A certificate of occupancy (CO) is the city’s formal statement that a building is safe and legal to occupy for its stated use. New buildings need one before anyone moves in; changing a building’s use usually triggers one too. Here is how COs work in Arizona, and what the records show.
Counts measured against live AZ permit data, August 2026
What a CO actually certifies
The CO closes the loop the building permit opened: it certifies the completed building complies with the approved plans and the code for a specific use and occupancy classification — retail, restaurant, warehouse, dwelling. It is issued by your AHJ (the city building department) after final inspections pass. No CO, no legal occupancy.
It is not the same thing as a passed final inspection on a remodel. Ordinary remodel and trade permits close with a “final”; a CO is a separate instrument tied to occupancy and use, chiefly for new buildings, shell buildouts, and changes of use.
When Arizona projects need one
The recurring triggers: a newly constructed building (residential or commercial), a tenant improvement that creates a new occupiable space, and a change of use — the classic Arizona examples being a retail suite becoming a restaurant or a warehouse adding offices. Business licenses in many Arizona cities require showing the CO for the space, which is where tenants most often discover one is missing.
In the last 12 months our statewide data shows 280 permits explicitly labeled as certificate-of-occupancy records, with a median declared project value around $389,000 — overwhelmingly commercial, which matches how cities file them: many issue the CO as an outcome of the building permit rather than a separately published record, so the labeled count is a floor, not the universe.
Temporary COs and common snags
Cities issue temporary COs (TCOs) to let occupancy begin while punch-list items close — common on commercial projects with hard opening dates. The snags that delay a CO are predictable: open sub-permits (an unfinaled electrical or mechanical permit blocks the CO), unresolved fire-inspection items, and site work like accessibility routes. If you are buying or leasing, verifying the CO and that its use matches yours is a five-minute check that prevents an expensive surprise.
Check a building’s permit history
Open permits block COs and closings — see every permit on file at any Arizona address, free.
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Frequently asked questions
What is a certificate of occupancy?+
The city’s formal certification that a completed building complies with code for a specific use and may legally be occupied. Issued by the local building department after final inspections.
When is a CO required in Arizona?+
New buildings before occupancy, new occupiable tenant spaces, and changes of use (e.g. retail to restaurant). Ordinary remodels close with a final inspection instead.
Is a CO the same as a final inspection?+
No — a final inspection closes a permit; a CO is a separate occupancy instrument. New construction needs both: finaled permits and then the CO.
What is a temporary certificate of occupancy (TCO)?+
A time-limited CO allowing occupancy while remaining punch-list items are completed — common on commercial projects with fixed opening dates.
What blocks a CO from being issued?+
Most often: open sub-permits that never got finaled, outstanding fire-inspection items, and incomplete site/accessibility work. Checking a property’s open permits surfaces these early.
How do I check a building’s permit and CO history?+
Search the address on PlumbIntel — the property’s permit records, statuses, and contractors appear free. For the CO document itself, the issuing city’s records office is the authoritative source.
Chris Brannan· Founder, Plumb Intelligence
Founder of Plumb Intelligence. Building the honest layer over Arizona’s public construction records — permits, parcels, licenses, and sales, fused and measured daily from Gilbert, AZ.
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