Accessory dwelling unit contractor

Looking for accessory dwelling unit contractor 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

A dedicated contractor manages the heavy lifting of your ADU project. This involves hiring skilled tradespeople, ordering materials, and ensuring that every phase of construction passes municipal inspections. You need a contractor when you want a single point of contact to oversee the transition from a vacant backyard area to a fully finished, livable home. They bridge the gap between initial architectural designs and the final move-in date for your new space.

Frequently asked in Boston

What are the disadvantages of ADUs in Boston?

Disadvantages can include the initial construction cost and potential impact on your existing yard space. You'll also need to consider how an ADU might affect your property taxes and utility bills. Understanding these trade-offs is important before you begin planning your project in Boston.

How much does an ADU cost in Massachusetts?

What are the rules for ADUs in California?

California has statewide ADU laws, but specific local ordinances can add further requirements. These often cover setbacks, height limits, and parking. It's essential to check with your specific city's planning department for the most accurate information.

Is ADU allowed in Maryland?

Yes, ADUs are generally allowed in Maryland, with regulations varying by county and municipality. Baltimore, for example, has specific zoning rules that dictate where and how ADUs can be built. Checking local ordinances is crucial.

What are the rules for ADU in California?

California's ADU laws aim to streamline approvals and encourage ADU development. Key aspects include owner-occupancy requirements for some ADUs and limitations on impact fees. Always verify local requirements in your specific California city.

California has offered various grant and loan programs to help homeowners build ADUs, sometimes reaching tens of thousands of dollars. These programs often have specific eligibility criteria and funding availability can change. Research current state and local 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.