The Developer Fighting to Make ADUs Affordable
How Revival Homes is rethinking design, sourcing and process to make ADUs more affordable and accessible
Anthony Dedousis didn’t start out in housing. After a long career in tech and finance, he found himself a self made housing advocate, obsessing over policy reform. After years fighting from the outside, he decided to take matters into his own hands. The charming CEO founded Revival Homes, an accessory dwelling unit (ADU) developer in Southern California, to help homeowners navigate the thorny process of building them.
Why ADUs Matter
Roughly 90% of buildings in the U.S. are single-family homes, as Brian Potter points out.1 To increase density in these vast, low-density areas, many states have legalized ADUs, which are smaller, secondary homes built on single-family lots. While they won’t solve the housing crisis on their own, they’re one way to make a dent.
Anthony explains their importance:
For decades, California (and most states and cities) have made it far too difficult to build more housing, especially apartments in our most high productivity, high demand neighborhoods. In the city of LA where I live, on three quarters of the land that's zoned for housing, it is illegal to build anything other than a single family house. No apartments, no town homes, no courtyard bungalows, no nothing except for houses, which are the most expensive form of housing there is…. [In 2016] California passed a series of laws that make it a little easier and more consistent across cities to get a permit to build an ADU. Essentially, if you follow the rules the state lays out, you get your permit. And so this is a small but important and necessary step towards fixing California's housing shortage and affordability crisis, which are two sides of the same coin.
Importantly, this strategy is working! Last year, one in every five new homes built in California was an ADU.2 Critics argue that ADUs don’t add “enough” density compared to large multifamily projects. But that misses the point. ADUs flip the script on who gets to be a developer. They don’t require institutional capital, political connections, or millions in debt. They let everyday homeowners add supply one unit at a time. Each one may be modest, but together they represent hundreds of thousands of new homes—and every unit helps chip away at the housing shortage.
How Revival Builds ADUs
Building an ADU is incredibly complex, especially for a homeowner with little understanding of how a construction project is managed. They have to find an architect, a contractor, financing and manage the entire process themselves. Getting answers about what’s feasible to build, what a design could look like, and what it costs can take months. Along the way, it’s hard to know if the quotes provided are reasonable.
Revival Homes acts as a one-stop shop for ADUs, handling everything from pre-construction (developing designs and setting a budget) to permitting and construction oversight. They’ve partnered with a local banks, credit unions, and mortgage brokers to help their clients apply for financing. And they’ve built their own project management software to track each milestone, and even the materials needed, to keep projects on time and on budget.
Revival currently serves homeowners and small landlords across Southern California, with plans to expand statewide and into other ADU-friendly states. But Anthony’s next move is bolder: developing properties himself, leveraging California’s new law that allows multifamily buildings to add up to eight ADUs.
The Hidden Challenges of Building an ADU
ADUs, though small, are fully fledged homes, which can simplify some aspects of building but complicate others. Anthony shares what’s hard about them:
“The smaller size is both a blessing and a curse. You have to figure out how to fit the elements of a regular house in a space that's 30% the size. So we've gotten creative around things like bedroom layouts, how to lay out a bathroom to be maximally efficient, how to use smaller appliances, L-shaped kitchens, ways to cleverly ensure that everything that the resident is going to be looking for is part of the ADU. You can do amazing things with 380 or 400 square feet and have it just feel a lot larger than the sum of its parts. So we'll do clever things like vaulted ceilings, nine foot ceilings, even with a flat ceiling, do a lot to make it seem airier and larger. So there's a little bit of a jigsaw puzzle that we've gotten better and better at solving with the space constraints.”
Building an ADU is still fundamentally complex:
“Although it's smaller, you still have to think about every piece of the puzzle that would normally pertain to a standard size house. For example, are we upgrading the electrical panel? What are the site conditions like? Is it a flat, easy lot? Is it easy for men and machinery to access? Or are we talking about a lot that's going to need some grading? Are there drainage issues? How does the sunlight hit the windows at different times of day? Do we need to think about providing gas, or are we doing all electric? What kind of appliances are we choosing? What kind of fixtures, finishes, everything? And so, at a smaller scale, you're still fundamentally talking about building a home.”
