Chicago ADU Permit Fees & Cost Calculator
Chicago’s official ADU program page confirms ADUs are allowed under city ordinance, but the city page does not publish a clear ADU-specific fee schedule; the best official lead is that projects go through the standard Department of Buildings permit process, and exact permit, review, and utility-related charges must be verified with the relevant city departments.
Free ADU fee calculator
Estimate local ADU fees
Step 1 of 5: Location
The calculator uses staged city data from the ADUFee database with visible confidence levels and dated source tracking.
Fee overview
The non-official search results contain fee estimates and claims about recent ADU ordinance changes, but they are not suitable for exact fee extraction.
Do not use the unofficial fee ranges from third-party sites as exact Chicago ADU fees without verification from city or utility sources.
If the property needs water, sewer, or electrical upgrades, those charges can materially change total pre-development cost and are not captured here.
Chicago does not appear to publish a separate ADU-only fee schedule on the official ADU program page provided in the search results.
Any exact permit, inspection, utility, or processing fees must be verified against current City of Chicago Department of Buildings and utility schedules.
The search results did not provide a reliable official source for a numeric ADU fee amount, so numeric fields are left null.
FAQs
Are Chicago ADU fee estimates official?
No. ADUFee.com provides planning estimates only. Final fees are set by the city, utility providers, school district, and other agencies.
What sources are used for Chicago?
The database stores city, state, utility, school, county, and other source links where available. Each estimate should still be verified locally.
Can ADU fees vary within Illinois?
Yes. Permit, utility, school, inspection, and impact fees can vary by jurisdiction, parcel, project size, utility provider, and local interpretation.