Permit Required? Required
Typical Fee Range $1,800–$3,650 (Base Permit) Base fee of $1,800 applies for adding a dwelling unit per the 2026 fee table amendment.
Fee Method Project-based
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What's Required in Chicago

  • ADUs are permitted by-right in all multi-unit and some business districts (April 2026 ordinance).
  • Must be located on a lot with an existing residential structure (Conversion or Coach House).
  • Maximum of two units allowed per ADU project depending on ward and lot density.
  • Projects with two or more ADUs must reserve 50% as legally affordable (60% AMI or less).
  • Coach houses cannot exceed 700 sq ft of total floor area.
  • Parking requirements for ADU units are waived citywide under the new ordinance.

How to Get a ADU Permit in Chicago

1

Step 1: Check Eligibility Map

Verify your ward is included in the expanded 34-ward zone (as of April 2026).

2

Step 2: Hire Architect

Full architectural and MEP plans are required for all newly established dwelling units.

3

Step 3: Plan Review Submission

Submit through the Standard Plan Review process via ProjectDox.

4

Step 4: Fee Payment

Pay the $600 deposit followed by the $1,800 minimum unit-creation fee.

5

Step 5: Final Certificate

Obtain final inspections and a new Certificate of Occupancy for the ADU.

Frequently Asked Questions

Yes, under the April 2026 expansion, coach houses are allowed by-right in eligible residential zones.
The base permit fee starts at $1,800, but total costs including plans and trades often exceed $5,000.
No, the 2026 ordinance specifically waives parking requirements for ADUs.