ADU Rules in Hanson, MA

Yes. Hanson allows ADUs by-right up to 900 sq ft. The friction is not zoning. It is Site Plan Review by the ZBA, Title 5 septic capacity, and the wetlands buffer. The bylaw has been reviewed and partially approved by the Massachusetts Attorney General's Office.

Reviewed by Buz Artiano · September 20, 2026 Bylaw adopted May 5, 2025 ATM AGO partial approval August 18, 2025 Hanson is BuildX home territory 10 sources reviewed Includes the AGO decision letter, Building Department contact, MBTA parking exemption, and how to see a finished BuildX ADU in person

Call BuildX: (781) 627-7000

Hanson allows ADUs by-right

Adopted May 5, 2025 ATM · Articles 19, 20, 22

Hanson Town Meeting adopted a new Accessory Dwelling Units section at the May 5, 2025 Annual Town Meeting through Articles 19, 20, and 22 [Bylaw §VI.B.1h]. On August 18, 2025, Massachusetts Attorney General Andrea Joy Campbell reviewed the bylaw and approved it, with specific provisions deleted [AGO Aug 2025]. Detached, attached, and interior-conversion ADUs are allowed by-right up to 900 sq ft per state law. Every ADU goes through Site Plan Review by the Zoning Board of Appeals, which is a procedural step, not a discretionary approval.

By-right AGO approved MBTA parking exemption Site Plan Review by ZBA

Can I build an ADU in Hanson, MA?

Yes. Hanson allows detached, attached, and interior-conversion ADUs by-right up to 900 sq ft, under amendments adopted at the May 5, 2025 Annual Town Meeting and approved by the Massachusetts Attorney General's Office on August 18, 2025. No special permit is required for the first ADU. Every ADU goes through Site Plan Review by the Zoning Board of Appeals, which is procedural and cannot deny a qualifying by-right ADU.

Show the bylaw history, AGO ruling, and state preemption note

Hanson's ADU rules were adopted at the May 5, 2025 Annual Town Meeting via Articles 19, 20, and 22, adding an Accessory Dwelling Units section to the Zoning Bylaws [Bylaw]. The amendments allow ADUs as of right in compliance with M.G.L. c. 40A §3 and 760 CMR 71.00 [MGL 40A] [760 CMR 71].

The Attorney General reviewed the bylaw. On August 18, 2025, Massachusetts Attorney General Andrea Joy Campbell issued a decision letter on the Hanson bylaw [AGO Aug 2025]. The AGO approved Articles 19 and 20 in full and partially approved Article 22, deleting the provision at §VI.B.1h(C)(13) that would have required a Special Permit for an ADU in some scenarios. The reason given was that requiring a Special Permit on a protected-use ADU conflicts with M.G.L. c. 40A §3 and 760 CMR 71.00.

The practical effect for a homeowner is unusual clarity. This bylaw has been reviewed and partially approved by the Attorney General's Office. The provisions that survived AGO review are enforceable. The provision the AGO struck down is not. When a buyer, lender, or appraiser asks whether your Hanson ADU is legal, you have a published state decision letter to point to.

What survived AGO review and is in force: all ADUs require Site Plan Review by the Zoning Board of Appeals (the ZBA may waive inapplicable or unreasonable Site Plan Review provisions); applicants must show adequate septic and well capacity under Title 5 and local Board of Health regulations; the local wetlands references in Article 3-13 of the Hanson General Bylaws apply; the ZBA may allow reasonable deviation through Site Plan Review for disability or limited-mobility accommodations; a second ADU on the same lot requires a Special Permit and a lot of at least 40,000 sq ft; and a pre-existing structure that is nonconforming to zoning still qualifies as a protected-use ADU if it otherwise meets the definition.

For most homeowners, the path is straightforward. A Hanson ADU at or under 900 sq ft on a single-family lot is a by-right project for the first unit. You do not need a Special Permit. You do go through Site Plan Review, and you do need to clear Title 5 septic capacity. Confirm how Hanson is currently administering the bylaw with the Building Department at (781) 293-5186 before you design.

