Last updated: September 24, 2026
What affects the price
Building an ADU is a major project, and the final bill depends on a few key things. Site prep is a big factor; if your land is sloped or needs extensive utility connections, costs go up. The materials you choose—from siding to kitchen finishes—also change the math significantly. Whether you’re building a detached unit or converting an existing garage shifts the permit requirements and structural work needed. We provide exact pricing confirmed free on the call.
Frequently asked in Boston
What are the disadvantages of ADUs in Boston?
Disadvantages can include upfront construction costs and potential impacts on existing property lines. In dense areas like Boston, securing adequate parking for an ADU can also be a consideration. It's important to weigh these against the benefits of increased property value and rental income potential.
How much does an ADU cost in Massachusetts?
ADU costs in Massachusetts vary widely based on size, materials, and site preparation. Factors like foundation type, utility hookups, and finishes will influence the final price. The best way to get an accurate idea for your specific Boston location is to get a personalized quote.
What are the rules for ADUs in California?
California has state-level ADU laws encouraging their development, often streamlining local approval processes. These rules typically include size limits and setback requirements. For Boston, specific Massachusetts and city regulations will apply, which differ from California's.
Is ADU allowed in Maryland?
Yes, ADUs are generally allowed in Maryland, with specific regulations varying by county and municipality. Baltimore, for example, has its own set of rules. It's crucial to check the local ordinances where you plan to build.
What are the rules for ADU in California?
California's ADU laws aim to make building easier, with statewide standards for size, setbacks, and owner occupancy. Many cities have adopted these but may have additional local requirements. These differ from the regulations you'll find in Boston.
California has offered grants to help offset ADU costs, particularly for affordable housing initiatives. These programs are specific to California and its housing goals. For information on potential incentives in Massachusetts or Boston, a local consultation is recommended.
Also serving nearby: Quincy · Cambridge · Lynn · Newton · Brockton
More on this: HUD ADU resources — ADU policy and financing research.
Service area details
Serving all of Boston — population 653,833; about 13,525 residents per square mile across 48.3 sq mi. ZIP codes covered include 02108, 02109, 02110, 02111, 02112, 02113, 02114, 02115.
Neighborhoods served in Boston: Back Bay, Beacon Hill, North End, South End, West End, Charlestown — and every surrounding area.
Areas we serve
Browse by state, then city.
Alabama (4)
All of Alabama · Birmingham · Huntsville · Mobile · Montgomery
Alaska (1)
Arizona (9)
All of Arizona · Chandler · Gilbert · Glendale · Mesa · Peoria · Phoenix · Scottsdale · Tempe · Tucson
Arkansas (1)
California (29)
All of California · Anaheim · Bakersfield · Chula Vista · Elk Grove · Fontana · Fremont · Fresno · Garden Grove · Glendale · Huntington Beach · Lancaster · Los Angeles · Modesto · Moreno Valley · Oakland · Oceanside · Ontario · Oxnard · Palmdale · Rancho Cucamonga · Riverside · Sacramento · San Bernardino · San Diego · San Francisco · San Jose · Santa Clarita · Santa Rosa · Stockton
Colorado (4)
All of Colorado · Aurora · Colorado Springs · Denver · Fort Collins
District of Columbia (1)
Florida (10)
All of Florida · Cape Coral · Fort Lauderdale · Jacksonville · Miami · Orlando · Pembroke Pines · Port St. Lucie · St. Petersburg · Tallahassee · Tampa
Georgia (2)
Hawaii (1)
Idaho (1)
Illinois (2)
Indiana (2)
Iowa (1)
Kansas (2)
Kentucky (2)
All of Kentucky · Lexington-Fayette · Louisville/Jefferson County
Louisiana (3)
Massachusetts (2)
Michigan (2)
Minnesota (2)
Missouri (3)
Nebraska (2)
Nevada (4)
All of Nevada · Henderson · Las Vegas · North Las Vegas · Reno
New Jersey (2)
New Mexico (1)
New York (4)
All of New York · Buffalo · New York · Rochester · Yonkers
North Carolina (7)
All of North Carolina · Cary · Charlotte · Durham · Fayetteville · Greensboro · Raleigh · Winston-Salem
Ohio (4)
All of Ohio · Akron · Cleveland · Columbus · Toledo
Oklahoma (2)
Oregon (3)
All of Oregon · Eugene · Portland · Salem
Pennsylvania (2)
Rhode Island (1)
South Dakota (1)
Tennessee (6)
All of Tennessee · Chattanooga · Clarksville · Knoxville · Memphis · Murfreesboro · Nashville-Davidson metropolitan government (balance)
Texas (16)
All of Texas · Amarillo · Arlington · Austin · Brownsville · Dallas · El Paso · Fort Worth · Frisco · Garland · Grand Prairie · Irving · Laredo · Lubbock · McKinney · Plano · San Antonio
Utah (1)
Virginia (5)
All of Virginia · Chesapeake · Newport News · Norfolk · Richmond · Virginia Beach
Washington (4)
All of Washington · Seattle · Spokane · Tacoma · Vancouver
