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.
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Frequently asked in Boston
What are the disadvantages of ADUs in Boston?
In Boston, disadvantages can include the complexity of permitting due to historic district regulations and the potential for increased utility costs. Neighbor perception and integration into existing neighborhood aesthetics are also factors to consider. Understanding these challenges upfront is key to a successful project.
How much does an ADU cost in Massachusetts?
What are the rules for ADUs in California?
While you're in Massachusetts, California has specific state laws encouraging ADUs, often with streamlined permitting and relaxed parking requirements. However, local ordinances still apply, and there are variations between different California cities. Massachusetts has its own set of regulations to follow.
Is an ADU allowed in Maryland?
Accessory Dwelling Units are permitted in many parts of Maryland, but local zoning ordinances dictate specific requirements regarding size, setbacks, and owner occupancy. It's crucial to check the rules for the specific county or city you're interested in. Boston has its own distinct regulations.
What are the rules for ADU in California?
California's ADU laws, often updated, generally aim to simplify the process. They typically include limitations on impact fees and owner-occupancy requirements, and standardize setback rules. However, cities can still impose some local restrictions. For Boston, you'll need to adhere to Massachusetts and city-specific rules.
Also serving nearby: Quincy · Cambridge · Lynn · Newton · Brockton
More on this: HUD ADU resources — ADU policy and financing research.
Service area details
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, Charlestown, Dorchester, Jamaica Plain, South End — and every surrounding area.
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