Accessory dwelling unit new hampshire

Looking for accessory dwelling unit new hampshire 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

Frequently asked in Boston

What are the disadvantages of ADUs in Boston?

How much does an ADU cost in Massachusetts?

Costs for ADUs in Massachusetts vary significantly based on size, materials, and site conditions. Factors like foundation type and utility hookups play a big role. Getting a personalized quote from a local pro is the best way to understand the investment for your Boston property.

What are the rules for ADUs in California?

California has specific state laws encouraging ADUs, often streamlining the approval process with statewide standards. However, local jurisdictions can still have their own rules. This question is about California, but for Boston, you'll need to focus on Massachusetts and Boston-specific ordinances.

Is an ADU allowed in Maryland?

Maryland has been expanding ADU allowances, with many counties and cities implementing new regulations. Rules can differ significantly from one jurisdiction to another within the state. This information is relevant to Maryland, but for Boston, we focus on local Massachusetts codes.

What are the rules for ADU in California?

California's ADU laws aim to make building easier, often setting maximums for permit review times and minimum unit sizes. Local governments must comply with state mandates, though some local specifics remain. This is about California, while Boston follows Massachusetts and city-specific regulations.

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, Fenway — and every surrounding area.