Garage conversion ADU

A common variation of either the detached or attached ADU paths, depending on the garage configuration. Hanson's bylaw 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
  • If the garage is detached from the house: Treated as a detached ADU
  • Best for: Properties with a structurally sound existing garage; ability to reuse foundation, walls, and roof; faster permitting than ground-up construction
  • Watch for: Foundation adequacy, insulation upgrades, separate-entrance and bathroom plumbing additions, replacing the garage door with proper wall and window framing, and Title 5 septic capacity once a bedroom is added

Hanson ADU Rules at a Glance

The six things most homeowners ask first. Tap "View all rule details" for the complete data set.

ADUs Allowed Yes, by-right Articles 19, 20, 22, May 2025 ATM
Max Size 900 sq ft Protected use under state law
Permit Path Site Plan Review, then building By-right, but Site Plan Review by ZBA first
Special Permit Not for the first ADU Required for a second ADU on 40,000+ sq ft
Parking Exempt near MBTA Within 0.5 mi of Hanson Station, per state law
Biggest Cost Variable Septic, Title 5 $30,000 to $60,000 if upgrade needed
View all Hanson rule details
  • ADU types allowed: Detached, attached, interior conversion
  • Town Meeting: Adopted May 5, 2025 ATM (Articles 19, 20, 22)
  • AGO review: Partially approved August 18, 2025; §VI.B.1h(C)(13) Special Permit provision deleted [AGO Aug 2025]
  • Bylaw section: §VI.B.1h, Hanson Zoning Bylaws
  • Site Plan Review: Required by ZBA for all ADUs (procedural; adds 30 to 90 days)
  • Owner-occupancy: Not required under the AGO-approved bylaw
  • Short-term rental: Confirm with Building Department
  • Second ADU: Special Permit plus a lot of 40,000 sq ft or larger
  • Sewer status: Fully septic. No public sewer for residential properties
  • Aquifer overlay: Yes, on portions of town (municipal wells)
  • Wetlands buffer: Article 3-13 of the Hanson General Bylaws applies [Hanson Wetlands]
  • MBTA parking exemption: Within 0.5 mi of Hanson Station, per 760 CMR 71.03 [MBTA]
  • Setbacks and dimensional values: Confirm with the Hanson Planning Department
  • Max height: Confirm with the Hanson Planning Department
Why BuildX

Why BuildX Knows Hanson ADUs

Hanson is BuildX home territory. We work Hanson ADU projects and know the Site Plan Review, septic, wetlands, and MBTA parking-exemption constraints that drive your project.

Hanson Home Territory

Hanson is BuildX home territory. We are your neighbors, not a regional contractor. We build here, so we know Hanson ADU parcels, the Site Plan Review process, septic and Title 5 capacity, the wetlands buffer, and the MBTA parking-exemption boundary 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, septic capacity, the MBTA parking boundary, wetlands buffer, and aquifer overlay status.

BuildX in Hanson

Hanson is BuildX home territory. We are not a regional contractor visiting Hanson, we are your neighbors. BuildX is currently building one ADU project in Hanson:

  • Yeager (Under Construction): 900 GFA · 1-Bed, 1-Bath

Real families. Real builds. Real ADUs on the South Shore. See more BuildX ADU builds →

Not sure your septic can carry an ADU bedroom? Hanson is fully septic, so Title 5 capacity drives your ADU cost more than zoning does. Ask BuildX to check before you start designing.
Request Property Review

What Can Complicate a Hanson ADU?

The bylaw is not usually what slows a Hanson ADU down. Site Plan Review timing, septic capacity, and the wetlands buffer are. The factors that come up most often:

What is Site Plan Review for a Hanson ADU? Process

Affects you if: you are building any ADU in Hanson. Site Plan Review by the Zoning Board of Appeals is required for every ADU.

