Adu company — Boston, MA | AccessoryDwellingUnit Pros

Looking for adu company 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

An ADU company manages the transition from your initial concept to a finished, livable space. This involves design, permitting, and the actual construction work needed to get your project across the finish line. Choosing the right partner means finding a team that handles the technical complexities of zoning and utility infrastructure so you don't have to navigate those hurdles alone. Exact pricing confirmed free on the call.

Frequently asked in Boston

What are the disadvantages of ADUs in Boston?

Disadvantages can include zoning restrictions, which vary by Boston neighborhood. Parking requirements are also a significant consideration in a city with limited street parking. The upfront cost of construction can be substantial, and you might face challenges with utility hookups. It's worth discussing these potential hurdles with a local pro.

How much does an ADU cost in Massachusetts?

What are the rules for ADUs in California?

California has statewide ADU laws, but specific regulations can vary by city. Generally, these laws aim to streamline ADU development. They often set minimum lot sizes and limit owner-occupancy requirements. However, since you're in Boston, MA, the California rules won't apply to you.

Is ADU allowed in Maryland?

Yes, ADUs are allowed in many areas of Maryland, though specific rules depend on the county or municipality. Baltimore has its own zoning ordinances that dictate ADU allowances. It's best to consult with a local expert who understands these specific Maryland regulations.

What are the rules for ADU in California?

It was designed to offset some of the initial costs. However, this specific grant was for California residents. For ADU funding options in Massachusetts, it's best to inquire with local resources.

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, Jamaica Plain, Dorchester — and every surrounding area.