Your authoritative source for accessory dwelling unit developments. We track every policy shift, financing option, and construction innovation so you can build smarter — not harder.
One year after the landmark law allowed ADUs by right statewide, 217 communities have approved 1,224 units from 1,639 total applications. New design challenge, incentive program, and MassHousing loans are next.
Only 550 ADUs were permitted in the first half of 2025 — less than a quarter of California's per-capita rate. The study calls for statewide setback standards, elimination of parking mandates, and allowing ADUs to be sold separately.
A 2024 law and 2025 assistance programs have spurred a flurry of ADU projects across the state. The new MHP program, backed by $10 million in state funding, is expected to further accelerate production.
MassHousing's new program offers subordinate mortgage loans up to $250K for detached units, targeting low-to-moderate-income homeowners. Applications expected to open in March with full program launch in spring 2026.
Greenfield officials welcome the state's $10M ADU Incentive Program and $20M loan fund, saying it will "move the needle" for homeowners who want to build but can't afford the upfront costs.
Governor Healey announces three new initiatives: a design contest with $60K in prizes, a $10M MHP support program, and MassHousing's reduced-rate ADU loan program for low-and middle-income homeowners.
Tracking the zoning changes, incentives, and land-use decisions shaping ADU construction across Massachusetts, Rhode Island, and beyond.
Since the Affordable Homes Act took effect Feb 2, 2025, ADUs up to 900 sq ft are now allowed by right in single-family zoning districts statewide. No special permit or owner-occupancy required. MHP's $10M Incentive Program launching spring 2026.
Rhode Island's 2024 ADU law allows by-right units on owner-occupied properties. 1-bed ADUs up to 900 sq ft, 2-bed up to 1,200 sq ft. RIHousing now offers FHA 203(k) refinance options specifically for ADU construction.
Despite statewide legalization, Massachusetts lags California by 4x in per-capita ADU permits. The study recommends eliminating parking mandates, statewide setback standards, and allowing separate ADU sales from principal dwellings.
