Built ADU

About
ABOUT US
The Best Pre-Fab Install Company in Southern California

There are plenty of companies that can install your pre-fab (manufactured or modular)—but only one you can truly trust. As a family-owned business with over 20 years of experience in manufactured home sales, installation, and construction, we don’t
just sell you a home—we manage the entire process from start to finish.

With multiple licenses and a fully in-house team, we’re equipped to handle every step of the journey seamlessly.

WHY CHOOSE US
Fully Licensed & Certified Professionals

We’re fully licensed in California as a B General Building and C-47 Manufactured Housing Contractor (#999468) and a licensed manufactured home dealer (#DL1255017). These credentials let us manage your project end to end — factory selection, full architectural scope, site prep, utility and foundation work, and construction inside and outside the home once it’s installed — ensuring full legal compliance and expert execution at every step.

Fully Licensed Contractors You Can Trust

With both a C-47 and a B General Building Contractor license, we're fully licensed to install your manufactured home — whether an ADU, a primary residence, or a multi-family development — once it's delivered. We don't rely on subcontractors for the critical work; our in-house team handles the installation to ensure quality, consistency, and full code compliance throughout. California Contractor License #999468 — Manufactured Home Inspection Inc. (DBA: BuiltADU).

Direct Factory Access For Better Prices

Our dealer license gives us direct access to leading manufactured home factories — Cavco, Champion, Silvercrest, Fleetwood, Clayton, Skyline, and Samara. We'll walk you through their full range of floorplans and design options, and if you're looking to save, we'll help you do it without sacrificing quality. Department of Housing Dealer License #DL1255017 — Mobile Home Agents.