ADU Pass
Franklin
ADU Pass helps homeowners in Franklin, Norfolk County, Massachusetts navigate the permit paperwork for building an accessory dwelling unit. This area covers 1 ZIP code.
Map
ADU details
ADU legality: allowed
Town of Franklin permits ADUs by right under Chapter 185 Section 185-19; consistent with MGL Ch 40A Sec 3. Owner-occupancy is required by Franklin's pre-existing bylaw text; the statewide preemption may render the owner-occupancy clause unenforceable for primary ADUs (verify with Town Counsel before relying on it).
Cost scenarios
| Scenario | Sq ft | Permit | Build | Total |
|---|---|---|---|---|
| minimum | 150 | $2,475 | $49,500 | $51,975 |
| 600 | 600 | $3,225 | $198,000 | $201,225 |
| midpoint | 825 | $3,787 | $272,250 | $276,037 |
| maximum | 900 | $3,955 | $297,000 | $300,955 |
Fee breakdown (as of 2026-04)
Permitting process
- Confirm zoning eligibility under Franklin Code Chapter 185 Section 185-19 (~5d)
Verify the parcel is in Franklin's R-1 (Residential), R-2, R-3, R-5, or R-6 single-family district per Chapter 185 Article V. Confirm the lot meets the dimensional minimums for the district (e.g. R-3 requires 40,000 sqft min lot, 200 ft frontage, 30 ft front / 20 ft side / 30 ft rear setbacks). ADU must comply with the most permissive of district setbacks, principal-dwelling setbacks, or accessory-structure setbacks per AHA preemption. - Optional pre-application meeting at 355 East Central Street (~7d)
Optional but strongly recommended pre-application meeting with the Franklin Building & Inspections Department on the 1st floor of the Municipal Building at 355 East Central Street. Hours are M/Tu/Th 8-4, Wed 8-6, Fri 8-1. Bring tax map and lot, sketch site plan, and intended GC. The Building Commissioner will identify which Franklin departments must sign off (Health if private septic in R-3/R-5, DPW if street-opening for sewer connection in R-1/R-2). - Submit ADU application via ViewPoint Cloud at franklinma.viewpointcloud.com (~1d)
Apply through Franklin's ViewPoint Cloud permit portal (NOT OpenGov; Franklin uses ViewPoint). Upload stamped architectural plans signed by a Massachusetts licensed architect or engineer (required if structural alterations), Section 185-19 compliance worksheet, plot plan from Massachusetts registered land surveyor, MA Stretch Code HERS rater certificate, structural details, MEP schematic, and Worker's Compensation affidavit per MGL Ch 152 Sec 25C(6). - Concurrent review (Building, Planning if site-plan triggered, Conservation, Health, Fire) (~35d)
Franklin Building Inspector reviews under 780 CMR 9th Edition (IRC 2021 with MA amendments) for code compliance and Section 185-19 dimensional compliance. If detached and over 500 sqft, Planning Department site-plan review under Section 185-31 applies. Franklin Conservation Commission reviews if work is within 100 ft of Mine Brook, Charles River headwaters, Beaver Pond, or Uncas Pond (Wetlands Protection Act Notice of Intent required). Health Agent reviews Title 5 septic capacity if R-3/R-5 parcel on private septic. Fire Department reviews under 527 CMR 1.00. - Pay Franklin permit fees and receive permit (~2d)
Pay $15 per $1000 of construction valuation (Franklin building permit fee schedule effective 2025-01-01) plus $1 per $1000 MA DPS Building Code Surcharge under MGL Ch 23B Sec 17 plus $200 site-plan review filing if applicable. Pay through ViewPoint Cloud portal. - Construction inspections through ViewPoint Cloud
Required inspections: footing/foundation, framing, rough electric/plumbing/gas (separate trade permits required - Franklin issues these separately), insulation/air-sealing, MA Stretch Code blower door at rough, final. Schedule each inspection 24 hours ahead through ViewPoint Cloud. Franklin inspections occur 8-4 Mon/Tue/Thu, with Wed evening availability. - Final inspection and Certificate of Occupancy (~5d)
Building Commissioner issues Certificate of Occupancy after all trade sign-offs (electrical, plumbing/gas), final HERS rating filed, and Health Agent septic sign-off (if applicable). Required before any tenant move-in.
Viability (permitted uses)
- Long-term rental: yes Long-term rental of an ADU is permitted under Section 185-19. AHA preemption likely renders the bylaw's owner-occupancy clause unenforceable for primary ADUs - verify with Town Counsel.
- Short-term rental: with-restrictions Franklin has not adopted a separate STR ordinance. State Operator Excise Tax (MGL Ch 64G) applies for rentals under 31 days. Must register with MA DOR.
- Office rental: with-restrictions Detached office rental requires home occupation permit under Section 185-26 or rezoning.
- Home office: yes Home occupation permitted under Section 185-26 with restrictions on signage and customer traffic.
- Studio / workshop: yes Personal artist studio is a permitted accessory use under Section 185-19 / 185-26.
