Certificate of Occupancy: Requirements and Process
Learn when a certificate of occupancy is required, which inspections come first, how a temporary CO differs, and what can block issuance.
Direct answer
A certificate of occupancy, or CO, is the building authority's record of approved legal use or occupancy and, when required, authorization to occupy after construction, inspections, paperwork, fees, and agency approvals are complete.
A temporary certificate of occupancy may allow a safe portion of the project to be occupied while limited closeout items remain. A TCO is conditional and often expires.
Common triggers
- New buildings
- Major additions or alterations
- Changes in use or occupancy classification
- Changes affecting exits or occupant load
- New dwelling units or tenant spaces
- Projects that change the legal occupancy record
Building permit vs. CO
A building permit authorizes construction. A CO authorizes occupancy or confirms legal use. A final building inspection may be required but may not be sufficient by itself.
Closeout process
- Confirm the required occupancy document.
- Complete permitted construction.
- Submit revisions and deferred items.
- Complete building and trade finals.
- Complete fire and life-safety acceptance.
- Complete accessibility, zoning, elevator, utility, and agency sign-offs.
- Resolve corrections, violations, and fees.
- Submit the occupancy request.
- Receive and verify the document before occupancy.
Final CO vs. temporary CO
| Feature | Final CO | Temporary CO |
|---|---|---|
| Purpose | Final occupancy authorization | Conditional occupancy |
| Outstanding work | No blocking work | Limited non-safety items may remain |
| Duration | Remains record until amended | Time or condition limited |
| Renewal | Normally not needed | May require renewal |
| Risk | Must match approved use | Expires if conditions are not resolved |
What can block issuance?
- Failed or incomplete inspections
- Work not matching approved plans
- Missing trade sign-offs
- Incomplete life-safety systems
- Missing surveys, testing reports, or record documents
- Open violations
- Unpaid fees
- Unresolved zoning or agency conditions
- Unapproved change of use
Property due diligence
Compare the CO or legal-use record with actual use, dwelling count, occupied areas, additions, conversions, and the current permit history.
Older buildings may rely on another recognized legal-use record rather than a modern CO.
Checklist
- Confirm issuing authority
- Confirm required document
- Verify approved use and occupancy classification
- Complete construction and revisions
- Complete building and trade finals
- Complete fire, elevator, accessibility, zoning, and agency approvals
- Resolve violations and fees
- Review TCO scope and expiration
- Receive and retain the final record
How GovCodex helps
GovCodex can locate the official application, organize required sign-offs, review permit and inspection records, compare legal use with a proposed use, and build a closeout checklist.
Check occupancy and closeout requirements.
Frequently asked questions
Is a CO the same as a building permit?
No. The permit authorizes construction; the CO authorizes occupancy or confirms legal use.
Is a final inspection the same as a CO?
Not always. Other trade, fire, accessibility, zoning, agency, fee, and document conditions may remain.
What is a TCO?
A conditional, time-limited occupancy authorization for an approved safe area.
Can a final CO expire?
A final CO generally remains the legal-use record until amended, replaced, suspended, or revoked. A TCO commonly expires.
Sources
- Certificate of Occupancy — New York City Department of Buildings; local requirements vary by authority and proposed occupancy.
Related GovCodex guides
Visual guides
Last reviewed: July 29, 2026. Requirements vary by jurisdiction and property.
What this permit is
Official authorization for an identified use or occupancy after applicable approvals, inspections, and closeout requirements
Category: Building
Workflow: Certificate and closeout
Jurisdiction level: Municipal (City / Village / Town)
Official closeout or use authorization after the applicable approvals and inspections.
Also known as: Certificate of Occupancy, COO, CO, Occupancy Permit, Certificate of Use, Use and Occupancy Certificate, Temporary Certificate of Occupancy, TCO
What you need
- Related permit number, property, proposed use, and responsible contact (Commonly required)
- Required final, trade, fire, accessibility, or other closeout approvals (Verify locally)
- As-built, testing, or closeout documents requested by the issuing department (Verify locally)
This is a general workflow, not a finding about a particular property. Verify each locally marked item against the current official application, ordinance, and issuing department.
How to apply
- Confirm whether a new use, change of use, completed project, or temporary occupancy requires a certificate
- Identify the issuing department and every prerequisite inspection or approval
- Complete required inspections and resolve open corrections (Commonly required)
- Submit the certificate request or application with the related permit and use information (Commonly required)
- The authority issues the certificate or identifies remaining deficiencies
- Confirm whether the authority issued a final certificate or a temporary certificate with limits, conditions, and an expiration date (Verify locally)
- When a certificate is required, do not occupy beyond the scope and date the issuing authority has authorized
Timing
Check the current application deadline, review calendar, and completeness rules published by the responsible jurisdiction. No supported national processing-time estimate is available.
Fees
Consult the responsible jurisdiction’s current application and fee schedule. No supported national fee range is available.
Official sources
These dated local sources support the workflow distinctions in this general guide. They do not establish the rules for your property; verify the current source published by your responsible authority.
- Certificate of Occupancy — New York City Department of Buildings (New York City, NY; checked 2026-07-22). Local primary-source example showing final sign-offs and closeout conditions; requirements vary by authority and proposed occupancy.
- Permit & Development Center — City of Milwaukee Department of Neighborhood Services (Milwaukee, WI; checked 2026-07-01). Local example for occupancy-certificate routing and closeout; requirements vary by authority and proposed use.
Related permits
Building Permit
Required for new construction, major renovations, additions, and structural alterations
Electrical Permit
Required for electrical work including wiring, circuits, panels, and electrical installations
Plumbing Permit
Required for plumbing work including water supply, drainage, fixtures, and gas lines
Mechanical Permit
Required for HVAC systems, furnaces, air conditioning, and ventilation work