ADU Rules in Holbrook, MA
Yes. Holbrook allows ADUs by-right under Massachusetts state law, up to 900 sq ft. The friction is not zoning. It is whether your parcel is on MWRA municipal sewer or private septic, the Cochato River and Brockton Reservoir watershed overlay, and the Norfolk County recording details at closing.
Call BuildX: (781) 627-7000
Holbrook ADUs are legal under state law
No separate local ADU bylaw documented · State law applies (760 CMR 71.00)Holbrook does not have a separate local ADU bylaw amendment documented after the statewide law took effect. That means your project is governed by Massachusetts state law: 760 CMR 71.00 and M.G.L. c. 40A §3 as modified by the Affordable Homes Act [760 CMR 71] [MGL 40A]. Protected-use ADUs are permitted by-right in zones that allow single-family dwellings, up to 900 square feet or 50% of the principal home's gross floor area, whichever is smaller. No special permit. No public hearing. Confirm with the Holbrook Building Department whether Town Meeting has acted on a local ADU amendment since the state law took effect.
Can I build an ADU in Holbrook, MA?
Yes. Holbrook allows detached, attached, and interior-conversion ADUs by-right under Massachusetts state law (760 CMR 71.00) in zones that allow single-family dwellings, up to 900 sq ft or 50% of the principal home, whichever is smaller. The Boston Globe profiled a real 600 sq ft modular ADU built in Holbrook in December 2025.
Show the state-law path and what "operating on state default" means
In the absence of a documented Holbrook ADU bylaw amendment, your project is governed by Massachusetts state law. In practice that means less local discretion, not more. Under 760 CMR 71.00 (effective in early 2025) and M.G.L. c. 40A §3 [760 CMR 71] [MGL 40A]:
- Size: Up to 900 sq ft, or 50% of the principal home's gross floor area, whichever is smaller
- Approval: By-right with a building permit in zones that allow single-family dwellings. No special permit can be required for a protected-use ADU.
- Owner-occupancy: Cannot be required. State law preempts any local owner-occupancy mandate.
- Parking: No additional off-street parking can be required within 0.5 miles of a transit station (see the Holbrook/Randolph Station card below).
Any inconsistent local provisions are unenforceable for protected-use ADUs. Holbrook combines the Building Inspector and Zoning Enforcement Officer in one position [Building Dept], so questions about zoning and zoning maps go to the same office that issues your permit. That is a one-stop contact, which simplifies the path.
Confirm Holbrook's current administrative posture, and whether any local ADU amendment has been adopted since the state law took effect, with the Holbrook Building Department at (781) 767-9062 before you design.
Garage conversion ADU
A common variation of either the detached or attached ADU path, depending on the garage configuration. With Holbrook operating on the state-default path, a garage conversion 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, replacement of the garage door with proper wall and window framing, and parking compensation if original parking spaces are lost
Holbrook ADU Rules at a Glance
The six things most homeowners ask first. Tap "View all rule details" for the complete data set.
View all Holbrook rule details
- ADU types allowed: Detached, attached, interior conversion
- Governing rule: State law 760 CMR 71.00 and M.G.L. c. 40A §3 (no documented local amendment)
- Local ADU bylaw: None documented post statewide law. Confirm with Building Department.
- Owner-occupancy: Cannot be required (preempted by state law)
- Long-term rental: Allowed
- Short-term rental: Confirm Holbrook's local STR policy with the Building Department
- Sewer status: Most of town on MWRA municipal sewer; some parcels on private septic
- Sewer authority: Massachusetts Water Resources Authority (MWRA); Holbrook is a member community for sewer
- Watershed overlay: Cochato River and Brockton Reservoir protection (eastern and southern town)
- Coastal flood: None. Holbrook is inland.
- Transit parking exemption: Within 0.5 miles of Holbrook/Randolph Station
- County: Norfolk County (Dedham deed registry)
- Setbacks, lot size, height: Per the Holbrook Zoning Bylaw district schedule. Confirm exact dimensional values with the Holbrook Planning Department at (781) 767-9061.
