New York City Underpinning: Design, Access, Notices and Inspection

Reviewed September 7, 2026.

Underpinning and other support work can affect the stability of both the project and adjoining buildings. Qualified design and engineering review should determine the necessary method, sequencing, monitoring and inspections before work begins.

NYC Building Code § 3309.5 addresses underpinning or alternate support required to protect adjoining property. Its access provisions must be read with the other applicable code and property-law requirements. Refusal of access should be evaluated with counsel; it is not permission to proceed with an unsafe operation.

Use current filing procedures

DOB’s excavation guidance requires notice 24 to 48 hours before applicable earthwork, submitted through DOB NOW: Build for both BIS and DOB NOW jobs. Follow cancellation requirements if the schedule changes. Most work, including underpinning, requires permits and compliance with approved plans.

Arrange required special inspections, preconstruction documentation and monitoring under the code applicable to the job. The old article’s 2010 form references and stalled-site bulletin should not be treated as a complete current checklist.

Obtain a properly documented access agreement or appropriate court relief under RPAPL 881 before entering neighboring property. Coordinate plans, insurance, duration, protection, restoration and damage responsibility. DOB inspections do not relieve project participants of their own duties.

Kushnick Pallaci PLLC assists clients throughout New York with underpinning and adjoining-property disputes. Contact 631-752-7100 or vtp@kushnicklaw.com.

Attorney Advertising. General information, not legal advice.