How much does an ADU cost in San Diego?
— three plans at $299,000 to $585,000, what the number includes,
and the site-work items that move it. The page nobody else in this
county will write. Reviewed August 2026.
San Diego ADU rules and requirements
— sizes, setbacks, parking, impact fee thresholds, coastal and
fire-zone requirements, and the three law changes that landed in
January 2026. Reviewed 12 October 2026.
How to finance an ADU in San Diego
— the four routes compared, including the one that is a trap if
your mortgage is from 2021, plus a calculator that shows what your
equity actually reaches. Reviewed October 2026.
Garage to ADU conversion in San Diego
— $100,000 to $140,000, why it is the one job we cannot put a
fixed price on, and the five conditions that decide where in that
range your garage lands. Reviewed 12 October 2026.
ADU rental income in San Diego
— what these rent for by size, set against the monthly payment on
our own prices, including the months where the rent does not cover
it. Reviewed 12 October 2026.
