Certificate of Occupancy (CO)
Approval that a building is safe for use. For accessory work, a final approval closes the permit.
Applies to
New homes · Additions that create occupiable space · Changes of use · Some major remodels
Project example
A new dwelling cannot be occupied merely because construction looks finished; the AHJ may require final trade approvals, address numbers, grading, life-safety items, and outstanding fees first.
Also called
Where this term shows up in permit work and how it affects the project
The certificate documents that the approved use may begin and is often the final dependency for occupancy, financing, turnover, or sale.
If this term appears in a form, plan comment, or local ordinance, start with the building permit guide, compare it against the zoning permit guide, then use the permit guide directory to find the right local path.
Why certificate of occupancy (co) matters in a permit file
A certificate of occupancy or comparable final authorization documents that a building or space may be occupied for the approved use. Requirements vary by project: some minor permits close with a final inspection, while new buildings and changes of use may require a formal certificate.
Where it appears in the permit process
Occupancy classification
The permit record identifies the approved use, occupant conditions, project scope, and whether a new or amended certificate is required.
Department clearances
Building, zoning, fire, health, utilities, public works, and separate trades complete their required reviews and inspections.
Final documentation
As-builts, test reports, certifications, energy documents, addresses, fees, and correction closures are submitted as required.
Issuance or temporary occupancy
The AHJ issues final or temporary authorization with any limitations, expiration, phased area, or remaining condition stated in writing.
What you may need
- All final inspection approvals and closed correction notices
- Approved use, occupancy, life-safety, and accessibility documentation
- Required test reports, certificates, as-builts, and design-professional letters
- Zoning, fire, health, utility, and public-works clearances
- Final application, fee, owner information, and address documentation
Where to get it or verify it
- Use the building department's closeout or certificate checklist and confirm whether other agencies release their approvals separately.
- Ask whether the project needs a certificate, final approval, letter of completion, or another local closeout document.
- Get required system tests and professional certifications from the responsible licensed installer or design professional.
Common mistakes that create comments or delays
- Scheduling move-in because construction appears complete
- Passing the building final while trade or fire permits remain open
- Requesting temporary occupancy without a written plan for remaining work
- Losing final approvals, test reports, or the issued certificate after turnover
What to do next
- Create the closeout checklist at permit issuance, not at the end.
- Track every department, trade, test, fee, and correction to recorded completion.
- Request final or temporary occupancy through the required written process.
- Deliver the certificate and complete permit record to the owner and retain it with project files.