Awaiting expert review. This page covers safety or regulatory rules that change over time. It is kept out of search results until a qualified reviewer has checked it; the sources below are dated so you can verify each point.
Quick answer
A certificate of occupancy (CO) is a document issued by the local building official, after inspection, stating that a building or a described part of it complies with the adopted code and may legally be used for its stated purpose.
New homes, additions, converted spaces and changes of use usually need one. Many interior remodels end instead with a passed final inspection, because the house already has a lawful use.
Quick facts
The key facts about Certificate of Occupancy, with sources:
- Issued by
- The building official, after inspection finds no violations 1
- Not required for
- Work exempt from permits; accessory buildings (IRC exceptions) 1
- Temporary version
- Temporary CO for safe portions, valid for a set time 1
- Can be revoked
- If issued in error, on wrong information, or for a violation 1
- States the code edition
- Yes, the edition the permit was issued under 1
- Expiration (one city’s rule)
- New York City: a CO has no expiration date 4
Key takeaways
- A certificate of occupancy is the official OK to use a building, or part of it, for a stated purpose.
- In the model code, no one may occupy a building or change its use until the building official issues one.
- Exempt finish work and accessory buildings do not need one under the IRC exceptions.
- Most remodels inside an existing home close with a final inspection; additions, conversions and changes of use are where a CO matters most.
- A temporary CO lets safe parts be used before all work is done, for a time the official sets.
What a certificate of occupancy means
Think of a CO as the building department’s statement that a space is fit to use for a named purpose. It comes at the end, after the final inspection, and it describes exactly what was approved.
The 2021 International Residential Code (IRC) sets the rule in Section R110.1.
A building may not be used or occupied, in whole or in part, and its occupancy may not be changed, until the building official has issued a certificate of occupancy 1.
Two exceptions follow: work exempt from permits under R105.2, and accessory buildings or structures 1.
The same section adds a guardrail. A CO is not approval of any code violation, and a certificate that claims to allow one is not valid 1. In other words, a CO confirms what the inspector saw; it does not excuse what was hidden.
One city’s plain-language version helps. New York City’s Department of Buildings says a CO states a building’s legal use or type of permitted occupancy, and that existing buildings need a current or amended CO when there is a change in use, egress or type of occupancy 4.
How a CO is issued
In the model code, the certificate is the last step of the permit process.
- The permit is issued for work that needs one 1.
- Inspections happen in sequence, from rough-in to final 1.
- The final inspection passes after the permitted work is complete and before occupancy 1.
- The building official issues the certificate after inspecting and finding no violations of the code or other laws the department enforces 1.
- The certificate is kept on record. The building official keeps records of permits and certificates issued 1.
- PermitWork authorized (R105)
- InspectionsRough-in, frame, others (R109)
- FinalWork complete, before use (R109.1.6)
- CertificateIssued if no violations found (R110.3)
Order from the 2021 IRC. Your jurisdiction may add steps, such as sign-offs from other agencies. Source: [1]
Types of occupancy approvals you may meet
| Approval | What it means | Basis |
|---|---|---|
| Certificate of occupancy | The building or described part may be used for its stated purpose | 2021 IRC R110.1 and R110.3 1 |
| Temporary certificate of occupancy (TCO) | Safe portions may be used before all work is done, for a set period | 2021 IRC R110.4; IEBC 110.3 1 2 |
| Certificate for a change of occupancy | Needed before a building or part of it changes use | 2021 IEBC 110.1 2 |
| Final inspection sign-off | The permitted work passed; often the close-out for an interior remodel | 2021 IRC R109.1.6 1 |
| Letter of Completion (New York City) | Close-out for minor alterations that do not need a new or amended CO | NYC Department of Buildings 4 |
| Letter of No Objection (New York City) | Confirms legal use for buildings built or altered before 1938 that never needed a CO | NYC Department of Buildings 4 |
Example: does this remodel end with a new CO?
These calls apply the 2021 IRC and IEBC model text 1 2 3. They are not a local ruling. Your building department decides, and many issue a CO or an amended one in cases the model code leaves open.
| Project | Likely close-out under the model code | Why |
|---|---|---|
| Kitchen remodel, same rooms, new wiring and plumbing | Final inspection; usually no new CO | The house already has a lawful use; this is an alteration 3 |
| New cabinets and countertops only | No permit, so no CO | Exempt finish work; CO not required for permit-exempt work 1 |
| Two-story addition | Final, and often a CO or amended CO for the new space | New space may not be used until approved 1 |
| Garage converted to a bedroom | Ask about a CO; use of the space changes | Changes in use follow IEBC rules (IRC R110.2) 1 |
| Detached accessory dwelling unit | Expect a CO for the new dwelling | A new dwelling is occupied for living; accessory-building exception covers sheds and garages, not homes 1 |
| New detached shed | No CO under the IRC exception | Accessory buildings are excepted 1 |
If your remodel changes how a space is used, adds a dwelling unit or adds floor area, ask the building department at permit time whether a new or amended CO will be issued. Planning an ADU? See our accessory dwelling unit service page.
