US Modular

US Modular, Inc. is a Southern California prefab home builder based in Calimesa, specializing in accessory dwelling units (ADUs), manufactured single-family homes, MH Advantage homes, and duplexes across Riverside, San Bernardino, Orange, Los Angeles, and San Diego counties. With more than 60 years of combined industry experience, the company offers comprehensive end-to-end services including design, permitting, site preparation, factory fabrication, installation, and utility connections. All homes are constructed to federal HUD code using materials consistent with site-built standards and are built on permanent foundations that qualify for conventional financing. The entire process from project initiation to move-in typically takes six to nine months, with factory construction and installation completing in roughly three months after permitting. US Modular operates as a full-service general contractor, handling all project phases rather than functioning as a retail lot.