Retaining walls in Manhattan are regulated under the NYC Building Code and Zoning Resolution. Walls over 4 feet in exposed height require licensed design professionals and a NYC Department of Buildings permit.
Manhattan has limited grade change compared to other boroughs, but retaining walls are found in parts of Inwood, Washington Heights, Hamilton Heights, and Morningside Heights where rock outcroppings and steep streets are common. The NYC Building Code classifies any retaining wall over 4 feet in height (measured from the bottom of the footing to the top of the wall) as a structure that must be designed by a licensed architect or professional engineer and built under a DOB permit. Walls supporting a surcharge such as a driveway, building, or sidewalk are regulated regardless of height. Owners have a continuing duty to maintain retaining walls in safe condition. Local Law 37 and DOB periodic inspection requirements may apply to walls along public rights of way. Failed or leaning walls can trigger emergency declarations and forced repair orders.
Contact your local code enforcement office for specific penalty information.
New York County, NY
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New York County, NY
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New York County, NY
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New York County, NY
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New York County, NY
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New York County, NY
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See how New York County's retaining walls rules stack up against other locations.
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