ADU Pass
Clinton
ADU Pass helps homeowners in Clinton, Worcester County, Massachusetts navigate the permit paperwork for building an accessory dwelling unit. This area covers 1 ZIP code.
Map
ADU details
ADU legality: allowed
Massachusetts preempts most local ADU restrictions. Clinton permits ADUs by right in single-family zones per its zoning ordinance.
Cost scenarios
| Scenario | Sq ft | Permit | Build | Total |
|---|---|---|---|---|
| minimum | 150 | $3,100 | $50,250 | $53,350 |
| 600 | 600 | $3,100 | $201,000 | $204,100 |
| midpoint | 675 | $3,100 | $226,125 | $229,225 |
| maximum | 1,200 | $3,100 | $402,000 | $405,100 |
Fee breakdown (as of 2026-04)
Permitting process
- Confirm parcel zoning at Clinton Building Department, 242 Church Street (~3d)
Verify the lot is in Clinton's R-15, R-30, or R-60 single-family district per the 2001 re-codified zoning bylaw. Building Commissioner Gary Smith holds office hours Monday-Friday 7:00 AM - 9:30 AM at 242 Church Street; permitting clerk Lourdes Gonzalez (formerly Dinorah Caraballo) handles intake. Clinton has no online zoning viewer; verification is in-person or by phone (978-365-4128). - Wachusett Reservoir Watershed Protection Act (WPA) determination (~35d)
Most of Clinton drains to the Wachusett Reservoir (MWRA's primary drinking-water source for metro Boston). MA Watershed Protection Act (MGL Ch. 92A 1/2) regulates land use within 200 ft of tributaries and 400 ft of the reservoir; ADUs in WPA buffer zones require MA Department of Conservation and Recreation (DCR) - Division of Water Supply Protection review, not just MassDEP WPA. Septic-system ADUs in the watershed face additional Title 5 nitrogen loading limits. - Clinton Sewer Department capacity confirmation (Wachusett-tributary I/I limits) (~21d)
Clinton operates under an EPA Consent Decree limiting sewer inflow/infiltration into the Nashua River system. New ADU sewer connections require Sewer Department capacity letter; gravity-flow connection only (no new pump stations). Septic alternative requires Title 5 inspection plus Worcester District 5 Health Office sign-off due to watershed sensitivity. - Submit Clinton Building Permit Application (paper, in-person at 242 Church Street) (~14d)
Clinton uses the paper Town of Clinton BUILDING PERMIT form (4-page document). Required: Workers' Comp affidavit (DIA Form 153), site plan stamped by MA-licensed Professional Land Surveyor showing watershed buffer compliance, architectural plans stamped by MA-licensed RA or PE, contractor's MA Construction Supervisor License (CSL) number, and homeowner authorization letter if not owner-applied. No online portal; in-person submission only. - Clinton Planning Board site plan review (if exceeds AHA dimensional caps) (~90d)
ADUs within state default (900 sqft, 50% of principal) are by-right and skip Planning Board. ADUs exceeding caps require Planning Board special permit hearing under Section 8 of the Clinton Zoning Bylaw; abutter notification 14 days; hearing within 65 days of complete filing. Town Counsel reviews at $250/hour for non-conforming requests. - Clinton Conservation Commission review (NOI under Wetlands Protection Act) (~35d)
Most Clinton residential lots are within 100 ft of a perennial stream draining to the Nashua/Wachusett system. Notice of Intent under MGL Ch. 131 s.40 required for any ground-disturbing ADU work. Order of Conditions issued within 21 days of public hearing. - Inspections by Clinton Building Department (Mon-Fri 9:30 AM - 12:00 PM) (~75d)
Inspections happen within fixed mid-morning window: footing/foundation, frame, MEP rough (Clinton has separate Wiring Inspector and Plumbing/Gas Inspector), insulation, fire-stopping, final. Smoke/CO certificate issued by Clinton Fire Department after final inspection passes. Inspector James Salmon (alternate) covers building inspections when Commissioner Smith is unavailable. - Certificate of Occupancy and Worcester County Registry of Deeds filing (~10d)
After all inspections pass and smoke/CO certificate issued, Building Commissioner signs Certificate of Occupancy. New ADU dwelling unit added to Clinton Assessors' card via the Town Treasurer's office (242 Church Street, same building). If ADU is being financed via MassHousing ADULP, recording at Worcester Registry District (Worcester) required to perfect the lien.