- Permitting platform: PermitPro by Patriot Properties (online)
- Permit office: Building Inspector / Zoning Enforcement Officer (combined role)
Why BuildX Knows Holbrook ADUs
Holbrook is part of BuildX's South Shore home territory. We work Holbrook ADU projects every month and know the MWRA municipal sewer system, the Cochato River and Brockton Reservoir watershed overlay, and the Norfolk County recording details that drive your project.
Holbrook Home Territory
Holbrook is part of BuildX's South Shore home territory. We are your neighbors, not a regional contractor. We work here, so we know Holbrook ADU parcels, the MWRA sewer line, the watershed overlay, and the Norfolk County closing details 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, watershed overlay, and transit-distance parking exemption.
We Work Holbrook Every Month
Holbrook is part of BuildX's South Shore home territory. We work Holbrook every month designing ADUs for your neighbors. We bid Holbrook ADU projects regularly as part of our standard business operations. We don't have a Holbrook build on the board yet. Yours could be the first.
Nearby BuildX ADU projects: the Vasquez ADU in Brockton, which borders Holbrook to the southwest, and the Glauben ADU in Abington, just to the southeast. And across the South Shore, BuildX has an active pipeline of ADUs 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 Holbrook ADU?
Holbrook is small, about 7.4 square miles, and mostly residential. The bylaw is rarely the obstacle. Your parcel's sewer status, watershed overlay, and transit distance are usually what move project cost and timeline. The factors that come up most often:
Do I need septic approval for a Holbrook ADU? Sewer win
Likely a non-issue if: your parcel is on the MWRA municipal sewer line, which serves much of Holbrook. Likely an issue only if your address is on private septic. Confirm your specific parcel's status before design.
For most Holbrook parcels, no. Holbrook is a Massachusetts Water Resources Authority (MWRA) sewer community [MWRA]. Most of town is on municipal sewer, so Title 5 is not the gating cost variable for most Holbrook lots. No septic capacity calculation. No reserve-area requirement. No $30,000 to $60,000 septic-upgrade wildcard.
If your parcel is on private septic (the minority in Holbrook, more common near the eastern and southern watershed corridor), Title 5 review still applies per 310 CMR 15.000 [Title 5]. Adding a bedroom adds wastewater design flow, so a capacity check is required and an older system that cannot carry the additional ADU bedroom may need an upgrade.
Cost impact: $0 for most sewered parcels. $30,000 to $60,000 for a Title 5 capacity check plus possible system replacement on the minority of parcels on private septic.
We pull your parcel's sewer-versus-septic status on Day 1. For most Holbrook addresses, the answer is sewer, and the project gets dramatically simpler. Confirm the exact MWRA sewer service boundary for your street with the Building Department.
How does the Cochato River and Brockton Reservoir watershed affect ADUs? Overlay
Likely affects you if: your parcel is in the eastern or southern part of town, near the Cochato River or within the public water-supply watershed protection overlay, especially if the parcel is on private septic.
Holbrook borders the Cochato River, which feeds the Brockton Reservoir, a major water source for Brockton. Properties in the eastern and southern parts of town often sit within a watershed protection or aquifer protection overlay. ADU applications on these parcels, especially septic-served parcels, face additional review under both local and state regulations.
Cost impact: +$5,000 to $15,000 plus roughly 30 to 60 days of additional design review when the overlay is triggered.
Wetland resource areas carry a 100-foot buffer baseline under the state Wetlands Protection Act (MGL c.131 §40), and a local wetlands bylaw may extend that. Confirm buffer trigger thresholds and the Conservation Commission filing path for your parcel with the Building Department. We pull the watershed overlay map on Day 1 with parcel overlay analysis.
Does Holbrook/Randolph Station affect ADU parking? Transit
Likely affects you if: your parcel is near the western Holbrook town line toward Randolph, within 0.5 miles of the Holbrook/Randolph commuter rail station.
The Holbrook/Randolph Station sits on the Fall River/New Bedford Line (formerly the Middleborough/Lakeville Line), with service to South Station, Boston, via Braintree and Quincy Center [MBTA]. The Fall River/New Bedford service opened in 2025 as part of South Coast Rail [MBTA SCR].
