What Is a UDC Inspection in Wisconsin?

UDC inspections are the enforcement mechanism for Wisconsin's Uniform Dwelling Code (SPS 320–325), the statewide residential building code. Every municipality is required to enforce the UDC, either through its own inspection department or by contracting with a certified private inspection agency. UDC inspections are required at specific stages of new construction, remodeling, and renovation of one- and two-family dwellings throughout the state. For new residential construction, the standard UDC inspection sequence includes: footing inspection (before concrete is poured, verifying depth and dimensions), foundation inspection (after foundation walls are in place), rough framing inspection (structural framing, sheathing, and rough-in for electrical, plumbing, and HVAC before insulation and drywall), insulation inspection (verifying insulation type, R-values, and installation quality), and final inspection (after all work is complete, covering everything from electrical panel labeling to smoke detector placement). Some municipalities combine certain inspections or add additional ones for complex projects. To prepare for a UDC inspection, ensure that the work being inspected is complete and accessible. For a rough framing inspection, all framing should be complete with no drywall installed, and electrical, plumbing, and HVAC rough-ins should be visible. Common reasons for failed inspections include improper nail patterns on sheathing, missing fire blocking, incorrect joist hangers, inadequate bathroom ventilation ducting, and GFCI/AFCI circuit protection not installed where required. If an inspection fails, the inspector will provide a correction notice listing the deficiencies, and you must schedule a re-inspection after making corrections. UDC inspectors in Wisconsin must be certified by DSPS. They can be municipal employees or private certified inspectors. Inspection fees are included in the building permit fee in most municipalities, though some charge separately for additional inspections or re-inspections ($50–$100 per re-inspection). You are required to schedule inspections at least 24 to 48 hours in advance in most municipalities. Do not proceed to the next construction stage until the current inspection is passed — covering up uninspected work can result in a requirement to open walls at your expense.

Check Your Municipality

Permit requirements, fees, and exemptions vary by municipality. Verify the specifics for your location.