ADU Rules in Weymouth, MA
Yes. Weymouth allows ADUs by-right up to 900 sq ft under Article XXIX. The friction is not whether you can build. It is the site plan review, the public hearing required for every ADU, coastal flood rules, and two local provisions that may run up against state law.
Call BuildX: (781) 627-7000
Weymouth allows ADUs by-right
Town Council vote: unanimous · Article XXIX (Measure 24-119)The Weymouth Town Council unanimously adopted Article XXIX (Measure 24-119) on February 3, 2025 [Article XXIX], exactly one day after the state ADU law took effect on February 2, 2025 [760 CMR 71]. South Shore News documented the unanimous roll-call vote [South Shore News]. ADUs are permitted as-of-right anywhere single-family residential uses are allowed, up to 900 sq ft. The catch is procedural: Weymouth requires site plan review and design review with a public hearing for every ADU.
Can I build an ADU in Weymouth, MA?
Yes. Weymouth adopted Article XXIX on February 3, 2025, allowing ADUs by-right anywhere single-family residential uses are permitted, up to 900 sq ft. Every ADU goes through site plan review and design review with a public hearing, conducted by the Director of Planning and Community Development. No special permit is required.
Show full ordinance, citation, and the two provisions to verify
Weymouth's ADU framework lives in Chapter 120 Zoning, Article XXIX Accessory Dwelling Unit, adopted as Measure 24-119 by the Town Council on February 3, 2025 [Article XXIX]. ADUs are permitted as-of-right per MGL c. 40A ยง3 [MGL 40A] in any zoning district that allows single-family housing as-of-right or by special permit. The state floor is 900 sq ft, by-right in zones that allow single-family dwellings [760 CMR 71].
Two provisions to confirm before you design. Article XXIX contains two local rules that may run up against state law for protected-use ADUs:
- 750 sq ft cap on lots under 25,000 sq ft: The state floor allows up to 900 sq ft regardless of lot size [760 CMR 71]
- ADU must be the only residential dwelling unit on the lot before construction: The East Bridgewater Attorney General decision (April 14, 2025) struck down single-family-only limitations elsewhere [AGO Apr 2025]
We do not interpret state law for you. Confirm with the Weymouth Building Department at (781) 340-5004 how the town is currently applying the 750 sq ft cap and the only-residential-unit provision against 760 CMR 71.00 before you commit to a design. The site plan review process, the short-term-rental prohibition, and the no-condominium-conversion clause are all clearly within local authority and stand.
For most homeowners, the practical answer is straightforward: a Weymouth ADU at or under 900 sq ft, on a single-family lot, is a by-right project that does not need a special permit. What it does need is a clean site plan review and design review package, abutter notice, and your attendance at one public hearing.
Garage conversion ADU
A common variation of either the detached or attached ADU paths, depending on the garage configuration. Weymouth's Article XXIX does not treat garage conversion as a separate ADU category; it is classified based on whether the converted structure is structurally attached to the principal dwelling.
- If the garage is attached to the house: Treated as an attached ADU; still subject to site plan review and design review
- If the garage is detached from the house: Treated as a detached ADU; still subject to site plan review and design review
- Best for: Properties with a structurally sound existing garage; ability to reuse the foundation, walls, and roof; faster construction than ground-up
- Watch for: Foundation adequacy, insulation upgrades, separate-entrance and bathroom plumbing, and the interior-ADU cap of one-third the gross floor area of the existing structure under Article XXIX
Weymouth ADU Rules at a Glance
The six things most homeowners ask first. Tap "View all rule details" for the complete data set.
