Beyond the Headlines: The Real Economics of ADU Development in California

Written by:

Steve Marcinuk

Date:

02 Sep 2025

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The accessory dwelling unit market in California has attracted significant attention, but much of the coverage focuses on claims about cheap, quick solutions. Jon Grishpul, Co-CEO of Maxable, has spent years helping homeowners navigate the reality of ADU development, and his perspective reveals a market far more complex than the headlines suggest.

Grishpul’s journey into the ADU space began somewhat accidentally. In 2019, he co-founded GreatBuildz, a contractor matching service designed to help homeowners find reliable professionals for renovation projects. As the company began creating educational content to attract customers, they noticed ADUs were becoming increasingly prominent in California’s regulatory landscape.

“We started writing blogs about how to find a contractor for a kitchen remodel, how much a bathroom remodel costs, what questions to ask during a site visit,” Grishpul explains. “It just so happened that right around the time we started our business, ADUs started to become more prominent and legalized here in California.”

The timing proved fortunate. Within six to twelve months, half of GreatBuildz‘s business was ADU-related, leading to a partnership and eventual acquisition of Maxable, an established ADU education platform based in San Diego.

Dispelling the $15,000 Myth

One of Grishpul’s primary missions is combating widespread misinformation about ADU costs and complexity. The market is filled with headlines promising $10,000 to $15,000 solutions, often featuring prefabricated units sold through major retailers.

“If it sounds too good to be true, it probably is,” Grishpul states firmly. “What people don’t understand is an ADU isn’t just like a little shed in your backyard. An ADU is a home. It has an HVAC system, a kitchen, a bathroom, sewage, plumbing, electric, insulation, windows, doors, foundation, footings, everything that goes into building a 4,000 square foot home compressed into a 400 to 1,200 square foot space.”

The reality check extends beyond just materials and systems. Grishpul points to regulatory compliance as a critical factor often overlooked in bargain solutions: “Every state has their own local requirements, and every city has their local requirements as well. You really need to make sure that plan is in compliance with state, county, and city guidelines.”

The ADU Gold Rush Problem

The surge in ADU interest has created what Grishpul calls an “ADU Gold Rush,” attracting contractors without proper experience or realistic pricing models.

“Everyone who’s hearing about it, who knows how to swing a hammer or might think they know how to swing a hammer, says ‘I could do that. That’s easy. I’ve been remodeling bathrooms for years,'” Grishpul observes. “They severely underbid the project, whether to scam homeowners or due to lack of experience. They sell a job for a certain price, but halfway through they realize they’ve run out of money.”

The solution, according to Grishpul, lies in thorough contractor vetting. His advice: ensure contractors have specific ADU experience, not just general construction credentials. “There are contractors who have glowing reviews about all the kitchens they’ve done, but if there are zero reviews about the ADUs they’ve built, I wouldn’t want to hire that guy for an ADU.”

Evolving Customer Demographics

The ADU customer base has changed significantly since the early days of California’s regulatory changes. Initially dominated by investors seeking rental income, the market now encompasses a much broader range of use cases.

“In the very early days, it was primarily investors or people looking for rental revenue,” Grishpul notes. “Now 80 to 90% of investors definitely know the value an ADU provides for properties. Pretty much every single investor I talk to says, ‘I have rental properties. This is already enough of a proven model. Now I want to do ADUs on all of my properties.'”

Beyond investors, Grishpul identifies several emerging demographic trends. Multi-generational living arrangements are increasingly common, driven by both economic necessity and cultural preferences. “Boomerang kids,” college graduates returning home, represent a significant market segment, as do families caring for aging parents who want independence without the cost of senior living facilities.

“We’ve seen people bringing in their grandparents, their aunts and uncles,” Grishpul explains. “It’s a style of living that is an old concept, and it’s exciting to see how this is starting to come back.”

Creative Applications Beyond Housing

The pandemic increased interest in ADUs for non-traditional residential uses. Home offices became particularly popular as remote work normalized, but Grishpul has observed even more creative applications.

“We’ve helped business owners with psychology practices or kinesiology backgrounds, taking personal training clients, converting their garages into ADU gym spaces,” he says. “During COVID, we saw a lot of home office ADUs because you can use your home office if you have one, but you’re still in the home with crying babies and yelling kids and dogs.”

One particularly innovative trend involves older homeowners downsizing within their own properties. “When older parents’ kids leave the house, many stay in homes that are 1,500 to 2,000 square feet with just two people,” Grishpul explains. “I’m seeing a lot of those older couples build an ADU, move into the ADU, and rent out the main house to cover their entire mortgage and loan payments for the ADU.”

Market Intelligence and Growth Indicators

Grishpul tracks several metrics to gauge market health and growth potential. Regulatory changes at both state and local levels provide one indicator, as does web traffic and engagement with educational content.

“I operate two websites, and our YouTube channel is all SEO-driven. I see the stats, I see traffic going up on all my ADU-related articles,” he reports. “At Maxable, we have a monthly webinar covering different topics about how to design, find a contractor, save money on your ADU. Every month, our numbers are growing.”

The educational component reveals an important market dynamic: despite years of media coverage, many homeowners are still discovering ADUs as an option. “I’d be lying if I didn’t say that three years ago, I thought everyone knew about ADUs because I knew everything about ADUs, but clearly people are still just hearing about them.”

Financing and Appraisal Evolution

The financing landscape for ADUs has matured as lenders and appraisers develop better understanding of these projects’ value proposition. Early challenges centered on appraisers’ uncertainty about how ADUs impact property values.

“When they first started, lenders didn’t really know the value of these things, and therefore appraisers weren’t exactly sure how much value they add to a property,” Grishpul explains. “But certainly, as time has gone on, as the industry has developed more understanding and track record, that’s improved significantly.”

Technology Solutions for Consumer Protection

Recognizing the persistent challenge of contractor evaluation, Grishpul has developed an AI-powered tool called BidCompare AI, currently in beta testing. The platform allows homeowners to upload up to four contractor estimates and receive detailed comparisons and analysis within minutes.

“One of the hardest things for the average homeowner is finding a good contractor, and part of that is evaluating estimates,” Grishpul explains. “How do I know I’m getting a fair price? That these three bids are equivalent?”

The tool generates both a line-by-line comparison spreadsheet and a detailed analysis with follow-up questions homeowners can ask contractors about discrepancies or missing items.

Looking Forward

As California’s ADU market matures, Grishpul sees continued growth driven by housing affordability challenges and changing family structures. However, he emphasizes that success requires realistic expectations and proper professional guidance.

“You’re building a full-size home, even if it’s tiny. There are no shortcuts,” he concludes. “Finding a reliable team and building the right team is the most important step in the process.”

For real estate professionals and homeowners considering ADU development, Grishpul’s message is clear: the opportunity is real, but so are the complexities. Success requires moving beyond the headlines to understand the true economics and requirements of creating additional housing in California’s evolving regulatory environment.