Permit Required? Required
Typical Fee Range $1,100–$2,500 Uses 'New Construction' residential base fee ($1,100) plus zoning and trade permits.
Fee Method Project-based
Apply Online Apply at City of Columbus Department of Building and Zoning Services →

What's Required in Columbus

  • Permitted 'by-right' on residential lots as of late 2025
  • Maximum size 1,000 sq ft or 65% of the principal unit (whichever is greater)
  • Maximum height is 25 feet or the height of the primary building
  • Independent cooking, sleeping, and sanitation facilities must be included
  • Historic districts (German Village, etc.) still require Commission approval
  • Lot coverage limit of 65% total including ADU and primary unit

How to Get a ADU Permit in Columbus

1

Step 1: Zoning Verification

Confirm lot coverage and setbacks for ADU eligibility.

2

Step 2: Professional Plans

Develop IRC-compliant construction drawings.

3

Step 3: Portal Submission

Submit 'Residential New Construction' for the ADU unit.

4

Step 4: Fee Payment

Pay building ($1,100) and zoning ($150–$300) fees online.

5

Step 5: Full Inspections

Schedule full sequence: Foundation, Framing, Trades, and Final.

Frequently Asked Questions

Yes, 'by-right' legislation allows ADUs on most residential lots as of late 2025.
City fees start around $1,500+ including building and zoning review.
Typically 1,000 square feet or 65% of the principal dwelling.