Accessory dwelling unit permit — Boston, MA | AccessoryDwellingUnit Solutions

Looking for accessory dwelling unit permit in Boston, MA? Call AccessoryDwellingUnit Solutions 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 budget. The biggest factor is whether you choose a prefabricated unit or a custom build on-site. Site preparation is also significant; if your land requires extensive grading, utility trenching, or foundation work, costs will climb. Your choice of finishes—like kitchen cabinetry, flooring, and siding materials—also shifts the bottom line. We help you navigate these variables to find a setup that fits your property. Exact pricing confirmed free on the call.

About this service

An accessory dwelling unit permit is the formal authorization required from your local municipality to legally construct or legalize an ADU on your property. The application process usually involves submitting detailed site plans and building blueprints for review. This ensures the structure meets all health, safety, and zoning standards for your area. Costs for the permit process vary based on local government fees and professional design services. Exact pricing confirmed free on the call.

Frequently asked in Boston

How can I find affordable accessory dwelling units in Boston?

What makes a backyard accessory dwelling unit a good option in Boston?

A backyard accessory dwelling unit in Boston offers a private, self-contained living space. It's ideal for family members or rental income. You'll need to consider zoning laws, setbacks, and yard access. Professionals can assess your yard's suitability and design a unit that fits. We can help you find the right builder for this project.

What accessory dwelling unit services are available in Boston?

What are accessory dwelling unit homes like in Boston?

Accessory dwelling unit homes in Boston are secondary housing units on a property. They can be attached or detached, offering flexible living arrangements. These units provide additional rental income or space for family. They are a smart way to enhance property value in a high-demand market. We can help you explore design possibilities.

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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, North End, South End, Charlestown, Fenway — and every surrounding area.