Accessory Structures in Carmel, IN (2026)
3 verified accessory structures rules for Carmel, Indiana, sourced directly from the municipal code and official government pages.
Verified from official government sources
ADU Rules
Carmel's UDO permits a guest house with cooking facilities as an accessory building only on lots of at least one acre. Detached accessory dwelling standards follow Section 5.02 accessory-building setbacks; separate accessory dwelling units are not broadly allowed in standard residential districts.
ADUs and guest houses in Carmel, Indiana
Some RestrictionsCarmel UDO Section 5.02(C)(4)
Guest House: One (1) Guest House with cooking facilities may be permitted as an Accessory Building on Lots containing not less than one (1) acre.
Shed & Carport Rules
A carport in Carmel is an accessory structure under UDO Section 5.02: it must be detached from the house (except an allowable continuous roof on customary supports), sit at least 25 feet behind the front line, and meet the 5-foot side/rear setback.
Carports and accessory structures in Carmel, Indiana
Some RestrictionsCarmel UDO Section 5.02(A)(4)
Accessory Buildings shall not be attached to the Principal Building, with the exception of an allowable uniform and continuous roof supported by customary supports or joists, and no other connection or attachment between the structures exists.
Garage Conversions
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.
Detached garages and ground-floor area in Carmel, Indiana
Some RestrictionsCarmel UDO Section 5.02(B)(3)(a)
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.
Looking for Hamilton County county-wide rules?
County ordinances apply to unincorporated areas and may supplement Carmel city rules.
Accessory Structures in Hamilton County →