Hanson's by-right ADU still goes through Site Plan Review by the Zoning Board of Appeals [Bylaw]. This is procedural, not discretionary. The ZBA reviews the site plan, parking, drainage, lighting, screening, and setbacks, and the board may waive inapplicable or unreasonable Site Plan Review provisions. The ZBA cannot deny a qualifying by-right ADU.

Timeline impact: plan on 30 to 90 days for the hearing notice, public hearing, and decision. By-right does not mean instant in Hanson. Build this step into your schedule from the start.

This is the single most common surprise for Hanson homeowners. "By-right" still means a public hearing in front of the ZBA. We have helped clients through it and we know the questions the board asks.

Do I need septic approval for a Hanson ADU? Septic

Affects you if: your parcel is anywhere in Hanson. Hanson has no public sewer for residential properties, so every ADU is a Title 5 conversation.

Yes. Hanson is fully on private septic, with no municipal sewer for residential properties. Adding an ADU adds a bedroom, which adds wastewater design flow, so a Title 5 inspection and capacity check are required before the ADU permit is approved [Title 5]. Older three-bedroom systems often cannot carry an additional bedroom without an upgrade.

Cost impact: $30,000 to $60,000 typical for a Title 5 capacity check plus possible system replacement when an older system cannot carry the additional ADU bedroom.

Get the Title 5 inspection done as Step 1, usually before you even apply for Site Plan Review. It answers the gating cost question for your specific property.

Does the Hanson MBTA station affect ADU parking? Parking exemption

Likely affects you if: your parcel is in central Hanson within 0.5 miles of Hanson Station. A substantial portion of central Hanson may qualify. Verify your parcel's distance.

Hanson is one of the few South Shore towns with an in-town MBTA commuter rail station. Hanson Station sits on the Old Colony / Kingston-Plymouth Line, with service to South Station, Boston [MBTA]. Under state law (760 CMR 71.03), no additional parking can be required for an ADU within 0.5 miles of a transit station. That is a permanent code rule, not a courtesy.

We pull a transit-distance map on Day 1 of any Hanson ADU project, because the parking exemption is that material to project economics. If your lot is within the boundary, you do not need to add a parking space for the ADU.

Can I build a second ADU on the same Hanson lot? Density tier

Likely affects you if: your lot is 40,000 sq ft (about 0.92 acre) or larger. Most Hanson lots will not qualify.

Hanson allows a second ADU on the same lot, but only on lots of 40,000 sq ft or larger, and the second unit requires a Special Permit from the Board of Appeals [Bylaw]. State law allows local restrictions on a second ADU even though it cannot restrict the first.

This is unusual. Most South Shore towns allow only one ADU per single-family lot. If your lot is large enough, the second-ADU path is a meaningful design option worth exploring early.

Do wetlands or conservation rules affect Hanson ADUs? Wetlands

Likely affects you if: your parcel is near Burrage Pond, Wampatuck Pond, or any wetland resource area or its buffer.

Hanson has a local Wetlands Protection bylaw at Article 3-13 of the Hanson General Bylaws, which supplements the state Wetlands Protection Act (MGL c.131 §40) [Hanson Wetlands]. The Hanson Conservation Commission reviews projects in or near resource areas. Adding an ADU near a wetland triggers a Notice of Intent or Request for Determination filing.

Cost impact: +$5,000 to $15,000, plus 6 to 10 weeks of Conservation Commission review when triggered.

Hanson's notable natural features include Burrage Pond Wildlife Management Area, Wampatuck Pond, and the Bay Circuit Trail. Parcels near these features get a careful resource-area review.

How does the Hanson aquifer overlay affect ADUs? Aquifer

Likely affects you if: your parcel falls within an aquifer protection overlay. Portions of Hanson sit over the regional groundwater system.

