Accessory dwelling unit permit cost — Worcester, 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 Worcester

Also serving nearby: Newton · Lowell · Providence · Nashua · Cambridge

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More on this: HUD ADU resources — ADU policy and financing research.

Service area details

Serving all of Worcester — population 207,621; about 5,557 residents per square mile across 37.4 sq mi. ZIP codes covered include 01601, 01602, 01603, 01604, 01605, 01606, 01607, 01608.

Neighborhoods served in Worcester: Shrewsbury Street District, The Canal District, Main South, Greendale, Tatnuck — and every surrounding area.