Project costs that aren't direct construction — architecture, engineering, permits, soils reports, surveys, project management.
Soft costs typically run 10-20% of total ADU project cost in California. Often underestimated by homeowners who focus on the 'per-square-foot construction cost' alone.
Part of the BackyardADU California ADU Glossary — plain-English definitions of the regulatory, construction, and financing terms you'll encounter during a California ADU project.