Accessory dwelling unit services — Boston, MA | AccessoryDwellingUnit Services

Looking for accessory dwelling unit services in Boston, MA? Call AccessoryDwellingUnit Services 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 involves several moving parts that shape your total investment. The final figure depends heavily on whether you choose a prefab unit or a custom build from the ground up. Site conditions are another major factor; if your property requires extensive grading, utility trenching, or foundation work, costs will climb. You also have to consider your choice of finishes, like high-end appliances or custom cabinetry. Navigating local permit fees and impact assessments also adds to the total.

About this service

These services cover the end-to-end process of adding a secondary home to your property. This includes initial zoning checks, architectural design, permit filing, and final construction. You need these services when you want to create a separate living space for family, guests, or as a rental unit, but don’t want to manage the complex legal and structural requirements on your own.

Frequently asked in Boston

What are the disadvantages of ADUs in Boston?

Common disadvantages include the upfront construction costs and the potential for increased utility bills. There can also be impacts on your existing yard space and privacy. Understanding these helps in planning a successful ADU project in a compact Boston neighborhood.

How much does an ADU cost in Massachusetts?

What are the rules for ADUs in California?

While this service is for Boston, Massachusetts, California has specific statewide ADU laws designed to encourage their development. These often include streamlined permitting processes and limitations on local government restrictions. It's always best to check your local city or county ordinances for the most precise information.

Is ADU allowed in Maryland?

ADUs are permitted in many areas of Maryland, though regulations can vary significantly by county and municipality. Baltimore and its surrounding areas have specific zoning ordinances that govern ADU construction. You'll need to consult your local planning department for exact rules.

What are the rules for ADU in California?

California has state laws that preempt many local restrictions on ADUs, aiming to increase housing availability. These rules often cover minimum lot sizes, owner occupancy requirements, and impact fees. Local jurisdictions still have some say, so checking both state and local guidelines is crucial.

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