Code: Amended CO (Updated building occupancy document)
Description: (Amended Certificate of Occupancy) is an updated DOB document that records approved changes to an existing building’s legal use, occupancy, or means of egress. It updates the building’s occupancy record rather than simply confirming that construction work is complete.
Practical Meaning: If you plan to change your building’s use, number of apartments, or exit arrangements, ask your architect or engineer whether a new or amended Certificate of Occupancy is required. A work permit alone does not update the building’s legal occupancy record.
Where You May See It: You may see “amended Certificate of Occupancy” in DOB alteration requirements, project documents prepared by your architect or engineer, and guidance about changes to an existing building’s use or occupancy.
Why It Matters: An amended Certificate of Occupancy documents the building’s approved use and occupancy after changes that affect its existing certificate. Do not confuse it with a Letter of Completion, which closes qualifying work that does not require a new or amended Certificate of Occupancy.