"Dwelling, single family ("Single family dwelling") means a dwelling containing one dwelling unit, or the dwelling unit and an attached or detached accessory dwelling unit. This term shall also include factory built housing constructed pursuant to the standards delineated in RCW 43.22.455, as amended, and rules and regulations promulgated pursuant thereto. (Added by Amended Ord. 02-064, Dec. 9, 2002, Eff date Feb. 1, 2003; Amended by Amended Ord. 21-018, June 9, 2021, Eff date June 19, 2021).