Builder of ADUs Crafted with Precision & Care
California Modulars is a licensed manufacturer and general contractor in the State of California, specializing in custom modular structures. Entrust us as your builder/partner for your upcoming project!
Accessory Dwelling Units (ADUs) dominate California’s landscape. With increased demand for housing, they have become the most versatile and in‑demand housing solutions. If you are looking for smart ADUs to generate rental income or meet the growing needs of your family, you won’t have to look beyond California Modulars. We bring you modular ADUs that are smart, eco-friendly, affordable, and that significantly shorten construction timelines.
We have earned our place as one of the leading ADU builders in California thanks to our craftsmanship, efficiency, and modern design solutions that match contemporary needs. As part of our initiative to build modern homes, we ensure your homes are functional, stylish, and built to last. Whether you’re looking for a standard ADU within a small budget or wish to explore premium ADU models, we have something for every budget and need. We deliver spaces crafted with precision that not only meet but exceed your needs.
Smart Homes from California's Top ADU Builders
Modular ADUs have become the favorite with California residents. It isn’t surprising for a state that has been at the forefront of innovation. Modular construction is the perfect merger between architectural finesse and technology that traditional home construction methods can’t match. California Modulars, we take pride in delivering smart modular ADUs, and here’s why you must choose one.
Fast & Efficient Construction
We build our modular ADUs in a controlled factory environment, allowing us to complete most of the work off‑site. It is a fast and proven model that reduces on-site construction logistics costs, eliminates weather delays, and doesn’t disrupt your property. All these significantly reduce construction timelines.
Unmatched Craftsmanship
Choosing Modular ADUs does not compromise craftsmanship. Our design team applies the latest design principles to deliver a modern, functional home. From structural integrity to fire safety, we ensure your unit meets California’s strict building and energy standards.
Flexible Designs
ADUs present unlimited possibilities with customization. Whether you need a rental unit, guest house, home office, or living space for a multi-generational family, our ADUs meet all your lifestyle needs. Choose from thoughtfully planned standard ADUs or create the dream space you’ve always wanted.
Sustainable Homes
Modular construction reduces waste by optimizing material use. By choosing modular ADUs, you will support eco‑friendly building practices and reduce your environmental footprint. Our homes use natural light and feature high-quality insulation, helping reduce your utility bills.
Master ADU Builders
California Modulars is a certified State of California Housing & Community Development (HCD) manufacturer, offering the highest quality in modular homes. We are also a company operate as a licensed general contractor.
It is our objective to ensure the ultimate experience in design options, project management, and turn-key solutions for our customers.
Standard ADU
Our Standard ADUs offer an easy path to adding functional living space to your property. These models feature efficient layouts, modern finishes, and all the essentials needed for comfortable living. If you are seeking a budget‑friendly, fast‑to‑build solution, these fit the bill. We are dedicated to incorporating sustainable, eco-friendly materials and construction methods, firmly believing in providing everyone with access to a healthier and higher-quality living space. All our modular structures adhere rigorously to California Title 24 and CalGreen guidelines to uphold these standards.
PREMIUM ADU MODELS
If you want more luxury, space, and customization, our Premium ADU Models let you live king-size. These models feature top-grade materials and flexible floor plans that elevate your lifestyle. Whether you want a spacious one‑bedroom suite or a multi‑room layout, our premium units offer limitless possibilities that you and your family will love.
CAL 320
Studio | 1 Bath | 320 sq.ft
CAL 400
1 Bed | 1 Bath | 400 sq.ft
CAL 480
1 Bed | 1 Bath | 480 sq.ft wtih Loft
Custom ADU
If you want more luxury, space, and customization, our Premium ADU Models let you live king-size. These models feature top-grade materials and flexible floor plans that elevate your lifestyle. Whether you want a spacious one‑bedroom suite or a multi‑room layout, our premium units offer limitless possibilities that you and your family will love.
Custom ADU
CAL 8
Our ADU Work
San Jose ADU Investment Case Study
Costs & Financing your California Modular ADU
| Item | Details |
|---|---|
| Estimated Total Cost | $216,000 |
| Financing Option | 30-year mortgage with 90% loan-to-value at a 7% interest rate |
| Monthly Mortgage Payment | $1,293 |
| Average Rent in San Jose | $1,950 – $2,350 per month for a one-bedroom apartment |
| Net Monthly Return | $657 – $1,057 (calculated as average rent minus mortgage payment) |
The California Modulars system and building process allows us to offer a wide range of standard and premium Accessory Dwelling Units which opens our clients up for a more flexible financing based on what type of ADU chosen. Although we can’t give a fixed amount, in general however the base price of each ADU design that we offer has its inclusions and exclusions outlined below
INCLUDED
- Design and Architecture Fees
- Structural, MEP & Title 24 Engineering
- Permit Processing
- Project Management
EXCLUDED
- Financing
- Soils Engineering
- Landscaping Design
- Fire Sprinklers
- Survey
How It Works
01
Consultation
Our process begins with a scheduled phone conversation with our team. We discuss your goals and vision for the home, the site, your budget, and timelines.
(30-45 minutes)
02
Site Evaluation
The next step will be to evaluate your site and get a clear understanding of the unique qualities of your property to include general access, utility locations and overall site development needs.
(1-2 hours)
03
Design & Engineering
Following our site evaluation, we will execute a pre-construction agreement with you that includes a complete set of architectural drawings, HCD approved construction documents and submittal to the local building department for approval.
(2-6 weeks)
04
Permitting
Our design and engineering team will work with the local agencies to obtain all of the necessary permits and approvals to fully complete your project. Once received, we are ready to move on to construction and fabrication.
(4-8 weeks)
05
Construction & Fabrication
A dedicated project manager will oversee the factory construction and site development so all aspects of the project flow seamlessly. Fabrication and site work will take place concurrently, saving significant time and money.
(8-16 weeks)
06
Delivery
Upon completion of all manufacturing and site improvements, your home/ADU will be delivered by truck and set by crane or other means, directly onto the foundation.
(4-6 weeks)
What Our Client Say
Michael Roberts
Modern Villa Project
The team’s expertise in modern
architecture and sustainable building practices made our home both beautiful and efficient.
Emily Chen
Renovation Project
They transformed our outdated house into a modern masterpiece while keeping the project within budget and on schedule.
David Wilson
Custom Home Build
From the initial design consultation to the final walkthrough, their professionalism and dedication to quality was evident.
Want To Add A Smart ADU To Your Property?
Let’s deliver you an ideal ADU at a speed you can’t imagine, and at prices you can’t believe. Call us now and talk to our specialists.
Frequently Asked Questions
What are ADUs meant for?
ADUs are generally secondary housing units built on the same property as a primary residence. You can use them for rentals, hosting your guests, or adding living space for your big family.
How long does it take for California Modulars to build a modular ADU?
We can deliver modular ADUs in as few as 6 months for our Standard ADUs, while custom and premium ADUs may take a little more. These timelines are much faster than traditional builds.
Can I customize my ADU?
Yes, you can opt for our custom ADUs, where our team sits down with you and delivers a home that matches your design preferences and functional needs.
Are modular ADUs durable?
Yes, our ADUs are engineered to meet California’s building, safety, and energy codes. Made from high-quality materials, they are as strong as your traditional homes.