ADU Rules in Rockland, MA

By , CEO and Master Builder, BuildX

Yes. Rockland allows ADUs by-right up to 900 sq ft. Rockland published its ADU By-law 2025 to align local rules with state law. The friction is not zoning. It is septic capacity, the Hingham Street Reservoir watershed, and the Permit Eyes online process.

Reviewed by Buz Artiano · September 20, 2026 ADU By-law 2025 published BuildX Home Territory 22 sources reviewed Includes the published 2025 bylaw, Building Department contact, Permit Eyes links, and how to see a finished BuildX ADU in person

Call BuildX: (781) 627-7000

Rockland allows ADUs by-right

Published ADU By-law 2025 · Aligned with state law (760 CMR 71.00)

Rockland published its ADU By-law 2025 [ADU Bylaw 2025], a named, dated local regulation that aligns with Massachusetts state law (760 CMR 71.00) [760 CMR 71]. That puts the local rules and the state framework on the same page, which is not the case in every South Shore town. Protected-use ADUs of 900 sq ft or less, attached, detached, or interior, are processed by-right with a building permit through the Permit Eyes online portal.

By-right Published 2025 bylaw No special permit Mostly septic

Can I build an ADU in Rockland, MA?

Yes. Rockland allows attached, detached, and interior-conversion ADUs by-right in single-family residential zones, up to 900 sq ft or 50% of the principal dwelling, whichever is smaller. Rockland published its ADU By-law 2025 to align with state law. No special permit is required for protected-use ADUs that meet the criteria.

Show the published 2025 bylaw and state law alignment

Rockland is one of the few South Shore towns that responded to the Massachusetts Affordable Homes Act by publishing a named, dated local ADU regulation rather than leaving an older bylaw to conflict with state law. The town's ADU By-law 2025 [ADU Bylaw 2025] is the controlling local document.

Rockland published the ADU By-law 2025, formally updating local rules to align with state law. The published document is the town's primary ADU source. Town of Rockland, ADU By-law 2025 (published document). Confirm the current adopted text, the Town Meeting adoption date, and Attorney General approval status with the Building Department before you design.

State law sets the by-right floor. Under 760 CMR 71.00 (effective February 2, 2025) [760 CMR 71] and MGL Chapter 40A Section 3 as amended by the Affordable Homes Act [MGL 40A], a protected-use ADU up to 900 sq ft is permitted by-right in zones that allow single-family dwellings, subject to the building code and septic capacity. Rockland's 2025 bylaw is consistent with that framework.

Confirm two items with the Rockland Building Department at (781) 871-1874 ext. 1191 before you commit: whether the ADU By-law 2025 has been Attorney General approved and is in force as written, and how Rockland is processing protected-use ADU applications under the bylaw in practice. The 900 sq ft cap and the by-right path are clear; the administrative details are worth a direct call.

Garage conversion ADU

A common variation of either the detached or attached ADU paths, depending on the garage configuration. Rockland processes the ADU based on whether the converted structure is structurally attached to the principal dwelling, not as a separate category.

  • If the garage is attached to the house: Treated as an attached ADU under the building permit path
  • If the garage is detached from the house: Treated as a detached ADU; the Article V accessory-structure rules apply
  • Best for: Properties with a structurally sound existing garage; ability to reuse foundation, walls, and roof; faster than ground-up construction
  • Watch for: Foundation adequacy, insulation upgrades, separate-entrance and bathroom plumbing, septic design flow if the lot is on private septic, and off-street parking under Section 415-35