The station is physically located on the Randolph side of the Holbrook/Randolph border, at Union Street and Center Street. The state-law 0.5-mile parking exemption is measured from the station regardless of which town it sits in, so Holbrook parcels near the western town line often qualify for no additional off-street parking. Worth checking your parcel's distance via MassGIS if you are near the Randolph border. We pull the transit-distance overlay on Day 1.
Does it matter that Holbrook is in Norfolk County? Closing
Yes, at closing. Holbrook is in Norfolk County, with deed recordings handled by the Norfolk County Registry of Deeds in Dedham [Norfolk Deeds]. Most of BuildX's South Shore work is in Plymouth County, which uses a different registry. The difference is administrative, not a barrier: deed searches, restrictive covenants, and any recorded property documents go to Dedham rather than the Plymouth County office.
It is a small detail, but it matters at closing. We coordinate Norfolk County recordings as part of the project so the registry difference does not surprise you.
Will an ADU change my Holbrook property assessment? Tax
Yes. Holbrook's Board of Assessors conducts annual property inspections, interior and exterior, for assessment purposes [Assessors]. Adding an ADU adds assessable square footage, so your property tax assessment will update. This is standard for any property improvement and is not specific to ADUs, but it is worth budgeting for. The assessor inspection is for property tax assessment only. It is not a rental registration regime.
What Does a Holbrook ADU Cost?
A Holbrook ADU should not be priced from square footage alone. The biggest swing factor here is sewer versus septic, and for most of town the answer is sewer, which keeps the project simpler than in septic-heavy South Shore towns.
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.
Holbrook-specific cost premium factors
See full ADU pricing and floor plans. For a Holbrook-specific quote, call (781) 627-7000. We will not quote a Holbrook ADU until we know whether your parcel is on MWRA municipal sewer or private septic and whether it sits within the Cochato River and Brockton Reservoir watershed overlay.
How the Holbrook ADU Permit Process Works
One building permit, by-right under state law. The Building Inspector who reviews it is also the Zoning Enforcement Officer, so it is a single office for both questions.
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1
Parcel review
1 to 2 weeks
BuildX maps your parcel against zoning, sewer or septic status, the Cochato River and Brockton Reservoir watershed overlay, wetlands buffers, and transit-distance parking exemption before quoting. This step determines whether the rest of the timeline is straightforward or extended. MassGIS and parcel overlay checks happen on Day 1.
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2
Building permit
Submitted online; review varies by completeness and queue
Submit the complete application package through PermitPro online [PermitPro]: a site plan showing setbacks and dimensions, floor plans (existing and proposed), and compliance with the state-default by-right ADU rules (900 sq ft or 50% of the principal home). The Building Inspector / Zoning Enforcement Officer reviews it in one office, with no separate zoning step [Building Dept].
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3
Overlay reviews (if triggered)
Add 30 to 90 days when triggered
Title 5 septic review (MassDEP 310 CMR 15.000) only if your parcel is on private septic, and Cochato River and Brockton Reservoir watershed overlay review if your parcel falls within the protection corridor. Most sewered Holbrook parcels skip the Title 5 step entirely.
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4
Construction, inspections, and assessment update
Through completion
Construction inspections run through the Building Department. After the final inspection and Certificate of Occupancy, the Board of Assessors updates your property assessment for the new ADU square footage as part of its annual inspection program.
Overall planning assumption: roughly 60 to 90 days for a sewered Holbrook parcel with no overlay complications. Add 30 to 90 days for septic review or watershed-overlay review.
Holbrook smaller-town staffing means a slightly slower pace than larger towns, so call ahead. Confirm current administrative posture at (781) 767-9062. The Building Department is closed Fridays; Tuesday hours run to 6:30 PM.
What Holbrook Zoning Districts Allow ADUs?
Holbrook is a small, mostly residential town. With no documented local ADU amendment, the state-default by-right path (900 sq ft or 50% of the principal home) applies across the residential districts that allow single-family dwellings. The town also carries watershed and aquifer protection overlays in the eastern and southern parts of town.
