Approval boundary

California Factory Built Housing approval documents, presented without over-claiming.

The plan review letters identify R-22345 and R-22348, dated July 15, 2026, expiring July 14, 2029. They cover factory-built structure review only; on-site items still require local review and approval.

R-22345

3L three-bedroom ADU with kitchen on right side. Gross area shown in the package: 962.40 sf. Net indoor area shown: 931.63 sf.

Open PDF

R-22348

1L one-bedroom ADU with kitchen on left side. The PDF includes plumbing, electrical, equipment, and architectural package material.

Open PDF

Official California context

California HCD maintains the ADU Handbook and updated it in March 2026, including an addendum for changes effective January 1, 2026. The ADU Cost site links to HCD instead of rewriting legal guidance as sales copy.

California HCD ADU Handbook