Planning board forwards ADU draft with caveat to resolve guest‑cottage and health‑department issues

Dorchester County staff presented draft accessory‑dwelling‑unit (ADU) language intended to conform local code to a state mandate. Staff described the ADU as ‘‘a secondary dwelling unit located on the same lot, parcel, or tribe of primary single family detached dwelling’’ that must remain accessory to the principal residence, cannot be separately conveyed, and ‘‘may not exceed 75% of the gross floor area of the principal dwelling.’'

Commissioners probed multiple implementation details: whether existing guest‑cottage allowances would be replaced or could coexist with ADUs, minimum square footage and life‑safety standards, and how septic and well capacity and health‑department approvals would be handled. Staff said ADUs must meet all county, state and federal permits and that well/septic approval from the county health department is required before issuing zoning or building permits; the health department review could be a limiting factor for many rural parcels.

Several commissioners urged staff to confirm whether guest cottages should remain permitted and whether language could be misread to allow both a guest cottage and an ADU on the same lot. County counsel noted ADU provisions can conflict with other zoning rules and suggested staff check compatibility; staff said they would research guest‑cottage language and amend the draft if needed. The planning board voted to forward a favorable recommendation to county council while directing staff to resolve any conflicts and verify health‑department and septic compliance requirements prior to council consideration.