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Premium Modular ADUs & Commercial Buildings in California

HCD-certified. Factory-built. Permanent real estate. Custom modular structures delivered in half the time of traditional construction.

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MODULAR CONSTRUCTION

THIS IS NOT A BOX.
THIS IS REAL ESTATE.

Every unit leaves our factory inspected and certified to code — the same buildings you’d get from traditional construction, manufactured in a controlled environment for superior quality and speed. HCD-certified in California, these are permanent structures that appreciate in value.

HCD-CERTIFIED

Factory-inspected. Built to California code. Real property.

FACTORY-BUILT

Precision manufacturing in our 40,000 sqft facility.

CUSTOMIZABLE

Steel frame or container. Any layout, any finish.

TWO WAYS TO BUILD

CHOOSE YOUR BUILD

Modern steel-frame modular ADU with gray exterior and wood entry

STEEL FRAME MODULAR

Custom-engineered steel frame modules. Any size, any layout.
Two-story shipping container home with black exterior and large windows

SHIPPING CONTAINER

Modified containers transformed into permanent structures.

TWO WAYS TO BUILD

40,000 SQ FT INDOOR.
4 ACRES OUTDOOR.

Our factory-controlled environment produces permanent, code-compliant buildings — inspected and certified before they leave our facility.

40K SQFT

Indoor

4 ACRES

Outdoor

CERTIFIED

Code-compliant

OUR PROCESS
SCHEDULE A TOUR
Modern steel-frame modular ADU with landscaped yard
White modular building on the ModCubes production floor
Black steel-frame modular unit being assembled at the factory
Steel framing assembly inside the ModCubes manufacturing facility

FAST PERMITTING

Pre-certified for quicker approvals

MODULAR DESIGN

Add modules as you grow

CODE-COMPLIANT

Meets all local building codes

50% FASTER

Than traditional construction

EXPLORE OUR MODELS

FEATURED ADU MODELS

HCD-certified modular homes — permanent real estate, factory-built for California’s housing market.

Apex III modern modular ADU with dark exterior and wood entry

APEX III

Modern ADU — 600 sqft
Peakline modular ADU with dark exterior, large windows and outdoor patio

PEAKLINE

Angular Design — 800 sqft
Crest II compact modular ADU with dark siding and large front windows

CREST II

Peaked Roof — 700 sqft
VIEW ALL MODELS

READY TO BUILD?

Talk to an engineer about your project — ADUs, commercial, or multi-family.

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CHOOSE YOUR BUILD

OUR WORK

PROJECT GALLERY

Steel-frame modular multifamily apartment building
Apex Duplex — 3-Story Multi-Unit
Apex Estate modular home with attached garage and modern wood exterior
Cargo Cube shipping container ADU with black steel exterior, wood cladding and large windows
Glass House modular ADU with floor-to-ceiling windows, wood siding and a forest setting
Cargo Cube shipping container ADU with black steel exterior, wood cladding and large windows
VIEW FULL GALLERY

FREQUENTLY ASKED QUESTIONS

MODULAR CONSTRUCTION FAQ

What is a modular ADU?
A modular ADU (Accessory Dwelling Unit) is a factory-built, self-contained living space that’s installed on your existing property. ModCubes units are HCD-certified, steel-frame structures built to California code — they’re permanent real estate that appreciates in value, not temporary structures.
ModCubes offers both steel-frame modular and shipping container builds under one roof. With 20+ years in modular construction, we handle everything from ADUs to commercial data centers, healthcare facilities, and drive-thru restaurants. Every unit is fully customizable and built in our own factory.
Yes. ModCubes can handle all permitting and site prep for you, or your contractor can manage it. Our HCD-certified units streamline the permitting process since they’re pre-inspected at the factory before delivery.
Our factory-built process dramatically reduces timelines compared to traditional construction. While site-built projects take 12-18 months, our controlled manufacturing environment delivers faster build times with superior quality control.
ModCubes is headquartered in Santa Rosa, CA and primarily serves Northern California including the Bay Area, Sacramento, Sonoma County, Napa, and Marin. We also serve Central and Southern California for larger commercial and development projects.

READY TO BUILD?

Let’s bring your modular vision to life. Start your project with a quick consultation today.

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