What the certificate itself lists
The 2021 IRC lists what a certificate must contain 1. If you are buying a house, refinancing or closing out an addition, this is what to look for on the document.
Two items on that list often surprise owners. The certificate names the code edition the permit was issued under, which matters years later when someone asks what rules applied. It also carries any special stipulations or conditions of the building permit 1.
Certificates are public records in many places. New York City, for example, lets anyone search a property and print its CO 4. Other departments keep them in permit files you can request.
- The permit number
- The address of the structure
- The name and address of the owner or owner’s authorized agent
- A description of the part of the structure covered
- A statement that the described part was inspected for code compliance
- The name of the building official
- The code edition the permit was issued under
- Whether an automatic sprinkler system is provided and required
- Any special stipulations and conditions of the permit
Source: [1]
Final inspection and certificate are two different things
The final inspection is the inspector’s visit; the certificate is the document that follows when one is required. An interior remodel can pass its final and close its permit with no new certificate, while an addition or conversion usually needs both 1.
Why a CO helps you, and what it takes
What it gives you
What a certificate of occupancy does not prove
A CO is not a warranty. It says the inspector found no violations at final inspection, not that every hidden detail is right or that finishes will last. Quality is covered by your contract and the contractor warranty.
A CO also does not cover work done later. If someone finishes a basement after the certificate was issued without a permit, the CO says nothing about that space. And a CO cannot make a violation legal; the model code says so in plain words 1.
What drives the cost and time of getting a CO
We do not list fees; each jurisdiction sets its own 1. Some departments fold the certificate into the permit fee. Others charge for it, or for a temporary certificate.
The bigger costs are time and holding costs. A CO waits on every inspection, every correction and, in some cities, other agencies. New York City, for instance, will not issue one while any applications or violations are open on the property 4. A late correction can push move-in back.
How long it lasts depends on the place. New York City says a CO has no expiration date 4. A temporary certificate does expire, on a date the building official sets 1.
Getting to a CO on an addition or conversion
Owner-level steps; your contractor and the building department handle the technical parts.
- At permit time, ask whether the job will end with a new CO, an amended CO or a final sign-off.
- Keep every inspection result and correction notice together.
- Make sure the final inspection is scheduled only when all work is complete 1.
- Clear any open permits or violations on the property; some cities require it 4.
- If you must move in early, ask whether a temporary certificate is available for the safe parts 1.
- Get the certificate in hand before final payment, if your contract allows.
For the whole permit path, including plan review, see our permits and approvals guide.
Keeping your CO current
A certificate needs no upkeep, but the use it describes must stay true.
- Keep a copy with your deed and permit records.
- Check it before a sale; buyers and lenders may ask for it.
- Before converting a space to a new use, ask whether an amended CO is needed 2.
- If you find unpermitted work, ask the department how to permit it so the record matches the house.
Warning signs and risks
- Moving into an addition before it is approved. The model code bars use or occupancy until the certificate is issued 1.
- A seller cannot show a CO for an addition or converted unit. Ask for permit and final records.
- A temporary certificate is about to lapse. It is valid only for the period the official sets 1.
- A rental unit with no matching CO. A change in use or occupancy needs its own approval 2.
- Information on the application was wrong. The certificate can be suspended or revoked 1.
Do not live in unapproved space
An addition, basement bedroom or ADU that has not passed final inspection may lack working smoke alarms, safe exits or finished electrical work. Wait for the certificate or a temporary certificate before anyone sleeps there. For pre-1978 homes, renovation that disturbs paint must follow EPA lead-safe rules 5.
The rules behind certificates of occupancy
2021 IRC Section R110. R110.1 bars use or a change of occupancy until a certificate is issued, with exceptions for permit-exempt work and accessory structures. R110.2 sends changes in use to IEBC Sections 506 and 507. R110.3 lists the contents. R110.4 allows a temporary certificate. R110.5 allows suspension or revocation 1.
2021 IEBC Section 110. For existing buildings, 110.1 bars use, or a change of occupancy, until the code official issues a certificate, with an exception for permit-exempt work; 110.3 allows temporary occupancy; 110.4 allows revocation 2.
IEBC Chapter 6 classifies alterations as Level 1, 2 or 3, separate from change of occupancy and additions 3.
Local adoption. These are model codes. Your state or city adopts them with amendments and may add its own rules, such as other-agency sign-offs 4. This page is held for review by a building official or ICC-certified inspector before it is indexed.
Certificate of occupancy vs related approvals
| Approval | When | What it confirms |
|---|---|---|
| Building permit | Before work | That the planned work may proceed 1 |
| Rough-in inspection | Before walls close | That hidden systems may be covered 1 |
| Final inspection | Work complete | That the permitted work passed 1 |
| Certificate of occupancy | After final, where required | That the space may be used for its stated purpose 1 |
| Substantial completion | Near the end of the contract | A contract milestone between owner and contractor, not a code approval |
Common CO myths
- Myth Every remodel ends with a new certificate of occupancy.
