Cost of 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.
About this service
Building an ADU involves several variables that shift the total investment. Your site conditions, the type of foundation, and the quality of finishes you choose will dictate whether you land on the lower or higher end of the spectrum. Because every lot is unique, we provide a breakdown of your specific project requirements to ensure full transparency. Exact pricing confirmed free on the call.
Frequently asked in Quincy
What makes an affordable ADU in Quincy?
What are detached accessory dwelling units like in Quincy?
What is the cost to build an accessory dwelling unit in Quincy?
How do I find ADU builders near me in Quincy?
What is an ADU permit in Quincy?
What are accessory dwelling unit contractors like in Quincy?
What are the rules for ADUs in Massachusetts?
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.
Areas we serve
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