Hanson has municipal wells and is part of the regional groundwater system that feeds Brockton's Silver Lake watershed and other supplies. Aquifer protection overlays apply to portions of town and influence how septic systems are sited for ADUs.

Because Hanson is fully septic and partly over the aquifer, septic siting near an aquifer overlay is reviewed carefully. We pull the overlay layers on Day 1 to see whether your parcel falls inside one before quoting.

What Does a Hanson ADU Cost?

A Hanson ADU should not be priced from square footage alone. Two 800 sq ft ADUs can price very differently depending on septic capacity, wetlands review, the Site Plan Review timeline, and site access.

BuildX ADU Pricing $284,301 to $525,861

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.

Hanson-specific cost premium factors

Septic upgrade (no public sewer) +$30,000 to $60,000 when an older system cannot carry the added bedroom
Site Plan Review (ZBA hearing) +30 to 90 days for the hearing process, generally no fee impact
Wetlands buffer (Article 3-13) +$5,000 to $15,000, plus 6 to 10 weeks of Conservation Commission review when triggered
Site access and utility run Variable impact. Backyard access, trenching distance for water and electric, equipment staging, and utility routing can change cost meaningfully even when the ADU footprint stays the same. We map this on the Day 1 property review.

See full ADU pricing and floor plans. For a Hanson-specific quote, call (781) 627-7000. We will not quote a Hanson ADU until we know your septic status, the Site Plan Review scope, your wetlands buffer status, and your distance from the MBTA parking boundary.

How the Hanson ADU Permit Process Works

Two steps, both by-right. Site Plan Review by the ZBA comes first, then the building permit.

Site Plan Review is procedural, not a special permit. Hanson requires Site Plan Review by the Zoning Board of Appeals for every ADU. The board reviews the site plan, parking, drainage, and lighting, but it cannot deny a qualifying by-right ADU. Plan on 30 to 90 days for the hearing process and build it into your timeline from the start.
  1. 1

    Parcel review

    1 to 2 weeks

    BuildX maps your parcel against zoning, septic capacity, the MBTA parking-exemption boundary, the wetlands buffer, and the aquifer overlay before quoting. This is the step that determines whether the rest of the timeline is straightforward or extended.

  2. 2

    Site Plan Review (ZBA)

    Typically 30 to 90 days for the hearing process

    All ADUs require Site Plan Review by the Zoning Board of Appeals [Bylaw]. The ZBA reviews the site plan, parking, drainage, lighting, screening, and setbacks, and may waive inapplicable or unreasonable provisions. This is procedural. The board cannot deny a by-right ADU that meets the criteria.

  3. 3

    Building permit

    30 to 60 days after Site Plan Review approval

    After Site Plan Review approval, file the building permit with the Hanson Building Department. Title 5 septic and Conservation Commission filings for the wetlands buffer are addressed at this stage.

  4. 4

    Septic and wetlands reviews (if triggered)

    Add review time when triggered

    Title 5 septic review (MassDEP 310 CMR 15.000) is in play on every Hanson parcel because the town is fully septic. A Hanson Conservation Commission filing under Article 3-13 and MGL c.131 §40 applies if your parcel is in a wetland buffer. These can extend the critical path.

Overall planning assumption: 90 to 150 days from contract signing to construction start, combining the Site Plan Review hearing process (30 to 90 days) with the building permit (30 to 60 days). Add time for Title 5 and any Conservation Commission filing.

After permits issue, construction inspections run through the Hanson Building Department. Confirm current administrative posture at (781) 293-5186.

What Hanson Zoning Districts Allow ADUs?

ADUs are allowed by-right in Hanson's residential districts under the bylaw adopted at the May 2025 ATM. Site Plan Review by the ZBA applies to all ADUs in every district, which is the unifying procedural rule. The district dimensional schedules in the AGO-approved bylaw text should be confirmed parcel by parcel with the Planning Department.

