NYC DOB Permits for Commercial Interior Alterations

Classify the proposed work with the design professional

NYC DOB uses alteration project categories. ALT1 generally relates to major alterations including changes in use, occupancy or egress. ALT2 generally applies to multiple work types without a change in use, occupancy or egress. ALT3 generally applies to limited work of smaller scope. The terms are a starting reference, not an independent classification; the owner’s architect/engineer should assess actual existing conditions and scope.

DOB NOW Alteration and Alteration-CO

An Alteration filing and an Alteration-CO route are not interchangeable. A change of occupancy or use may raise separate review and certificate-of-occupancy questions. Have the architect/engineer confirm the appropriate NYC DOB filing path and required submissions for the specific property and work.

Permit and asbestos records

Permit needs depend on the filing and work involved. Asbestos documentation may also be required; the owner and design professional should confirm whether ACP-5 or another record is applicable before permit steps proceed. Consult current DOB and DEP requirements rather than relying on a general checklist.

Who coordinates which decisions

The owner authorizes scope and engages the project team. The architect/engineer develops design and establishes professional filing responsibilities. The building supplies property procedures and any owner/management review. The contractor coordinates construction scope to the current approved documents. Agency determinations remain with the city and responsible professionals.

Commercial project coordination pages