Missouri ADU Laws & Rules by City (2026)

Key Missouri ADU Laws

Missouri ADU Overview

1 cities currently covered with detailed ADU zoning data
Average ADU-friendliness score: 7.0/10
Rules vary by city — check individual city pages for details
We're actively expanding coverage in Missouri

What changed recently in Missouri

Gathered from the 1 city below, with the bill or ordinance each one names. Statewide measures are listed once with the cities they reached, rather than repeated for each.

City by city

Kansas City: Ordinance 220698 (passed Sept 15, 2022): ADUs legalized citywide by right — 800 sq ft cap, 5-ft setbacks, no parking requirement, owner-occupancy with deed restriction
Kansas City: May 2023 short-term rental overhaul: non-resident STRs banned in residential zones; registration required before listing (effective June 15, 2023)
Kansas City: The owner-occupancy requirement was flagged for a post-passage review; no amendment removing it had been adopted as of July 2026

What the rules actually look like across Missouri

Statewide law sets a floor; the numbers that decide your project are local. Here is the spread across the 1 Missouri city covered here, taken from each city's own ordinance rather than a state summary.

Question	Across Missouri
Are ADUs permitted?	1 of 1 permit them.
Detached size cap	Median 800 sq ft, from 800 to 800 sq ft across the 1 cities publishing a numeric cap.
Owner-occupancy	Required in 1 of 1.
Build cost	$100,000 to $300,000 depending on city and unit type.

Recomputed whenever a city page changes, so this and the city pages below cannot disagree.

Missouri Cities ADU Comparison

City	Max Size	Setbacks	Permit Fees	Build Cost	1BR Rent	Score
Kansas City	800 sq ft floor area max; footprint also capped at 60% of the main home's footprint or 25% of the rear yard, whichever is smaller	5 feet from all property lines (including projections)	$1,500-$5,000 typical, valuation-based (estimate) - Confirm against the current KCMO fee schedule	$100,000-$300,000	$1,100-$1,300/mo	7/10

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Missouri ADU Laws & Rules (2026)