California building permits

We index 2,438,193 building permits across 4 California metros — Los Angeles, San Francisco, San Jose, and 1 more — classified into real segments, parcel-joined, with field-level data-quality flags.

The largest segments statewide are Residential Alteration (49%), Commercial Alteration (18%), Multifamily Alteration (18%).

Counts are live from the classified index, refreshed nightly. Each metro links to its full breakdown — segments, permit types, and contractors.