Rockland 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 ADU By-law 2025 published
Max Size 900 sq ft Or 50% of principal home
Permit Path Building permit Via Permit Eyes online portal
Special Permit Not required For protected-use ADUs
Sewer Status Mostly septic Title 5 capacity is gating
Biggest Cost Variable Septic and watershed $30,000 to $60,000 if upgrade needed
View all Rockland rule details
  • ADU types allowed: Detached, attached, interior conversion
  • Local bylaw: ADU By-law 2025 (published) [ADU Bylaw 2025]
  • State framework: 760 CMR 71.00, effective February 2, 2025 [760 CMR 71]
  • Max size: 900 sq ft or 50% of principal dwelling, whichever is smaller
  • Owner-occupancy: Not required for protected-use ADUs under state law. Confirm against the 2025 bylaw text
  • Long-term rental: Allowed for protected-use ADUs
  • Short-term rental: Confirm STR policy in the 2025 bylaw with the Building Department
  • Sewer status: Mostly septic; some commercial areas sewered
  • Watershed overlay: Hingham Street Reservoir Watershed Protection District; stricter use limits and heightened septic review apply [A/R JWW] [WPD Bylaw]
  • Aquifer overlay: Multiple Zone II wellhead protection zones [MassGIS]
  • Flood zones: Riverine Zone A along French Stream and Beaver Brook [FEMA]
  • Accessory structure height: 24 ft, with abutter setback conditions per Article V [Article V]
  • Parking: Off-street parking required per Section 415-35 [Article V]
  • Permitting platform: Permit Eyes, Patriot Properties (online) [Permit Eyes]
  • Conversions pathway: Under § 415-22F, single-family to two-family is by-right with a Building Inspector site plan; three-family needs a ZBA Special Permit (650 sq ft per unit minimum) [Article V]

Confirm exact dimensional values for your zoning district with the Rockland Building Department at (781) 871-1874 ext. 1191. The cited Article V accessory-structure rules above are the verified figures.

Why BuildX

Why BuildX Knows Rockland ADUs

Rockland is BuildX home territory. We are your neighbors, not a regional contractor. We build here, so we know the septic constraints, the Hingham Street Reservoir watershed, the Permit Eyes process, and the no-Friday Building Department schedule that drive your project.

Rockland Home Territory

Rockland is BuildX home territory. We are your neighbors, not a regional contractor. We build here, so we know Rockland ADU parcels, the watershed protection district, sewer or septic status, and the Permit Eyes workflow 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, the Hingham Street Reservoir watershed, FEMA flood zone, wetlands, and aquifer overlay status.

BuildX in Rockland

Rockland is BuildX home territory. We are not a regional contractor visiting Rockland, we are your neighbors. The list below carries each project's current status:

  • Duggan (Under Construction): 900 GFA · 1-Bed, 1-Bath
  • Pratt (Pre-Construction): 650 GFA · 1-Bed, 1-Bath

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

Not sure if your parcel is in the watershed or on septic? Septic capacity and the Hingham Street Reservoir watershed drive Rockland ADU cost more than zoning does. Ask BuildX to check before you start designing.
Request Property Review

What Can Complicate a Rockland ADU?

Rockland's published 2025 bylaw gives the zoning clarity. Your parcel's septic and overlays, not the bylaw, are usually what move project cost and timeline. The factors that come up most often:

Do I need septic approval for a Rockland ADU? Septic

Likely affects you if: your parcel is anywhere outside the limited commercial areas that have municipal sewer. Rockland is largely septic-dependent.

Most likely yes. Rockland is mostly on private septic, with some commercial areas sewered [Sewer Dept]. Adding an ADU bedroom adds wastewater design flow, so a Title 5 inspection and capacity check through the Board of Health [Board of Health] are typically required before the ADU permit is approved [Title 5]. Reserve-area documentation is also part of the Title 5 review.

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

Rockland participates in the WaterSmart South Shore SepticSmart program with the North and South Rivers Watershed Association [WaterSmart]. Title 5 capacity is the first thing we check on a Rockland septic property before any design work begins.

How does the Hingham Street Reservoir watershed affect Rockland ADUs? Watershed overlay

Likely affects you if: your parcel falls within the Abington/Rockland Joint Water Works watershed protection district. Significant portions of Rockland are inside it.

Significant portions of Rockland fall within the Abington/Rockland Joint Water Works watershed protection district, which draws from the Hingham Street Reservoir, the Myers Avenue Wells, and Great Sandy Bottom Pond in Pembroke [A/R JWW]. The Watershed Protection District bylaw prohibits high-risk uses and requires a ZBA special permit for any on-site disposal of process wastes, and septic on these parcels gets heightened Title 5 review [WPD Bylaw].

That overlay matters for an ADU. Adding a bedroom adds design flow, and the Title 5 capacity calculation gets extra scrutiny inside the protection district, not just the standard Title 5 baseline. Some lots will need additional engineering.

We pull the watershed map on Day 1 for any Rockland property, because whether your lot is inside or outside the protection district changes the septic math.

What flood-zone rules affect Rockland ADUs? Riverine

Likely affects you if: your parcel is along the French Stream or Beaver Brook corridors.

Rockland is inland, so it has no coastal flood exposure. The flood risk is riverine: FEMA Zone A runs along the French Stream and Beaver Brook corridors [FEMA]. ADU projects on parcels in those zones need flood-compliant design and engineer-stamped flood compliance.

Rockland has a dedicated Flood Administrator on staff in the Building Department [Flood Admin]. Rockland keeps this as a dedicated role rather than folding it into the Building Inspector position. If any part of your lot is in a FEMA flood zone, we schedule a coordination call with the Flood Administrator early. Direct contact saves weeks.

How does the Rockland aquifer overlay affect ADUs? Aquifer

Likely affects you if: your parcel falls within one of Rockland's Zone II wellhead protection areas.

Rockland has multiple Zone II well aquifer recharge zones protecting the town's water supply [MassGIS]. ADU septic siting near a wellhead is reviewed more carefully here than in towns without that overlay. Adding a bedroom adds design flow, and Zone II overlays limit how septic systems can be sited and sized.

A MassGIS overlay check on Day 1 tells you whether your parcel sits within a Zone II area. We pull this before quoting, alongside the watershed protection district map.

Do wetlands or conservation rules affect Rockland ADUs? Conservation

Likely affects you if: your lot is near French Stream, Beaver Brook, or any other wetland resource area.

French Stream and Beaver Brook run through Rockland, and Conservation Commission filings are frequent for projects near those resource areas. Rockland administers wetlands review under its local Wetlands Bylaw (Chapter 407) [ConsCom] plus the state Wetlands Protection Act, MGL Chapter 131 Section 40 [Wetlands Act].

Adding an ADU near a wetland resource area triggers a Notice of Intent or Request for Determination filing with the Conservation Commission. Plan on adding time to the timeline if your parcel falls within a buffer zone.

Cost impact: +$5,000 to $15,000, plus 6 to 10 weeks of additional review.

Does Rockland have a transit parking exemption? Parking

Rockland does not have a commuter rail station within town limits, so the MBTA transit-adjacent parking exemption does not apply here the way it does in towns with an in-town station. The closest stations are Holbrook/Randolph on the Middleborough/Lakeville and Fall River/New Bedford Lines, and Hanson Station on the Old Colony Line [MBTA].

Rockland's ADU parking follows the off-street parking requirement under Section 415-35 of the zoning bylaw [Article V]. Confirm Rockland's current MBTA Communities Act compliance status and any parking treatment with the Building Department, since that can change how parking is reviewed for your parcel.

What Does a Rockland ADU Cost?

A Rockland ADU should not be priced from square footage alone. Two 800 sq ft ADUs can price very differently depending on septic capacity, watershed protection district status, conservation review, 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.

Rockland-specific cost premium factors

Septic upgrade (mostly septic, reserve area required) +$30,000 to $60,000 most likely
Hingham Street Reservoir watershed (if applicable) Heightened Title 5 review and possible additional engineering on Watershed Protection District lots
Conservation Commission filing (French Stream, Beaver Brook, wetlands) +$5,000 to $15,000, plus 6 to 10 weeks of additional review
FEMA riverine flood zone (if applicable) Coordinate with the dedicated Flood Administrator; engineer-stamped flood compliance
Site access and utility run Variable impact. Backyard access, trenching distance for water, electric, and gas, equipment staging, and the Permit Eyes registration step can change cost and schedule 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 Rockland-specific quote, call (781) 627-7000. We will not quote a Rockland ADU until we know your sewer or septic status, watershed protection district status, flood zone, and overlay status.

How the Rockland ADU Permit Process Works

A by-right building permit through the Permit Eyes online portal, plus overlay reviews where your parcel triggers them.

