Accessory Structures in Boone County, IN (2026)
3 rules for unincorporated Boone County, Indiana.
Verified from official government sources
ADU Rules
Boone County Code Section 157.063 lets one accessory dwelling unit go on a parcel that already has a primary home, capped between 400 square feet and the lesser of 1,500 square feet or half the primary home's footprint. Any qualifying structure needs a special exception and building permit, or a recorded affidavit stating it will not be used as an ADU.
Boone County Accessory Dwelling Unit Standards
Some RestrictionsBoone County Code § 157.063(B)-(D)
(B) Applicability. In order to ensure that structures abide by the standards of this section, the following situations shall be classified as an accessory dwelling unit unless a “use affidavit” stating the structure will not be used as an accessory dwelling is filed with the Administrator and recorded with the County Recorder: (1) Any accessory structure that includes a bathroom, kitchen facili...
ADU Owner Occupancy
Boone County Code Section 157.063(C) requires an accessory dwelling unit to stay under the same ownership as the primary home. It can never be sold off as a separate parcel, and either the main house or the accessory unit, but not both left vacant of the owner, must actually be occupied by the parcel's owner.
Boone County ADU Owner-Occupancy Rule
Some RestrictionsBoone County Code § 157.063(C)
(A) Purpose. It is the purpose of this section to regulate an accessory residential structure on a parcel where a primary residential structure exists in order to provide housing options for family members, students, aging residents, in-home health care providers, the disabled, and others; promote a variety of housing opportunities in the community; and allow homeowners to benefit from added in...
Shed & Carport Rules
In unincorporated Boone County, Indiana, a storage shed over 50 square feet needs an improvement location permit (ILP). Code § 157.021(F)(1) lists sheds alongside garages, gazebos and greenhouses as accessory structures needing an ILP, and the fee runs $0.10 per square foot with a $100 minimum.
Shed Rules: Unincorporated Boone County, IN
Some RestrictionsBoone County Code § 10.99; § 157.021(F)(1)
Any person, firm or corporation who violates any provision of this code for which another penalty is not specifically provided shall, upon conviction, be subject to the following: (1) A fine not exceeding $2,500 for the first violation; and (2) A fine not exceeding $7,500 for second and subsequent violations, except for violations of ordinances regulating traffic and parking. ... (F) The follow...
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