1 county-level rule, plus city-specific rules for 1 city in Hampden County, Massachusetts.
Verified from official government sources
Hampden County has no county government and does not regulate ADUs. Under the Affordable Homes Act (Chapter 150 of the Acts of 2024) amending M.G.L. c. 40A §3, every Massachusetts municipality must allow at least one Accessory Dwelling Unit by-right on every single-family lot — including in Springfield, Holyoke, Chicopee, Westfield, and Agawam. Special permits cannot be required for the first ADU.
M.G.L. c. 40A, § 3
No zoning ordinance or by-law shall prohibit, unreasonably restrict or require a special permit or other discretionary zoning approval for the use of land or structures for a single accessory dwelling unit, or the rental thereof, in a single-family residential zoning district; provided, that the use of land or structures for such accessory dwelling unit under this paragraph may be subject to re...
1 cities in Hampden County have their own accessory structures rules. Each link goes to that city's dedicated page with code citations.
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