Whether you need an occupancy permit to move in depends on what kind of move it is and where the property sits. New construction almost always requires a Certificate of Occupancy before anyone can legally live in the building. Major renovations and any change in how the building is used trigger the same requirement. An ordinary resale of an existing home usually does not, though some municipalities require a fresh certificate every time a property changes hands or a rental gets a new tenant. There is no federal rule here; the answer comes from your local building department.
What a Certificate of Occupancy Is
A Certificate of Occupancy, often shortened to CO, is a document from the local building department confirming that a property has been inspected and meets the applicable building, fire, and safety codes. It establishes the legal use of the building and specifies details like the type of occupancy, the maximum number of occupants, and whether sprinkler systems are required. It is the government’s sign-off that the structure is safe to inhabit for the purpose listed on the certificate.
Under the International Building Code, which most local governments adopt as the basis for their own rules, the building official issues a CO only after inspecting the property and finding no code violations. The certificate lists the permit number, the approved use and occupancy type, the type of construction, and any special conditions from the building permit.1International Code Council (ICC) Digital Codes. 2024 International Building Code – Section 111.2 Certificate Issued
When You Need One Before Moving In
New Construction
Every newly built home or commercial building needs a CO before anyone can legally occupy it. The building department will not issue one until all inspections pass and the structure meets code. If you are buying new construction from a builder, this step happens before closing in virtually every jurisdiction.
Major Renovations and Additions
Projects that alter a building’s structure, electrical, plumbing, or mechanical systems generally require a new CO before you reoccupy the space. Cosmetic updates like painting or replacing flooring typically do not. The dividing line is whether the work needed a building permit. If it did, expect to need a fresh CO.
Change of Use
Converting a building from one type of use to another always requires a new CO. The International Existing Building Code prohibits a change of occupancy classification without approval from the building official and issuance of a new certificate confirming the building meets code for its new purpose.2International Code Council (ICC) Digital Codes. International Existing Building Code 2018 – Chapter 10 Change of Occupancy Turning a warehouse into apartments or converting a single-family home into a duplex are classic examples. Even shifting from one commercial use to another can trigger the requirement when fire protection thresholds differ.
Sale or New Tenant, Depending on Locality
This is where local rules diverge the most. Some municipalities require a new CO or occupancy inspection every time a property is sold, even if nothing about the building has changed. Others require landlords to obtain a fresh permit for each new tenant in a rental property, particularly in multi-unit buildings. Many jurisdictions require nothing at all for a straightforward resale. The only reliable way to know is to check with the building department where the property sits.
When You Do Not Need a New One
For a resale of an existing home where no recent construction has taken place, most jurisdictions do not require a new CO, and lenders generally do not either. Older buildings constructed before a municipality adopted CO requirements may never have had one issued, and that is perfectly legal. Many cities exempt buildings built before a certain date unless later renovations changed the structure or use. If you are looking at a pre-war home and the building department has no CO on file, that alone is not a red flag. Ask the department specifically whether the property is exempt or whether a CO should exist but does not.
What Happens if You Move In Without One
Local governments treat occupying a building without a required CO as a code violation, and the penalties push hard toward quick compliance.
Fines are the most common consequence, and many jurisdictions assess them per day for each day you remain in the property without a valid certificate. A building department can also issue an order to vacate, requiring you to leave until the CO is obtained. Some jurisdictions can order utilities disconnected to an illegally occupied building.
Insurance is another pressure point. If your home suffers damage and the insurer discovers the property lacks a CO or that the damage relates to unpermitted work, the claim may be denied. In some cases the insurer may cancel the policy once they learn the property is not legally certified for occupancy. The reasoning is that they underwrote a policy for a code-compliant home.
There is also a personal liability angle. If someone is injured in a building that lacks a required CO, the owner faces significantly greater legal exposure. The absence of the certificate can be used as evidence that the owner knew or should have known the building did not meet safety standards.
How a Missing CO Can Hold Up Your Closing
Lenders care about certificates of occupancy because a CO confirms the collateral they are lending against is legal and code-compliant. For FHA-insured loans, HUD requires the mortgagee to obtain a copy of the CO for any property that is proposed construction, currently under construction, or was completed less than one year before the loan application.3U.S. Department of Housing and Urban Development. Mortgagee Letter 2020-36 Fannie Mae similarly requires certificates of occupancy for all units on any property where construction or rehabilitation was completed within the prior 12 months.4Fannie Mae. Certificates of Occupancy
Freddie Mac follows the same approach: for recently constructed or rehabilitated properties, proof of a CO is required, and if certificates are not available, the lender must demonstrate that the absence does not violate local laws and will not trigger enforcement action against the property.5Freddie Mac. Certificate of Occupancy Additional Guidance A missing CO on new construction or a major renovation can stall closing indefinitely. The lender will not fund the loan until it is resolved.
The same wall shows up on the local side. If your municipality requires a CO for the ownership transfer and one cannot be issued because of code violations, the sale cannot close until the property is brought into compliance.
If the Building Is Almost Ready: Temporary Certificates
A Temporary Certificate of Occupancy, or TCO, lets you move in before every last item on the project is finished, as long as the occupied portions are safe. The building official decides whether to grant one and sets the time period it remains valid. This comes up often with new construction where landscaping, exterior finishes, or non-critical punch-list items remain incomplete but the interior passes inspection.
A TCO is not a shortcut around safety. The portions you occupy must fully meet code. When the TCO expires, the remaining work must be completed and inspected to receive a permanent CO. If the work is not done in time, you may need an extension or risk being in violation.
How to Check Whether a Property Already Has One
Contact the local building department where the property is located and ask. Many municipalities now offer online permit and CO lookup tools where you can search by address. The department can tell you whether a CO was issued, what use the building is approved for, and whether any open violations exist. If you are buying, do this before you are committed to a closing date, not after. The certificate, or the lack of one, drives the timeline.