Retaining walls over 4 feet or supporting a surcharge require DOB permits and licensed professional design in Brooklyn under NYC Building Code.
Under NYC Building Code §1807 and Admin Code §28-105.1, retaining walls exceeding 4 feet in height (measured from bottom of footing to top of wall), or retaining walls of any height supporting a surcharge such as a structure, driveway, or sloped grade, require a Department of Buildings (DOB) permit and must be designed by a licensed professional engineer or registered architect. Construction must be performed by a licensed contractor. Walls located near lot lines require special consideration for adjacent property protection under NYC Admin Code §28-3309. Landmark district properties require additional LPC review. Inspection and sign-off by DOB are required before backfill is concealed.
Specific penalty amounts for this ordinance are not published in a publicly accessible fine schedule. Contact Kings County code enforcement directly for current fines, enforcement procedures, and hearing options.
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