Commissioners clarify ADU rules and critical‑area protections

Nicole told the commission that under recent law Richland must allow at least two accessory dwelling units on lots that permit single‑family homes, and that ADUs are not counted toward residential density limits. She cautioned that while the rule removes a regulatory barrier, ADUs remain costly to build and participation rates are uncertain: "ADUs are still expensive to newly build and even do conversions that can be costly," she said.

Commissioners asked whether critical‑area buffers and protections would override the ADU allowance; Nicole confirmed that if a site is encumbered by a critical area or buffer, the ADU allowance does not supersede those protections. The commission also discussed how ADUs interact with middle‑housing provisions and how design standards are limited by state guidance to objective measures rather than subjective style choices. Staff said more detailed design‑standard language and code examples will be provided in a later packet.