- Agriculture: with-restrictions Franklin permits limited urban agriculture in R-3 and R-5 (rural-residential) districts. R-1 and R-2 prohibit livestock per Section 185 dimensional schedule.
- Relative support: yes Family-occupancy ADU explicitly permitted in single-family zones.
Contacts
Staff: Franklin Department of Planning & Community Development (Planning Director - Section 185-19 / Section 185-31 site-plan review), Franklin Conservation Commission (Wetlands Protection Act Notice of Intent (Mine Brook, Charles River headwaters)), Franklin Board of Health (Title 5 septic review (R-3 / R-5 parcels))
Utilities
- Water: Franklin Department of Public Works - Water Division (municipal) · 21d connect · $4,500
- Sewer: Franklin DPW Sewer Division (municipal collection, treats at Charles River Pollution Control District facility) · 21d connect · $5,500
- Electric: Eversource Energy Eastern MA (Franklin is in Eversource Eastern Massachusetts service territory) · 28d connect · $1,800
- Gas: Eversource Gas of Massachusetts (formerly Columbia Gas) · 35d connect · $1,500
Property values & taxes
Construction timeline
Realistic total: best 8mo · typical 12mo · worst 18mo
Modular pathway inspectors are occasional with modular
Financing
State ADU loans:
Insurance impact
HOA prevalence & preemption
Franklin has limited HOA penetration concentrated in newer subdivisions in R-2 / R-3 districts (post-2000 cluster developments). MA has no HOA-ADU preemption.
Regulatory overlays (3)
- wetland-overlay — Wetlands Protection Act 100-ft buffer around Mine Brook (Charles River headwaters), Beaver Pond, Uncas Pond, and DEP-mapped vernal pools · +30d · +6% cost
Franklin Conservation Commission requires Notice of Intent under MGL Ch 131 Sec 40 for any work within 100 ft of these resources. Mine Brook in particular crosses much of central Franklin. (map) - historic-district — Franklin Center Historic District (Town Common area) administered by Franklin Historical Commission · +30d · +4% cost
ADU on parcel within Franklin Center Historic District requires Certificate of Appropriateness review. Limited footprint - mostly the Town Common, Horace Mann monument area, and 19th-century brick buildings. (map) - other — Title 5 septic systems on R-3 and R-5 parcels west of I-495 (no municipal sewer) · +21d · +8% cost
Franklin's R-3 (rural-residential) and R-5 districts west of I-495 are largely unsewered. Adding an ADU bedroom triggers Title 5 capacity review under 310 CMR 15.00; system may need upgrade or replacement (typical $25K-$45K). (map)
Technical envelope (climate & building code)
Climate & energy code
Building code
Amendments:
- Amendment
- Amendment
- Amendment
Legal history (timeline)
Current ordinance: Town of Franklin Code Chapter 185 (Zoning) Article V Section 185-19 - Accessory Dwelling Units, adopted 2023-05-08, last amended 2025-01-22
- 2023-05-08 — Franklin Planning Board Public Hearing - Zoning Bylaw Amendment 23-894, 23-895R, 23-896 (town-council-hearing)
Planning Board held hearings on three companion amendments adding ADU definitions to Section 185-2, adding ADUs to the Use Regulation Schedule (Section 185-19), and adding ADU setback text to Section 185-19.
Effect: Initial ADU framework adopted into Chapter 185. - 2024-08-06 — Affordable Homes Act of 2024 (Ch 150 of the Acts of 2024) signed by Governor Healey (state-statute)
Statewide ADU as-of-right preemption added to MGL Ch 40A Sec 3.
Effect: Forced Franklin's pre-existing bylaw to be reconciled with state preemption. - 2025-01-22 — Franklin Zoning Bylaw Amendment 24-917 effective (town-council-amendment)
Town Council adopted Amendment 24-917 updating ADU definition and dimensional rules in Section 185-19 to comply with the Affordable Homes Act.
Effect: Franklin's ADU bylaw now reflects state by-right framework, but retains owner-occupancy language whose enforceability is contested. - 2025-02-02 — 760 CMR 71.00 (Affordable Homes Act ADU regulations) take effect (state-regulation)
Final EOHLC regulations implementing AHA ADU provisions take effect.
Effect: Franklin must process ADU applications consistent with 760 CMR 71.
Known issues (2)
- policy-review (since 2025-01-22) — Franklin's earlier 2023 ADU framework (Amendments 23-894/895R/896) included an owner-occupancy requirement. Amendment 24-917 (effective 2025-01-22) updated the definition section but retained the owner-occupancy clause - the AHA likely preempts that clause but no Franklin Town Counsel opinion has issued. Verify enforceability before structuring an investor ADU. (source)
- other (since long-standing) — Roughly half of Franklin's residential land area lies west of I-495 on private wells and Title 5 septic systems. ADU bedroom additions trigger 310 CMR 15.00 capacity review. Many older systems require upgrade or replacement before ADU permit can issue. (source)
Norfolk County — county ADU rules and overlays
County regulatory overlays
Norfolk 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 Norfolk 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
- 02038
Post Office
- 43 Main St, 02038