Expert guidance

Bring your Inland Empire ADU vision to life with Revival Homes!

Our local ADU pros and efficient process can guide you from start to building permit in as little as three months!

We're experts in Inland Empire ADU Planning & Development

Managing an ADU project in the Inland Empire — from planning and financing to design, permitting, and construction — can feel like a full-time job. Without the right team of experts, your project can stall with expensive delays and mistakes. When you choose Revival Homes, you partner with a team of experienced homebuilders who know the Inland Empire’s ADU permitting process like the backs of their hands. Our one-stop shop combines transparent pricing, customized designs, expedited permitting, affordable financing, and top contractors — which means a faster, smoother path to your Inland Empire ADU. With Revival Homes, you’ll start building your ADU twice as fast. Our team develops ADUs in:

Chino Hills

Claremont

Corona

Eastvale

Fontana

Jurupa Valley

Montclair

Moreno Valley

Ontario

Rancho Cucamonga

Riverside

San Bernardino

Upland

And everywhere in the Inland Empire!

FAQ

Frequently Asked Questions about Building an ADU in Inland Empire

How long does it take to permit and build an ADU in the Inland Empire?

Building an ADU is not an overnight process — planning, permitting, and construction each take time. We advise our clients to budget roughly one year from start to finish — however, some projects can reach completion in as little as eight months! Here are the major project milestones (which you can view in more detail HERE)

  • Project Planning (1 month): If you are starting from scratch, we’ll meet with you and help you quickly develop a custom project scope, floor plan, and construction estimates from three of our trusted partner builders. By the end of this stage, you’ll have a clear sense of what you can build, what it will look like, and how much it will cost. 
  • Design (1-1.5 months): With a project scope finalized, we’ll create a full set of architectural and engineering plans (a “plan set”), which we then submit to the city for approval. Along the way, we share your plans with our partner builders to assure that your project design remains on budget. 
  • Permitting (2-2.5 months): Once the permit application has been submitted, your city or county’s building department reviews the plans and requests any necessary revisions. Other city agencies, like the department of engineering or your electric utility, may also need to review and approve the plans. We coordinate this process with our architect and engineer to make all required revisions to the plans and get your permit approved as swiftly as possible. We have more details on the permitting process here.‍
  • Construction (4-8 months): Once your building permit is approved, construction can begin! If you’ve selected a Revival Partner Contractor, they’ll plan accordingly to mobilize as this milestone approaches to capture valuable time. Revival works with our partner contractors to oversee the construction process, which includes site prep, building the foundation, erecting walls and a roof, installing plumbing, electrical, and HVAC, putting in insulation and drywall, and installing finishes and fixtures. Finally, the city will inspect the ADU and issue a certificate of occupancy, which means that the ADU is ready to be lived in! Overall, construction duration depends upon the size of your project, complexity of the build, and time of year. 
How much does it cost to build an ADU in the Inland Empire?

The cost of building an ADU varies and depends on many project-specific characteristics. The construction costs for our projects have ranged from $100,000 (a 400 square foot garage conversion) to $300,000 (a 1,200 sqft ADU with 3 bedrooms and 2 baths). The cost of construction depends on factors like:

  • Size of the ADU
  • 1 or 2 story ADU
  • New construction or conversion of existing space
  • Level of fixtures, finishes and appliances
  • Unique architectural details (vaulted ceilings, custom windows, etc)
  • Quality of access to the construction location
  • Existing utility capacity - whether the existing panel and sewer connection require upgrades
  • Whether you’re building on flat or sloped ground
  • Whether demolition and removal of existing structures or hardscape is required

When you book a free consultation with a Revival Homes ADU expert, we’ll provide a preliminary project cost estimated based upon our first conversation. When you proceed with our Project Planning Package, we’ll provide you with a clear and accurate budget based upon your custom project scope and construction estimates from three of our partner ADU builders.

Are ADU grants available in the Inland Empire?

At one time, the California Housing Finance Agency (CalHFA) offered an ADU Grant Program. The program reimbursed eligible homeowners up to $40,000 in pre-construction expenses that they'd already incurred on their ADU project. This typically included the cost of architectural designs and permitting fees, not actual construction.

Unfortunately, the grant program is no longer active — all of the funding was fully allocated in 2023. We're actively monitoring the program in case the state provides future funding to the ADU Grant Program.

Some cities and counties offer ADU funding resources through local programs. We recommend inquiring with your local Planning Department.

How many ADUs can I build on my property in the Inland Empire?

The number of ADUs that you can build on your property depends on whether it is a single or multi-family property:

  • Single-family: One full ADU (attached or detached) and one junior ADU (conversion of existing space). Some cities allow more than one full ADU at a one-family house under certain conditions.
  • Multi-family: As of 2025, you can build up to the same number of detached ADUs as the number of existing units (up to 8). You can do so in open space or “non-livable space”, like a laundry room, garage, or carport. 

Our experts can help you verify the number of ADUs that you may build at your property, and recommend different approaches to maximizing the ADU potential of your property!

Does Revival Homes provide site visits in the Inland Empire?

Yes! Revival Homes provides an in-person site meeting with one of our ADU experts as part of our $299 Project Planning Package. We’ll meet with you to survey your property and discuss your project vision, which we’ll then quickly translate into a customized project scope, design, and construction cost estimates from our partner ADU contractors. 

Am I allowed to rent out my ADU in the Inland Empire?

This depends on your city’s local regulations of short-term rentals. Many cities in California strictly limit your ability to rent an ADU on a short-term (less than 30 days) basis. We recommend that you research your city’s short-term rental regulations during your initial project planning. Our blog post here has additional information.

Get Started Today with our ADU Planning Package

We’ll meet with you and help you quickly develop a custom project vision and accurate budget.

Plan your project image

1. Site Meeting

We’ll meet with you to survey your property and discuss your ADU vision, which we’ll then quickly translate into a customized project scope.
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2. Customized Design & Project Scope 

Starting from our library of 50+ ADU models, we’ll tailor a unique and stylish set of floor plans and 3D renderings that optimize your property’s features and your budget.
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3. Accurate Construction Budget

We’ll share your project with 3 of our trusted, local partner ADU builders to provide accurate preliminary construction estimates — so you know what your project will cost before you start.
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Our Pre-Construction Process

We'll turn your ADU vision into a permitted, ready-to-build project in as little as 3 months!

1. Quality Architecture & Engineering

Our architectural and engineering teams bring decades of ADU design experience and deliver beautiful, cost-effective designs to meet your vision and budget.
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2. Expedited Permitting

We leverage our ADU law expertise, automated application management, and proactive communication with building departments to get your plans approved twice as fast as competitors.
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3. Multiple Financing Options

Whether you’re considering conventional or ADU-specific financing, we’ll connect you with our trusted partner lenders to help you find the loan product that best meets your needs.
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Ready to get started?

Speak to one of our ADU experts today!