View all Weymouth rule details
- ADU types allowed: Detached, attached, interior conversion
- Allowed where: Anywhere single-family residential uses are allowed as-of-right or by special permit
- Town Council vote: Unanimous (Measure 24-119, February 3, 2025)
- General size cap: Lesser of one-half the size of the primary residence or 900 sq ft (local rule names 750 sq ft on lots under 25,000 sq ft; verify against state floor)
- Interior conversion cap: One-third the gross floor area of the existing dwelling
- Owner-occupancy: Not required for protected-use ADUs under state law; confirm Article XXIX posture with Planning
- Long-term rental: Allowed (short-term prohibited for both units)
- Sewer status: Substantial MWRA municipal sewer; outlying septic. Confirm by address
- MBTA stations in town: East Weymouth, Weymouth Landing, South Weymouth (Greenbush Line)
- Coastal flood zones: North Weymouth, Wessagusset Beach, Back River corridor
- Setbacks and lot coverage: Must conform to the dimensional requirements of the underlying district, excluding lot size. Confirm exact values with the Weymouth Planning Department
- Permit-granting authority: Inspector of Buildings (not the ZBA, not the Planning Board)
- Site plan review authority: Director of Planning and Community Development
- Ordinance citation: Chapter 120, Article XXIX (Measure 24-119)
Why BuildX Knows Weymouth ADUs
Weymouth is part of BuildX's South Shore home territory. We work Weymouth every month designing ADUs for your neighbors and know the site plan review process, the three MBTA stations, the MWRA sewer footprint, and the coastal flood constraints that drive your project.
Home Territory
Weymouth is part of BuildX's South Shore home territory. We are your neighbors, not a regional contractor. We work Weymouth every month, so we know the public hearing rhythm, the MBTA station parking exemptions, and the sewer-versus-septic line firsthand.
See One in Person
Walk through a real, finished BuildX ADU before you sign anything. Private showings are available by appointment.
Day 1 Property Review
Before quoting, we check zoning, sewer or septic, FEMA flood zone, wetlands, aquifer overlay, and MBTA station distance.
We Work Weymouth Every Month
Weymouth is part of BuildX's South Shore home territory. We work Weymouth every month designing ADUs for your neighbors. We bid Weymouth ADU projects regularly as part of our standard business operations. We don't have a Weymouth build on the board yet. Yours could be the first.
What we've built nearby: the Glauben ADU in Abington, which borders Weymouth to the south, and the Duggan and Pratt ADUs in Rockland, just down the line. And across the South Shore, BuildX has an active ADU pipeline in two dozen towns. The South Shore is home.
Real families. Real builds. Real ADUs on the South Shore. See more BuildX ADU builds →
What Can Complicate a Weymouth ADU?
Weymouth said yes to ADUs fast. The friction now is procedural and parcel-specific: the public hearing every ADU must clear, your flood-zone exposure on Hingham Bay, your sewer status, and the two local provisions that may not survive a state-law check. The factors that come up most often:
Why does every Weymouth ADU need a public hearing?
Affects you if: you are building any ADU in Weymouth. This requirement applies to every protected-use ADU, even though the use is by-right.
Weymouth's Article XXIX requires site plan review and design review with a public hearing for every by-right protected-use ADU [Article XXIX]. This is unusual. Most cities do not require a hearing for a by-right use. The hearing is procedural, not discretionary: it cannot deny a conforming ADU, but it adds steps you must get right.
Notice goes to abutters and abutters-to-abutters within 300 feet of your lot boundaries, no less than 7 days before the meeting. Site plan review happens within 30 days of a properly executed application, and a decision is rendered within 35 days of the first public hearing.
We prepare a clean site plan review and design review package, including the abutter notice, and we attend the public hearing on your behalf. The procedure is procedural, but it is a procedure that needs to be done right.
What flood-zone rules affect Weymouth ADUs?
Likely affects you if: your parcel is in North Weymouth, along Wessagusset Beach, or in the Back River corridor, or any coastal or tidal parcel mapped in a FEMA flood zone.
Weymouth has significant coastal exposure on Hingham Bay and the Back River. FEMA maps Coastal Zone V along Hingham Bay and Wessagusset Beach, and Zone A along the Back River and tidal areas [FEMA]. ADU projects on these parcels are different projects.
Cost premium: 15% to 25% on top of base ADU cost for elevation, breakaway walls, and engineer-stamped flood compliance.
Design requirements: FEMA-compliant elevation above base flood elevation, breakaway lower-level walls in V-zones, engineer-stamped structural design, flood-resistant materials, and utility elevation.
Check your specific parcel's flood zone on the FEMA Flood Map Service Center before committing to a detached design near the coast.
Do I need septic approval for a Weymouth ADU?
Likely affects you if: your parcel is in an outlying area not connected to the MWRA sewer system. Many central Weymouth neighborhoods are sewered, but not all.
Weymouth has substantial municipal sewer through the Massachusetts Water Resources Authority (MWRA) [MWRA]. Most central neighborhoods are sewered, and a sewered parcel bypasses Title 5 capacity issues entirely. That is a real cost advantage that most South Shore towns do not have. Confirm sewer status by your specific address.