- Reality Many interior remodels close with a final inspection. The model code ties the CO to use, occupancy and change of occupancy 1.
- Myth A CO means the house has no code problems.
- Reality It is not approval of any violation, and it covers only what was inspected 1.
- Myth A CO cannot be taken back.
- Reality The building official may suspend or revoke one issued in error or on wrong information 1.
- Myth Sheds and detached garages need one.
- Reality The IRC excepts accessory buildings and structures 1.
- Myth Certificates expire every few years.
- Reality That depends on the jurisdiction; New York City says its COs have no expiration date 4.
Why CO rules vary by city
Certificates are one of the most locally rewritten parts of the code. Some cities issue a certificate for nearly every permit; others only for new buildings, additions and changes of use.
Some require other agencies to sign off first, and some issue letters instead of certificates for minor work, as New York City does 4. Who may pull the permit that leads to a CO also depends on state contractor licensing. Ask your building department what document closes your type of project.
When a CO should change your plans
Ask about the certificate early if your project adds space, adds a unit, or changes how a space is used. Those are the jobs where a missing CO can block a sale, a rental or a refinance later. Build the wait into your schedule and your contract.
If you are weighing an addition against moving, the approval path is part of the decision. Our remodel vs move calculator helps compare the two, and our home additions page covers what that kind of project involves.
- If Finish work only (paint, tile, cabinets)
- Then No permit, so no CO in the model code
- If Interior remodel, same use
- Then Usually a final sign-off; confirm locally
- If Addition or new dwelling unit
- Then Expect a CO or amended CO before use
- If Change of use (garage to bedroom, basement to rental)
- Then Ask about a CO under IEBC change-of-occupancy rules
Questions about Certificate of Occupancy
What is a certificate of occupancy?
It is a document from the building official that says a building, or a described part of it, may be used for its stated purpose. In the 2021 IRC it is issued after inspection finds no violations. It lists the permit number, address, owner, the part covered and the code edition used.
Do I need a certificate of occupancy after a remodel?
Often not for an interior remodel of a home that already has a lawful use; those usually close with a final inspection. Additions, new dwelling units and changes of use are where a new or amended CO is most likely. Your building department decides, so ask when the permit is issued.
What is a temporary certificate of occupancy?
It lets parts of a building be used before all the permitted work is done, as long as those parts can be occupied safely. Under the 2021 IRC, the building official sets how long it is valid. It is common when a family must move into finished rooms while outside work continues.
How is a CO different from a final inspection?
The final inspection checks that the permitted work is complete and meets code. The certificate is the document that follows, saying the space may be occupied for its purpose. Some remodels end with only the final sign-off; new space and changes of use usually also get a certificate.
Can I move in before getting a certificate of occupancy?
Not legally under the model code where a certificate is required. The 2021 IRC says a building may not be used or occupied, in whole or in part, until the certificate is issued. A temporary certificate is the lawful route to early move-in for safe portions.
Does a shed or detached garage need a certificate of occupancy?
Not under the 2021 IRC, which excepts accessory buildings and structures from the certificate rule. A building permit may still be needed for larger accessory buildings. A detached ADU is a dwelling, not just an accessory structure, so expect it to need approval before anyone lives there.
Does a certificate of occupancy expire?
It depends on the jurisdiction. New York City says a CO has no expiration date. A temporary certificate does expire on a date the building official sets. A certificate can also be suspended or revoked if it was issued in error or the building is in violation.
How do I find the certificate of occupancy for my house?
Ask your local building department for the property’s permit and certificate records. Some cities put them online; New York City lets you search by address and print the CO. Older homes may predate certificates, which some cities handle with a letter confirming legal use.
Can a certificate of occupancy be revoked?
Yes. The 2021 IRC lets the building official suspend or revoke it in writing if it was issued in error, on incorrect information, or if the building is found in violation of the code or other ordinances.
Sources
- ICC, 2021 International Residential Code, Chapter 1 Scope and Administration (R104, R105, R109, R110), retrieved .
- ICC, 2021 International Existing Building Code, Chapter 1 Scope and Administration (Section 110), retrieved .
- ICC, 2021 International Existing Building Code, Chapter 6 Classification of Work, retrieved .
- NYC Department of Buildings, Certificate of Occupancy, retrieved .
- U.S. EPA, Lead Renovation, Repair and Painting Program, retrieved .
Expert review
Written by the HyreRemodel Research team. Not yet reviewed by an outside expert. We say so rather than imply a review that has not happened; see our editorial policy.
How the numbers were checked: Occupancy rules, exceptions, contents, temporary certificates and revocation were read from 2021 IRC Section R110 and the inspection sequence from R109 on ICC Digital Codes; existing-building rules from 2021 IEBC Section 110 and work classes from IEBC Chapter 6.
City practice (no expiry, Letter of Completion, Letter of No Objection, open-violation rule) is from the NYC Department of Buildings and is cited only as one city’s example.
The remodel table applies model text and is not a local ruling. No fees are given. Held noindex until a building official or ICC-certified inspector reviews it.
Suggest a correction. We fix errors and say what changed.