An ADU manufactured in a factory in modular sections, then trucked and craned onto a prepared site for assembly.
Faster install (1-3 days for craning, 4-8 weeks of finish work) and more predictable pricing than custom builds. CA-active brands include Abodu, Cover, Den, Studio Shed, Villa Homes, Plant Prefab, Connect Homes. Same state ADU laws apply (size, height, setback). Site work (foundation + utilities) typically adds $40k-$80k beyond the delivered-and-sited quote.
Part of the BackyardADU California ADU Glossary — plain-English definitions of the regulatory, construction, and financing terms you'll encounter during a California ADU project.