Midwest
Home permits and project costs in Will County, IL
Will County has about 700,000 residents and its seat is Joliet. If your address is outside city limits, Will County is your permit authority.
Verified August 2026
Local cost index
+9%
vs national average
Permit fee index
+10%
vs national baseline
Regulatory complexity
55/100
wind, flood and review load
Coverage priority
66/100
research order score
Who issues permits in Will County?
Depends on your address
Inside city limits, the city building department issues the permit. Outside city limits — unincorporated Will County — the county building department reviews, permits and inspects the work. Both enforce the same code basis (Local adoption of the IRC; statewide plumbing and energy codes apply), but fee schedules, zoning setbacks and review times differ.
Project costs in Will County
National baselines adjusted by the regional labor and material index. Modeled estimates, not quotes.
| Project | Typical cost | Permit |
|---|---|---|
| Roof Replacement | $11,100 – $37,400 | Yes |
| AC Replacement | $5,900 – $17,500 | Yes |
| Fence Installation | $2,700 – $12,400 | Usually yes |
| Water Heater Replacement | $1,400 – $6,200 | Yes |
| Pool Installation | $43,700 – $132,300 | Yes |
| Window Replacement | $8,600 – $39,200 | Yes |
| Electrical Panel Replacement | $2,200 – $7,800 | Yes |
| Generator Installation | $7,400 – $25,100 | Yes |
| Solar Panel Installation | $16,900 – $54,100 | Yes |
| Kitchen Remodel | $19,900 – $101,600 | It depends |
| Bathroom Remodel | $10,000 – $46,500 | It depends |
| Driveway Replacement | $4,700 – $21,400 | Usually yes |
| Paver Patio & Walkway | $3,900 – $17,800 | It depends |
| Deck Construction | $6,300 – $31,900 | Yes |
| Shed Installation | $2,000 – $13,300 | It depends |
| Whole-House Repipe | $5,200 – $18,300 | Yes |
| EV Charger Installation | $900 – $4,800 | Yes |
| Hurricane Shutter Installation | $3,700 – $21,000 | Yes |
| Pool Enclosure / Screen Cage | $10,400 – $48,600 | Yes |
| Septic System Replacement | $8,700 – $32,400 | Yes |
| Impact Window Installation | $10,500 – $48,800 | Yes |
| Exterior Door Replacement | $1,000 – $7,500 | Usually yes |
| Garage Door Replacement | $1,600 – $8,700 | Yes |
| Siding Installation | $9,100 – $43,400 | Usually yes |
| Stucco Repair | $1,000 – $17,800 | It depends |
| Soffit & Fascia Replacement | $2,100 – $12,600 | It depends |
| Gutter Installation | $1,000 – $7,100 | Usually no |
| Roof Repair | $500 – $5,500 | It depends |
| Flat Roof Replacement | $7,000 – $32,600 | Yes |
| Attic Insulation | $1,300 – $8,200 | Usually no |
| Ductwork Replacement | $2,800 – $13,600 | Yes |
| Mini Split Installation | $2,700 – $14,100 | Yes |
| Flooring Installation | $2,700 – $21,900 | Usually no |
| Tile Installation | $2,000 – $17,600 | Usually no |
| Interior Painting | $1,700 – $10,500 | Usually no |
| Exterior Painting | $3,100 – $16,600 | Usually no |
| Drywall Repair | $400 – $5,000 | Usually no |
| Kitchen Cabinet Refacing | $5,000 – $22,000 | Usually no |
| Countertop Replacement | $2,400 – $13,100 | Usually no |
| Tub to Shower Conversion | $4,000 – $18,100 | Usually yes |
| Sod Installation | $1,000 – $7,700 | Usually no |
| Irrigation System Installation | $2,400 – $11,100 | It depends |
| Tree Removal | $500 – $6,200 | It depends |
| Outdoor Kitchen | $6,800 – $50,700 | Usually yes |
| Seawall Repair | $9,300 – $110,900 | Yes |
| Dock Construction | $10,500 – $99,200 | Yes |
| Well Installation | $6,300 – $28,800 | Yes |
| Mold Remediation | $1,700 – $16,900 | It depends |
| Water Softener Installation | $1,400 – $7,300 | Usually yes |
| Home Addition | $52,400 – $325,900 | Yes |
County facts
| County seat | Joliet |
|---|---|
| Population | 700,000 |
| Government type | Confirm home-rule status locally |
| Region | Midwest |
| Municipalities tracked | 1 |
| Building codeConfirm the adopted edition locally | Local adoption of the IRC; statewide plumbing and energy codes apply |
Cities and towns in Will County
Municipalities may run their own building department with different fees and rules.
Common questions
Who issues my permit — the city or the county?
If your address is inside city limits, the city building department issues the permit. Outside city limits, the county building department does. A quick call to either office with your parcel number settles it in a minute.
Can I pull my own permit as a homeowner?
Most states allow an owner-builder permit on a home you occupy, with conditions: you may have to appear in person, sign an affidavit, and you cannot hire unlicensed help. Trades like electrical and gas often still require a licensed contractor.
What happens if work was done without a permit?
Unpermitted work usually surfaces at resale or during an insurance claim. Most jurisdictions offer a retroactive or after-the-fact permit, typically at a higher fee, and may require opening finished areas so an inspector can see the structure.
How long does permit review take?
Simple over-the-counter trade permits are often same-day to a week. Structural or additions work commonly runs two to eight weeks depending on backlog, and coastal, historic or floodplain review adds time.