Make the garage a real,
permitted Rocklin ADU.

They don't call it The Granite City for the scenery. Rocklin grew up around quarries downtown, and that rock is the recurring problem on a conversion. A garage slab was poured to park a car, not carry a heated, occupied dwelling — usually four inches thick, no rebar, footings barely scratching the surface, and a slope toward the old door so rain drained out. Fixing that for habitable use means underpinning or a fresh slab. Easy enough until the excavator hits bedrock a foot down and you need a rock breaker, which swings the foundation number hard. Downtown lots near Front Street and the quarries run shallowest. We core-sample or trench-test on the first visit so the price isn't a wish.

Three Rocklin specifics shape the job. First, this is its own incorporated city in Placer County, so the permit goes through the City of Rocklin counter — its own plan-check queue and fee schedule, not Placer County's, not Sacramento's. Second, parking: California dropped the requirement to replace the off-street spaces you lose converting a garage, so you no longer carve a pad out of the front yard. That single change made thousands of these pencil. Third, fire walls — a detached garage tight to a property line, more common on older downtown lots near the quarries than out in the master-planned tracts, can trigger one-hour fire-rated assemblies on the near side. And the utility detail people miss: power here is PG&E. Not SMUD, not Roseville Electric. We confirm all of it against your parcel up front.