Boston requires a building permit for any retaining wall over 4 feet tall measured from footing to top, and engineered drawings for walls over 4 feet or walls supporting a surcharge.
Under 780 CMR (Massachusetts State Building Code) and Boston Inspectional Services permitting rules, retaining walls up to 4 feet tall with no surcharge (no structure or driveway loading the wall) can be built without a permit. Walls taller than 4 feet, or walls of any height supporting a slope, structure, or driveway require a building permit, Massachusetts-registered PE stamped drawings, and inspection at footing and backfill stages. Drainage (weep holes, perforated drain pipe) is required. Walls adjacent to sidewalks need a Public Works street occupancy permit during construction. Historic districts add a commission review layer.
Specific penalty amounts for this ordinance are not published in a publicly accessible fine schedule. Contact Boston code enforcement directly for current fines, enforcement procedures, and hearing options.
Boston, MA
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Boston, MA
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