Kansas City legalized ADUs citywide in September 2022 (Ordinance 220698): attached or detached ADUs are allowed by right on any lot where a detached house is the principal building, with no public hearing and no extra parking. The trade-offs are a hard 800 sq ft cap, rear-yard placement for detached units, and an owner-occupancy requirement recorded as a deed restriction. The city also publishes free pre-approved plans, including an ADU-over-garage design.
Zoning & Size Requirements [1][2]
Yes — Kansas City allows ADUs. A detached ADU can typically be up to 800 sq ft under current Missouri and Kansas City zoning rules.
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| Allowed Zones | Any lot with a detached single-family dwelling as the principal building (citywide, all residential districts) — Sec. 88-305-15 |
| Max Size (Detached) | 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 |
| Max Size (Attached) | 800 sq ft or 90% of the principal dwelling's floor area, whichever is smaller |
| Max Size (JADU) | Not a separate category in Kansas City's code |
| Max Height | Height of the principal building or 25 ft, whichever is less |
| Max Units | 1 ADU per lot |
Setback Requirements [1][2]
Kansas City requires a rear setback of about 5 ft for a detached ADU, and no additional parking is required. Owner-occupancy is required.
| Rear Setback | 5 feet from all property lines (including projections) |
| Side Setback | 5 feet including projections; street-side: 5 ft or the principal building's setback, whichever is greater |
| Front Setback | Detached ADUs must be in the rear yard; attached ADUs follow the main home's front setback |
| Parking Required | No additional off-street parking required |
| Owner Occupancy | Required — owner must live in the main home or the ADU, recorded as a deed restriction |
| Min Lot Size | None stated - the footprint/rear-yard percentage caps do the work |
Permit Process & Fees [3]
An ADU permit in Kansas City typically costs $1,500-$5,000 typical, valuation-based (estimate) - Confirm against the current KCMO fee schedule and takes 4-12 weeks plan review (estimate) - Confirm with City Planning & Development, through a standard permit review.
| Approval Process | By right (accessory use) — standard building permit + trade permits through City Planning & Development; no special use permit or public hearing |
| Review Timeline | 4-12 weeks plan review (estimate) - Confirm with City Planning & Development |
| Permit Fees | $1,500-$5,000 typical, valuation-based (estimate) - Confirm against the current KCMO fee schedule |
| Impact Fees | Varies - confirm with City Planning & Development |
| Plan Check | 4-8 weeks |
| Pre-Approved Plans | Yes — free Pre-Approved Housing Master Plans, including an ADU-over-garage design (trade permits still required) |
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Construction Costs [4]
Building an ADU in Kansas City typically costs $100,000-$300,000 ($150-$300 per sq ft); a garage conversion runs $80,000-$150,000.
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| Average Build Cost | $100,000-$300,000 |
| Cost per Sq Ft | $150-$300 |
| Garage Conversion | $80,000-$150,000 |
| Prefab ADU (Installed) | $90,000-$180,000 |
Finance Your ADU Project
Most ADU projects are funded through HELOCs, construction loans, or cash-out refinancing. Compare rates from top lenders.
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Rental Income Potential [5]
A 2-bedroom ADU in Kansas City rents for around $1,300-$1,500/mo, an estimated 6-8% annual return.
| Avg Rent (1 Bedroom) | $1,100-$1,300/mo |
| Avg Rent (2 Bedroom) | $1,300-$1,500/mo |
| Short-Term Rental | Restricted — owner-occupied registration required citywide; whether the ADU itself can be the STR is ambiguous in code (Type 1 rules reference the principal building) — confirm with the city |
| Est. Annual ROI | 6-8% annual return |
Explore Prefab ADU Options
Prefab ADUs can save 20-40% vs. traditional construction and cut build time in half.
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Recent Law Changes
What's Changed Recently
- 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
- May 2023 short-term rental overhaul: non-resident STRs banned in residential zones; registration required before listing (effective June 15, 2023)
- The owner-occupancy requirement was flagged for a post-passage review; no amendment removing it had been adopted as of July 2026
Tips for Building an ADU in Kansas City
- Use the city's free Pre-Approved Housing Master Plans (there's an ADU-over-garage design) to cut design costs and review time
- The 800 sq ft cap plus the 60%-footprint/25%-rear-yard rules mean small lots should verify footprint math before designing
- Owner-occupancy is recorded as a deed restriction — factor it into resale and financing plans
- If you're planning short-term rental income, confirm ADU-as-STR eligibility with the city first — the code language is ambiguous
ADU Builders in Kansas City
Looking for an ADU builder in Kansas City? ADU projects need a contractor experienced with local zoning, the permit process, and utility connections — not every general contractor has built one. We match Kansas City homeowners with experienced local ADU contractors who provide free, no-obligation quotes. Getting at least three bids typically saves 20-40% on the same scope.
Sources & References
All data on this page is sourced from official government records and verified market data. View our full methodology.
- Ordinance 220698 — ADU amendments to Chapter 88 (KC City Clerk/Legistar) Government Data — Accessed 2026-07-28
- KCMO Zoning Code Sec. 88-810-005 — Accessory Dwelling Unit (Municode) Government Data — Accessed 2026-07-28
- KCMO Pre-Approved Housing Master Plans Planning Department — Accessed 2026-07-28
- HomeGuide — ADU Cost Data (2026) Market Data — Accessed 2026-07-28
- HUD FY2026 Fair Market Rents — Kansas City MO-KS HMFA Government Data — Accessed 2026-07-28
- KCMO Sec. 88-321 — Short Term Rental Regulations Government Data — Accessed 2026-07-28
Frequently Asked Questions
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