Real Estate Law
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"To determine if an Accessory Dwelling Unit (ADU, also referred to as a mother-in-law apartment) is allowed on a given parcel, customers must know the zoning and lot size.
Generally, however, in unincorporated King County, accessory dwelling units are allowed in all zones except Mineral (M) and Industrial (I), provided that certain conditions are met. Please reference section 21A.08.030(B)(7)(a) in Chapter 21A.08 (PDF*) of the King County Code.
ADUs differ from accessory living quarters in that an ADU is allowed to have a kitchen or kitchen facilities as defined under KCC 21A.06.0662 in Chapter 21A.06 (PDF*) of the King County Code."http://www.kingcounty.gov/property/permits/FAQ/MyProperty.aspx#build
You can find the information under 21A.08