Certificate of Occupancy
A certificate of occupancy (CO) is a legal document issued by the local building department certifying that a commercial space has been inspected, meets all applicable building codes, and is approved for its intended occupancy classification and use. Without a CO, a business cannot legally open to the public. The CO is the final checkpoint in the permit and inspection process.
Updated July 13, 2026
Key Facts
- 1A CO is required before any commercial business can legally operate — opening without one exposes the owner to fines, forced closure, and personal liability
- 2Obtaining a CO typically requires passing final inspections for building, electrical, plumbing, mechanical, and fire suppression systems — each a separate inspection event
- 3For food service businesses, a CO from the building department is separate from — and in addition to — health department permits and food service licenses
How to Get a Certificate of Occupancy
The CO process begins with a permitted set of construction documents (architect-stamped drawings approved by the building department). As construction proceeds, inspectors visit the site at key milestones: rough-in inspections for MEP systems, framing inspections, insulation inspections, and finally the comprehensive final inspection when construction is complete.
At final inspection, the building inspector verifies that the space is built as approved, that all required systems are installed and operational, that egress is clear and code-compliant, that life safety systems (smoke detectors, sprinklers, exit lighting) work, and that ADA-required elements are in place. A passing final inspection triggers issuance of the CO.
Temporary CO vs. Final CO
In some jurisdictions, a temporary certificate of occupancy (TCO) allows the tenant to open for business while minor punch list items are still being resolved. A TCO is typically valid for 30–90 days and requires the final CO to be obtained before the TCO expires. TCOs can be invaluable for businesses trying to open for a specific season or event without waiting for every last paint touch-up.
Frequently Asked Questions
How long does it take to get a certificate of occupancy?
The timeline depends on how smoothly the inspection process goes and the jurisdiction's scheduling backlog. In well-managed projects with passing inspections, the final CO can be issued within 1–2 weeks of construction completion. In complex projects with multiple failed inspections or busy building departments, it can take 4–8 weeks.
What causes CO delays?
Failed inspections (requiring corrective work and re-inspection), incomplete punch list items at final inspection, missing documentation (fire suppression certification, elevator inspection certificate, health department sign-off), and building department backlogs are the most common causes.
Can I use a space without a CO?
No. Using a commercial space without a CO is illegal and can result in fines, forced evacuation, lease termination, and personal liability if an injury occurs. Your business insurance may also be void if you operate without a CO.
Is the CO different for different business types?
Yes. The CO specifies the occupancy classification of the space (A-2 for restaurants, M for retail, B for general office, etc.). If you change the use of the space — for example, converting a retail store to a restaurant — you must apply for a new CO for the changed occupancy classification. This typically triggers a full plan review and inspection.