Modular 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
A modular unit is built in a factory and then transported to your property to be finished on a foundation. You should consider this if you want a faster construction timeline with less disruption to your daily life. It is an efficient way to add high-quality space to your lot.
Frequently asked in Quincy
What are the rules for ADU building in Quincy, MA?
How much does an accessory dwelling unit cost in Quincy?
Can I build an affordable ADU in Quincy?
What are the requirements for an accessory dwelling unit permit in Quincy?
What is the process for an ADU quote in Quincy?
Are there ADU builders who specialize in Quincy homes?
What are the advantages of a detached accessory dwelling unit?
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, Merrymount, North Quincy, South Quincy, Germantown — and every surrounding area.
Areas we serve
Browse by state, then city.
California (3)
All of California · Costa Mesa · Jurupa Valley · Santa Maria