Board warns homeowners that conditioned-room renovations may trigger septic upgrades

Aug 15, 2026

Sherborn Board discussed two remodeling cases (1 Whitney St. and 51 Western Ave.) where adding or conditioning rooms could trigger state requirements to upgrade antiquated cesspools or septic systems; staff suggested alternatives such as converting to unconditioned three-season rooms or reconfiguring interior space.

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The Board of Health reviewed two separate building applications in the same neighborhood that raised questions about whether remodeling would require septic-system upgrades.

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