Uniform Construction Code: PA vs NJ Rules Explained

A UCC does two jobs. It adopts a set of model codes, mostly the International Codes from the ICC, as the state's technical requirements. It also sets up who administers and enforces them: who takes permit applications, who reviews plans and who inspects the work.

The model codes are not the whole story. Each state adds amendments, so the code you design to is "the model code as amended by the state," not the ICC book on its own. Read the state's amendments before you finalize a code analysis. For how the underlying model code classifies buildings, see our guide to IBC construction types.

Where it comes from

The Pennsylvania Construction Code Act is Act 45 of 1999. The Act directed the state to adopt a uniform code by regulation. The Department of Labor and Industry (L&I) did that. The UCC first took effect on April 9, 2004, with the 2003 International Codes. L&I publishes the UCC regulations and statutes and the current adopted editions.

Who enforces it

Pennsylvania makes enforcement a local choice. Each municipality decides whether to administer and enforce the UCC itself or leave enforcement to others. A municipality that opts in does so by ordinance. The Act defines a "code administrator" broadly: a municipal code official, a construction code official, a third-party agency or L&I.

L&I's municipal election page explains the process. A municipality can change its decision, and it must give the Department 180 days' notice to do so.

Local ordinances commonly list four enforcement routes:

1. A municipal employee serves as the code official.
2. The municipality hires a third-party inspection agency.
3. Several municipalities share an agency under an intermunicipal agreement.
4. The municipality agrees to have L&I handle plan review and inspections.

The L&I route in many ordinances covers structures other than one- and two-family dwellings and utility and miscellaneous-use structures. Read the local ordinance for the exact scope.

What this means when you file

The practical question is: who is the code administrator for this parcel? Do not assume it is the borough or township office.

Opted-out municipalities, with the owner of a one- or two-family building choosing the inspector, are the case people miss. If you design in a township that opted out, you may be selecting your own third-party agency before you can get a permit.

Where it comes from

New Jersey's State Uniform Construction Code Act was signed in 1975. The regulations are N.J.A.C. Title 5, Chapter 23, administered by the Department of Community Affairs (DCA), Division of Codes and Standards. DCA's UCC overview is the starting page.

Subcodes

New Jersey splits its technical rules into subcodes, listed in N.J.A.C. 5:23-3:

The fire protection subcode is a composite. It pulls selected parts of the building, electrical, mechanical, fuel gas and one- and two-family dwelling model codes into one set of requirements. Chapter 23 also has separate subcodes for barrier-free access, asbestos hazard abatement, radon hazards, playground safety and elevator safety.

Code editions

DCA's rule adoption notice for the 2024 model codes lists an effective date of August 17, 2026. Other sources describe a grace period, so confirm the date that applies to your project with DCA before relying on either. Permits issued before a new code takes effect are generally handled under the edition in effect when they were issued, but check the rule text for your situation.

Who enforces it

Unlike Pennsylvania, New Jersey applications go to a local enforcing agency in nearly every case. Each agency is run by a state-licensed construction official. Smaller municipalities without their own office are served by DCA's local code enforcement office. For some building categories, the state does plan review while the local agency does the field inspections.

A single New Jersey construction permit can bundle several subcode applications: building, electrical, fire protection, mechanical and plumbing. Municipalities set their own fee schedules by ordinance, so get the number from the local agency. For how fees are calculated in general, see how much a building permit costs.

1. Confirm the state. Parcel address first, then state code.
2. Find the enforcing agency for that municipality. In Pennsylvania, check whether it elected to enforce. In New Jersey, find the local construction office.
3. Get the adopted code editions and state amendments from L&I or DCA, not from the model-code publisher alone.
4. Read local amendments and ordinances. Zoning, floodplain and historic rules sit outside the UCC and are enforced separately.
5. File the permit with the agency's required forms and drawings. Our guide to how to get a building permit walks through the steps.
6. Track review comments and inspection dates. If you manage many permits across municipalities, a shared tracker such as Olumba's permit tracking keeps the due dates in one place.

Work that is exempt from permits under the model code can still be regulated locally. Our guides on shed permits and deck permits show typical exemption thresholds and why you should still call the local office.