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Carmel, IN Accessory Structures: Garage Conversions (2026)

Some Restrictions
Compiled from the official code textEditor Martyn O'NeillLast verified July 2026

Garage conversion rules in Carmel, IN, sometimes called garage-to-ADU or accessory living unit conversions, govern permits, ceiling height, egress, and parking replacement.

Key Facts

Garage + accessory cap
75% of house floor area
Sole detached garage
Up to 24 x 30 feet
Exempt lots
Over 3 acres; multi-family
Setback behind front line
25 feet
Code section
UDO 5.02(B)(3)

Summary

Carmel caps a private garage plus accessory buildings at 75% of the principal building's ground-floor area. A detached garage that is the only accessory building may be up to 24 by 30 feet, subject to Section 5.02 setbacks.

The combined square footage of the Ground Floor Area of a Private Garage and/or Accessory Building shall not exceed seventy-five percent (75%) of the Ground Floor Area of the Principal Building.

View official code

Full Breakdown

Under Carmel UDO Section 5.02(B)(3), the combined ground-floor area of a private garage and/or accessory buildings cannot exceed 75% of the ground-floor area of the principal building. A detached garage that is the only accessory building on the lot may equal 24 by 30 feet, provided its ground-floor area is no greater than that of the house. Lots over 3 acres and multiple-family residential are exempt. Converting a garage to living space is a change of use that requires building permits and must still meet zoning district standards; any new detached garage follows the 25-foot-behind-front-line and 5-foot setback rules.

Violations & Fines

Converting or building a garage without permits, or exceeding the 75% ground-floor-area cap, violates the UDO and building code and can trigger stop-work orders and fines.

Frequently Asked Questions

How big can my detached garage be?
If it is the only accessory building, up to 24 by 30 feet, and its floor area cannot exceed your house's ground-floor area.
Can I convert my garage into a room?
Garage conversions are a change of use requiring building permits; the result must still meet Carmel's zoning district and parking standards.

Sources & Official References

Other rules in Carmel

Parking Rules: Street Parking LimitsSome RestrictionsADU RulesSome RestrictionsShed & Carport RulesSome RestrictionsParking Rules: RV & Boat ParkingSome RestrictionsParking Rules: Driveway RulesSome RestrictionsParking Rules: Abandoned VehiclesSome RestrictionsParking Rules: Commercial & Oversized VehiclesSome RestrictionsFence Regulations: Material RestrictionsFew Restrictions

All Carmel rules

Compare Carmel to another location·View the Indiana accessory structures overview

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