Plan around the Permit Eyes registration step and the Building Department schedule. Rockland submits Building permits through Permit Eyes, which requires a homeowner account. The Building Department is closed Fridays and runs no inspections on Fridays, so build the schedule around the Monday-to-Thursday window and the extended Tuesday evenings.
  1. 1

    Parcel review

    1 to 2 weeks

    BuildX maps your parcel against zoning, sewer or septic, the Hingham Street Reservoir watershed protection district, FEMA flood zone, wetlands, and Zone II aquifer overlay before quoting. This is the step that determines whether the rest of the timeline is straightforward or extended. MassGIS and watershed overlay checks happen on Day 1.

  2. 2

    Permit Eyes registration and submission

    Account setup, then submission

    Register an account on the Rockland Online Town Services portal, which runs Permit Eyes (the Patriot Properties platform) [Permit Eyes]. Homeowners can submit Building and Electrical permits directly; Plumbing and Gas permits require licensed tradespersons. Submit, track, pay, and communicate all in-app.

  3. 3

    Building permit review

    Confirm current turnaround with the Building Department

    The Building Department reviews the protected-use ADU application against the ADU By-law 2025 and state law. For a by-right ADU that meets the criteria, no special permit is required. Confirm the typical Permit Eyes turnaround for an ADU when you call.

  4. 4

    Overlay reviews (if triggered)

    Add time when triggered

    Title 5 septic review and reserve-area documentation (MassDEP 310 CMR 15.000), heightened Title 5 review for Watershed Protection District lots, a Conservation Commission filing for wetlands near French Stream or Beaver Brook (MGL Chapter 131 Section 40 plus the local Wetlands Bylaw, Chapter 407), and Flood Administrator coordination plus engineer stamps for FEMA flood-zone parcels. These can extend the critical path.

Overall planning assumption: Plan on a clean by-right ADU moving efficiently once Permit Eyes is set up. Add time for any of the overlay reviews above, especially Title 5 and the watershed cap calculation.

After permits issue, construction inspections run through the Rockland Building Department. Note: no inspections are scheduled on Fridays. Confirm current administrative posture at (781) 871-1874 ext. 1191.

What Rockland Zoning Allows for ADUs

Rockland uses traditional use-separation zoning. Protected-use ADUs are allowed by-right in single-family residential zones under the ADU By-law 2025 and state law. The verified accessory-structure rules below come from Article V of the Rockland Zoning Bylaw.

Article V accessory structure rules Verified
  • Accessory structure height: No accessory structure shall exceed 24 ft
  • Height exception condition: Unless located at least 15 ft from any point on any dwelling on an abutting lot
  • Lot line setback: In no event within 15 ft of any side or rear lot line
  • Off-street parking: Required per Section 415-35

These rules were amended at the May 2, 2011 Annual Town Meeting (Article 39) and the May 4, 2015 Annual Town Meeting (Article 53) [Article V]. Confirm whether the 24-ft accessory-structure height limit applies to your specific ADU configuration with the Building Department, since the ADU By-law 2025 governs protected-use ADUs directly.

Single-family residential zones

Protected-use ADUs of 900 sq ft or less are allowed by-right in zones that permit single-family dwellings, under the ADU By-law 2025 [ADU Bylaw 2025] and state law (760 CMR 71.00) [760 CMR 71].

Confirm exact dimensional values for your zoning district, including minimum lot size, frontage, and setbacks, with the Rockland Building Department at (781) 871-1874 ext. 1191. If your parcel is in a district variant, confirm with the Building Department how Rockland is applying the bylaw and 760 CMR 71.00 to that district.

Conversions Bylaw, a separate pathway

Rockland is housing-flexible. In addition to the ADU bylaw, Rockland's zoning (§ 415-22F) allows converting a single-family dwelling to a two-family by-right with a site plan to the Building Inspector, and to a three-family by ZBA Special Permit, with a minimum of 650 sq ft per unit [Article V].

This is a different pathway from the ADU bylaw, but it signals the town's housing orientation. If your goal is bigger than a single ADU, the conversions pathway is available. We can advise on which pathway fits your goals.

Overlay districts. Watershed, aquifer, wetlands, flood.

The Hingham Street Reservoir watershed protection district, multiple Zone II wellhead protection areas, the local Wetlands Bylaw with the state Wetlands Protection Act, and FEMA riverine flood zones along French Stream and Beaver Brook all overlay the base zoning. Overlays modify, but do not prevent, ADU construction.

