Multi-Family Modular Homes | Prefab Duplexes & More | USModular

Welcome to your premier destination for Multi-family modular homes!

USModular, Inc. is a leading Southern California prefabricated construction company, specializing in high-quality multi-family homes like duplexes, plus ADUs and prefabricated single-family homes.

With hundreds of completed projects, our experienced team delivers faster timelines, superior construction quality, and predictable costs—without compromising design or durability.

We proudly serve Los Angeles County, San Diego County, Orange County, Riverside County, and San Bernardino County, helping developers, investors, and property owners unlock the full potential of their land.

Proven Experience. Trusted Team.

USModular, Inc. operates as a general contractor and home dealer, bringing together:

Prefabricated design specialists
Engineers
Trusted factory partners
On-site construction and installation teams

This integrated approach ensures every multi-family modular home project is designed specifically for prefabricated construction, avoiding the costly delays and inefficiencies that occur when site-built plans are retrofitted for prefabricated building.

California-Focused Multi-family & ADU Solutions

Recent California legislation has created significant opportunities to increase density by allowing:

Multiple ADUs
Junior ADUs (Jr. ADUs)
In-house ADUs
Multi-generational homes
Multi-family homes

USModular offers a wide range of pre-approved ADU and duplex home plans that can transform single-family properties into high-performing multi-family assets.

Our duplex designs can be built as:

Stand-alone duplexes
Single-family homes with attached ADUs

View Floor Plans

Why Build Multi-family with USModular, Inc.

Advantages of prefabricated construction with USModular’s construction experts include:

Faster permitting timelines
Significantly faster construction schedules
Consistent, factory-controlled quality
High energy efficiency
Costs typically 30–40% less than comparable site-built projects

Our streamlined modular construction process for multi-family homes reduces on-site disruption while delivering reliable results—ideal for urban and infill projects across Southern California.

High-Quality Construction Standards

USModular multi-family prefab homes include premium features such as:

2 x 6 construction
9-foot ceilings
WUI (Wildland-Urban Interface) code construction
Dual-pane, tempered glass windows
Stainless steel appliances
Quartz countertops and quality flooring
Soft-close cabinetry
Solid surface showers
High-efficiency furnaces and water heaters

Industry-Leading Factory Partnerships

USModular partners with top-tier home manufacturers, like Clayton Homes and Champion Homes. These partnerships allow us to deliver nationally proven building systems combined with local California expertise.

Industry Membership & Credibility

USModular is a proud member of the California Manufactured Housing Institute (CMHI), reinforcing our commitment to industry standards, quality construction, and regulatory Compliance.