Who's Actually Building California's Housing Now?

I've spent fifty years in Ventura County real estate and the last forty managing rental property here. The change I want to write about didn't reach me as a policy memo. It reached me through who I'm working for.

For most of my career, a second unit meant a duplex, and a duplex meant an absentee owner. Someone bought it as an investment, lived somewhere else, and hired me because they weren't going to drive over. That was the shape of small-scale rental housing in this county.

Now I'm leasing accessory dwelling units — ADUs, the second units, converted garages, and backyard cottages that state law has progressively legalized — where the owner is standing in the driveway. Different unit, different owner, different relationship entirely. The landlord isn't an investor across town. He's the man who lives twenty feet away and financed the construction with equity in his own house.

That's not a change in volume. It's a change in who produces rental housing, and I watched it happen from the leasing desk without anyone announcing it.

The arrangement we used to have

For most of the last century, housing production was institutional work. Governments zoned and entitled it. Developers built it. Lenders financed it. Planning departments approved it. If you owned a house, you owned a house.

That's no longer the arrangement. Depending on your city, you can now add an accessory dwelling unit, or a junior accessory dwelling unit (a JADU — a unit of 500 square feet or less carved out of the existing house), or in some cases convert your single-family property into multiple units, largely by right. You design it. You finance it. You manage the construction. And when it's finished, you become a landlord — usually your own.

Read that again. We have quietly asked individual homeowners to take on a job that used to belong to institutions.

The move has a name, and we've made it before

This isn't unique to housing. It's the same structure as the shift from pensions to 401(k) plans, and from employer health coverage to high-deductible accounts. A collective production function gets converted into a private opportunity, and the transition is announced as empowerment. Nobody said "we're moving retirement risk onto you." They said "now you control your own retirement."

ADU policy speaks the same grammar. The state didn't start producing housing. It deregulated your ability to produce it.

The strongest objection, which I want to meet first

A land use professional will tell me I have the history backwards, and they're half right.

Before zoning, small-scale owner development was the American norm. Garage apartments, duplexes, boarding houses, second units over the shop — built by ordinary property owners, block by block, from the 1890s through the 1920s. It was the zoning codes of the mid-century that took that right away.

By that reading, ADU law isn't an offload. It's a restoration, and the era of institutional-only housing production is the historical anomaly.

I think that's true. And I still think something important is being missed.

What's new isn't the right. It's the absence of everything around it

A developer who takes on a project has an entity, a construction lender, a contingency budget, a general contractor under contract, insurance, and bankruptcy protection if it fails.

The homeowner California just deputized has a home equity line and a family.

The state handed out a development right and attached a set of liabilities that nobody discloses at the permit counter. I've written about one of them: building an ADU can cost you your exemption under Assembly Bill 1482, the Tenant Protection Act of 2019, before you ever rent it — and the moment it happens is the certificate of occupancy, not the day you move out.

That consequence doesn't appear on any contractor's bid. It doesn't appear on the city's ADU handout either.

We're measuring the wrong thing

The number everyone celebrates is permits issued. California added 29,710 accessory dwelling units in 2025, an increase of 11.4 percent, and they accounted for nearly 28 percent of all new single-family housing in the state.

Those are real numbers and I believe them. But a permit is not a completed unit. A completed unit is not an occupied one. An occupied unit is not necessarily long-term rental housing, and none of it is necessarily affordable.

Nobody is tracking ADU project failure rates. Nobody is tracking cost overruns, or abandoned projects, or owners who became accidental landlords and regret it. We adopted the easiest metric available and called it a result.

And not everyone was handed the same right

The right is universal. The capacity to use it is not.

Acting on it requires equity, credit, and an appetite for six figures of construction risk. Which means the policy converts a public problem into a private opportunity available mostly to people who already own appreciated property.

That is not a reason to oppose it. It is a reason to be precise about what it accomplishes, and for whom.

What I'm actually arguing

I'm not against ADUs. I manage them. I lease them. They're producing real housing for real people — particularly single-occupant households, which are the fastest-growing segment in this state as people marry later, divorce more, and age in place alone.

What I'm against is declaring a policy successful before asking harder questions about it.

Have we solved California's housing crisis? Or did we identify the one corner of it where deregulation would produce a private return, and let that corner get solved first?

In the next two parts I answer the question in the series title with arithmetic instead of argument. Part 2 runs the numbers for someone trying to buy in and do this. Part 3 runs the same numbers for someone who already owns the land.

They reach opposite conclusions. The gap between them is the whole point.