Junior ADU (JADU) ADU Cost
A junior ADU is carved out of the existing home (up to 500 sq ft), often a converted bedroom with an efficiency kitchen. Lowest cost and fastest, but smaller and usually requires owner-occupancy.
Nationally a junior adu (jadu) ADU runs $100–$180/sq ft turnkey. Below is a 600 sq ft example for every state, adjusted for local construction costs.
| State | 600 sq ft estimate | $/sq ft |
|---|---|---|
| Mississippi | $50,000–$89,500 | $83–$149 |
| Arkansas | $50,500–$90,500 | $84–$151 |
| Alabama | $51,000–$92,000 | $85–$153 |
| Oklahoma | $51,500–$93,000 | $86–$155 |
| South Carolina | $52,000–$94,000 | $87–$157 |
| North Carolina | $53,000–$95,000 | $88–$158 |
| Tennessee | $53,000–$95,000 | $88–$158 |
| Kansas | $53,000–$95,000 | $88–$158 |
| Louisiana | $53,000–$95,000 | $88–$158 |
| Georgia | $54,000–$97,000 | $90–$162 |
| Kentucky | $54,000–$97,000 | $90–$162 |
| Nebraska | $54,000–$97,000 | $90–$162 |
| New Mexico | $54,000–$97,000 | $90–$162 |
| South Dakota | $54,000–$97,000 | $90–$162 |
| West Virginia | $54,000–$97,000 | $90–$162 |
| Texas | $55,000–$99,500 | $92–$166 |
| Indiana | $55,000–$99,500 | $92–$166 |
| Iowa | $55,000–$99,500 | $92–$166 |
| Missouri | $55,000–$99,500 | $92–$166 |
| Florida | $57,000–$102,500 | $95–$171 |
| Ohio | $57,000–$102,500 | $95–$171 |
| Michigan | $57,000–$102,500 | $95–$171 |
| Idaho | $57,000–$102,500 | $95–$171 |
| North Dakota | $57,000–$102,500 | $95–$171 |
| Wyoming | $57,000–$102,500 | $95–$171 |
| Montana | $59,000–$106,000 | $98–$176 |
| Utah | $59,000–$106,000 | $98–$176 |
| Arizona | $59,000–$106,000 | $98–$176 |
| Virginia | $59,000–$106,000 | $98–$176 |
| Delaware | $60,000–$108,000 | $100–$180 |
| Wisconsin | $60,000–$108,000 | $100–$180 |
| Maine | $61,000–$110,000 | $102–$184 |
| Pennsylvania | $61,000–$110,000 | $102–$184 |
| Nevada | $61,000–$110,000 | $102–$184 |
| New Hampshire | $63,000–$113,500 | $105–$189 |
| Vermont | $63,000–$113,500 | $105–$189 |
| Colorado | $63,000–$113,500 | $105–$189 |
| Minnesota | $63,000–$113,500 | $105–$189 |
| Maryland | $63,000–$113,500 | $105–$189 |
| Oregon | $65,000–$116,500 | $108–$194 |
| Washington | $66,000–$119,000 | $110–$198 |
| Illinois | $66,000–$119,000 | $110–$198 |
| Rhode Island | $67,000–$121,000 | $112–$202 |
| Connecticut | $69,000–$124,000 | $115–$207 |
| New Jersey | $69,000–$124,000 | $115–$207 |
| Massachusetts | $72,000–$129,500 | $120–$216 |
| New York | $72,000–$129,500 | $120–$216 |
| Washington DC | $72,000–$129,500 | $120–$216 |
| California | $75,000–$135,000 | $125–$225 |
| Alaska | $78,000–$140,500 | $130–$234 |
| Hawaii | $81,000–$146,000 | $135–$243 |
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Other ADU types
Estimates are for planning only and are based on regional construction-cost indices and published statewide ADU statutes. Local ordinances, lot conditions and contractor pricing vary — always confirm with your city planning department and a licensed contractor.