San Diego ADU Builders
San Diego is one of California's most ADU-friendly cities, with bonus ADU programs and streamlined permitting. Its design-build firms are known for transparent, per-project pricing — several publish real example budgets in the $254K–$369K range.
3 builders based in the San Diego area
Cost basics
Detached ADU projects commonly run $150,000–$400,000+ depending on size and finishes; garage conversions cost less. Builders focused on the San Diego area can give project-specific pricing — several publish real example budgets on their profiles.
Permit basics
State law requires by-right approval of compliant ADUs in most cases, but local rules (setbacks, height, parking, historic districts) vary. Confirm requirements with your city's planning department before finalizing a design — or ask a local design-build firm, which handles permitting as part of the project.