ADU Rules & Cost by State

Pick your state to see what an accessory dwelling unit costs there and the rules that apply — size limits, setbacks, parking and owner-occupancy.

States with a statewide ADU law

These states limit what cities can restrict, making an ADU much easier to build.

CaliforniaStatewide law

700 sq ft ADU ≈ $192,500–$315,000

WashingtonStatewide law

700 sq ft ADU ≈ $169,500–$277,000

OregonStatewide law

700 sq ft ADU ≈ $166,500–$272,000

MaineStatewide law

700 sq ft ADU ≈ $157,000–$257,000

New HampshireStatewide law

700 sq ft ADU ≈ $161,500–$264,500

VermontStatewide law

700 sq ft ADU ≈ $161,500–$264,500

MontanaStatewide law

700 sq ft ADU ≈ $151,000–$247,000

ColoradoStatewide law

700 sq ft ADU ≈ $161,500–$264,500

MassachusettsStatewide law

700 sq ft ADU ≈ $185,000–$302,500

Rhode IslandStatewide law

700 sq ft ADU ≈ $172,500–$282,000

UtahStatewide law

700 sq ft ADU ≈ $151,000–$247,000

ArizonaStatewide law

700 sq ft ADU ≈ $151,000–$247,000

States where local zoning governs

Texas

700 sq ft ADU ≈ $141,500–$232,000

Florida

700 sq ft ADU ≈ $146,500–$239,500

New York

700 sq ft ADU ≈ $185,000–$302,500

Georgia

700 sq ft ADU ≈ $138,500–$227,000

North Carolina

700 sq ft ADU ≈ $135,500–$222,000

Illinois

700 sq ft ADU ≈ $169,500–$277,000

Pennsylvania

700 sq ft ADU ≈ $157,000–$257,000

Ohio

700 sq ft ADU ≈ $146,500–$239,500

Michigan

700 sq ft ADU ≈ $146,500–$239,500

Virginia

700 sq ft ADU ≈ $151,000–$247,000

Minnesota

700 sq ft ADU ≈ $161,500–$264,500

Nevada

700 sq ft ADU ≈ $157,000–$257,000

Tennessee

700 sq ft ADU ≈ $135,500–$222,000

Maryland

700 sq ft ADU ≈ $161,500–$264,500

Connecticut

700 sq ft ADU ≈ $177,000–$290,000

New Jersey

700 sq ft ADU ≈ $177,000–$290,000

Hawaii

700 sq ft ADU ≈ $208,000–$340,000

Washington DC

700 sq ft ADU ≈ $185,000–$302,500

Alabama

700 sq ft ADU ≈ $131,000–$214,000

Alaska

700 sq ft ADU ≈ $200,000–$327,500

Arkansas

700 sq ft ADU ≈ $129,500–$211,500

Delaware

700 sq ft ADU ≈ $154,000–$252,000

Idaho

700 sq ft ADU ≈ $146,500–$239,500

Indiana

700 sq ft ADU ≈ $141,500–$232,000

Iowa

700 sq ft ADU ≈ $141,500–$232,000

Kansas

700 sq ft ADU ≈ $135,500–$222,000

Kentucky

700 sq ft ADU ≈ $138,500–$227,000

Louisiana

700 sq ft ADU ≈ $135,500–$222,000

Mississippi

700 sq ft ADU ≈ $128,000–$209,000

Missouri

700 sq ft ADU ≈ $141,500–$232,000

Nebraska

700 sq ft ADU ≈ $138,500–$227,000

New Mexico

700 sq ft ADU ≈ $138,500–$227,000

North Dakota

700 sq ft ADU ≈ $146,500–$239,500

Oklahoma

700 sq ft ADU ≈ $132,500–$216,500

South Carolina

700 sq ft ADU ≈ $134,000–$219,000

South Dakota

700 sq ft ADU ≈ $138,500–$227,000

West Virginia

700 sq ft ADU ≈ $138,500–$227,000

Wisconsin

700 sq ft ADU ≈ $154,000–$252,000

Wyoming

700 sq ft ADU ≈ $146,500–$239,500