Accessory Structures in Flint, MI (2026)
5 verified accessory structures rules for Flint, Michigan, sourced directly from the municipal code and official government pages.
Verified from official government sources
ADU Rules
Flint is a home-rule city in Genesee County (population approximately 81,000) operating under a comprehensive Zoning Ordinance rewrite codified at Chapter 50 of the Flint City Code on Municode (https://library.municode.com/mi/flint), adopted in 2018 as a hybrid form-based code implementing the Imagine Flint Master Plan. Michigan has no statewide accessory dwelling unit preemption statute; ADU permissibility, owner-occupancy requirements, density caps, and design standards in Flint are determined entirely by Chapter 50 under the Michigan Zoning Enabling Act (MCL 125.3201 et seq.). Property owners must consult the Zoning Ordinance and the Flint Department of Planning and Development (Zoning Administrator) for whether ADUs (referred to in form-based codes variously as accessory dwelling units, accessory apartments, or carriage houses) are permitted by right, by special land use, or by variance in the applicable transect or character zone.
Flint MI ADU Rules (Flint Zoning Ordinance Ch. 50, 2018 Form-Based Code; MCL 125.3201; No State ADU Preemption)
Some RestrictionsADU Permits
An accessory dwelling unit in Flint requires permits from two municipal tracks: a zoning approval from the Flint Department of Planning and Development confirming the ADU is permitted in the underlying transect or character district under Chapter 50 (either by right, by special land use through the Planning Commission, or by variance through the Zoning Board of Appeals); and a building permit from the Flint Building Official under the Michigan Single State Construction Code at MCL 125.1513 for the construction itself. Michigan has no statewide ADU preemption like California's Gov. Code 65852.2 or Oregon's HB 2001, so timelines, fees, and approval criteria are set by Flint and the Michigan Single State Code.
Flint MI ADU Permits (Flint Planning and Development; MCL 125.1513 Building Permit; Zoning + Building Both Required)
Some RestrictionsADU Impact Fees
Michigan municipalities lack explicit statutory authority to impose impact fees on new residential development. Unlike states with impact fee enabling acts (e.g., Florida's Impact Fee Act, Colorado C.R.S. 29-20-104.5), Michigan has not enacted a general impact fee statute, and Michigan Supreme Court doctrine in Bolt v. City of Lansing, 459 Mich. 152 (1998), draws a strict constitutional line between regulatory fees (permitted) and disguised taxes (prohibited under the Headlee Amendment without voter approval). As a result, Flint's typical ADU-related charges are limited to standard zoning and building permit fees plus water/sewer connection fees if separate service is established. Flint has not adopted a residential impact fee.
Flint MI ADU Impact Fees (Michigan Headlee/Bolt Limits on Municipal Fees; No Statutory Impact Fee Authority)
Few RestrictionsShed Rules
Sheds and similar accessory structures in Flint are regulated through two layers: (1) the Flint Zoning Ordinance at Chapter 50 of the Flint City Code, which sets dimensional standards (size, height, setbacks, lot coverage, location relative to the principal dwelling) by transect or district; and (2) the Michigan Residential Code adopted under the Stille-DeRossett-Hale Single State Construction Code Act (MCL 125.1501 et seq.), which under Section R105.2 generally exempts one-story detached accessory structures used as tool and storage sheds with a floor area of 200 square feet or less from building permits. The zoning permit / zoning compliance review through the Flint Department of Planning and Development is still required even when no building permit is needed.
Flint MI Shed Rules (Flint Zoning Ch. 50 Accessory Structure Standards; MI Residential Code 200 sq ft Permit Threshold)
Some RestrictionsGarage Conversions
Converting a Flint garage into habitable space (a bedroom, in-law suite, home office, or ADU) requires both (1) zoning approval under the Flint Zoning Ordinance at Chapter 50 for the change of use, because the converted space is no longer accessory parking and may count toward floor area, trigger ADU classification, or affect the underlying district's parking minimums; and (2) a building permit under the Michigan Single State Construction Code (MCL 125.1501 et seq.) administered locally by the Flint Building Official. Converted habitable space must meet the Michigan Residential Code provisions adopted from the IRC, including emergency egress (IRC R310), minimum ceiling height (IRC R305), smoke and carbon monoxide alarms (IRC R314/R315), and light/ventilation (IRC R303).
Flint MI Garage Conversions (Flint Zoning Ch. 50 Change-of-Use; MI Residential Code Building Permit Required)
Some RestrictionsLooking for Genesee County county-wide rules?
County ordinances apply to unincorporated areas and may supplement Flint city rules.
Accessory Structures in Genesee County →