Establishes the joint select committee on accessory dwelling units.

Requires the committee to examine ways of increasing affordable rental housing through accessory dwelling units by: (1) Reviewing accessory dwelling unit ordinances adopted by jurisdictions planning under RCW 36.70A.040;

(2) Considering policies pertaining to the siting of accessory dwelling units, including policies permitting the units to be sited on all parcels where single-family residences are allowed; and

(3) Considering policies pertaining to occupant requirements, allowable floor areas, off-street parking, processing related permits, unit registration, and applicable state and local codes.

Directs the committee to report its findings and recommendations to the appropriate committees of the legislature by December 1, 2007.