ADU builder
San Marino.

ADU projects in San Marino are usually quiet, detailed builds with strict site protection. Foundations, garage slab reinforcement, and utility trenching have to account for mature trees, estate lots, and design review near historic homes. Plan check runs through City of San Marino Planning and Building with Title 24 energy compliance and structural review on every permitted unit. Garage conversions often move faster than detached new-builds because the shell exists; hillside lots, tight side yards, and long utility runs can still add foundation and MEP cost. Most ADU construction in San Marino lands in the $115,000-$330,000 range — garage conversions from $105k–$170k, detached units from $220k–$340k. Permit fees, utility connections, soils reports, and design are quoted separately by line item. Finish level, fire sprinklers, and separate utility meters are the usual cost drivers after site conditions. Huntington Library-area homes can involve landscape and preservation sensitivity. We coordinate HOA/ARC packets — exterior materials, parking replacement, access plans — in parallel with city submittals when they apply. We already build in your backyard. Here's what we handle for San Marino homeowners.

We build pools and ADUs on the same lots across Southern California. When both are planned together, shared excavation, grading, and utility trenching often saves 10–15% versus separate projects.