Will County, IL permit planning guide

Illinois has no single statewide residential building code — municipalities (many home-rule) adopt and enforce their own codes. Statewide minimums include the Illinois Plumbing Code (IDPH, licensed plumbers required), the Illinois Energy Conservation Code, and the Illinois Accessibility Code. Zoning, signs, fences, and right-of-way permits are entirely local.

• Start with the parcel location. County authority can differ inside the same county depending on whether the site is in an incorporated city, village, town, or unincorporated area.
• Use this page as a readiness checklist before any phone calls so you can submit complete, accurate information to the right office.
• Flag overlays early—shoreland, floodplain, roads, drainage, septic, and access approvals can add extra approvals that are easy to miss.
• Gather owner information, a rough site plan, and project scope details before contacting agencies.
• Validate the final office list with Permit Check once your parcel and project context are captured.

This is a preparation sequence, not a claim that Will County, IL issues every listed approval. Permit Check confirms the issuing authority for the parcel before filing.

1. Confirm the parcel, municipality, project scope, and any county or state overlay before choosing an application.
2. Gather the site plan, project dimensions, ownership information, and any trade or contractor details the office requests.
3. Resolve prerequisite zoning, shoreland, floodplain, sanitary, access, or land-use reviews before the building application when applicable.
4. Submit each approval to the office that issues it and keep the records together through inspections and closeout.

These references and project checks help you identify county-level steps before you contact the issuing office. A city, village, town, or state agency may handle other approvals for the same project.

Offices that may be involved

• Will County Land Use Department: Accessory Dwelling Unit Permit

Packet requirements

• Online permit application (SmartGov Public Portal): Apply on the SmartGov Public Portal (co-will-il.smartgovcommunity.com); upload documents, schedule inspections, pay fees, print the permit.
• Plat of survey (3 copies): Plat of survey (3 copies) depicting the lot lines, setbacks, existing structures and the proposed construction, drawn to scale. May be combined with the site plan.
• Site plan (3 copies, PE-sealed): Applies to: conditional. Site plan (3 copies) signed and sealed by a Professional Engineer, unless exempt under Water Resource Ordinance §500.1; a site-development fee applies in addition to the building permit fee.
• Building / structural plans (3 sealed sets): Building/structural plans (3 sealed sets) sealed by an appropriate design professional; otherwise submit manufacturer design & specifications.
• Contractor / subcontractor list (county-registered, GL/WC/BD): All contractors and subcontractors must be registered with the County (GL/WC/BD); unregistered => the permit may be revoked.
• Water supply / sanitary system disclosure: Public/Well water and Sewer/Septic disclosure; Health Department well & septic requirements apply.

Fee schedules

• Building Permit (residential): Will publishes DIFFERENT flat fees by structure type that cannot share one building-permit row: deck $125 ((2)(a)); shed <200 sf w/o concrete $75 ((1)(a)); new accessory <400 sf $125 / >400 sf $200+$5/100 sf ((8)); addition <500 sf $450 ((6)); new SF home <3,000 sf $2,700 ((7)); solar 0-100 kW $125 ((14)) — recorded on the family trigger notes. Do not present $0; confirm the applicable § 158.02 line. Fences require NO permit (§ 155-14.90(E)) => no fence fee.
• Swimming Pool Permit (in-ground): Base fee $300 · minimum $300 · Seeded as in-ground $300 (§ 158.02(3)(b)). Above-ground pool/hot tub/spa $175 ((3)(a)) and public pool $500 ((3)(c)) noted here (one flat per permit_id). A protective barrier >=5 ft is required; an electrical permit is separate.

• Illinois statewide code source

Confirm the current office instructions, application version, and adopted fee schedule before filing.