Factory-built homes, set on your lot
BuiltADU is the company SoCal homeowners and developers call to install manufactured and modular single-family residences.
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Installers, not a factory
The home itself is built to exacting standards inside a controlled plant, whether manufactured or modular, while our in-house team handles everything needed to turn it into a permanent home on your lot: permitting, site prep, grading, demolition, foundation, utilities, setup and installation, and all interior and exterior construction work after the home is set and secured to its permanent foundation.
Because the factory build can happen at the same time as site work, foundation work, and utility work, a prefab single-family residence can reach completion and move-in significantly faster than a comparable stick-built home. The home also arrives largely completed from the factory, reducing the amount of on-site framing, insulation, drywall, paint, and other trade work typically required in a traditional stick-built project.
Once set on a permanent foundation and recorded through HCD Form 433A, the home becomes real property and can be financed, insured, and resold like any other site-built home in Southern California.
How to choose
For a single-family residence, the best option usually comes down to story count, design goals, site conditions, and budget.
Single-story homes built to the federal HUD Code. Typically the fastest and most affordable path to a finished home.
Built to the California Building Code — the same standard as a stick-built home — allowing two-story or larger designs while still financing and appraising like site-built construction.
If your lot, views, square-footage goals, or overall design require a second story — and you have additional budget to spend — then a modular home is likely the better fit. We’ll help you determine which path makes the most sense for your lot before you spend a dollar.
Manufactured or modular? See the FAQOne licensed team, start to finish
- Direct factory access to leading manufactured-home manufacturers — Cavco, Champion, Silvercrest, Fleetwood, Clayton, and Skyline — through our MH dealer license, Mobile Home Agents DL1255017, opening up a wide range of floor plans and finishes.
- One licensed team managing the full scope, with no subcontractors on the critical work. BuiltADU holds both a B General Building and a C-47 Manufactured Housing Contractor license, California license #999468.
- A home recorded as real property — set on a permanent foundation, inspected on site, and recorded through HCD Form 433A — so it can be financed, resold, and taxed like a traditional stick-built home.
- A clear total project cost. For the home, installation, and related construction work, manufactured homes typically range from $250 to $325 per square foot, depending on site conditions, utility work, finishes, and overall scope.
- A faster path to move-in, since the factory build can happen at the same time as permitting and site work.
Have a lot and a plan?
Tell us where the lot is and what you want to put on it. We’ll come back with what the parcel supports, a realistic schedule, and an itemised range.
Single-family prefab questions
Yes. When a manufactured home is permanently affixed to land you own, it can generally be financed much like a site-built house. Fannie Mae’s MH Advantage program, for example, allows as little as 3% down on qualifying homes — we cover how that works in this guide.
Manufactured homes are built to the federal HUD Code; modular homes are built to the same state and local codes as a site-built house. Modular tends to be the easier path where a city or lender treats HUD-code homes differently, while manufactured is often more cost-effective. We look at your city, your lender and your lot before recommending one.
Yes. Permitting, site prep, foundation, utility connections, set and finish work are all handled by one licensed team under California contractor licence #999468. You are not coordinating a chain of separate subcontractors.
Vacant lot, aging home, or rebuilding after a loss — we manage the process from start to finish.
Tell us about your lot
We’ll map your timeline, your floorplan options, and your next steps.