When do you need a new Certificate of Occupancy in NYC?

Three cases: new construction (every new building needs a CO), major alterations (adding a unit, changing use, significantly altering layout), and pre-1938 buildings where existing CO doesn't match current use. Routine homeowner renovations typically don't need a new CO.

What is a Temporary Certificate of Occupancy (TCO)?

A TCO lets you occupy while final paperwork is pending. Issued for 90 days at a time, renewable. New developments often run on chained TCOs for years before the Final CO. For a homeowner, the TCO is what lets you move in when construction is functionally done but a few permits are still open.

How long does the NYC CO process take?

Routine alteration where construction is complete: 4-12 weeks. New construction or major alteration: 6-18 months. The bottleneck is scheduling DOB inspections — 4-8 weeks per inspection in peak season.

What if my NYC property doesn't have a CO?

Two paths. (1) Building has a CO that doesn't match current use — file an amendment after legalizing the unpermitted work. (2) Building never had a CO — file for new CO with full plans and inspections. Path 2 can be expensive (sprinkler retrofits, ADA, energy upgrades).

How can I check if a NYC property has a current CO?

Use DOB BIS (a1868bis.nyc.gov) or DOB NOW (a810-dobnow.nyc.gov/Publish/). Search by address — CO history is public record. PermitGrab's NYC permit feed pulls daily DOB filings.

How can I find NYC contractors who close COs successfully?

NYC permit data shows the contractor of record on every alteration. PermitGrab indexes NYC permits with contractor business names + 466+ verified contractor phone numbers from the NY DOL state license database. Filter by alterations that closed with a CO in the last 6 months. Free signup, 10 reveals.

How Much Does a Certificate of Occupancy Cost in NYC?

By Marcus Reeves, Head of Permit Research at PermitGrab · Updated daily from official city records · Last permit filed: today

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A Certificate of Occupancy (CO) in New York City typically costs $100-$500 in DOB filing fees for residential properties, and $500-$2,000+ for commercial. Those numbers don't include the work that has to be done before the CO is issued — final inspections, plan-approved alterations, and any outstanding violations cleared. The full out-of-pocket cost from "starting renovation" to "CO in hand" runs from a few hundred dollars to tens of thousands depending on project scope.

What is a Certificate of Occupancy?

A Certificate of Occupancy is a document issued by the NYC Department of Buildings (DOB) that legally allows a building (or a unit within it) to be occupied. It certifies that the structure complies with the NYC Building Code and Zoning Resolution. Three situations require a new or amended CO:

New construction. Every newly-built building needs a CO before anyone can move in.
Major alterations. Adding a unit, changing the use (office to residential, etc.), or significantly altering the layout.
Pre-1938 buildings. Some pre-1938 buildings never had a CO issued because they predate the requirement. If you alter one substantially, DOB will require you to obtain a "Letter of No Objection" or pursue a new CO.

Most NYC apartment dwellers and homeowners never directly pay for a CO because the building's CO covers the unit. You only deal with CO costs if you're doing a major alteration, building new, or buying a property where the existing CO doesn't match current use.

DOB filing fees for a CO (2026)

The CO filing fee itself is one of the cheaper parts of the process. As of 2026:

Temporary Certificate of Occupancy (TCO): $100 per application
Final Certificate of Occupancy: $100 per application
Amended CO (small changes to existing): $135
Letter of No Objection (pre-1938 buildings): $100

These are direct DOB fees. They're tiny compared to the work the CO certifies.

The real cost: everything that has to happen before DOB issues the CO

To get a CO, every permitted alteration must be inspected and signed off. That means closing out every permit on the property:

Plan-approved alterations: Plans must be drawn by a NY-licensed architect or engineer and filed with DOB. Plan filing fees alone run $200-$1,500 depending on project scope; architect fees typically $5,000-$50,000+ for a substantial renovation.
All inspections pass: Plumbing, electrical, structural, fire-alarm, sprinkler — each requires a separate inspection. Inspection sign-offs are bundled into your permits.
No open violations: DOB violations, ECB violations, HPD violations all must be cleared. Each cleared violation can cost $0 (paperwork-only fix) to thousands (correcting unpermitted work).
Final survey by a licensed surveyor: Typical cost $500-$2,000.
Sign-offs from FDNY (fire department) for sprinkler/alarm if applicable: $300-$1,500.

Practical example: a typical NYC condo combination (combining two units into one) carries about $30,000-$80,000 in pre-CO costs (architect, expediter, filing, surveyor, FDNY) on top of construction. The CO itself is the cheap part.

Temporary vs Final Certificate of Occupancy

A Temporary CO (TCO) lets you occupy while final paperwork is still in progress. They're issued for 90 days at a time and can be renewed. New developments often operate on chained TCOs for years before the Final CO is issued. For a homeowner, the TCO is what lets you move in when the building is functionally complete but a few permits are still outstanding.

What if I don't have a CO and need one?

Two paths. (1) The building has a CO but it doesn't match current use (e.g., illegal basement conversion). You file an amendment after legalizing the work. (2) The building never had a CO. You file for a new CO with full architectural plans and inspections.

Path 2 in particular can be expensive. The DOB requires you to bring the entire building up to current code where you've altered it — sometimes triggering retroactive sprinkler installation, ADA compliance, or energy code upgrades that can run six figures for a brownstone. Hire a competent NYC expediter before going down this path.

How long does the CO process take?

For a routine alteration where construction is already complete: 4-12 weeks. For new construction or major alterations: 6-18 months from filing to Final CO. The bottleneck is usually scheduling DOB inspections, which can take 4-8 weeks per inspection in peak season.

How can I check the existing CO for a property?

Use the DOB BIS system (a1868bis.nyc.gov) or the newer DOB NOW portal (a810-dobnow.nyc.gov/Publish/). Search by address — the CO history is public record. PermitGrab's NYC permit feed also pulls daily DOB filings so you can see permit activity in any building.

How much does the contractor cost on top of the CO process?

That's the other major line item. NYC construction labor is ~30-50% above national average. For permitted residential work, expect $250-$600 per square foot for a thorough renovation. Don't budget the CO process without budgeting the actual construction.

How can I find contractors who've successfully closed COs in NYC?

NYC permit data shows you the contractor of record on every alteration. PermitGrab indexes NYC building permits with the contractor business name attached, plus 466+ verified contractor phone numbers from the NY DOL state license database. Filter by alterations that closed with a CO in the last 6 months to find contractors who actually finish projects. Browse NYC permits and try 10 free phone reveals on the page — no signup, no card.

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