Residential Density

Average Units per Acre of Newly Approved Residential Development

Silicon Valley

Accessory Dwelling Units

Approved or issued permits in lieu

Data Source:

City Planning and Housing Departments of Silicon Valley

Analysis:

Silicon Valley Institute for Regional Studies

Data are from Joint Venture Silicon Valley’s annual land-use survey of all cities within Silicon Valley. The 31 cities/counties included in the FY 2022-23 Building Affordable Housing analysis included Belmont, Brisbane, Burlingame, Campbell, Colma, Cupertino, Daly City, East Palo Alto, Fremont, Gilroy, Half Moon Bay, Hillsborough, Los Gatos, Millbrae, Milpitas, Monte Sereno, Morgan Hill, Mountain View, Newark, Pacifica, Palo Alto, Redwood City, San Bruno, San Carlos, San Jose, San Mateo County, San Mateo, Santa Clara County, Santa Clara, Saratoga, and South San Francisco; ADU count for 2022-23 also includes Foster City and Los Altos. Other cities/counties were not included because they either did not respond to the survey or they left the acreage question blank. Most recent data are for fiscal year 2023 (July 2022 through June 2023). Residential density was calculated as the average residential density of the participating cities/counties for each year. Beginning with FY 2014-15 the residential density calculation included accessory dwelling units (ADUs), and starting in 2018-19 they also included ADUs that were issued a building permit in lieu of a planning approval.

Beginning in 2008, the Land Use Survey was expanded to include cities northward along the U.S. 101 corridor (Brisbane, Burlingame, Millbrae, San Bruno and South San Francisco). In 2014, the Survey was further expanded to include all Silicon Valley cities (adding Colma, Daly City, Half Moon Bay and Pacifica). Beginning in 2020, the residential density calculation included accessory dwelling units (ADUs) that were issued a building permit in lieu of a planning approval.

Resources for Relevant Data and Reports (show)

Related Indicators: