Adu services — Boston, MA | AccessoryDwellingUnit Pros

Looking for adu services in Boston, MA? Call AccessoryDwellingUnit Pros 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 custom project, so costs vary based on your specific choices. Site conditions are the biggest factor; if your land requires significant grading, utility extensions, or foundation work, those expenses add up quickly. Choosing high-end finishes, custom cabinetry, or complex roof lines will also push the budget higher compared to a standard design. Prefabricated units often offer predictable costs, while custom site-built structures allow for more flexibility but can be harder to estimate upfront. Exact pricing confirmed free on the call.

About this service

ADU services simplify the complex process of turning unused yard space into a functional, independent living unit. This involves architectural drafting, structural engineering, and managing municipal building departments to secure necessary approvals. You should look for these services when you are ready to expand your home’s footprint for rental income, guest accommodations, or multi-generational living. Engaging experts ensures the project stays compliant with state codes while meeting your specific design goals for a secondary dwelling.

Frequently asked in Boston

What are the disadvantages of ADUs?

Disadvantages can include the upfront cost of construction and potential for increased property taxes. You might also face neighborhood concerns or lengthy permitting processes in a city like Boston. However, these are often outweighed by the benefits of added living space or rental income. The pros can help you weigh these factors for your specific situation.

How much does an ADU cost in Massachusetts?

What are the rules for ADUs in California?

California has specific statewide ADU laws, but Boston operates under its own local ordinances. These Boston rules dictate things like minimum lot size and owner-occupancy requirements. It's crucial to check the most current Boston zoning code. A quick call can clarify what applies to your Boston property.

Is ADU allowed in Maryland?

Maryland has varying ADU regulations depending on the specific county or municipality. While this service focuses on Boston, it's important to note that local rules are paramount. If you're in the Boston area, we can provide specific guidance. Understanding these local rules is essential for any ADU project.

What are the rules for ADU in California?

California's ADU laws are designed to encourage their construction, often streamlining the permitting process. However, Boston has its own distinct set of regulations that you must follow. These Boston-specific rules are what the local pros are experts in. Getting a local perspective is vital for your Boston ADU.

While California has offered grants, Boston and Massachusetts have their own incentive programs or financing options. The availability and specifics of these can change. The best way to find out about any current programs applicable to Boston is to speak with an expert. They can guide you on potential funding for your project.

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, South End, Beacon Hill, Jamaica Plain, Dorchester, Roxbury — and every surrounding area.