A short list of NYC DOB Certificates
In New York City building compliance, certificates, inspection records, and sign-offs are important documents connected with the Department of Buildings (DOB*). Some are issued by DOB, while others are prepared by approved inspection agencies or other City agencies. Homeowners and landlords may encounter several types. The Certificate of Occupancy (CO) is one of the most important because it states the building’s legal use and permitted occupancy. This entry gives a short overview of common documents and links to more detailed explanations in our Dictionary.
Certificate of Occupancy
A Certificate of Occupancy* (CO) is an official NYC Department of Buildings document that states a building’s legal use and/or permitted type of occupancy. New buildings must have a CO. An existing building must have a current or amended CO when work changes its use, egress, or type of occupancy. No one may legally occupy a building until DOB issues a final CO or a Temporary Certificate of Occupancy (TCO). A final CO does not expire, but it may need to be amended when a later project changes information covered by the CO.
Amended Certificate of Occupancy
An Amended CO is an updated Certificate of Occupancy issued by the NYC Department of Buildings to reflect approved changes to an existing building’s legal use, egress (exit arrangements), or type of occupancy. An existing building must have a current or amended CO when alterations change these conditions. For example, converting residential space to commercial use may require an amended CO.
An amended CO is not a renewal of an expired certificate—a final CO does not expire. It updates the building’s approved occupancy information. Not every renovation requires an amended CO; minor alterations that do not require a new or amended CO may receive a Letter of Completion instead.
Temporary Certificate of Occupancy (TCO)
A Temporary Certificate of Occupancy (TCO) is a short-term DOB document that allows occupancy when DOB determines the property is safe to occupy but some issues must still be resolved before a final CO can be issued. A TCO typically expires 90 days after issuance. If the remaining issues are not resolved before it expires, the owner may need to apply for a renewal or obtain a final CO before continued occupancy.
Certificate of Compliance
A Certificate of Compliance is an official document that confirms a specific item, system, installation, or required inspection and test has met applicable DOB requirements. Its exact purpose depends on the DOB program involved. It may be required before equipment can legally operate, after certain work is completed, or to show that a cited condition has been corrected.
Elevator Inspection Certificate and Certificate of Compliance
NYC elevators must be inspected and tested on a regular schedule. The elevator inspection certificate is the document occupants may see in the elevator cab or in the building manager’s office. It helps identify the elevator and shows inspection information.
An Elevator Certificate of Compliance is different. It is a DOB certificate that authorizes an elevator to operate after DOB receives a satisfactory inspection and test report. It is especially important for a newly installed elevator and may also be relevant after certain elevator work or required testing. A Certificate of Compliance does not replace future inspections, tests, maintenance, repairs, or required filings.
Boiler Inspection Records
Many NYC boilers must be inspected and reported to DOB on a regular schedule. Boiler* compliance records can include inspection reports, defect-correction filings, audit records, violation notices, and maintenance documents. The exact inspection, filing, and posting requirements depend on the boiler type, capacity, building use, and applicable DOB rules.
Other certificates and notices
Some building-related notices, inspection records, and required postings are issued by City agencies other than DOB, such as the Department of Housing Preservation and Development (HPD) or the Fire Department (FDNY). These documents may be displayed in lobbies, boiler rooms, mechanical spaces, or management offices, but they are not automatically DOB certificates and may have separate rules.
Each document has a different purpose. Check whether it must be posted, filed, renewed, updated, or kept in your records. Some documents expire, such as a TCO, while a final Certificate of Occupancy does not expire.
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This page is for general education only and is based on public New York City sources when available. Some technical and legal terms are simplified into plain English to help homeowners and ESL readers. It is not legal advice, and it does not replace guidance from a licensed professional. NYC construction and safety rules change often, and your project may have extra DOB*, OSHA, or local requirements. Before you start work, always check current rules with a licensed design professional or directly with the NYC Department of Buildings.
If you see any capital letter abbreviations on this page or in an official letter you received from the city and you do not understand them, you can try to look them up on our NYC Violation Codes HUB page with the search tool.
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