Single-Family Residence districts

ADU rules: Detached, attached, and interior-conversion ADUs are allowed by-right up to 900 sq ft in Hanson's single-family residential districts, subject to Site Plan Review by the ZBA [Bylaw].

  • Min lot: Confirm with the Hanson Planning Department
  • Min frontage: Confirm with the Hanson Planning Department
  • Max coverage: Confirm with the Hanson Planning Department
  • Max height: Confirm with the Hanson Planning Department

What this means for your ADU: the ADU allowance is by-right, but the dimensional details (lot size, frontage, coverage, height, setbacks) come from the district schedule in the post-AGO bylaw text. We confirm those parcel by parcel with the Planning Department before design rather than assuming a value.

Overlay districts. Aquifer and wetlands.

Aquifer protection overlays apply to portions of Hanson because the town relies on municipal wells over the regional groundwater system. The local wetlands bylaw (Article 3-13 of the Hanson General Bylaws) adds Conservation Commission jurisdiction near resource areas [Hanson Wetlands]. Overlays modify, but do not prevent, ADU construction.

Overlay analysis happens on Day 1. We pull your parcel's overlays before quoting.

Second ADU on large lots

Hanson allows a second ADU on the same lot via Special Permit, but only on lots of 40,000 sq ft (about 0.92 acre) or larger [Bylaw]. State law allows a local restriction on a second ADU even though it cannot restrict the first. Most Hanson lots will not qualify, but if yours does, this is a meaningful design option.

Source: Hanson Zoning Bylaws, as amended through the May 5, 2025 ATM and approved by the AGO on August 18, 2025. Confirm exact dimensional values with the Hanson Planning Department.

Sewer or Septic? Hanson Is Fully Septic.

This is the single biggest cost variable in any Hanson ADU project. Hanson has no public sewer for residential properties, so ADU parcels are served by private septic and Title 5 capacity is the gating question. Confirm your parcel's septic setup before design.

Town-wide residential Private septic
Public sewer None for residential properties
Water Hanson Water Department (municipal wells)
Show Title 5, water utility, and aquifer details
  • Water utility: Hanson Water Department, drawing on municipal wells
  • Septic upgrade cost: $30,000 to $60,000 typical for older 3-bedroom systems adding an ADU bedroom
  • Title 5 trigger: Adding a bedroom adds design flow, so a Title 5 inspection is required on every Hanson parcel [Title 5]
  • Aquifer: Portions of Hanson sit over the regional groundwater system feeding Brockton's Silver Lake watershed

Because Hanson is fully septic, we do not quote a Hanson ADU until we know your existing system's Title 5 capacity. A Title 5 inspection answers this for your specific property and is usually Step 1, before you even apply for Site Plan Review.

Hanson Neighborhoods and ADU Context

Hanson is a compact town, but a few areas come up often in ADU conversations. The distance to Hanson Station matters because of the parking exemption, and proximity to the major ponds matters because of the wetlands buffer.

Hanson Center Septic MBTA close

The town center runs along Liberty Street, near Town Hall, the government complex, and Hanson Station. Parcels here are most likely to fall within the 0.5-mile MBTA parking exemption.

Flood risk: Low. Septic town-wide.

Brentwood Septic

The northeastern region of Hanson, around Brook Street, State Street, and Gorwin Drive. Distance to the MBTA parking boundary varies by parcel.

Flood risk: Low. Septic.

Burrage Pond and Wampatuck Pond area Septic Wetlands

Conservation-adjacent residential near Hanson's major water features. Parcels here are more likely to trigger the Article 3-13 wetlands buffer and a Conservation Commission filing.

Flood risk: Some floodplain near the water features.

Bonney Hill Septic

Site of the former Plymouth County Hospital, a tuberculosis sanatorium that operated from 1919 to 1992 and was demolished in 2017. Residential parcels, septic, with distance to the MBTA boundary varying by location.

Flood risk: Low.