Outlying septic-served parcels still require Title 5 review under 310 CMR 15.000 [Title 5]. Adding a bedroom adds wastewater design flow, so a Title 5 inspection and capacity check are typically required before the ADU permit is approved.
Cost impact (septic parcels only): $30,000 to $60,000 for a capacity check plus possible system replacement when an older system cannot carry an additional ADU bedroom. Weymouth participates in the WaterSmart South Shore SepticSmart program with NSRWA.
Do wetlands or conservation rules affect Weymouth ADUs?
Likely affects you if: your lot is near a coastal salt marsh, the Back River, Whitman's Pond, or any mapped wetland resource area or buffer zone.
Yes if your parcel falls within a wetland buffer. Weymouth has multiple coastal salt marshes, the Back River corridor, and Whitman's Pond. The Conservation Commission administers wetlands review under MGL c.131 ยง40, the state Wetlands Protection Act [Wetlands Act]. The Conservation Office is active and well-resourced at (781) 340-5007 (Town Hall, 3rd Floor).
Adding an ADU near a wetland resource area triggers a Notice of Intent or Request for Determination filing. Plan on adding time to the timeline if your parcel falls within the buffer.
Cost impact: +$5,000 to $15,000, plus roughly 6 to 10 weeks of additional review. Confirm the local buffer width with the Conservation Office for your specific parcel.
How does the Weir River Water System overlay affect ADUs?
Likely affects you if: your parcel falls within a Zone II wellhead protection area or the Weir River Water System recharge zone.
Weymouth, along with Hingham and Hull, is supplied by the Weir River Water System. Aquifer and wellhead protection overlays apply to portions of town [MassGIS]. A MassGIS overlay check on Day 1 tells you whether your parcel sits within a Zone II protection area, which can affect how a septic system is sited and sized on the outlying septic-served parcels.
On sewered parcels, the aquifer overlay rarely changes the project, since wastewater leaves the site through the MWRA system. We pull this layer before quoting either way.
Do Weymouth's MBTA stations affect ADU parking?
Likely affects you if: your parcel is within half a mile of East Weymouth, Weymouth Landing, or South Weymouth station. With three in-town stations, many Weymouth lots qualify.
This is Weymouth's biggest ADU advantage. The town has three MBTA commuter rail stations on the Greenbush Line: East Weymouth, Weymouth Landing, and South Weymouth [MBTA]. Properties within 0.5 miles of any of them may qualify for the state law parking exemption, meaning no additional off-street parking space is required for the ADU [760 CMR 71].
Many Weymouth lots fall inside one of those three half-mile rings, which makes Weymouth one of the most parking-friendly ADU markets on the South Shore. Verify your specific parcel's distance to the nearest station; we pull the transit-distance map on Day 1.
What Does a Weymouth ADU Cost?
A Weymouth ADU should not be priced from square footage alone. Two 800 sq ft ADUs can price very differently depending on flood elevation, sewer versus septic, conservation review, and the time the public hearing adds to the schedule.
That is the full span of our 14 floor plans. Prices include the complete building package, foundation through move-in-ready finishes. Site work is priced separately after a lot evaluation.
Weymouth-specific cost factors
See full ADU pricing and floor plans. For a Weymouth-specific quote, call (781) 627-7000. We will not quote a Weymouth ADU until we know your sewer or septic status, flood zone, and proximity to one of the three MBTA stations.
How the Weymouth ADU Permit Process Works
By-right, but procedural. Every ADU clears site plan review and a public hearing before the building permit issues.
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1
Parcel review
1 to 2 weeks
BuildX maps your parcel against zoning, sewer or septic, FEMA flood zone, wetlands, aquifer overlay, and distance to the three MBTA stations before quoting. This is the step that determines whether the rest of the timeline is straightforward or extended.
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2
Site plan review and design review package
Prepared before submission
We prepare detailed plans for both the Building Department and the Planning Department, plus the abutter notice that goes to abutters and abutters-to-abutters within 300 feet, no less than 7 days before the meeting. Article XXIX requires this for every ADU [Article XXIX].
