One great opportunity for homeowners to help increase the supply of affordable housing and create a source of rental revenue or house a loved one is to build a second unit on their property. These tiny apartments are allowed in many neighborhoods across San Mateo County and can often fit in basements, garages, or backyards. Several recent rule changes have made it easier than ever before to get started and hundreds of homeowners have already taken advantage. For examples of second unit designs, a calculator to estimate if a second unit pencils out for your situation, and more information on the second unit permitting and construction process, please visit our companion website, the Second Unit Resources Center of San Mateo County.

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