Accessory Structures in Noblesville, IN (2026)
5 verified accessory structures rules for Noblesville, Indiana, sourced directly from the municipal code and official government pages.
Verified from official government sources
ADU Rules
Noblesville UDO Sec. 159.121 permits exactly one Accessory Dwelling Unit (ADU) per lot or parcel, but with strict limitations: the ADU is initially intended for relatives or resident domestic employees, must share utilities with the principal building (separate metering is prohibited), must blend architecturally with the principal building, may not have a front-facade entrance or exterior stairway, and must keep the principal building's appearance as a single-family residence. Indiana has no statewide ADU mandate, and Noblesville's posture is markedly more restrictive than Carmel's relatively permissive ADU framework.
Noblesville Accessory Dwelling Unit (ADU) Rules
Heavy RestrictionsShed Rules
Noblesville UDO Sec. 159.121 caps combined accessory structures (sheds, detached garages, gazebos, pool houses) at 50 percent of the principal building's footprint or 1,000 sq ft (whichever is less) on lots 1 acre or smaller, at a maximum 17-foot height. Side and rear setbacks default to the underlying zoning district; structures over 200 sq ft require a building permit through the Citizen Permit Portal ($75 base fee). Larger lots get larger allowances (2,000 sq ft on 1-5 acres; 4,000 sq ft on 5+ acres).
Noblesville Shed Rules
Some RestrictionsGarage Conversions
Converting an existing attached or detached garage into habitable living space in Noblesville requires a building permit under Chapter 154 (Building Code) and compliance with the Indiana Residential Code (adopted under IC 22-12). The new space must meet residential code minimums for ceiling height, egress windows, smoke and CO alarms, insulation, and energy code. Because conversion removes a parking space, alternative off-street parking must be provided, and if used as a second dwelling unit it triggers the ADU rules in UDO Sec. 159.121.
Noblesville Garage Conversions
Some RestrictionsCarport Rules
Noblesville UDO Sec. 159.121 treats carports as accessory structures and lists them alongside garages, canopies, and porte-cocheres. Carports for private residential use are permitted in all residential districts, subject to the same combined accessory size cap (1,000 sq ft on lots ≤ 1 acre) and setback rules as sheds. A building permit is required for any carport over 200 sq ft, and the carport must meet the underlying district's front and side setbacks — front-yard placement is generally prohibited unless integrated with the principal driveway.
Noblesville Carport Rules
Some RestrictionsTiny Homes
Noblesville UDO Sec. 159.106 permits manufactured homes (which include some tiny home designs) as scattered-site residences in all residential districts, but only if they meet single-family dwelling standards: double-section construction, minimum square footage for the zoning district, longest side facing the street, and attachment to a permanent foundation per the Indiana One- and Two-Family Dwelling code. Tiny homes on wheels (THOWs) and stick-built tiny homes under the minimum dwelling square footage for the district are not permitted as primary residences. ADU-style tiny homes still must comply with Sec. 159.121.
Noblesville Tiny Home Rules
Heavy RestrictionsLooking for Hamilton County county-wide rules?
County ordinances apply to unincorporated areas and may supplement Noblesville city rules.
Accessory Structures in Hamilton County →