Cost of accessory dwelling unit

Looking for cost of accessory dwelling unit in Worcester, MA? Call AccessoryDwellingUnit Services for a contact a provider — no obligation. Licensed adu builders serve Worcester and the surrounding area, and you'll get straight answers on timing and what affects the price.

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 Worcester

What are the disadvantages of ADUs in Worcester?

How much does an ADU cost in Massachusetts?

What are the rules for ADUs in Worcester?

Is an ADU allowed in my Worcester neighborhood?

ADUs are generally allowed in most residential districts in Worcester, but specific regulations may apply based on lot size and existing structures. Checking with the city's planning department or getting a consultation is recommended. A quick call to us can initiate that process for you.

What is the process for getting an ADU permit in Worcester?

Securing an ADU permit involves submitting detailed plans to the Worcester Planning Department for review. This typically includes architectural drawings, site plans, and proof of compliance with zoning codes. The experienced crews we collaborate with are adept at managing this application process.

Can I get advice on ADU financing 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

207,621residents

5,557per sq mile

8ZIP codes served

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: Institute Park, Indian Lake, Greendale, Shrewsbury Street, The Canal District, West Side — and every surrounding area.