Zoning, building permits and septic rules in Town of Plainville, Massachusetts
Town of Plainville is a town in Norfolk County, Massachusetts. Town of Plainville adopts its own zoning, so inside its limits Town of Plainville’s rules apply, not the county’s. Septic permits inside Town of Plainville come from Town of Plainville. 8 rules below are quoted from official sources and independently re-checked, most recently on October 23, 2026. Rules for unincorporated land are on the Norfolk County page.
Answers from the rulebook for Town of Plainville
Town of Plainville’s own rules
Local zoningPresent (with conditions)
All land inside Plainville town limits; Plainville town's own zoning bylaw (Code of the Town of Plainville, Chapter 500 Zoning) governs use and dimensional standards there, administered by the building commissioner as zoning enforcement officer.
Zoning bylaw is chapter 500 of the Town code; use and intensity requirements vary by district (see zoning_districts and dimensional claims).
Accessory dwelling units are additionally governed by MGL c. 40A and 760 CMR 71.00 as stated in § 500-25.1.
Zoning districts inside Plainville town limits (the zoning map and § 500-12 district list).
Districts listed in § 500-12: RA and RB single-family residential; RC and RD general residential; CA, CB, CC commercial; CD, CI, IA, IB, IC industrial; GPD groundwater protection overlay; FPD floodplain; TCD town center.
District boundaries are shown on the zoning map referenced in § 500-13; the map itself was not opened.
“the town of plainville is hereby divided into the following types of districts: ra — single-family residential district”
Manufactured homesLimited
Mobile homes used as a dwelling inside Plainville town limits (Article III, use of mobile home as a dwelling).
Occupancy as a dwelling requires a special permit and the unit must be in a licensed mobile home park.
Exception: temporary occupation for a period not exceeding 12 months by the owner or occupier of a residence destroyed by fire or natural holocaust.
temporary occupation after fire or natural disaster: <= 12 months (owner or occupier of a residence destroyed by fire or natural holocaust)
“a mobile home shall not be occupied as a dwelling except as authorized by special permit and designated in a licensed mobile home park.”
Accessory dwellingsAllowed
Protected-use accessory dwelling units on a lot with an existing principal dwelling in a single-family residential zoning district inside Plainville town limits (§ 500-25.1).
Protected-use ADU must have a separate entrance, be a complete housekeeping unit with kitchen and bath, and not exceed one-half the principal dwelling's gross floor area or 900 sq ft, whichever is smaller.
Building commissioner issues the building permit once conditions in § 500-25.1(d) are met.
More than one ADU on a single-family lot requires a special permit from the planning board under MGL c. 40A § 3a and § 500-20.
The ADU and principal dwelling may not be divided onto separate lots.
Extends MGL c. 40A §§ 1A and 3 and 760 CMR 71.00.
ADU maximum size: <= 900 sq ft (or one-half the gross floor area of the principal dwelling, whichever is smaller)
“adus are permitted as of right per massachusetts general laws (mgl), chapter (c) 40a, §§ 1a and 3..”
Who permits septicLocal (with conditions)
On-site wastewater disposal systems for land inside Plainville town limits; administered by the Plainville Board of Health.
Board of Health regulations (ch. 767) state that Title 5 (310 CMR 15.000) and the local rules both apply; local rules add stricter protection.
Title 5 inspections, soil evaluators and installers must be licensed by the Plainville Board of Health.
“the applicant shall complete an application for site evaluation, on a form provided by the boh, at the boh office.”
Septic permitRequired
New or replacement on-site wastewater disposal systems inside Plainville town limits; Board of Health disposal system construction permit (DSCP).
A disposal system construction permit from the Plainville Board of Health is required before building construction on an on-site system.
Soil testing for seasonal high groundwater must be done after December 20 and completed before May 29 unless the Board changes the window by vote (search snippet only; not verified on an opened page).
“no building construction shall proceed until the boh has issued a dscp or otherwise approved the construction by use of form a”
Septic inspectionRequired
On-site wastewater disposal systems inside Plainville town limits; Board of Health agent inspection during construction.
Inspection requests must be made to the Board of Health office at least two business days before the scheduled inspection.
Ordinarily the stone under the septic tank, the completed work before backfill, and the finished grade are inspected; all pumps, floats and alarms must be tested.
Cesspools are treated as failed at a Title 5 inspection and must be upgraded.
inspection request notice: >= 2 business days
“every osds must be inspected by the boh agent before it is covered.”
Subdividing landRegulated (with conditions)
Division of land into lots inside Plainville town limits; Planning Board subdivision regulations.
Subdivision regulations are codified at chapter 540 Subdivision of Land of the Planning Board regulations (Division 4).
Hydrogeological evaluation is required for subdivisions not served by municipal sewer with five or more dwelling units (chapter 680, from search snippet; not verified on an opened page).
“division 4: planning board regulations chapter 523 adoption of codified regulations by planning board (§ 523-1 – § 523-7) chapter 540 subdivision of land (§ 540-1 – § 540-84)”
Still unanswered
We looked and could not find an official answer yet. Silence is not permission; ask Town of Plainville or Norfolk County directly.
Owner-builder exemption — Owner-builder construction inside Plainville town limits
Building code adopted — State building code as applied inside Plainville town limits
Building height — Building height in Plainville town limits, single-family residential district RA
Living in an RV — Long-term RV occupancy on private land inside Plainville town limits
10 more unanswered
Camping on your land
Tiny homes
Off-grid sanitation
Well permit
Mandatory utility hookup
Agricultural exemption
Driveway access
Building in a floodplain
Short-term rentals
Permit process
Each answer was extracted from an official source and independently re-checked against that source by a second reviewer. That is an evidence check, not legal advice. Rules change; confirm with the authority before you buy or build.
Unanswered questions are usually a sign that Town of Plainville publishes no rule on the point, not that none exists. Norfolk County’s page lists the county offices to call.
Off-grid gear
Going off-grid in Town of Plainville means bringing your own water and power. The kit we’d start with:
