Complete 2026 cost breakdown: construction, permits, financing, and expected rental ROI.
Calculate your Kansas City ADU cost →Building an ADU in Kansas City costs between $90,000-$200,000 for new construction, with per-square-foot costs averaging $150-$300. These figures include design, permitting, site preparation, and construction. The most affordable option is a garage conversion at $60,000-$150,000, while prefab/modular ADUs fall in between at $75,000-$150,000.
| Cost Category | Estimated Range |
|---|---|
| Architectural Plans | $3,000 – $15,000 |
| Permits & Fees | Residential building permit = $483 + $1.41 per $1,000 of valuation over $100,000 (City fee calculator; Building Code Sec. 18-20): about $554 on a $150,000 ADU or $624 on $200,000, plus separate electrical, plumbing and mechanical permits. |
| Impact Fees | No general impact fee, but the Arterial Street Impact Fee (Ch. 39, Sec. 39-4) is charged at building-permit issuance for new residential construction inside eight benefit districts (growth areas, mainly the Northland and south KC); ask the Permits Division whether your parcel is in a district and how an ADU is assessed. |
| Site Prep & Foundation | $10,000 – $35,000 |
| Framing & Structure | $15,000 – $45,000 |
| Plumbing | $8,000 – $20,000 |
| Electrical | $5,000 – $15,000 |
| HVAC | $3,000 – $8,000 |
| Interior Finishes | $15,000 – $40,000 |
Quotes for the same ADU commonly vary 20–40% between builders. We pass your request to up to 5 local builders serving Kansas City, where we have them — free, no obligation.
Get Kansas City builder quotes →Permit fees in Kansas City are Residential building permit = $483 + $1.41 per $1,000 of valuation over $100,000 (City fee calculator; Building Code Sec. 18-20): about $554 on a $150,000 ADU or $624 on $200,000, plus separate electrical, plumbing and mechanical permits.. The review timeline is Plans Review's published goal for one- and two-family reviews is 7 business days per cycle (resubmittals 10 business days); allow 3-8 weeks to permit including one resubmittal (estimate). The 2x-fee priority review is not offered for one- and two-family projects., with plan check: Included in the building-permit review; the City calculator lists no separate residential plan-check fee. Express review by appointment under IB115; a staked, sealed survey is required with the plans since 1-1-2024 (IB100).. Impact fees are No general impact fee, but the Arterial Street Impact Fee (Ch. 39, Sec. 39-4) is charged at building-permit issuance for new residential construction inside eight benefit districts (growth areas, mainly the Northland and south KC); ask the Permits Division whether your parcel is in a district and how an ADU is assessed.. Pre-approved plans: Yes: 7 free Pre-Approved Housing Master Plans including an 'ADU Over Garage' and a 'Tiny House'. You still submit a site plan and survey, pull each trade permit, and have a mechanical contractor design the HVAC (IB171)..
| 1-Bedroom Rent | $1,100-$1,300/month |
| 2-Bedroom Rent | $1,350-$1,550/month |
| Annual Rental Income (est.) | $14,400/year |
| Payback Period (est.) | 10.1 years |
| Short-Term Rental | Yes, only as a 'resident short-term rental': non-resident STRs are prohibited in every R district (88-321, Ord. 230267, passed 5-4-2023). |
| Overall ROI Estimate | 6-10% gross (estimate) |
A typical ADU in Kansas City generates approximately $14,400 per year in rental income based on average 1-bedroom rents. At an average construction cost of $145,000, the estimated payback period is 10.1 years — before accounting for the resale value the ADU adds, which an appraiser determines from comparable sales in Kansas City and varies by market (often less than build cost).
1. Garage conversions save 40-60% vs new construction since the shell already exists. Average cost in Kansas City: $60,000-$150,000.
2. Prefab/modular ADUs offer predictable pricing and faster timelines. Average: $75,000-$150,000.
3. Pre-approved plans — available in Kansas City, which can save $3,000-$10,000 in design costs and 2-3 months in review time. See which cities offer pre-approved ADU plans.
4. State grants — California's CalHFA ADU grant (up to $40K) is currently paused; check calhfa.ca.gov/adu for status and your state for active programs.
5. Get multiple bids — ADU contractor pricing varies 20-40% for the same project. We recommend getting at least 3 quotes.
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