Built ADU – Good As Built

Good as Built

Built ADU is your fast and affordable ADU Solution.

Why Built ADU?

With over 20 years of experience, Built ADU is Southern California’s trusted team for prefab ADUs and manufactured home installations—whether it’s a backyard unit or a full-size primary residence. As a licensed B & C-47 contractor, we’re the go-to partner for contractors, dealers, and homeowners who rely on us to manage the entire process—from permitting to final installation—start to finish.

We work with

Homeowners

REITS / Institutional Clients / Developers

Cities & Counties

Nonprofit Organizations (NGOs)

Discover affordable housing solutions.

At BuiltADU, we specialize in installing manufactured homes—both as primary residences and as Accessory Dwelling Units (ADUs). If you have extra space on your property and want a cost-effective way to add a private, self-contained living space, a manufactured home ADU is an ideal solution. Whether you’re creating housing for a family member or generating rental income, it’s a smart investment that also increases your property’s value.

Built to last a lifetime

Every manufactured home we deliver—whether for a primary residence or ADU—is HUD-approved at the factory and constructed to the highest standards. Once installed, it undergoes all required on-site inspections to ensure full compliance with local and state codes. With BuiltADU, you’re investing in durable, high-quality construction designed to stand the test of time

We can install the manufactured home as either a primary residence or an ADU, and have it legally registered as real property through Form 433A, once it’s placed on a permanent foundation.

Getting started

How Much Does It Cost?

The first question everyone asks: what’s the price? We provide clear, itemized estimates that outline both the cost of the manufactured home and every phase of the installation process. A solid ballpark for the combined cost of the home purchase and installation and construction work is typically $200–$300 per square foot , depending on site conditions, finishes, and project scope.
How do I get started?

We begin by understanding your goals and project needs. Whether you're looking for a licensed C-47 subcontractor or full-service turnkey support, we’ve got you covered. As a licensed B-General Contractor and C-47 Manufactured Housing Contractor , we manage the entire process—from site prep and utility hookups to final finishes. We typically visit your property within 2–3 days of your call and deliver a detailed estimate shortly after.
How long does it take?

Manufactured Home ADUs are much faster to complete than traditional builds. A typical timeline looks like this:
● Permitting: 8–20 weeks (varies by city/county)
● Factory Build & Delivery: 10–12 weeks (can run during permitting)
● Site Prep & Foundation: 2–3 weeks
● Installation & Finishes: 2–4 weeks
● Final Inspections: 1–2 weeks
Total Timeline

Most projects are completed in 4–8 months, depending on local permitting and site conditions.

Excellence in every detail

Our manufactured homes are built in third-party factories using premium materials and expert craftsmanship, all in compliance with strict HUD standards. Once delivered, BuiltADU handles the full scope of installation, construction, and finishing—using high-quality materials and skilled trades. The result is a durable, long-lasting home built to the highest standards, from the factory floor to the final walkthrough.

We don’t just install manufactured homes or build ADUs — we manage the entire process from start to finish.

From planning and permitting to delivery, installation, and final touch-ups, we take care of every detail so you don’t have to.

Project Management

One team, one point of contact. We handle plans, permits, factory coordination, and all on-site construction — keeping your project on schedule and stress-free.

All Your Docs, Handled

Escrow, warranty, inspections, and HCD documentation — we manage it all to ensure your pre-fab ADU is fully registered as real property.

Always in Your Corner

Got questions? Issues? We're here every step of the way to troubleshoot, guide, and make sure you're completely confident and satisfied.

Clear, Itemized Quotes

No vague numbers or surprise fees. You’ll get transparent, line-by-line estimates from day one — so you know exactly what you’re getting.

The Fastest ADU Possible

Factory-built in a HUD-approved facility and delivered ready to install. Less time, fewer inspections, and far less disruption to your property.

You First, Always

Call, text, email, or meet in person — however you like to communicate, we’re here to make the process smooth, responsive, and personal.