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New York, NY Fence Regulations: Retaining Walls (2026)

Some Restrictions
Compiled from the official code textEditor Martyn O'NeillLast verified August 2026

Key Facts

Inspection trigger
10 ft height, fronting street
Assessment cycle
At least every 5 years
Who inspects
Registered design professional
Fee
Report filing fee to DOB
Grade-change wall cost
Owner pays, own property only

Summary

New York City requires an owner who sets their grade higher or lower than a neighbor's to build a retaining wall at their own cost, and walls 10 feet or taller fronting a public right-of-way need a professional condition assessment every five years.

Owners of retaining walls with a height of ten feet or more and fronting a public right-of-way shall comply with the requirements of this section. For the purposes of this section, the height of a retaining wall shall be the distance from the top of the ground in front of the wall to the top of the wall stem, or wall step for stepped walls, including any parapets or fencing capable of retaining material.

Source: New York City Administrative Code § 28-305.1 Retaining Walls, Partition Fences and Other Site StructuresView official code

Full Breakdown

Under Administrative Code § 28-305.2, an owner who elects to set their grade differently from an adjoining property must erect, maintain and repair a retaining wall of sufficient height, structure and foundation to support the grade differential, entirely on their own property and at their own expense. Once a wall reaches 10 feet in height and fronts a public right-of-way, § 28-305.4.2 kicks in: a registered design professional must conduct a condition assessment at least every five years and file a certified report with the Department of Buildings, along with a report filing fee, per §§ 28-305.4.3 through 28-305.4.5.

Violations & Fines

If an assessment finds an unsafe condition, the design professional must notify DOB immediately via 311 and in writing; the owner must then secure public safety, obtain a permit to make repairs, and file a reinspection report within two weeks certifying the fix.

Frequently Asked Questions

Does every backyard retaining wall need a DOB inspection?
No. Only walls 10 feet or taller that front a public right-of-way must undergo the recurring condition-assessment regime under Administrative Code § 28-305.4.2.
Who pays for a wall needed because of a grade difference?
The owner who sets a different grade than the neighboring property must build and maintain the wall entirely on their own land and at their own expense, per § 28-305.2.

Sources & Official References

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