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3
Public hearing and decision
Site plan review within 30 days of application; decision within 35 days of the first hearing
The Director of Planning and Community Development conducts the public hearing. The review is procedural for a conforming protected-use ADU; it cannot deny a by-right project, but the package and notice must be correct. We attend on your behalf.
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4
Building permit
After site plan review is complete
The Inspector of Buildings issues the building permit. Structural applications (new buildings, additions, demolition, solar) are submitted through Weymouth's online portal. Inspections are scheduled same-day by calling the inspector directly, see the Building Department card below.
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5
Overlay reviews (if triggered)
Add 6 to 10 weeks when triggered
Title 5 septic review for outlying parcels, Conservation Commission filing for wetland-buffer or coastal parcels under MGL c.131 ยง40, and FEMA flood compliance with engineer stamps for coastal parcels. These can run alongside the building permit but may extend the critical path.
Overall planning assumption: the site plan review and public hearing add roughly 30 to 65 days to a clean parcel beyond the building permit itself. Add 6 to 10 weeks more for any of the overlay reviews above.
After permits issue, construction inspections run through the Weymouth Building Department. Confirm current administrative posture at (781) 340-5004.
What Weymouth Zoning Districts Allow ADUs?
Weymouth uses traditional use-separation zoning (residential, commercial, industrial), not a form-based code. Article XXIX permits ADUs anywhere single-family residential uses are allowed, as-of-right or by special permit. The town's character is organized around several distinct villages, plus a separate redevelopment district at the former South Weymouth Naval Air Station. Exact dimensional schedules vary by district; confirm your parcel's setbacks and lot coverage with the Weymouth Planning Department.
Where ADUs are allowed
- Allowed in: Any district that permits single-family residential use as-of-right or by special permit, per Article XXIX [Article XXIX]
- ADU types: Detached, attached, and interior conversion
- Dimensional conformance: Must meet the maximum lot coverage and all other dimensional requirements of the underlying district, excluding lot size (state preempts the lot-size minimum)
- Setbacks, height, lot coverage: Confirm exact values with the Weymouth Planning Department for your district
Weymouth village geography
Weymouth is organized around several distinct villages, each with its own character. ADU design should match the neighborhood it sits in.
- East Weymouth: Residential village; East Weymouth MBTA station
- North Weymouth: Coastal residential; Hingham Bay exposure and FEMA Zone V; coastal premium applies
- South Weymouth: Former Naval Air Station; the SouthField / Union Point redevelopment district carries separate zoning rules; South Weymouth MBTA station
- Weymouth Landing: Urban village; Weymouth Landing MBTA station
SouthField / Union Point redevelopment district
The former South Weymouth Naval Air Station is now the SouthField / Union Point mixed-use redevelopment. Different zoning rules apply within this district than in base Weymouth zoning. If your parcel is inside SouthField / Union Point, confirm the applicable ADU rules directly with the Weymouth Planning Department before designing.
Source: Weymouth Code Chapter 120 Zoning and Article XXIX Accessory Dwelling Unit. Confirm exact dimensional values with the Weymouth Planning Department.
Sewer or Septic? Weymouth Leans Sewered.
This is a real cost advantage for many Weymouth ADUs. Weymouth has substantial municipal sewer through the MWRA. Most central neighborhoods are sewered, which bypasses Title 5 septic capacity issues entirely. Outlying parcels remain on private septic. Confirm your specific address before designing.
Show Title 5, water system, and aquifer details
- Sewer authority: Massachusetts Water Resources Authority (MWRA) [MWRA]
- Septic upgrade cost (outlying parcels): $30,000 to $60,000 typical
- Title 5 trigger: Adding a bedroom adds design flow, so Title 5 review is required on septic-served parcels [Title 5]
- Septic program: WaterSmart South Shore SepticSmart, with NSRWA partnership
- Water system: Weir River Water System; Zone II aquifer overlays in portions of town [MassGIS]
Most central Weymouth is sewered, which is a meaningful Title 5 advantage. We do not quote a Weymouth ADU until we confirm which side of the sewer line your parcel sits on. A quick check with the Building Department and the Health office answers it for your specific property.
Weymouth Is Several Villages in One
Weymouth is organized around distinct villages plus the SouthField redevelopment district. Each has its own sewer status, flood-risk profile, and design context. A North Weymouth coastal ADU is a different project from a South Weymouth ADU near the station.
