Wareham’s published bylaw is two town meetings behind, and doesn’t mention ADUs
The Wareham zoning bylaw available to read is the 24 October 2023 edition. We searched all 9,407 lines of it: zero occurrences of “accessory dwelling”. Meanwhile two Attorney General decisions on Wareham ADU articles exist that this edition cannot possibly contain.
An in-law apartment, a backyard apartment, a garage or barn conversion — the state calls each of them an accessory dwelling unit. Wareham’s published bylaw calls them nothing at all, which is the difficulty.
The published Wareham bylaw contains no accessory dwelling unit provision. What it carries instead is a legacy “in-law” and “accessory apartment” scheme.
Two AG ADU decisions postdate that edition: case 11711, decided 28 May 2025, and case 11832, decided 24 November 2025. Case 11832 partially approved Article 15 and disapproved two provisions outright. So Wareham has an adopted ADU bylaw that the published text does not show, and a legacy accessory-apartment scheme that the published text does show and which no longer governs a protected-use ADU. Do not read the 2023 edition as current — on this subject it is not.
What the Attorney General deleted
Case 11832 partially approved Wareham’s Article 15 and struck two things out as conflicting with G.L. c.40A §3 and 760 CMR 71.00:
- Owner occupancy
- The owner-occupancy authorisation in the Sec. 862 definition was disapproved and deleted.AG MLU case 11832
- Dimensional cross-reference
- The Table 625 dimensional cross-reference in Sec. 863(6) was disapproved and deleted.AG MLU case 11832
Both deletions run in your favour. Owner occupancy cannot be required of a protected-use ADU in Wareham, and the Table 625 dimensional standards cannot be cross-applied to one — which is exactly the mechanism 760 CMR 71.03(3)(b)(2) exists to prevent.
760 CMR 71.03(3)(b)(2)What this means in practice
Two things follow, and the first one is uncomfortable but honest.
1. Nobody should quote you a Wareham figure off the published bylaw
Not a size cap, not a setback, not a parking count. The text that would carry them is not the text on the shelf. The adopted Article 15, as amended by the AG’s deletions, has to be read at the Town Clerk’s office. We do that on a live file rather than work from the 2023 edition.
2. The state floor applies regardless
Whatever Article 15 turns out to say, 760 CMR 71.00 sets a floor the town cannot go below: one protected-use ADU as of right on a single-family lot, up to 900 square feet or half your house’s gross floor area whichever is smaller, no more than one additional parking space, and no parking requirement at all inside a half-mile of a Transit Station.
760 CMR 71.02; 760 CMR 71.03The legacy provision you will be shown
The published edition carries six occurrences of “in-law” and four of “accessory apartment”. That is the scheme a counter conversation is likely to start from, and it is a pre-Act provision that does not govern a protected-use ADU. It is worth knowing it exists so you recognise it when it appears, and worth knowing it is not the rule that binds you.
Held 2023-10-24 edition, full-text searchUndersized lots, and the nonconforming gap
Wareham’s Sec. 1361(3) allows a building permit by right on a qualifying pre-existing lot provided all other aspects of the bylaw are met — a genuinely useful provision on the small Onset and West Wareham lots.
Sec. 1361(3)One honest gap in our own reading: Sec. 1361(4) requires a variance for a nonconforming alteration, but Sec. 1361 is drafted for structures other than single- and two-family, and we have not located the single-family rule in the held text. We do not know it, so we are not going to state it. On a live Wareham file that is one of the first things we settle.
Sec. 1361(4) — and the single-family rule, not located in the held editionSeptic on the Wareham coast
Wareham has extensive coastal frontage, and coastal parcels carry two compounding constraints: Title 5 design flow tested on the whole property’s bedroom count, and nitrogen-sensitive area requirements that can force a substantially more expensive system. Where a property sits relative to those boundaries changes the budget more than any zoning provision does.
310 CMR 15.000That is the measurement we go and take. Planning ranges are in our cost guide.
We will tell you whether it works before you spend anything
Southcoast Building is an approved Feasibility Study Provider under the Massachusetts Housing Partnership ADU Incentive Program. A licensed builder walks your property, reads your parcel against the bylaw, checks the septic and the grading, and tells you whether an ADU works here and roughly what it would cost. Thirteen of our studies have been approved by MHP to date.
Request your free study$0 to you under the MHP ADU Incentive Program · One study per property · Michael Bicho · (508) 269-2131
Where these figures come from
- Town of Wareham Zoning Bylaw, held edition dated 24 October 2023, 9,407 lines, searched in full 2 September 2026 — zero occurrences of “accessory dwelling”; six of “in-law” and four of “accessory apartment”. Also
Sec. 1361(3)andSec. 1361(4). - Massachusetts Attorney General, Municipal Law Unit, case 11711, decided 28 May 2025, and case 11832, decided 24 November 2025, Art. 15 — partially approved; the owner-occupancy authorisation in the
Sec. 862definition and the Table 625 dimensional cross-reference inSec. 863(6)disapproved and deleted. Neither decision can be in the held edition. - 760 CMR 71.00 — §71.02 definitions, §71.03(2)(b) parking, §71.03(3)(b)(2) dimensional relief.
- 310 CMR 15.000 (Title 5), including nitrogen-sensitive area requirements on coastal parcels.
Zoning changes, and a building inspector’s reading of it is the one that governs your permit. Nothing here is a determination about your property. It is what the adopted text and the Attorney General’s decisions say as of 8 September 2026.