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Commission flags septic and lot-size limits for detached ADUs
Summary
Commissioners noted council direction that detached ADUs could be permitted but require larger lots or separate septic systems; septic capacity and drain-field layouts will affect where ADUs are feasible.
Commissioners discussed detached accessory dwelling units (DADUs) and the practical constraints created by septic systems and lot size. Chair said the council had previously required 30,000 square feet for a detached ADU where separate septic systems would be necessary. "If you're going to have a detached building, you're going to have 2 septic tanks, 1 for each building," the Chair explained.
Members emphasized that many town lots are not large enough to accommodate primary and secondary drain fields and that the commission must ensure the ordinance requires applicants to show septic and replacement-leach-field layouts on initial plans. Staff was asked to note septic constraints in the table and to identify where sewer or other infrastructure would change feasibility for DADUs.
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