Adu Services in Boston, MA | AccessoryDwellingUnit Experts

Looking for adu services in Boston, MA? Call AccessoryDwellingUnit Experts for a contact a provider — no obligation. Licensed adu builders serve Boston and the surrounding area, and you'll get straight answers on timing and what affects the price.

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.

About this service

ADU services are the professional steps required to transform your backyard or garage into a functional living space. This process involves design consultations, structural engineering, and utility connections. You should look into these services if you are ready to increase your property value or need extra living space for relatives. We focus on making sure your project meets all safety codes and neighborhood regulations while fitting the specific design style of your main home.

Frequently asked in Boston

What are the disadvantages of ADUs in Boston?

How much does an ADU cost in Massachusetts?

The cost for an ADU in Massachusetts varies greatly based on size, materials, and site complexity. Factors like foundation type, finishes, and whether you're building a detached unit or converting existing space play a big role. Getting a personalized quote is the best way to understand pricing for your specific needs in the Boston area.

What are the rules for ADUs in California?

California has state-level laws that streamline ADU development, but local cities can still have specific requirements. These often involve lot size, setback rules, and parking mandates. It's crucial to check with your specific city's planning department for exact regulations. We can help you connect with local experts who know these rules.

Is an ADU allowed in Maryland?

Yes, ADUs are generally allowed in Maryland, though regulations differ by county and municipality. Many areas have adopted ordinances to encourage ADUs as a solution for housing affordability. It's essential to verify the specific rules for your location. A quick call can get you advice tailored to your Maryland property.

What are the rules for ADU in California?

California's ADU laws aim to make building easier, often setting minimum standards for size and design. However, local jurisdictions can impose additional requirements regarding setbacks, height, and parking. It’s always best to consult with your city's planning department for the most accurate information. We can help you find the right professionals to navigate these rules.

California has offered grants to help offset the cost of ADU construction, especially for lower-income homeowners. These programs aim to increase the availability of affordable housing. Eligibility and specific grant amounts can change, so it's important to research current offerings. Local experts can often provide information on available incentives.

Also serving nearby: Quincy · Cambridge · Lynn · Newton · Brockton

All cities in Massachusetts →

More on this: HUD ADU resources — ADU policy and financing research.

Service area details

653,833residents

13,525per sq mile

8ZIP codes served

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, South End, North End, Charlestown, Jamaica Plain — and every surrounding area.