Single-family residential districts Where most ADUs go
- Min lot: Per district schedule. Confirm with Planning Dept.
- Min frontage: Per district schedule. Confirm with Planning Dept.
- Max coverage: Per district schedule. Confirm with Planning Dept.
- Max height: Per district schedule. Confirm with Planning Dept.
ADU rules: Detached, attached, and interior-conversion ADUs are allowed by-right under state law in zones that allow single-family dwellings, up to 900 sq ft or 50% of the principal home. No special permit.
What this means for your ADU: Holbrook's current zoning bylaw URL and dimensional schedule were not documented at the time of writing. Confirm exact lot size, frontage, setback, and height values for your district with the Holbrook Planning Department at (781) 767-9061. State-default ADU size rules apply regardless of the local dimensional schedule.
Watershed and aquifer protection overlays
Watershed and aquifer protection overlays apply to properties in the eastern and southern parts of town, along the Cochato River and Brockton Reservoir corridor. Overlays modify, but do not prevent, ADU construction. Septic-served parcels in these areas face the most additional review.
Overlay analysis happens on Day 1 with MassGIS layers. We pull your parcel's overlays before quoting.
Holbrook combines the Building Inspector and Zoning Enforcement Officer in one role, so questions about zoning and zoning maps go directly to the Building Department [Building Dept]. Confirm the current Holbrook Zoning Bylaw and district dimensions with that office.
Sewer or Septic? Holbrook Is Mostly Sewered.
This is the single biggest cost variable in any Holbrook ADU project, and for most of town it lands in your favor. Holbrook is a Massachusetts Water Resources Authority (MWRA) sewer community [MWRA]. Most of town is on municipal sewer, which removes the Title 5 question that gates many South Shore ADU projects. (The "Tri-Town" name that Holbrook shares with Randolph and Braintree is the regional drinking-water district, not the sewer system.)
Show Title 5, water utility, and watershed details
- Sewer authority: Massachusetts Water Resources Authority (MWRA); Holbrook is a member community for sewer [MWRA]
- Water utility: Tri-Town Water District (Braintree, Randolph, Holbrook), Great Pond Reservoir supply
- Septic upgrade cost (if needed): $30,000 to $60,000 typical, on the minority of parcels on private septic
- Title 5 trigger: Applies to septic-served lots only. Adding a bedroom adds design flow, so Title 5 review is required on those parcels [Title 5]
- Watershed: Cochato River and Brockton Reservoir protection overlay in the eastern and southern town
Most Holbrook parcels are on MWRA municipal sewer, which is a clear win for ADU projects. A minority of parcels are on private septic. We do not quote a Holbrook ADU until we know which side of that line your parcel sits on, and we confirm the exact MWRA service boundary for your street with the Building Department.
Holbrook History and ADU Context
Holbrook does not carry the deep historic-district overhead of a Plymouth or a Hingham, so historic review rarely drives an ADU project here. A little context on the town helps frame the parcel-level questions that do matter.
A short history of Holbrook
Holbrook was incorporated on February 29, 1872, the last town created from the former Braintree lands. It was previously East Randolph and was divided from Randolph along the Old Colony Railroad track, which is why the commuter rail station today sits right on the Holbrook/Randolph border. The town is named for benefactor Elisha N. Holbrook, who funded the town hall and library.
Members of the 54th Massachusetts Volunteer Infantry, the Civil War regiment, are buried in Union Cemetery. Among notable residents, Andrew Card, former White House Chief of Staff, grew up in Holbrook. There is no documented town-wide historic design review, so for most ADU projects historic review is not a factor. Confirm any local historical commission jurisdiction with the town if your parcel sits near a recognized historic resource.
Has Anyone Actually Built an ADU in Holbrook?
Yes. A major newspaper photographed a real, occupied ADU built in Holbrook under the new state law.
The Boston Globe profiled a 600 sq ft modular Accessory Dwelling Unit built in Holbrook in its December 2025 coverage of the new state ADU law. A real ADU, with real interior photographs, built and occupied in Holbrook under the new law.
