Accessory dwelling unit permit cost — Quincy, MA
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.
Frequently asked in Quincy
What's the process for getting an ADU permit in Quincy?
Are there affordable accessory dwelling unit options for Quincy residents?
What is a detached accessory dwelling unit, and can I build one?
How much does an ADU typically cost in Quincy?
What makes a good ADU company in Quincy?
Can I build a backyard accessory dwelling unit in Quincy?
What services does an ADU company provide in Quincy?
Also serving nearby: Boston · Cambridge · Newton · Brockton · Lynn
More on this: HUD ADU resources — ADU policy and financing research.
Service area details
Serving all of Quincy — population 101,597; about 6,130 residents per square mile across 16.6 sq mi. ZIP codes covered include 02169, 02170, 02171, 02269.
Neighborhoods served in Quincy: Wollaston, Germantown, North Quincy, South Quincy, Merrymount, Adams Shore — and every surrounding area.
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