The Following is a list of links to various Los Angeles Agencies and other resources you may find useful. We here at Bella Builders can answer many of your questions or we can set an appointment for consultation.
See our Contact Page
Links:
https://www.ladbs.org/adu/standard-plan-program/approved-standard-plans
https://www.cslb.ca.gov/OnlineServices/CheckLicenseII/CheckLicense.aspx
https://www.hcd.ca.gov/policy-research/accessorydwellingunits/docs/cc%20adu%20finance%20guide%20for%20homeowners%20v5%203.18.21_ada.pdf