O'Fallon Building Permit Cost Calculator
Estimate O'Fallon, IL building permit fees for commercial and residential projects. Based on IL state averages - verify with the O'Fallon permit office.
About O'Fallon permits
O'Fallon falls under IL's general building permit structure - a base fee plus a percentage of project valuation, with separate plan-review and (on commercial work) zoning charges. The estimate on this page uses the IL state average until we have verified O'Fallon-specific fees.
Other permit types in O'Fallon
The building permit fee above is one slice. A typical commercial bid also carries electrical, plumbing, mechanical, and fire-review fees. Drill into each type: