Adu Company in Boston, MA | AccessoryDwellingUnit Direct

Looking for adu company in Boston, MA? Call AccessoryDwellingUnit Direct 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 variables that shift your total investment. The footprint size and complexity of the architectural design are primary factors. Are you planning a detached unit that requires new utility trenching, or is this a garage conversion that uses existing plumbing? Site accessibility, soil conditions, and your choice of finishes—like luxury flooring versus standard options—also play significant roles. Permitting fees vary widely depending on your local municipality and current zoning requirements. Exact pricing confirmed free on the call.

About this service

A professional ADU company manages the entire project lifecycle, from initial design and permit filings to the final structural inspection. We act as your project partner, ensuring that your vision meets all legal requirements while avoiding common pitfalls in construction. You need a team that handles the heavy lifting so you can focus on how you will use the space. We provide the expertise to get your project across the finish line. Exact pricing confirmed free on the call.

Frequently asked in Boston

What are the disadvantages of ADUs in Massachusetts?

In Massachusetts, disadvantages can include upfront construction costs and potential impacts on your existing property's yard space. You might also face local zoning hurdles, though regulations are becoming more ADU-friendly. It's crucial to discuss these with a local pro to see how they apply to your specific situation and property in Boston.

How much does an ADU cost in Massachusetts?

What are the rules for ADUs in California?

While we focus on Massachusetts, California has specific ADU laws designed to encourage their creation. These often include streamlined permitting processes and limitations on local government's ability to deny ADU applications. It's always best to check the most current state and local ordinances for any region you're interested in.

Is an ADU allowed in Maryland?

Maryland, like many states, has varying ADU regulations by county and municipality. Some areas are very supportive, while others have stricter rules regarding size, owner-occupancy, and placement. If you're considering an ADU in Maryland, it's essential to research the specific local zoning codes.

What are the rules for ADU in California?

California's ADU laws generally aim to make it easier to build accessory dwelling units. They often include statewide standards for minimum unit sizes, setbacks, and owner-occupancy requirements. Local jurisdictions can have additional rules, but they're often limited in how much they can restrict ADU development.

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, West Roxbury — and every surrounding area.