walls supporting a surcharge such as a driveway, structure, or additional soil load may require a permit regardless of height. Engineered plans prepared by a licensed professional engineer may be required for walls over 4 feet or those supporting surcharges. Retaining walls must also comply with zoning setback requirements under Chapter 25 and cannot encroach on public rights-of-way or utility easements. Drainage must be addressed through proper design including weep holes, gravel backfill, or drainage pipe systems to prevent hydrostatic pressure buildup and water damage to adjacent properties.
Retaining walls built without required permits are subject to stop-work orders and notices of violation. Property owners must apply for after-the-fact permits and may need to commission engineering evaluations. Walls causing drainage problems to neighboring properties may trigger additional enforcement.
Rockville, MD
Construction noise in Rockville is permitted 7 AM to 7 PM weekdays and 9 AM to 5 PM weekends under MoCo Code Section 31B-6. Nighttime deliveries are prohibit...
Rockville, MD
Industrial noise in Rockville is regulated under MoCo Code Chapter 31B. Industrial limits are 75 dBA day, 70 dBA night. Equipment running 24 hours must meet ...
Rockville, MD
Rockville enforces noise limits under MoCo Code Chapter 31B. Daytime runs 7 AM to 9 PM weekdays, 9 AM to 9 PM weekends. Nighttime limit is 55 dBA at resident...
Rockville, MD
Rockville's animal control ordinance (Chapter 3) prohibits nuisance animal noise. Owners must prevent dogs from causing persistent noise that disturbs neighb...
Rockville, MD
Rockville sits between Reagan National and BWI but is outside both noise zones. Aircraft noise is federally regulated. The Maryland Environmental Noise Act o...
Rockville, MD
Maryland requires new homes after October 2023 to include EV-ready parking with a minimum 40-amp dedicated circuit. HOAs cannot prohibit charger installation.
Side-by-side rule comparisons with other cities in Montgomery County.
See how other cities in Montgomery County handle retaining walls.
See how Rockville's retaining walls rules stack up against other locations.
Quick Compare
Help us keep this page accurate. If you notice an error or outdated information, let us know.