
Benefits of Choosing USModular to Build Your ADU in Riverside County
Building a prefab ADU in Riverside County offers numerous advantages, especially when working with a specialist like USModular. We bring a blend of expertise, compliance with modern regulations and a diverse range of options to the table, ensuring a smooth and satisfying construction experience. Here are some of the key benefits of putting us on the job.
- Expertise in ADU Construction: Specializing in Riverside County accessory dwelling units across California, USModular brings a wealth of knowledge and experience. Our thorough understanding of local building requirements and landscape ensures that every ADU project we undertake is completed with precision and tailored to meet specific client needs.
- Senate Bill 1069 Compliant: USModular aligns its building practices with the latest regulations, including Senate Bill 1069. This compliance guarantees legal and efficient ADU construction, providing peace of mind that your project meets all necessary legal standards.
- Diverse ADU Options: Catering to various needs and preferences, USModular offers a range of ADU solutions, from garage conversions to standalone units. This diversity allows homeowners to choose an option that fits their property and lifestyle best.
- Comprehensive Services: From feasibility studies to construction and final inspections, USModular’s end-to-end service package covers every aspect of the ADU development process. This comprehensive approach simplifies the process for homeowners, making it easier to transform their vision into reality.
What USModular Does for You
- Feasibility Study and Conceptual Budget: USModular conducts a thorough analysis of zoning, utilities and building department regulations. We create a site plan and provide a budget estimation, whether it’s for garage conversions or new construction of an ADU in Riverside County, ensuring that your project aligns with your expectations and requirements.
- Phase 2 – ADU Construction: Clients can select from pre-designed or custom ADU plans. USModular coordinates the entire process, including engineering plans, building approvals and inspections, ensuring seamless execution. Our comprehensive construction services cover everything from laying the foundation to obtaining occupancy certification, ensuring a hassle-free journey to your new ADU.
Explore several options for financing your ADU project.

Riverside County Accessory Dwelling Units at a Glance
- Size Limitations: Maximum of 1,200 sq. ft. for ADUs.
- Construction Options: Modular, site-built or manufactured homes.
- Reduced Requirements: Lowered parking and utility connection fees.
- Local Zoning Compliance: Must adhere to Floor Area and SetBacks regulations.
- Fire Safety: Sprinklers may be waived if the principal dwelling isn’t equipped with them.
- Second Unit: Riverside County also allows a Second Unit (SU) with a bigger floor area than an ADU.
Choose Your Riverside County ADU
ADU Models 400 SF to 750 SF
- 1 Bedroom 1 Bath
- 2 Bedroom 1 Bath
- 2 Bedroom 2 Bath
ADU Models 751 SF to 950 SF
- 1 Bedroom 1 Bath
- 2 Bedroom 1 Bath
- 2 Bedroom 2 Bath
- 3 Bedroom 2 Bath
ADU Model 951 SF to 1,200 SF
- 2 Bedroom 1 Bath
- 2 Bedroom 2 Bath
- 3 Bedroom 2 Bath
- 4 Bedroom 2 Bath
Frequently Asked Questions About Riverside County ADU Builders
Below, we’ve addressed some of the most common inquiries to help you better understand what Riverside County ADU builders can do for you.
Are Tiny Homes Allowed in Riverside County?
Riverside County Accessory Dwelling Units (ADUs) are generally allowed, subject to specific regulations and conditions. These include adherence to local development standards, building codes and zoning laws. For instance, ADUs and tiny homes on foundations require a building permit, while those on wheels need only DMV registration. Tiny houses are often permitted as temporary structures in the backyard of an existing residence with the necessary permits. However, building a tiny house may be restricted if the land isn’t zoned for such use. Additionally, tiny houses on wheels are categorized differently and may have unique requirements. It’s essential for those interested in building tiny homes in Riverside County to stay informed about current regulations and secure the appropriate permits for legal compliance.
How Big Can an ADU Be in California?
In California, an Accessory Dwelling Unit (ADU’s) size varies based on several factors, but specific statewide regulations dictate the maximum allowable size. Every residential property in California can have one ADU of up to 800 square feet, regardless of the lot size, floor area ratio or size of the primary residence, and it can be up to 16 feet in height. However, cities must allow at least 850 square feet for one-bedroom ADUs and at least 1,000 square feet if the ADU has two or more bedrooms. Detached ADUs have a standard maximum size of 1,200 square feet in most areas, with some jurisdictions allowing larger sizes, particularly in rural locations. For attached ADUs, the size can be no larger than 50% of the square footage of the main residence, with a general guideline for detached ADUs to be anything up to the maximum size, regardless of the square footage of the main house.
How Long Does it Take to Build an ADU?
The construction time for a Riverside County ADU can vary, but USModular’s prefab process significantly speeds up the timeline. We streamline each phase, from design to installation, to deliver your ADU as efficiently as possible.
Can I Customize My ADU Design?
Absolutely! We have several customizable designs. USModular works with you to select floor plans, materials and finishes that meet your specific preferences and needs. Get inspired by viewing our ADU project gallery.
What Is the Process for Getting an ADU Approved in Riverside County?
USModular assists with the entire approval process, from initial feasibility studies and design to submitting plans and securing necessary permits, ensuring compliance with all local regulations.
Are Prefab ADUs More Affordable Than Traditional Constructions?
Generally, prefab ADUs are more cost-effective due to their efficient manufacturing and construction processes. USModular offers competitive pricing and can provide a conceptual budget early in the planning phase. If you’d prefer a single-family manufactured home, USModular can build it for you. View our single-family project gallery for ideas.
Partner With US Modular, the Riverside County ADU Builders Who Help You Grow
Constructing an ADU in Riverside County can be a transformative experience for your property, and USModular is the best partner to bring your vision to life. As trusted Riverside County ADU builders, we provide everything you need to expand your living space, from planning to construction to inspection. It’s a fast, efficient and personalized process that caters to your unique needs and preferences.
Tiny Homes in California Interior Ideabook
You’ll be amazed at how much luxury you can fit into a tiny space!
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