Adu estimate — 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
An estimate is a preliminary assessment of what your ADU project might cost before the final design is locked in. It helps you decide if your budget aligns with the size of the unit you want. Costs vary based on whether you choose a detached structure or a garage conversion. It is a starting point for planning. Exact pricing confirmed free on the call.
Frequently asked in Quincy
What are homes with in-law suites like in Quincy?
Homes with in-law suites in Quincy are essentially homes that have an attached or detached accessory dwelling unit (ADU). These suites offer independent living quarters, perfect for extended family members. They can be designed to blend seamlessly with the main house or stand alone. Licensed builders can create beautiful and functional in-law suites.
Are ADUs allowed in Massachusetts?
How much does an ADU cost in Quincy?
What are the options for modular ADUs in Quincy?
Can I get a 24-hour ADU service in Quincy?
What is an ADU unit in Quincy?
An ADU unit in Quincy is a secondary, independent living space on a single-family home lot. This could be a detached backyard cottage, a basement apartment, or a unit above a garage. It's essentially a smaller, complete home within or attached to a larger one. We help you find the pros to build one.
Who are the best accessory dwelling unit contractors 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, Germantown, Merrymount, Adams Shore — and every surrounding area.
Areas we serve
Browse by state, then city.
California (3)
All of California · Costa Mesa · Jurupa Valley · Santa Maria