To get a certificate of occupancy, you apply to your local building department after construction or renovation is complete, pass a final inspection that confirms the building matches the approved plans and meets code, and receive the signed document from the building official. The work that decides whether you pass happens well before the inspector shows up: closing out every trade permit, gathering the right paperwork, and finishing the site so nothing is missing on the day.
Confirm Your Project Needs One
Under the International Building Code, which most jurisdictions adopt in some form, no new building may be occupied until the building official issues a certificate of occupancy. If a building permit was pulled, a CO is almost always the final step before the space can be used.
Beyond new construction, three other situations commonly trigger the requirement. Major renovations that alter structure, fire-protection systems, or exit routes generally require a new or amended CO, though cosmetic work like repainting or replacing flooring usually does not. A change of occupancy — turning a warehouse into a restaurant, or a house into an office — requires a new CO because different uses carry different fire-safety, accessibility, and structural standards.1International Code Council. 2024 International Existing Building Code Chapter 10 – Change of Occupancy Some jurisdictions also require an updated CO whenever a new commercial tenant moves in, even when the use stays the same.
Rules vary locally. A few jurisdictions waive the formal CO for certain minor residential projects and instead issue a certificate of final inspection or certificate of completion. Call your building department before construction wraps up if you are not sure which document your project needs.
Gather Your Documentation
The application form itself is usually short. The supporting paperwork is what takes time, and a missing piece can stall everything. Plan on assembling:
- The stamped set of approved building plans the department issued with your permit. The inspector compares the finished building against these, so any deviations should already have been handled through plan revisions.
- Trade permits and inspection records for electrical, plumbing, mechanical, and fire-suppression work. Each has its own inspections, and every one must show a passing result before a CO can issue.
- Stage inspection sign-offs — foundation, framing, insulation, and plumbing and electrical rough-ins. These all need to appear as approved in the department’s records.
- Agency clearances specific to your project. A restaurant, for example, needs health department approval in addition to the standard building inspections; some projects also need fire marshal or environmental sign-offs.
Open permits are the classic surprise. If prior work on the property was permitted but never closed out, most building departments will not process your CO application until those are resolved. A quick records search at the building department before you apply will surface them early. Sometimes older owners are involved; sometimes walls have to be opened so an inspector can verify what is behind them. Better to find that out now than after you apply.
Get the Site Ready
The final inspection is not a formality. The inspector walks the entire property comparing what was built against the approved plans and current code. Anything incomplete or inconsistent can produce a failed inspection and a return visit.
Before you schedule, confirm construction is genuinely finished. Finishes, fixtures, and safety features all count. Smoke detectors and carbon monoxide detectors need to be installed in every required location. Exit paths must be clear, marked, and lit where required. Electric, water, gas, and sewer must all be connected and working.
Exterior items fall within scope too: grading, drainage, sidewalks, ramps, and handrails. Landscaping tied to the approved site plan may need to be complete as well, though some jurisdictions will allow a temporary CO when landscaping is the only outstanding item.
Many building departments publish an inspection checklist tied to your permit type. Working through that checklist before the inspector arrives is the single most effective way to avoid a failed visit.
Apply and Pass the Final Inspection
Once your paperwork is in order and the site is ready, submit the CO application to your local building department. Most jurisdictions accept applications online, in person, or by mail. Fees vary widely: small residential projects may cost a few hundred dollars, while large commercial buildings can run into the thousands. The department’s fee schedule is usually posted online.
After the application is accepted, you schedule the final inspection. In most places you can get on the calendar within one to two weeks, though busy departments in fast-growing areas can run longer. The inspector will check:
- Plan compliance — whether the finished building matches the approved plans in layout, dimensions, and materials.
- Structural integrity — load-bearing elements, connections, and foundations consistent with the engineered design.
- Electrical, plumbing, and mechanical systems — installed to code, labeled, and functional.
- Fire safety — sprinklers where required, alarms, extinguishers, smoke detectors, and exit signage in place and working.
- Accessibility — the requirements that apply to the building’s occupancy type.
When the inspection passes, the building official issues the CO. The document will include the permit number, the building address, the approved use and occupancy classification, the construction type, and the design occupant load, along with other project details.2International Code Council. 2024 International Building Code Section 111.2 – Certificate Issued
If the Inspection Fails
Failed inspections are common and manageable. The inspector leaves a written list of deficiencies that must be corrected before a CO can issue.
Minor items — a missing outlet cover, a smoke detector in the wrong spot, a door swinging the wrong way — are quick fixes. Major items involve structural problems, code violations in fire-safety systems, or significant departures from the approved plans, and can require additional permits or engineering review before you can schedule again.
Once every item is corrected, you request a re-inspection. Most jurisdictions charge a re-inspection fee, typically between $50 and $150. The follow-up focuses on the specific deficiencies from the first visit, though an inspector who notices new issues can flag them.
When a Temporary CO Makes Sense
If the building is substantially complete and safe to occupy but a few outstanding items remain, the building official can issue a temporary certificate of occupancy. The International Building Code authorizes a TCO when the completed portions can be “occupied safely” even though the full permitted scope is not finished.2International Code Council. 2024 International Building Code Section 111.2 – Certificate Issued
Typical situations include unfinished landscaping, incomplete exterior painting, or cosmetic punch-list items that pose no safety hazard. A TCO will not be issued when life-safety systems, structural elements, or fire-protection features are incomplete.
Every TCO carries an expiration date set by the building official. Ninety days is common, and some jurisdictions go up to six months. Extensions are usually available for an added fee but are not guaranteed. If the TCO expires before the work is finished and a permanent CO is in hand, occupancy becomes illegal. Treat the date as a hard deadline.
After You Receive the Certificate
A CO does not expire on its own, but it can become invalid. Future work that changes the building’s structure, safety systems, or occupancy classification triggers the need for a new or amended CO.1International Code Council. 2024 International Existing Building Code Chapter 10 – Change of Occupancy Adding a second story, converting a garage into living space, or switching a retail space to a restaurant sends you back through permitting and inspection.
Store the CO with your deed, survey, and insurance policy. You will need it when selling, refinancing, or applying for future building permits. If your copy is lost, the building department has the original on file and can usually provide a duplicate for a small fee.