Garage conversion ADU Cost
Converting an existing garage into a living unit. The cheapest path because the foundation, walls and roof already exist — you mostly add insulation, plumbing, a kitchen and a bathroom.
Nationally a garage conversion ADU runs $120–$220/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 | $60,000–$109,500 | $100–$183 |
| Arkansas | $60,500–$111,000 | $101–$185 |
| Alabama | $61,000–$112,000 | $102–$187 |
| Oklahoma | $62,000–$113,500 | $103–$189 |
| South Carolina | $62,500–$115,000 | $104–$191 |
| North Carolina | $63,500–$116,000 | $106–$194 |
| Tennessee | $63,500–$116,000 | $106–$194 |
| Kansas | $63,500–$116,000 | $106–$194 |
| Louisiana | $63,500–$116,000 | $106–$194 |
| Georgia | $65,000–$119,000 | $108–$198 |
| Kentucky | $65,000–$119,000 | $108–$198 |
| Nebraska | $65,000–$119,000 | $108–$198 |
| New Mexico | $65,000–$119,000 | $108–$198 |
| South Dakota | $65,000–$119,000 | $108–$198 |
| West Virginia | $65,000–$119,000 | $108–$198 |
| Texas | $66,000–$121,500 | $110–$202 |
| Indiana | $66,000–$121,500 | $110–$202 |
| Iowa | $66,000–$121,500 | $110–$202 |
| Missouri | $66,000–$121,500 | $110–$202 |
| Florida | $68,500–$125,500 | $114–$209 |
| Ohio | $68,500–$125,500 | $114–$209 |
| Michigan | $68,500–$125,500 | $114–$209 |
| Idaho | $68,500–$125,500 | $114–$209 |
| North Dakota | $68,500–$125,500 | $114–$209 |
| Wyoming | $68,500–$125,500 | $114–$209 |
| Montana | $70,500–$129,500 | $118–$216 |
| Utah | $70,500–$129,500 | $118–$216 |
| Arizona | $70,500–$129,500 | $118–$216 |
| Virginia | $70,500–$129,500 | $118–$216 |
| Delaware | $72,000–$132,000 | $120–$220 |
| Wisconsin | $72,000–$132,000 | $120–$220 |
| Maine | $73,500–$134,500 | $122–$224 |
| Pennsylvania | $73,500–$134,500 | $122–$224 |
| Nevada | $73,500–$134,500 | $122–$224 |
| New Hampshire | $75,500–$138,500 | $126–$231 |
| Vermont | $75,500–$138,500 | $126–$231 |
| Colorado | $75,500–$138,500 | $126–$231 |
| Minnesota | $75,500–$138,500 | $126–$231 |
| Maryland | $75,500–$138,500 | $126–$231 |
| Oregon | $78,000–$142,500 | $130–$238 |
| Washington | $79,000–$145,000 | $132–$242 |
| Illinois | $79,000–$145,000 | $132–$242 |
| Rhode Island | $80,500–$148,000 | $134–$246 |
| Connecticut | $83,000–$152,000 | $138–$253 |
| New Jersey | $83,000–$152,000 | $138–$253 |
| Massachusetts | $86,500–$158,500 | $144–$264 |
| New York | $86,500–$158,500 | $144–$264 |
| Washington DC | $86,500–$158,500 | $144–$264 |
| California | $90,000–$165,000 | $150–$275 |
| Alaska | $93,500–$171,500 | $156–$286 |
| Hawaii | $97,000–$178,000 | $162–$297 |
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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.