Most residential zone districts, through an administrative use permit, allow for either permanent or temporary (i.e. for medical purposes) secondary dwelling units. In order to qualify, the proposed development and property must meet a list of criteria which is specific to that zone district.
For example, the criteria stated for an accessory dwelling unit within the rural zone can be located under Whatcom County 20.36.132 (1) – (13). Please be aware that the minimum lot size for permanent detached units is different in each zone district.