Overlay analysis happens on Day 1 with MassGIS layers and the watershed map. We pull your parcel's overlays before quoting.

Source: Rockland Zoning Bylaw Article V and the published ADU By-law 2025.

Sewer or Septic? Rockland Is Mostly Septic.

This is the single biggest cost variable in any Rockland ADU project. Rockland is largely septic-dependent. Some commercial areas are sewered, but most residential properties are on private septic, and the Hingham Street Reservoir watershed protection district adds a strict cap on top of standard Title 5.

Most residential parcels Private septic
Some commercial areas Sewered
Hingham Street Reservoir watershed Watershed Protection District
Show Title 5, watershed, and aquifer details
  • Water supply: Abington/Rockland Joint Water Works (Hingham Street Reservoir, Myers Avenue Wells, Great Sandy Bottom Pond) [A/R JWW]
  • Septic upgrade cost: $30,000 to $60,000 most likely
  • Title 5 trigger: Adding a bedroom adds design flow, so Title 5 inspection and reserve-area documentation required on septic parcels [Title 5]
  • Watershed overlay: Hingham Street Reservoir Watershed Protection District; stricter use limits and heightened septic review [A/R JWW] [WPD Bylaw]
  • Aquifer: Multiple Zone II wellhead protection zones [MassGIS]
  • Program: WaterSmart South Shore SepticSmart (with NSRWA) [WaterSmart]

Most of Rockland is on septic. We do not quote a Rockland ADU until we know whether your parcel is on septic and whether it sits inside the Hingham Street Reservoir watershed protection district. A Title 5 inspection plus the watershed cap calculation answers the capacity question for your specific property.

Rockland Building Department

Rockland Building Department

  • AddressRockland Town Hall, 242 Union Street, Rockland, MA 02370
  • Phone(781) 871-1874 ext. 1191
  • Fax(781) 616-6824
  • Hours
    Monday8:30 AM to Noon, 1:00 to 4:30 PM
    Tuesday8:30 AM to Noon, 1:00 to 4:30 PM
    1st and 3rd TuesdayExtended to 8:00 PM
    Wednesday8:30 AM to Noon, 1:00 to 4:30 PM
    Thursday8:30 AM to Noon, 1:00 to 4:30 PM
    FridayClosed
  • Five separate rolesCode Enforcement Officer, Building Inspector, Zoning Officer, Flood Administrator, and Building Safety Inspector are kept as separate coordinated roles [Building Dept] [Staff Directory].
  • Online permittingPermit Eyes, the Patriot Properties platform, via Rockland Online Town Services [Permit Eyes].
  • Building Departmentrockland-ma.gov/159/Building
  • Online Town Servicesrockland-ma.gov/483/Online-Town-Services

Rockland keeps five separate coordinated roles in the Building Department, with clear specialization across them. If your project has flood-zone exposure, you will work with the dedicated Flood Administrator. Note the unusual schedule: the department is closed Fridays, with no Friday inspections, but the 1st and 3rd Tuesday extend to 8:00 PM, which is useful for working homeowners.

Call Rockland Building Dept Ask BuildX to check first
Questions to ask when you call Rockland
  1. Has the ADU By-law 2025 been Attorney General approved and is it in force as written?
  2. How is Rockland processing protected-use ADU applications under the 2025 bylaw?
  3. Is my parcel on septic, and is it inside the Hingham Street Reservoir watershed protection district?
  4. Is my parcel in the Watershed Protection District, and what septic limits apply to my ADU bedroom addition?
  5. Will Title 5 review and reserve-area documentation be required?
  6. Is my parcel in a FEMA flood zone, and should I coordinate with the Flood Administrator?
  7. What is the typical Permit Eyes turnaround for an ADU, and how do I register an account?
Rockland is BuildX home territory. We work Rockland ADU projects and know the septic constraints, the watershed protection district, the Permit Eyes process, and the no-Friday Building Department schedule. Ask us anything about your specific parcel.
Ask BuildX about your Rockland lot

Explore Rockland ADU Topics

Jump to deep-dive sections on this page.

