A retaining wall over 4 feet tall, measured from the bottom of the footing, needs a Harford County building permit and engineered design under the International Residential Code. Shorter unloaded walls are exempt, but any wall carrying a surcharge requires a permit at any height.
Retaining walls in Harford County are governed by the International Residential Code, enforced by the county's Division of Building Services. A wall 4 feet or less in height, measured from the bottom of the footing to the top, and not supporting a surcharge such as a driveway or slope above it, needs no building permit. A taller wall, or any wall carrying a surcharge, requires a building permit and typically a Maryland-licensed engineer's design. Zoning setbacks still apply, and a wall that redirects stormwater onto a neighboring property creates civil liability.
Building a regulated retaining wall over 4 feet without a permit draws a stop-work order and fines and can be ordered corrected. Walls diverting drainage onto a neighbor invite a civil claim.
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