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Board of Health approves deed‑restricted two‑bedroom ADU at 97 Spring Street

Tisbury Board of Health · April 30, 2026
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Summary

The Tisbury Board of Health approved converting a basement at 97 Spring Street into a deed‑restricted two‑bedroom accessory dwelling unit, contingent on a revised floor plan showing removal of a wall and installation of an additional 2,000‑gallon septic tank in series with the existing tank.

The Tisbury Board of Health on April 30 unanimously approved the conversion of basement space at 97 Spring Street into a deed‑restricted two‑bedroom accessory dwelling unit (ADU).

Board staff said the approved plan relies on continued use of an existing sewer ejector pump and the installation of an additional 2,000‑gallon tank in series with the property’s existing 2,000‑gallon tank to meet the Board’s ADU septic requirements. The Board’s approval is explicitly conditioned on the revised basement floor plan that shows the removal of a wall that would otherwise create an additional bedroom.

The Board (Vice Chair Malcolm Boyd; Clerk George Santos, who arrived at 4:15 p.m.) and staff (Health Agent Drew Belsky, Administrative Assistant Valerie Soushek) discussed whether the basement configuration would create more bedrooms than proposed and whether deed notice should be recorded to lock the approved bedroom count. The Board concluded that elevation of the space to an ADU required formal review because the use would no longer be treated as a single‑family dwelling under the interpretation discussed at the meeting.

The motion to approve was made, seconded, and carried unanimously. Conditions recorded by the Board require: (1) the approval apply only to the revised plan that shows removal of the referenced wall so the ADU remains a two‑bedroom unit; (2) installation of the additional 2,000‑gallon tank in series with the existing tank unless a revised design is later approved through the required review process; (3) recording of a deed restriction limiting the basement unit to two bedrooms and filing a copy of that restriction with the Board of Health office; and (4) compliance with Title 5, Board of Health requirements, and any other required plumbing or building approvals. The approval is based on the plans and representations presented to the Board; any material change may require further review.

The Board accepted the minutes for the meeting before adjourning at about 6:45 p.m.