Rockland ADU Zoning→ Permit Process→ Rockland ADU Costs→ Size Limits→ All Rule Details→ Parking Rules→ Septic and Title 5→ Hingham St Reservoir Watershed→ Flood Zones→ Wetlands and Conservation→ Aquifer Overlay→ Sewer or Septic→ Garage Conversions in Rockland→

Rockland ADU FAQs

Does Rockland have an ADU bylaw?

Yes. Rockland published its ADU By-law 2025, formally updating local rules to align with Massachusetts state law (760 CMR 71.00). Rockland is one of the few South Shore towns with a named, published post-state-law ADU bylaw rather than an older bylaw left to conflict with state law. Protected-use ADUs of 900 sq ft or less are allowed by-right in single-family residential zones.

Do I need a special permit for a Rockland ADU?

No, for a protected-use ADU that meets the criteria. Under the ADU By-law 2025 and state law, a protected-use ADU up to 900 sq ft is processed by-right with a building permit through the Permit Eyes online portal. Confirm with the Building Department that the 2025 bylaw aligns with state law as you expect for your specific parcel.

How big can a Rockland ADU be?

Up to 900 square feet, or up to 50% of the principal home's gross floor area, whichever is smaller. This is the same cap as state by-right protection under 760 CMR 71.00, and Rockland's 2025 bylaw aligns with that framework.

Sewer or septic in Rockland?

Mostly septic. Some commercial areas are sewered, but most residential properties in Rockland are on private septic. This is the single biggest cost variable. A Title 5 capacity check plus possible system replacement adds $30,000 to $60,000 to a septic-served Rockland ADU project. If your parcel is in the Hingham Street Reservoir Watershed Protection District, stricter use limits and heightened Title 5 review apply on top of standard Title 5.

What is the Hingham Street Reservoir watershed?

Rockland gets its water through the Abington/Rockland Joint Water Works, which draws from the Hingham Street Reservoir, the Myers Avenue Wells, and Great Sandy Bottom Pond in Pembroke. Significant portions of Rockland fall within the Watershed Protection District, where the bylaw limits high-risk uses and septic gets heightened Title 5 review. If your parcel is inside the protection district, adding an ADU bedroom requires a careful Title 5 capacity calculation. We pull the watershed map on Day 1.

What is Permit Eyes?

Permit Eyes is Rockland's online permitting system, built on the Patriot Properties platform. You register an account through Rockland Online Town Services, then submit, track, pay, and communicate all in-app. Homeowners can submit Building and Electrical permits directly; Plumbing and Gas permits require licensed tradespersons. Plan for the registration step early.

What about Friday hours at the Building Department?

The Rockland Building Department is closed Fridays, including during the summer, and runs no inspections on Fridays. Standard hours are Monday through Thursday, 8:30 AM to Noon and 1:00 to 4:30 PM. The 1st and 3rd Tuesday of each month extend to 8:00 PM, which is useful for working homeowners. Build your schedule around the no-Friday window.

What does a Rockland 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. Rockland-specific drivers move a project within that band: a septic upgrade adds $30,000 to $60,000, a Conservation Commission filing adds $5,000 to $15,000 and 6 to 10 weeks, and parcels in the Hingham Street Reservoir Watershed Protection District can require heightened Title 5 review and additional engineering. For a property-specific quote, call (781) 627-7000.

Who do I call about building an ADU in Rockland?

For official town process questions (permits, fees, inspector availability, Permit Eyes account help, building code interpretation), call the Rockland Building Department at (781) 871-1874 ext. 1191.