Weymouth ADU Feasibility by Area (At a Glance)
| Weymouth Area | Common ADU Issue | BuildX Note |
|---|---|---|
| East Weymouth | Residential village, MBTA station proximity | Many parcels qualify for the East Weymouth station parking exemption |
| North Weymouth | Coastal flood exposure on Hingham Bay | FEMA Zone V; elevation and flood compliance can drive cost |
| South Weymouth | SouthField redevelopment district, separate zoning | Confirm SouthField rules with Planning; South Weymouth station nearby |
| Weymouth Landing | Urban village, tighter lots | Weymouth Landing station parking exemption helps tight lots |
| Wessagusset Beach | Coastal flood exposure, summer-resort character | FEMA Zone V; elevation and FEMA rules may affect design |
East Weymouth Transit
Residential village with the East Weymouth station on the Greenbush Line. Many parcels fall within the half-mile parking exemption ring.
Flood risk: Low to moderate, depending on proximity to the Back River.
North Weymouth High flood
Coastal residential on Hingham Bay. FEMA Coastal Zone V exposure. Engineer-stamped flood compliance required near the water.
Flood risk: High. Cost premium 15% to 25%.
South Weymouth Redevelopment Transit
Former Naval Air Station, now the SouthField / Union Point mixed-use redevelopment with separate zoning rules. South Weymouth station is on the Greenbush Line.
Flood risk: Low. Confirm SouthField district rules with Planning.
Weymouth Landing Transit
Urban village with the Weymouth Landing station. Tighter lots are common, where an interior conversion or attached ADU is often the cleaner fit. The station parking exemption helps.
Flood risk: Low to moderate.
Wessagusset Beach High flood
Coastal, summer-resort character on Hingham Bay. FEMA Coastal Zone V. Elevation and flood-resistant construction requirements apply.
Flood risk: High. Cost premium 15% to 25%.
What Weymouth's Town Council Said
When the ordinance passed unanimously and the committee chair put the by-right path on the record, the path is by-right.
the amendment allows for Accessory Dwelling Units, ADUs, to be permitted as of right anywhere single-family residential uses are allowed
The ordinance moved through the standard Town Council public hearing process and aligns Weymouth's local zoning with the Massachusetts Affordable Homes Act. If you meet the criteria (a single-family lot in a district that allows single-family use, 900 sq ft cap, the dimensional rules of your district), the ADU is by-right. The site plan review and public hearing are procedural steps along that by-right path, not a discretionary gate.
Weymouth Building Department
Department of Municipal Licenses and Inspections (DMLI)
- AddressWeymouth Town Hall, 75 Middle Street, 1st Floor East, Weymouth, MA 02189
- Phone(781) 340-5004
- DirectorJeffrey E. Richards, CBO (Certified Building Official) [DMLI]
- Administrative AssistantLisa VanWinkle, (781) 340-5004 or (781) 682-3611 [DMLI]
- Same-day inspection windowCall (781) 340-5004 between 7:30 AM and 9:00 AM. Inspectors leave at 9:00 AM for daily inspections. Plan accordingly.
- Online permittingStructural applications (new buildings, renovations, demolition, solar) submitted through the town online portal.
- Site plan reviewDirector of Planning and Community Development (separate from DMLI). Coordinate the public hearing here.
- Conservation Office(781) 340-5007 (Town Hall, 3rd Floor) for wetland questions.
- Department pageweymouth.ma.us DMLI
Weymouth runs an unusually disciplined same-day inspection window. Call between 7:30 AM and 9:00 AM to reach the inspector before they head out for the day. The Inspectional Services (Health) office is separate, at (781) 682-6112.
Questions to ask when you call Weymouth
- How is Weymouth currently applying the 750 sq ft cap on lots under 25,000 sq ft against the state 900 sq ft floor?
- How does the town handle the "only residential unit on the lot" provision after the East Bridgewater Attorney General decision?
- What is the typical timeline for the site plan review and public hearing (the 30-day and 35-day windows)?
- Is my parcel on MWRA sewer or private septic?
- Is my parcel within half a mile of East Weymouth, Weymouth Landing, or South Weymouth station for the parking exemption?
- Is my parcel in a coastal flood zone, a wetland buffer, or the SouthField redevelopment district?
Explore Weymouth ADU Topics
Jump to deep-dive sections on this page.
Weymouth ADU FAQs
Does Weymouth have an ADU bylaw?