Why ADUs Are Still So Expensive
But we still need to talk about the elephant in the room… ADUs are still quite expensive. A 400-600 sqft ADU can cost $200k - $300k to build, partly because many fixed costs — foundation, kitchen, HVAC, plumbing, architecture, permits — don’t scale down.3 Contractors also lack the volume to source materials at lower prices. An example from Anthony helps here:
“Many contractors will pay $2/sq ft for planks of luxury vinyl flooring. But if you buy from a wholesaler, there's a very good chance that that exact same piece of luxury vinyl costs $1.30, $1.40, $1.50. And if you buy direct from the manufacturer in India or Vietnam, tariffs aside, there is a good chance that that same piece of luxury vinyl will cost $1. Now, any one individual contractor is too small to buy enough materials direct from the manufacturer to get that lower cost”
How Revival Reduces Costs
Revival has implemented a playbook for reducing costs for homeowners:
Design Standardization: Projects start from one of 50+ base models, and are customized based on what the homeowner needs. For homeowners who want full customization, Revival offers that. But for landlords focused on ROI, Revival offers package options for interiors and exteriors (tiles, flooring, windows, doors). This standardization allows them to move faster and drive down material costs.
Bulk Sourcing: In keeping with design standardization, Revival plans to bulk-source materials on behalf of its contractors. By aggregating orders from its contractor network, Revival can buy high-quality finishes—flooring, tile, cabinets, windows—at wholesale or even factory-direct prices. Anthony believes the biggest savings will be on flooring tile, cabinets, countertops.
Faster Pre-Construction: Revival’s in-house software, Elevation, tracks every detail down to window sizes so projects move from concept to permits twice as fast as competitors.
Why Prefab Hasn’t Dominated ADUs
Homeowners who want to build ADUs often consider prefab options, but rarely end up there, primarily because they work well in very narrow cases.
Among the prefab options, there are very inexpensive units — tiny homes, sheds, or Boxabl style units — that are quick to install, often without foundations, and suitable in very specific cases. On the other end are high end, Scandinavian-inspired designs (like Samara or Ood House) that cost $300,000 or more for a studio. These also allow minimal customization and require ideal site-conditions, like access to a crane and no overhead obstructions. For a homeowner, neither option is usually practical.
As a result, over 90% of ADUs built in California rely on traditional stick-built construction. Stick-built ADUs are more adaptable — they fit diverse lot configurations, match the look and feel of the primary home, and allow for customization. Many homeowners opt for garage conversion ADUs, and stick-built construction lends itself well to this form factor. These advantages make stick-built units not only more cost-effective but also more contextually appropriate for neighborhoods, where aesthetics and fit matter just as much as functionality.
While prefab shines in large-scale applications such as multi-unit apartments, subsidized housing, or hotels—where repeatability and standardization drive efficiency— Dedousis emphasizes that for backyard ADUs, traditional construction remains the most practical and versatile approach.
ADUs and Housing Supply
It’s difficult to pin down exactly how many ADUs have been built nationwide, but estimates suggest around 100,000 have gone up since state-level reforms began in roughly 14 states. That number may feel small against a 5 million unit housing shortage, but again, each ADU is a step toward closing the gap.
More importantly, ADUs open the door for a new kind of development: everyday people, like Anthony, starting with one or two units, gaining experience, and eventually scaling into more. This kind of local, grassroots growth, rooted in community support and local knowledge, matters in cultivating local developers.
So to the critics of ADUs: don’t just look at where the numbers are today. Think bigger! Think about where they can take us tomorrow.
Watch our full discussion here:
https://cayimby.org/reports/california-adu-reform-a-retrospective/
https://www.cotta.ge/resources/adu-costs