Accessory Structures in Carmel, IN (2026)
5 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 defines an Accessory Dwelling as a separate unit on a single-family lot but does not list ADUs as a permitted accessory use in standard residential districts. A detached guest house with cooking facilities is allowed only on lots of at least one acre, and a separately rented ADU generally requires a variance or PUD approval.
Carmel Accessory Dwelling Units (ADUs)
Heavy RestrictionsShed Rules
Sheds are 'accessory buildings' under Carmel UDO Section 5.02. A detached shed must sit at least 25 feet behind the front of the home and 5 feet from side/rear lines (or easement plus 3 feet) when more than 10 feet from the house. An Improvement Location Permit is required, and the fee starts at $105 plus $0.11 per square foot over 150 square feet.
Carmel Shed and Accessory Building Rules
Some RestrictionsGarage Conversions
Carmel has no dedicated 'garage conversion' ordinance. Converting a garage into living space is a structural modification requiring a permit (residential structural modification fee $175 plus inspections), and the new use must still satisfy the UDO's accessory-use and dwelling rules. Converting a garage into a separate rentable unit would meet the same ADU restrictions and likely require a variance.
Carmel Garage Conversion Rules
Some RestrictionsCarport Rules
Carports are accessory structures in Carmel and need an Improvement Location Permit; the detached garage or carport permit fee is $175 plus inspections. A carport attached only by a continuous roof on customary supports is still treated as an accessory building under UDO Section 5.02, subject to its setback, size, and lighting limits.
Carmel Carport Rules
Some RestrictionsTiny Homes
Carmel's UDO allows manufactured/factory-built homes in single-family and two-family districts only if they exceed 950 square feet of occupied space, meet the district's minimum size, and sit on a permanent foundation below the frost line. Movable tiny houses on wheels and RVs are not allowed as permanent dwellings outside an approved manufactured home park, making most 'tiny homes' infeasible without a variance.
Carmel Tiny Home and Manufactured Home Rules
Heavy RestrictionsLooking for Hamilton County county-wide rules?
County ordinances apply to unincorporated areas and may supplement Carmel city rules.
Accessory Structures in Hamilton County →