Viability (permitted uses)
- Long-term rental: yes Long-term rental of ADU explicitly permitted; Massachusetts owner-occupancy preemption (where applicable) makes ADU eligible for full landlord-tenant treatment.
- Short-term rental: with-restrictions STR rules vary by city. Clinton regulates STRs separately from ADU permitting; check local STR ordinance and HOA covenants.
- Office rental: with-restrictions Detached office rental requires home occupation permit or rezoning.
- Home office: yes Home occupation permitted with restrictions on signage and customer traffic.
- Studio / workshop: yes Personal artist studio is a permitted accessory use.
- Agriculture: with-restrictions Limited urban agriculture permitted in residential zones; livestock varies by district.
- Relative support: yes Family-occupancy ADU explicitly permitted in single-family zones.
Contacts
Staff: Gary Smith (Building Commissioner & Zoning Enforcement Officer (office hours Mon-Fri 7:00-9:30 AM)) gsmith@clintonma.gov, James Salmon (Alternate Building Inspector (back-up Building Commissioner)), Lourdes Gonzalez (Permitting Clerk - Clinton Building Department (intake, fee collection, inspection scheduling)) lgonzalez@clintonma.gov, Clinton Planning Board (Site plan / special permit review for ADUs exceeding AHA dimensional caps) planning@clintonma.gov, Clinton Conservation Commission (MA Wetlands Protection Act NOI filings; mandatory for most Clinton parcels (Nashua/Wachusett tributaries)) conservation@clintonma.gov, MA DCR - Division of Water Supply Protection (Wachusett Section) (Wachusett Reservoir Watershed Protection Act review for Clinton parcels in protected zones) DCR.WaterSupply@mass.gov, Clinton Fire Department (Smoke/CO certificate issuance after ADU final inspection)
Utilities
- Water: Clinton Water Utility · 21d connect · $4,500
- Sewer: Clinton Sewer / Wastewater · 21d connect · $5,500
- Electric: Clinton Electric Utility · 14d connect · $1,800
- Gas: Clinton Gas Utility · 21d connect · $1,500
Property values & taxes
Construction timeline
Realistic total: best 7mo · typical 11mo · worst 17mo
Modular pathway inspectors are occasional with modular
Financing
Insurance impact
HOA prevalence & preemption
Massachusetts has no HOA-ADU preemption; HOA covenants restricting ADUs are enforceable.
Technical envelope (climate & building code)
Climate & energy code
Building code
Amendments:
- Amendment
- Amendment
Legal history (timeline)
Current ordinance: Town of Clinton Zoning By-Law (Re-Codified June 18, 2001), as superseded for ADU by MGL Ch. 40A s.3 (AHA), adopted 2001-06-18, last amended 2025-02-02
- 2001-06-18 — Clinton Zoning By-Law re-codification (Town Meeting June 18, 2001) (town-meeting-vote)
Clinton's foundational zoning bylaw re-codified at Town Meeting; created Residential R-15, R-30, and R-60 districts with single-family-as-of-right and the current accessory-use schedule that ADU/in-law apartments are layered onto.
Effect: Established the dimensional baseline (R-15: 15,000 sqft min lot; R-30: 30,000 sqft min) governing ADU lots. - 2024-08-06 — MA Affordable Homes Act signed (Ch. 150 Acts of 2024) (state-law)
Statewide preemption: ADUs to 900 sqft as-of-right in single-family districts effective Feb 2, 2025. Clinton must conform local zoning bylaw or apply state default. Special-permit-only ADU rules in older Clinton bylaw versions are now overridden by state law.
Effect: Default state ADU rule applies in Clinton single-family districts pending bylaw conformance vote. - 2025-02-02 — Affordable Homes Act effective date for ADU statewide compliance (compliance-deadline)
MA EOHLC issued model bylaw template (Feb 2025); Clinton Planning Board has not yet warranted a town-meeting vote to amend Clinton zoning bylaw to specifically reference ADUs.
Effect: AHA self-executes; Clinton Building Department applies state rule directly.
Worcester County — county ADU rules and overlays
County regulatory overlays
Worcester County administers flood-hazard, and (where mapped) coastal, wildland-fire, historic, and airport overlays that shape ADU project feasibility. The most consistent overlay across the county is FEMA NFIP floodplain regulation; other overlays apply to specific geographies inside the county.
- FEMA NFIP Special Flood Hazard Areas in Worcester County — A new ADU in a mapped SFHA must be elevated to or above the Base Flood Elevation; cost impact on the project is often material.
