Illinois Building Permit Costs by County
| County | Base Permit | Impact Fees | Total Estimate | Notes |
|---|---|---|---|---|
| Lake County | $3,500–$8,500 | $9,000–$18,000 | $12,500–$26,500 | North Shore — highest in IL |
| DuPage County | $3,200–$8,000 | $8,500–$17,000 | $11,700–$25,000 | Naperville / Wheaton / Downers Grove |
| Kane County | $2,800–$7,000 | $7,500–$15,000 | $10,300–$22,000 | Aurora / Elgin / St. Charles |
| Will County | $2,500–$6,500 | $7,000–$14,000 | $9,500–$20,500 | Joliet / Plainfield — south suburb |
| Cook County | $3,000–$7,500 | $8,000–$16,000 | $11,000–$23,500 | Chicago metro — union wage zone |
| McHenry County | $2,200–$5,500 | $6,000–$12,000 | $8,200–$17,500 | Crystal Lake / Woodstock — outer ring |
| Winnebago County | $1,500–$4,000 | $3,000–$7,000 | $4,500–$11,000 | Rockford — affordable NW IL |
| Sangamon County | $1,500–$3,800 | $2,500–$6,000 | $4,000–$9,800 | Springfield — state capital |
| Peoria County | $1,400–$3,500 | $2,200–$5,500 | $3,600–$9,000 | Peoria area — central IL value |
| Macon County | $1,200–$3,000 | $1,800–$4,500 | $3,000–$7,500 | Decatur — most affordable major county |
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Frequently Asked Questions
How much does a building permit cost in Illinois?
A building permit for new construction in Illinois costs $9,000–$34,500 total depending on county. Lake County (North Shore) and DuPage County (Naperville) are the most expensive at $11,700–$26,500 — driven by Chicago metro union labor zones and high-quality school districts. Macon County (Decatur) is the most affordable major market at $3,000–$7,500. The Chicago suburb vs downstate IL permit cost gap can exceed $19,000 for the same home.
What is the Chicago 40-mile rule and how does it affect permit costs?
The Chicago Building Trades "40-mile rule" requires contractors within approximately 40 miles of Chicago city center to pay full union wages even on non-union jobsites. This affects virtually all of Cook, DuPage, Kane, Lake, and Will Counties — most Chicago suburbs where new homes are built. The practical effect on permits is indirect: the union wage floor makes construction 25–40% more expensive in this zone, and municipalities have set permit fee structures that reflect this higher construction cost base. Higher project valuations mean higher valuation-based permit fees.
How long does it take to get a building permit in Illinois?
DuPage County (Naperville, Wheaton) takes 5–9 weeks. Kane County (Aurora, Elgin) takes 5–8 weeks. Cook County suburbs take 6–12 weeks. Will County (Joliet, Plainfield) takes 5–9 weeks. Lake County takes 5–10 weeks. Downstate Illinois counties permit much faster — Peoria and Springfield take 3–5 weeks, rural counties 1–3 weeks. Chicago city proper is the slowest at 8–16 weeks.
Does Illinois have high property taxes in addition to permit fees?
Yes — Illinois has the second-highest property tax rates in the nation after New Jersey. DuPage County homes pay effective rates of 1.8–2.5% annually. A new $400,000 home in Naperville pays $7,200–$10,000/year in property taxes. This doesn't affect permit costs directly but significantly affects total cost of ownership. Always research annual property taxes for your specific parcel before committing to a build site in Illinois.
Is it cheaper to build in Rockford or Peoria than in Chicago suburbs?
Significantly cheaper. A permit that costs $11,700–$25,000 in DuPage County costs $3,600–$11,000 in Peoria County — a difference of up to $14,000 just in permit fees. Construction costs themselves are also 25–35% lower in downstate Illinois due to the absence of the Chicago union wage floor. For buyers without a Chicago commute requirement, Rockford, Peoria, Springfield, and Champaign offer dramatically lower total build costs.
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