Understanding modular permits in California

Permitting is where most modular questions get vague, so here's the part that clears up the confusion: a factory-built home is approved in two places, not one.

The home itself — the structure, the wiring, the plumbing, everything built inside our factory — is inspected and approved at the state level, in the factory, as it's built. That's a meaningful difference from a site-built home, where a local inspector visits your lot at each stage. By the time your modules reach your property, that portion of the approval is already done.

What still runs through your local jurisdiction is everything attached to the ground: zoning and setbacks, the foundation, utility connections, grading, and the final occupancy sign-off. This is where your timeline actually lives. A straightforward lot in a jurisdiction familiar with factory-built homes moves quickly. A constrained site, a coastal or hillside overlay, or a jurisdiction that rarely sees modular will take longer — not because modular is harder, but because local review is local review.

The practical upshot: the two approvals run in parallel, which is part of why the overall schedule compresses. We coordinate the state side and guide you through the local side, and we'll tell you in writing which is which before you commit. If you're adding an ADU, the rules are generally friendlier than for a primary residence — worth asking about specifically.

One caveat worth stating plainly: requirements vary by county and city, and they change. Treat this as the shape of the process, not a substitute for confirming details with your local jurisdiction.