Missouri

Missouri's major metro areas are embracing accessory dwelling units as a practical housing tool. Kansas City and St. Louis have updated their zoning codes to allow ADUs, and interest is growing in smaller communities. ADU Pass helps Missouri property owners manage the permit process from start to finish.

1,440 ZIP codes
115 Counties
806 Cities

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State ADU details

State financing programs

Missouri Housing Development Commission (MHDC), the state housing finance agency under the Department of Economic Development, does not operate an ADU-specific loan or grant product as of 2026-04-26. Construction or rehab of an ADU on a primary residence may be financed indirectly through MHDC's First Place Program (first-time-homebuyer mortgage with below-market rate) or Next Step Program (mortgage paired with a forgivable second of up to 4% of loan amount). Both are mortgage-purchase products and require the property to be the borrower's primary residence; an existing ADU on the property is permitted under standard agency guidelines. MHDC also administers Low-Income Housing Tax Credits, the Affordable Housing Assistance Program (AHAP) tax credit, and federal HOME funds — none of which is a homeowner-facing ADU instrument.

checked 2026-04-26

State insurance regimes

Missouri operates the Missouri Property Insurance Placement Facility, commonly known as the Missouri FAIR Plan (MFPIA), established in October 1969 under RSMo Chapter 379 and overseen by the Missouri Department of Commerce and Insurance. The plan is the residual market insurer for property owners unable to obtain coverage in the voluntary admitted market. MFPIA writes Dwelling Property (owner- and tenant-occupied, plus vacant), sinkhole-on-dwelling endorsements, commercial property, and farm property on an actual-cash-value basis. Eligible perils include fire, lightning, wind, hail, riot, vehicles, smoke, vandalism, and malicious mischief — it is a basic-form policy, not a comprehensive HO. ADUs in Missouri typically ride on the primary dwelling's homeowners policy as 'other structures' coverage (commonly 10% of Coverage A); when rented to a tenant, a separate dwelling-fire (DP-1 or DP-3) policy or landlord endorsement is the standard treatment. Missouri is not a hurricane-coastal state and has no wind-pool. Tornado / convective-storm risk is significant but is handled through the standard admitted homeowners market with rate adjustments, not a residual mechanism.

checked 2026-04-26

Known state issues (2)

  • policy-review (since 2024-01) — ADU permittability remains a city-by-city patchwork. Major metros (Kansas City, St. Louis, Columbia, Springfield) have moved toward permissive ordinances; suburban and rural jurisdictions are largely silent or restrictive. (source)
  • other (since 2023-01) — Even though Missouri has no wind pool, ADU owners in convective-storm zones can see the primary-dwelling carrier non-renew or apply restrictive endorsements after a hail loss. The MFPIA is the residual-market backstop. (source)
Federal (United States) — ADU-relevant rules and programs

Federal ADU law

The United States has no federal statute that directly regulates accessory dwelling unit entitlement or design. Land-use authority over ADUs resides with states and local governments under the traditional police power. Federal engagement is limited to financing (Fannie/Freddie/FHA/VA/USDA), flood insurance (FEMA/NFIP), and discretionary housing programs (HUD), which are recorded in sibling sections of this file.

checked 2026-04-20

Federal financing programs

Federal housing-finance agencies and GSEs set nationwide underwriting rules that govern whether an ADU can be financed, appraised, and counted toward mortgage qualifying income. The relevant actors are Fannie Mae, Freddie Mac, FHA (HUD), VA, and USDA Rural Development.

checked 2026-04-20

Federal tax credits

There is no ADU-specific federal tax credit. ADUs may incidentally qualify for existing federal energy-efficiency and clean-energy tax credits when the ADU construction includes qualifying measures.

checked 2026-04-20

Federal housing programs

HUD administers several discretionary programs that can fund ADU-related activity at the grantee's election, but none is an ADU-specific program.

checked 2026-04-20

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