Hanson is BuildX home territory. We work Hanson ADU projects and know the Site Plan Review process, the septic constraints, the wetlands buffer, and the MBTA parking exemption. Ask us anything about your specific parcel.
Ask BuildX about your Hanson lot

What the Attorney General's Office Says About Hanson's Bylaw

Most towns rely on a town counsel opinion. Hanson has something stronger: a published decision from the Massachusetts Attorney General's Office reviewing the bylaw itself.

On August 18, 2025, Massachusetts Attorney General Andrea Joy Campbell issued a decision letter on Hanson's ADU bylaw [AGO Aug 2025]. The AGO approved Articles 19 and 20 in full and partially approved Article 22, deleting the provision at §VI.B.1h(C)(13) that would have required a Special Permit for an ADU in some scenarios. The published reasoning was that imposing a Special Permit requirement on a protected-use ADU conflicts with M.G.L. c. 40A §3 and 760 CMR 71.00.

This is binding state legal review, not a local opinion. The provisions that survived AGO review are enforceable. The provision the AGO struck down is not. For a Hanson homeowner, that means unusual certainty: when a buyer, lender, or appraiser asks whether your ADU is legal, you can point to a published Attorney General decision letter on the exact bylaw. Confirm the current administrative posture and any provisions specific to your project with the Hanson Building Department at (781) 293-5186.

Hanson Building Department

Hanson Building Department

Tuesday hours run later, to 6:00 PM, which is the best evening window for a live conversation. The Hanson ADU bylaw and the AGO-approved text are hosted on the town site through the Building Department and Planning Board pages.

Questions to ask when you call Hanson
  1. Is my parcel in a residential district where ADUs are allowed by-right?
  2. What is the current Site Plan Review timeline for an ADU before the ZBA?
  3. Is my parcel within 0.5 miles of Hanson Station for the parking exemption?
  4. What does Title 5 review require for my existing septic system?
  5. Is my parcel in a wetland buffer under Article 3-13?
  6. Does the AGO-approved bylaw text address short-term rentals?

Explore Hanson ADU Topics

Jump to deep-dive sections on this page.

Hanson ADU FAQs

Can I build a detached ADU in Hanson?

Yes, by-right. Hanson Town Meeting adopted the ADU bylaw at the May 5, 2025 Annual Town Meeting through Articles 19, 20, and 22, and the Massachusetts Attorney General's Office approved it on August 18, 2025. Detached, attached, and interior-conversion ADUs are all permitted by-right up to 900 square feet, subject to Site Plan Review by the Zoning Board of Appeals.

Do I need a special permit for a Hanson ADU?

No, not for the first ADU. The first ADU is by-right up to 900 sq ft. The Attorney General's Office specifically deleted a bylaw provision that would have required a Special Permit for an ADU in some scenarios, holding that it conflicts with state law. A second ADU on the same lot is different: it requires a Special Permit and a lot of at least 40,000 sq ft.

What is Site Plan Review and how long does it take?

Site Plan Review is a required procedural review by the Zoning Board of Appeals for every Hanson ADU. It is not a special permit. The board reviews the site plan, parking, drainage, lighting, screening, and setbacks, and can waive inapplicable or unreasonable provisions, but it cannot deny a qualifying by-right ADU. Plan on 30 to 90 days for the hearing notice, public hearing, and decision.

Will I need an extra parking space?

It depends on your distance from Hanson Station. Under state law (760 CMR 71.03), no additional parking can be required for an ADU within 0.5 miles of a transit station. A substantial portion of central Hanson may fall within that boundary. Verify your parcel's distance; we pull a transit-distance map on Day 1 of any Hanson ADU project.

Can I build an ADU on septic in Hanson?

You will be building on septic, because Hanson has no public sewer for residential properties. The existing septic system must have capacity under Title 5 (310 CMR 15.000) to handle the additional bedroom that an ADU typically adds. Adding a bedroom adds wastewater design flow, and Title 5 calculates whether the system can carry it. If your existing system lacks capacity, an upgrade or full replacement adds $30,000 to $60,000 or more to the project. The first thing BuildX does on a Hanson property is assess Title 5 capacity before any design work begins.