For parcel-level feasibility, cost estimates, design options, watershed and septic considerations, 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 22 sources, grouped
Town law
  1. Town of Rockland. ADU By-law 2025. Rockland's published post-state-law ADU bylaw. Primary ADU source.
  2. Town of Rockland. Zoning Bylaw Article V (Building, Lot and General District Regulations). Accessory structure 24-ft height limit with abutter setback conditions, off-street parking per Section 415-35, and the § 415-22F conversion provisions. Amended 5-2-2011 ATM Art. 39 and 5-4-2015 ATM Art. 53.
  3. Town of Rockland. Zoning Bylaw (Chapter 415, Art. IV), Watershed Protection District. WPD prohibits landfills, junkyards, road-salt stockpiles, hazardous-waste manufacture/storage, solid-waste disposal, and land mining; ZBA special permit required for fuel storage and on-site process-waste disposal.
State law
  1. Commonwealth of Massachusetts. Accessory Dwelling Units (760 CMR 71.00). Effective February 2, 2025. The state framework Rockland's 2025 bylaw aligns with.
  2. Massachusetts General Laws. M.G.L. Chapter 40A, Section 3. Zoning Act as amended by Chapter 150 of the Acts of 2024 (Affordable Homes Act).
  3. MassDEP. Title 5 (310 CMR 15.000) Compliance for ADUs FAQ. Highly relevant; Rockland is mostly septic.
  4. Massachusetts General Laws. M.G.L. Chapter 131, Section 40. Wetlands Protection Act.
Town process
  1. Town of Rockland. Building Department. 242 Union Street; (781) 871-1874 ext. 1191; five separate coordinated roles (Code Enforcement Officer, Building Inspector, Zoning Officer, Flood Administrator, Building Safety Inspector); limited-hours and Friday-closed schedule.
  2. Town of Rockland. Online Town Services / Permit Eyes. Patriot Properties platform; submit, track, pay, and communicate in-app.
  3. Town of Rockland. Building Department staff directory.
  4. Town of Rockland. Conservation Commission. Administers the local Wetlands Protection Bylaw (Chapter 407) and the state Wetlands Protection Act; filings for resource-area projects.
  5. Town of Rockland. Board of Health / Public Health Department. Title 5 septic reviews.
  6. Town of Rockland. Sewer Department. Town sewer infrastructure; most of Rockland is on private septic with some commercial areas sewered.
Local constraints (watershed, aquifer, flood, demographics)
  1. County Office. Rockland Building Department third-party directory reference.
  2. Wikipedia / U.S. Census 2020. Rockland, Massachusetts. Population approximately 17,500; industrial mix; South Shore inland.
  3. Census Reporter. Rockland Town Profile. Demographics.
  4. Plymouth County Registry of Deeds. plymouthdeeds.com. Deed registry for Rockland (Plymouth County).
  5. MBTA. Holbrook/Randolph and Hanson commuter rail stations. Closest MBTA stations to Rockland.
  6. Abington/Rockland Joint Water Works. Source Water Assessment Program (SWAP) report. Hingham Street Reservoir, Myers Avenue Wells, Great Sandy Bottom Pond; documents the watershed boundaries and Zone II for the Rockland water supply.
  7. MassGIS / Bureau of Geographic Information. Aquifer / Zone II Wellhead Protection GIS layers. Zone II aquifer recharge zones for Rockland wells.
  8. Federal Emergency Management Agency. National Flood Hazard Layer / Flood Map Service Center. Rockland riverine Zone A along French Stream and Beaver Brook.
  9. North and South Rivers Watershed Association. WaterSmart / SepticSmart program. Rockland is one of 12 South Shore partner towns in the NSRWA WaterSmart program.

Nearby South Shore ADU Rules

Rockland borders Abington to the north (the two towns share the Joint Water Works), Hanover to the south, Hingham to the north, and Norwell to the east, with Holbrook close by to the north toward the Holbrook/Randolph commuter rail station. All are home territory for BuildX, the same neighborhoods we build in.

Abington Abington ADU rules Hanover Hanover ADU rules Hingham Hingham ADU rules Norwell Norwell ADU rules Holbrook Holbrook ADU rules

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)

Upper Cape Cod (4)

Bridgewater Area (5)

Ready for a parcel-specific answer? A free Project Clarity Call gets you a one-pager covering zoning, sewer or septic, the Hingham Street Reservoir watershed, FEMA flood zone, wetlands, and aquifer status for your specific Rockland address.
Schedule Project Clarity Call

Thinking about an ADU in Rockland?

BuildX can review your Rockland parcel for zoning, sewer or septic, the Hingham Street Reservoir watershed protection district, FEMA flood zone, wetlands, and aquifer overlay issues before you spend money on design or permitting. Rockland is BuildX home territory, so we know the constraints that drive your project and the Permit Eyes process you will use to file it.

Schedule Project Clarity Call Call BuildX (781) 627-7000
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.