Accessory dwelling unit — 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 are some options for homes with mother-in-law suites in Quincy?
What are the financing options for ADUs in Quincy?
How do I get an ADU estimate in Quincy?
What is the cost to build an accessory dwelling unit in Quincy?
Who is a good ADU builder in Quincy?
Are there any grants available for accessory dwelling units in Quincy?
Where can I find an accessory dwelling unit for rent 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, North Quincy, South Quincy, Germantown, Merrymount — and every surrounding area.
Areas we serve
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All of California · Costa Mesa · Jurupa Valley · Santa Maria