DuPage County, IL Building Safety: Building Inspections (2026)

Sec. 8-115.2, REQUIRED INSPECTIONS, requires the owner or contractor to "contact the Building Official at least one day in advance for all required inspections," then lists them by construction stage: erosion control before excavation, footing before concrete is poured, foundation walls where reinforcement is used, backfill only after a spotted plat of survey showing foundation location and elevation is submitted, pre-pour concrete for flatwork, under-slab plumbing/radon/electrical/insulation before slabs are poured, framing before insulation or wall finish goes up, house wrap before exterior cladding, rough plumbing/electrical/HVAC before insulation, an insulation inspection tied to State of Illinois Energy Efficient Building Code compliance, masonry and prefab fireplace stages, a grading inspection requiring an as-built drawing sealed by a registered land surveyor or Illinois professional engineer, plumbing final, and a final inspection after all work and permit conditions are complete.

Inspections are limited to "regular workdays between 8:00 A.M. and 4:00 P.M.," still with one day's advance call required. If the Building Official arrives and the job isn't ready, Sec. 8-115.2(1) allows a re-inspection fee under the fee schedule, and no further inspections proceed until it's paid. Sec. 8-115.1 also lets the Building Official run a preliminary inspection of the site before ever issuing the permit. A final inspection under Sec. 8-115.3 must happen, and any discrepancies from the approved plans noted, before the county will issue the Certificate of Use and Occupancy required by Sec. 8-119.1 to actually occupy the building.