San Mateo County Planning Commission will hold a Study Session at their Oct 28, 2015, meeting (agenda - presentation) on the County’s work to address second dwelling unit issues in the Unincorporated County, including revisions to the County’s Second Unit Ordinance and potential policy approaches from the Board of Supervisors’ Affordable Housing Study Session and White Paper.

County affordable housing initiatives status update matrix 10/15/15.

Local Coastal Program background: LCP Policy 3.22 limits the total number of approved second units to 466 in the Coastal Zone. Size of the units is limited to 700 s/f or 35% of the floor area of the principal residence, whichever is greater. Second units are not permitted on non-conforming parcels less than 5,000 s/f.  LCP Policy 1.23 limits the maximum number of new dwelling units built in the urban Midcoast to 40 units each calendar year, but exception is made for deed-restricted affordable units.