Yes. The Weymouth Town Council unanimously adopted Article XXIX (Measure 24-119) on February 3, 2025, one day after the state ADU law took effect on February 2, 2025. ADUs are permitted by-right anywhere single-family residential uses are allowed, up to 900 sq ft. The ordinance amends Chapter 120 of the Weymouth Code.
Do I need a special permit for a Weymouth ADU?
No. A protected-use ADU is by-right. You do not need a special permit. What you do need is site plan review and design review with a public hearing, conducted by the Director of Planning and Community Development. That review is procedural; it cannot deny a conforming ADU, but it is required for every ADU.
Do I need a public hearing for a Weymouth ADU?
Yes. This is unusual for a by-right use, but Article XXIX requires site plan review and design review with a public hearing for every ADU. Notice goes to abutters and abutters-to-abutters within 300 feet of your lot, at least 7 days before the meeting. Site plan review happens within 30 days of a complete application, and a decision is issued within 35 days of the first hearing. BuildX prepares the package and attends on your behalf.
How big can a Weymouth ADU be?
State law allows up to 900 sq ft for a protected-use ADU, regardless of lot size. Weymouth's Article XXIX names a general cap of the lesser of one-half the size of the primary residence or 900 sq ft, and a local 750 sq ft cap on lots under 25,000 sq ft. The state floor allows 900 sq ft regardless of lot size, so confirm with the Weymouth Building Department how the town is applying its local lot-size cap before you design. Interior conversions are capped at one-third the gross floor area of the existing dwelling.
Is my Weymouth ADU on sewer or septic?
Most central Weymouth neighborhoods are on MWRA municipal sewer, which is a meaningful advantage because a sewered parcel bypasses the $30,000 to $60,000 Title 5 septic upgrade many South Shore towns face. Outlying parcels remain on private septic and require Title 5 review when an ADU adds a bedroom. Confirm sewer status by your specific address before designing.
Can I Airbnb my Weymouth ADU?
No. Weymouth's Article XXIX prohibits short-term rental for both the ADU and the principal single-family dwelling. This is stricter than most South Shore towns, which restrict only the ADU. If your business model is Airbnb or VRBO income from either unit, Weymouth is not your town. Long-term rentals are allowed.
Can I sell my Weymouth ADU as a condominium?
No. Article XXIX states the ADU may not be separately sold as a condominium, or otherwise. The ADU and the one-family dwelling must remain on the same lot and may not be divided into separate lots. Same lot, same ownership.
Do Weymouth's MBTA stations help with parking?
Yes, and this is Weymouth's biggest ADU advantage. The town has three Greenbush Line stations: East Weymouth, Weymouth Landing, and South Weymouth. A parcel within 0.5 miles of any of them may qualify for the state parking exemption, meaning no additional off-street parking space is required for the ADU. Many Weymouth lots fall inside one of those rings. Verify your parcel's distance to the nearest station.
Who do I call about building an ADU in Weymouth?
For official town process questions (permits, the site plan review and hearing, inspector scheduling, building code), call the Weymouth Department of Municipal Licenses and Inspections at (781) 340-5004, ideally between 7:30 AM and 9:00 AM to reach an inspector directly.
For parcel-level feasibility, cost estimates, design options, and construction planning, call BuildX at (781) 627-7000.
The two are different conversations. The town can tell you what is administratively required. BuildX can tell you what is realistic on your specific parcel and what it will actually cost to build.
Sources Reviewed
Last verified: September 20, 2026. Grouped by source type so you can see which claims come from town law, state law, town process, local constraints, and media records.
View all 22 sources, grouped
- Town of Weymouth. Article XXIX Accessory Dwelling Unit. Measure 24-119, passed unanimously by the Town Council February 3, 2025. Primary ADU ordinance source.
- Town of Weymouth. Weymouth Code Chapter 120 Zoning. Underlying zoning chapter that Article XXIX amends.
- Town of Weymouth. Weymouth Code Section 7-100 Building Construction. Building construction code, including Stretch Energy Code provisions.
- Commonwealth of Massachusetts. Accessory Dwelling Units (760 CMR 71.00). Protected-use ADU framework, effective February 2, 2025. Weymouth's Article XXIX was adopted one day later.
- MassDEP. Title 5 (310 CMR 15.000) Compliance for ADUs FAQ. Relevant for outlying septic-served parcels.
- Massachusetts General Laws. M.G.L. Chapter 40A, Section 3. Zoning Act as amended by the Affordable Homes Act (Chapter 150 of the Acts of 2024).
- Massachusetts General Laws. M.G.L. Chapter 131, Section 40 (Wetlands Protection Act). Governs Conservation Commission review of wetland buffers.
- Commonwealth of Massachusetts. Accessory Dwelling Unit (ADU) FAQs. References the East Bridgewater Attorney General decision (April 14, 2025), binding regional precedent that struck down single-family-only limitations.
- Town of Weymouth. Department of Municipal Licenses and Inspections (DMLI). Town Hall, 75 Middle Street, 1st Floor East. Phone (781) 340-5004. Director Jeffrey E. Richards, CBO; Administrative Assistant Lisa VanWinkle; same-day inspection window 7:30 AM to 9:00 AM.
- Town of Weymouth. Building Permit Information. Town permit information page.
- Town of Weymouth. DMLI Building Permit Information. Permit information detail and online portal for structural applications.
- Town of Weymouth. Local Building Inspector. Building Inspector landing page.
- Town of Weymouth. DMLI Resources. Department resources page.
- Town of Weymouth. Board of Licensing Commissioners, Licensing Process. Licensing process reference.
- Wikipedia and U.S. Census 2020. Weymouth, Massachusetts. Population approximately 58,000; one of the oldest towns in Massachusetts; coastal Hingham Bay geography; Town Council form of government.
- Census Reporter. Weymouth Town Profile. Demographics and Norfolk County designation.
- Norfolk County Registry of Deeds. Norfolk County Registry of Deeds (Dedham). Deed recording authority for Weymouth (Norfolk County, not Plymouth County).
- MBTA. Greenbush Line. Three Weymouth stations: East Weymouth, Weymouth Landing, South Weymouth.
- MassGIS, Bureau of Geographic Information. Aquifer and Zone II Wellhead Protection GIS layers. Zone II recharge zones and the Weir River Water System overlay serving Weymouth, Hingham, and Hull.
- Federal Emergency Management Agency (FEMA). National Flood Hazard Layer / Flood Map Service Center. Weymouth coastal flood zones: Zone V along Hingham Bay and Wessagusset Beach, Zone A along the Back River.
- Massachusetts Water Resources Authority (MWRA). MWRA sewer system coverage. Substantial municipal sewer coverage across Weymouth.
- South Shore News. Weymouth Town Council Approves Accessory Dwelling Unit Ordinance. February 3, 2025. Documents the unanimous roll-call vote and Town Councilor Kenneth DiFazio's quote on the by-right ADU framework.
Nearby South Shore ADU Rules
Weymouth borders Hingham to the east (sharing the Weir River Water System), Holbrook to the south (also in Norfolk County), Abington to the south, and Rockland to the south. All four are home territory for BuildX, the same neighborhoods we build in.
ADU Rules by City in the BuildX Service Area
BuildX serves 40 towns across four areas of southeastern Massachusetts. Each city has its own ADU bylaw, sewer or septic split, overlay map, and Building Department contact. Jump to the rules for your town:
South Shore (22)
South Coast (9)
Bridgewater Area (5)
Thinking about an ADU in Weymouth?
BuildX can review your Weymouth parcel for zoning, sewer or septic, FEMA flood zone, wetlands, aquifer overlay, and MBTA station distance before you spend money on design or permitting. Weymouth is BuildX home territory, so we know the site plan review process, the public hearing every ADU must clear, and the path through it.
See our ADU project portfolio or visit the ADU Home TourDisclaimer: The information on this page is drawn from live interviews, podcast episodes, municipal bylaws, planning board materials, town websites, and other publicly available sources, and reflects what was accurate as of the original recording or verification date. Pricing, timelines, materials, regulations, zoning rules, permit processes, fees, and overlay district boundaries can change -- sometimes without public notice -- and no two towns interpret or apply the rules the same way. This page is for informational purposes only and should not be relied upon as the basis for any purchasing, construction, or investment decision. BuildX makes no guarantee that the information is current or complete for your specific parcel. Before making any decisions, contact the town directly or call BuildX at (781) 627-7000 or schedule a Project Clarity Call to review your specific situation.