- Coastal / hurricane wind exposure — Confirm design wind speed and exposure category at the building department.
- Historic districts and individually-listed historic resources
Massachusetts state — ADU law and programs
State ADU law
Massachusetts enacted statewide ADU preemption through the Affordable Homes Act of 2024 — Chapter 150 of the Acts of 2024 — signed by Governor Maura Healey on 2024-08-06. Sections 7 and 8 of the Act amended M.G.L. Chapter 40A (the Zoning Act) Sections 1A and 3, making ADUs a 'protected use' that must be allowed by-right in single-family zoning districts statewide. ADUs are capped at the smaller of 50% of the principal dwelling's gross floor area or 900 square feet. The amendment to Section 3 became effective 2025-02-02 (180 days after the Act's effective date). The implementing regulation, 760 CMR 71.00 (Protected Use Accessory Dwelling Units), was promulgated by the Executive Office of Housing and Livable Communities (EOHLC) and took effect 2025-01-31. Municipalities cannot prohibit ADUs or impose unreasonable regulatory requirements; they retain authority over site-plan review, bulk and height limits, setbacks, and short-term-rental bans. As of 2026-04, more than 1,200 ADUs had been approved statewide in the first year of implementation.
State financing programs
Massachusetts has launched one of the most aggressive ADU-specific state financing programs in the country. MassHousing's Accessory Dwelling Unit Loan Program (ADULP), announced 2026-01-14 by Governor Healey, provides second-mortgage construction financing of up to $250,000 for detached ADUs and up to $150,000 for attached ADUs. The product is structured as a 5.25% fixed-rate, 20-year amortizing loan, with a portion of additional funding offered at 0% interest with deferred repayment terms. Eligible homeowners must meet MassHousing's statutory income limits (up to 135% of Area Median Income — ranging from ~$165K to ~$205K depending on county). MassHousing initially authorized $20M for mission-oriented homeownership, with a portion supporting ADULP. The Massachusetts Housing Partnership administers a separate $10M ADU Technical Assistance Program for predevelopment activities. The Massachusetts Housing Partnership's One Mortgage program also includes an ADU Incentive Program component.
State housing programs
Massachusetts operates an integrated state-level ADU program suite combining preemption (760 CMR 71.00 + M.G.L. c. 40A), construction financing (MassHousing ADULP), technical assistance (MHP $10M program), and a no-cost ADU Design Challenge launching replicable plan templates. Governor Healey announced this campaign in 2026 alongside the 1,200+ ADU first-year approval milestone. The state does not yet operate a statewide impact-fee waiver, but municipalities cannot impose unreasonable regulatory requirements per the Act.
- Affordable Homes Act ADU Protected-Use Framework (760 CMR 71.00) — ADUs by-right in single-family districts statewide, capped at smaller of 50% of principal dwelling or 900 sqft. Implementing regulation defines model bylaw provisions and municipal-compliance requirements.
- MassHousing ADU Loan Program (ADULP) — 5.25% fixed-rate second mortgage up to $250K (detached) or $150K (attached), 20-year amortization, with a portion at 0% deferred. Launched 2026-01-14.
- MHP ADU Technical Assistance Program — $10M state-funded program administered by Massachusetts Housing Partnership for ADU predevelopment — site evaluation, design, permit preparation, contractor coordination.
- ADU Design Challenge — Healey administration program launching replicable, no-cost ADU design templates for use across Massachusetts municipalities.
Federal (United States) — ADU-relevant rules and programs
Federal ADU law
The United States has no federal statute that directly regulates accessory dwelling unit entitlement or design. Land-use authority over ADUs resides with states and local governments under the traditional police power. Federal engagement is limited to financing (Fannie/Freddie/FHA/VA/USDA), flood insurance (FEMA/NFIP), and discretionary housing programs (HUD), which are recorded in sibling sections of this file.
Federal financing programs
Federal housing-finance agencies and GSEs set nationwide underwriting rules that govern whether an ADU can be financed, appraised, and counted toward mortgage qualifying income. The relevant actors are Fannie Mae, Freddie Mac, FHA (HUD), VA, and USDA Rural Development.
Federal tax credits
There is no ADU-specific federal tax credit. ADUs may incidentally qualify for existing federal energy-efficiency and clean-energy tax credits when the ADU construction includes qualifying measures.
Federal housing programs
HUD administers several discretionary programs that can fund ADU-related activity at the grantee's election, but none is an ADU-specific program.
ZIP Code
- 01510
Post Office
- 320 High St, 01510