No, rooming houses are only allowed in multi-family and commercial zones, however the code does allow the following when living together as a single, not-for-profit housekeeping unit:
a. A group of not more than four related and unrelated adults and their related minor children, but not to exceed a total of eight related and unrelated persons; or
b. Not more than eight disabled persons, whether adults or minors, living together in a consensual residential living arrangement, but not to exceed a total of eight persons; or
c. State licensed adult family homes as defined by RCW 70.128.010; or
d. State licensed foster family homes and group care facilities as defined in RCW 74.15.020.