Shingle roofs in San Diego must be installed under California code and local city rules

https://cruzblcb351.pinehavenscope.com/posts/tile-and-low-slope-roof-systems-in-san-diego-what-the-code-framework-emphasizes

Shingle roofs in San Diego must be installed under California code and local city rules, and reroofing often requires a permit, especially when roof covering renewal is involved.