That is real-world validation. The statewide first-half-2025 data showed 884 ADU applications across 170 communities, with roughly 550 approved, according to the state's Executive Office of Housing and Livable Communities [Boston Globe]. There are no reports of permit denials or Attorney General challenges specific to Holbrook as of our last review. If you live in Holbrook, your project is part of a real, growing trend, not an untested one.
Holbrook Building Department
Holbrook Building Department / Zoning Enforcement
- AddressHolbrook Town Hall, 50 North Franklin Street, Holbrook, MA 02343
- Phone(781) 767-9062 · alternate (781) 767-9063
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Hours
Monday7:30 AM to 4:30 PMTuesday7:30 AM to 6:30 PMWednesday7:30 AM to 4:30 PMThursday7:30 AM to 4:30 PMFridayClosed
- Combined roleThe Building Inspector also serves as the Zoning Enforcement Officer [Building Dept]. One office for both building and zoning questions.
- Online permittingPermitPro by Patriot Properties (web-based) [PermitPro]
- Planning Department(781) 767-9061 (separate line)
- Building Departmentholbrookma.gov/161/Building-Department
Holbrook is a smaller town with a smaller staff, so call ahead and expect a slightly slower pace than a large town. The Tuesday evening hours to 6:30 PM are useful for after-work conversations, and the department is closed Fridays.
Questions to ask when you call Holbrook
- Has Holbrook adopted any ADU-specific bylaw amendment since the state law took effect, or is the town operating on the state default?
- Is my parcel on the MWRA municipal sewer line or on private septic?
- Does my parcel fall within the Cochato River and Brockton Reservoir watershed protection overlay?
- Is my parcel within 0.5 miles of Holbrook/Randolph Station for the parking exemption?
- What are the lot size, frontage, setback, and height requirements for my zoning district?
- What is Holbrook's short-term rental policy for an ADU?
Explore Holbrook ADU Topics
Jump to deep-dive sections on this page.
Holbrook ADU FAQs
Can I build a detached ADU in Holbrook?
Yes, by-right under Massachusetts state law. With no documented local ADU amendment, Holbrook operates on 760 CMR 71.00 and M.G.L. c. 40A §3. Detached, attached, and interior-conversion ADUs are all permitted by-right in zones that allow single-family dwellings, up to 900 square feet or 50% of the principal home's gross floor area, whichever is smaller. The Boston Globe profiled a 600 sq ft modular ADU built in Holbrook in December 2025.
Do I need a special permit for a Holbrook ADU?
No. A protected-use ADU under state law is by-right, with a building permit only. No special permit can be required and no public hearing is needed. In Holbrook the same office handles both building and zoning review, because the Building Inspector is also the Zoning Enforcement Officer. Submit through the PermitPro online portal.
Do I need to live there?
No. Massachusetts state law (760 CMR 71.00) preempts any local owner-occupancy requirement for protected-use ADUs. In practice, you may rent the principal dwelling and live in the ADU, or live in the principal dwelling and rent the ADU. Confirm Holbrook's current administrative posture with the Building Department at (781) 767-9062 before signing a lease.
Can I Airbnb my Holbrook ADU?
Long-term rentals are clearly allowed. State law permits towns to restrict short-term rentals locally, and Holbrook's specific short-term rental policy for ADUs is not documented in our research. Confirm Holbrook's STR policy with the Building Department before counting on a short-term rental income model. Long-term rental is the safe assumption.
How big can a Holbrook 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 state by-right cap under 760 CMR 71.00. Because Holbrook is operating on the state default, this is the controlling size rule.
Sewer or septic in Holbrook?
Most of Holbrook is on MWRA municipal sewer, which is a clear advantage for ADU projects: no Title 5 capacity calculation and no septic-upgrade wildcard. A minority of parcels, more common near the eastern and southern watershed corridor, are on private septic, where a Title 5 capacity check plus possible system replacement can add $30,000 to $60,000. We confirm your parcel's status before any design work.
What does a Holbrook 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. Holbrook-specific drivers move a project within and beyond that band: a parcel on private septic can add $30,000 to $60,000 for a Title 5 upgrade, though most of town is sewered and avoids that. The Cochato River and Brockton Reservoir watershed overlay adds roughly $5,000 to $15,000 and design-review time. For a property-specific quote, call (781) 627-7000.
How long does a Holbrook ADU permit take?
Plan on roughly 60 to 90 days for a sewered Holbrook parcel with no overlay complications, since the path is a single by-right building permit. Add 30 to 90 days for Title 5 review on a septic parcel or for Cochato River and Brockton Reservoir watershed-overlay review. Holbrook submits permits through the PermitPro online portal, so you can track your application.
Does it matter that Holbrook is in Norfolk County?
Mostly at closing. Holbrook is in Norfolk County, so deed recordings go to the Norfolk County Registry of Deeds in Dedham, not the Plymouth County registry that most South Shore towns use. It is an administrative difference, not a barrier. We coordinate Norfolk County recordings as part of the project.
Who do I call about building an ADU in Holbrook?
For official town process questions (permits, fees, inspector availability, PermitPro account help, building code interpretation, zoning maps), call the Holbrook Building Department, which also handles zoning enforcement, at (781) 767-9062. For planning-specific questions, the Planning Department line is (781) 767-9061.
For parcel-level feasibility, cost estimates, design options, sewer-versus-septic confirmation, 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 state law, town process, local constraints, and media records. Holbrook has no separate local ADU bylaw on record, so there is no town-law group.
View all 15 sources, grouped
- Commonwealth of Massachusetts. Accessory Dwelling Units (760 CMR 71.00). The primary governing rule for Holbrook ADUs: protected-use definition, 900 sq ft cap, by-right path.
- Massachusetts General Laws. M.G.L. Chapter 40A, Section 3. Affordable Homes Act ADU provisions.
- MassDEP. Title 5 (310 CMR 15.000) Compliance for ADUs FAQ. Applies to the minority of Holbrook parcels still on private septic.
- Town of Holbrook. Holbrook Building Department. Building Inspector and Zoning Enforcement Officer (combined role), hours, contact information.
- Town of Holbrook. Holbrook Zoning Board of Appeals. Appeals path if a state-default dispute arises.
- Town of Holbrook. Holbrook PermitPro (Patriot Properties). Online permit application portal.
- Town of Holbrook. Holbrook Assessors Inspection Program. Annual property inspection context for assessment updates.
- Massachusetts Water Resources Authority (MWRA). MWRA sewer service, Holbrook. Holbrook is an MWRA sewer member community, the reason Title 5 is not the gating cost variable for most Holbrook lots. ("Tri-Town" refers to the separate Braintree, Randolph, and Holbrook drinking-water district.)
- MBTA. Holbrook/Randolph Commuter Rail Station. On the Fall River/New Bedford Line; drives the transit-distance parking exemption.
- MBTA. Fall River/New Bedford Line. South Coast Rail service operating since 2025.
- Norfolk County Registry of Deeds. Norfolk County Registry of Deeds (Dedham). Holbrook deed recordings; different registry from Plymouth-County South Shore towns.
- Massachusetts Code Enforcement. Norfolk County code enforcement listings. Regional code-enforcement context.
- U.S. Census 2020. Holbrook, Massachusetts. Population, area, geography, and town history.
- Census Reporter. Holbrook Town Profile. Demographics and household composition.
- Andrew Brinker, Boston Globe, December 1, 2025. State ADU law coverage featuring a 600 sq ft modular Accessory Dwelling Unit built in Holbrook, with interior photographs. Documents a real, occupied ADU built in Holbrook under the new state law, plus the statewide first-half-2025 application figures.
Nearby South Shore ADU Rules
Holbrook borders Abington to the southeast, Brockton to the southwest, Avon to the west, and Weymouth to the east. 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 Holbrook?
BuildX can review your Holbrook parcel for zoning, sewer or septic, the Cochato River and Brockton Reservoir watershed overlay, the Holbrook/Randolph Station parking exemption, and Norfolk County recording details before you spend money on design or permitting. Holbrook is BuildX home territory, so we know the constraints that drive your project and the by-right path under state law.
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.