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Realtor Bill Callahan says ADUs are adding housing but warns of sewer, setback and inspection rules
Summary
Realtor Bill Callahan described living in a detached accessory dwelling unit (ADU), urged owners to check sewer, setbacks and board-of-health rules, and said Massachusetts’ home-inspection law guarantees buyers the right to an inspection and prohibits seller interference.
Bill Callahan, a veteran Plymouth County realtor interviewed on the Registered Report, described a detached accessory dwelling unit (ADU) he lives in and offered step-by-step practical advice for homeowners considering an ADU.
"We have an accessory dwelling unit. We call the cottage. So, we're going to call it ADU. 900 square feet," Callahan said, and he stressed the three technical priorities for ADU projects: sewer/water connections, meeting zoning setbacks, and satisfying building- and health-department requirements (septic or sewer connections where applicable).
On consumer protection for buyers, Callahan advised that Massachusetts recently enacted a home-inspection rule and stressed buyers’ rights: "Every buyer in the Commonwealth is entitled to a home inspection. And I cannot say to them, and the seller can't tell me to say to them, skip the home inspection. … If the buyer doesn't sign it and we don't have it because some we you know he didn't do the home inspection, we unduly influenced him, that's breaking the law." He recommended sellers do their homework so inspections are not a surprise and cautioned against pressuring buyers to waive inspections.
For ADU applicants he suggested starting with zoning and the building inspector, checking the lot's zoning district (e.g., R1C, R2) to read setback charts online, and consulting the water department or board of health about sewer and septic needs. Callahan recounted spending money to add septic tanks and pumps to meet setback and leeching-field requirements for his detached unit and advised property owners to consider life-estate arrangements if living in an ADU owned by a family member.
Callahan said the statewide ADU law has accelerated local processing and estimated that ADUs are adding meaningful numbers of housing units: "It created four living units. I told you this. So, we built a new unit. That's one housing unit. We gave our do we sold our daughter a house, that's a second housing unit… in one transaction by us doing that first ADU, there were four housing units included." He and Buckley discussed an illustrative calculation that, at scale, could result in thousands of additional units if hundreds of ADU projects complete.
No formal vote or city/town action was announced during the interview; the segment conveyed practical steps, legal protections and examples intended to help homeowners and prospective ADU applicants. Callahan encouraged listeners to research setbacks and early contacts with local building departments before investing in design or construction.