How big can a Hanson ADU be?

Up to 900 square feet as a protected-use ADU under state law (760 CMR 71.00). That is the by-right cap. Hanson's bylaw allows the first ADU at this size by-right, subject to Site Plan Review.

What does a Hanson ADU cost?

BuildX ADU pricing ranges from $284,301 to $525,861. That covers the complete building package, foundation through move-in-ready finishes; site work is priced separately after a lot evaluation. Hanson-specific drivers move a project within that band: because the town is fully septic, a Title 5 upgrade can add $30,000 to $60,000; a wetlands buffer filing under Article 3-13 can add $5,000 to $15,000; and Site Plan Review adds 30 to 90 days to the timeline. For a property-specific quote, call (781) 627-7000.

Who do I call about building an ADU in Hanson?

For official town process questions (permits, Site Plan Review scheduling, fees, inspector availability, building code interpretation), call the Hanson Building Department at (781) 293-5186.

For parcel-level feasibility, cost estimates, septic capacity, 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, and local constraints.

View all 10 sources, grouped
Town law
  1. Town of Hanson. Hanson Zoning Bylaws. Includes the Accessory Dwelling Units section §VI.B.1h adopted via Articles 19, 20, 22 of the May 5, 2025 ATM. Governs ADU rules, Site Plan Review by the ZBA, and the second-ADU density tier.
  2. Town of Hanson. Hanson General Bylaws. Includes Article 3-13 Wetlands Protection (local wetlands bylaw supplementing the state Wetlands Protection Act).
State law
  1. Commonwealth of Massachusetts. Accessory Dwelling Units (760 CMR 71.00). Effective January 31, 2025. Protected-use ADU definition and the transit parking exemption (760 CMR 71.03).
  2. Massachusetts General Laws. M.G.L. Chapter 40A, Section 3. As amended by Chapter 150 of the Acts of 2024 (the Affordable Homes Act); ADU provisions.
  3. MassDEP. Title 5 (310 CMR 15.000) Compliance for ADUs FAQ. Highly relevant since Hanson is fully septic with no public sewer.
Town process
  1. Town of Hanson. Hanson Building Department. Contact, hours, and permit information.
  2. Massachusetts Attorney General Andrea Joy Campbell. AGO Decision Letter on Hanson ADU Bylaw. August 18, 2025. Partial approval of the May 2025 ATM bylaw §VI.B.1h; specific disapproval of §VI.B.1h(C)(13) (Special Permit requirement). Binding state legal review.
Local constraints
  1. MBTA. Old Colony / Kingston-Plymouth Line. Hanson Station, with service to South Station, Boston. Drives the 0.5-mile transit parking exemption for ADUs.
  2. U.S. Census 2020. Hanson, Massachusetts. Population, area, geography, and town history (incorporated 1820).
  3. Census Reporter. Hanson Town Profile. Demographics and household composition.

Nearby South Shore ADU Rules

Hanson borders Rockland and Hanover to the north, Pembroke to the east, and Halifax to the south. Hanson's commuter rail station is significant enough that neighboring Hanover is required to adopt MBTA Communities multifamily overlay zoning because of it. 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:

Ready for a parcel-specific answer? A free Project Clarity Call gets you a one-pager covering zoning, septic capacity, the MBTA parking boundary, wetlands buffer, and aquifer overlay status for your specific Hanson address.
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Thinking about an ADU in Hanson?

BuildX can review your Hanson parcel for zoning, septic capacity, the MBTA parking exemption, wetlands buffer, and aquifer overlay status before you spend money on design or permitting. Hanson is BuildX home territory, so we know the Site Plan Review process and the septic constraints that drive your project.

See our ADU project portfolio or visit the ADU Home Tour

Disclaimer: 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.