The ADU Mirage

California has spent two decades repositioning the accessory dwelling unit — the backyard cottage, the garage conversion, the basement apartment — as a cure for its housing shortage. Between 2018 and 2025 the City of Los Angeles permitted 68,832 of them. Under state law every one can count toward the city’s Regional Housing Needs Allocation, the quota that requires each California jurisdiction to plan for new homes at every income level, including the households that earn the least.

The number of those 68,832 ADUs that Los Angeles has documented as affordable to very-low- or low-income households is 20: five very-low-income units and fifteen low-income units across eight years. The remaining 68,812 are market-rate. California law lets the city count them toward its low-income targets anyway.

The figures come from the state’s own ledger. Every California city and county files an Annual Progress Report with the Department of Housing and Community Development; the report tracks permits by income category. For the very-low- and low-income categories — the ones the state’s housing law most urgently targets — Los Angeles recorded twenty ADUs with documented affordability between 2018 and 2025. The rest of the column reads above-moderate.

The permission to count market-rate ADUs as affordable did not arrive in a single statute. Assembly Bill 1866, chaptered in 2002 and effective the next year, made second units a ministerial, by-right approval and let cities count ADU sites in their housing-element inventories. It said nothing about renting those units to low-income tenants. The affordability arrives later, and from a different place: regional planning bodies assign ADUs to income categories using a default assumption, and HCD accepts it.

In the Bay Area, the Association of Bay Area Governments applies what planners call the 30/30/30/10 formula — a survey-derived split that presumes 30 percent of any jurisdiction’s ADUs rent at very-low-income rates, 30 percent at low-income, 30 percent at moderate, and 10 percent above. No deed restriction, income verification, or rent cap attaches to the assumption. The unit counts as affordable because a regional survey says units like it usually are.

A distinction does the quiet work here. A deed restriction requiring that an ADU stay a rental is not a restriction on the rent. Under California Government Code §66315 a city may not place deed restrictions on an ADU except to require that it be rented for terms of thirty days or longer — a bar on short-term rentals, not a cap on price. To count an ADU as genuinely affordable, HCD’s own rules require a recorded affordability covenant, a subsidy agreement, or actual rents on file. Twenty units in Los Angeles clear that bar. The other 68,812 are counted on the assumption.

The gap between an ADU and an affordable ADU is not a problem of political will. It is arithmetic. HUD sets the Fair Market Rent for a studio in metro Los Angeles at $1,777 a month and a one-bedroom at $2,006 — the fortieth percentile of market rents, neither luxury nor the cheapest on offer.

A one-person household in the category state law calls Very Low Income — 50 percent of area median, about $48,550 a year — can afford $1,214 a month at the standard thirty-percent threshold. The studio rent runs $563 above that ceiling; the one-bedroom, $792.

Supply makes it worse. Financing a $200,000 build over thirty years at 7 percent costs about $1,331 a month in debt service alone. Add property tax, insurance, and maintenance and a homeowner needs $1,663 to $1,996 a month just to break even. Renting to a very-low-income tenant at $1,214 would mean absorbing $450 to $780 a month, indefinitely, with no subsidy to offset it. Without a subsidy program, the state is counting the unit as though the homeowner will volunteer that loss.

Los Angeles builds ADUs at scale — 28,017 permits issued between 2021 and 2025 by the city’s own count. The construction concentrates in the working- and middle-income neighborhoods of the San Fernando Valley and South Los Angeles, not on the Westside. Reseda leads the city with 1,019 permits; Pacoima, Van Nuys, and the east Valley follow. These are renter-heavy communities with median household incomes clustered between $65,000 and $85,000 — exactly the households the RHNA is written to serve.

That geography sharpens the point. The ADUs are landing in the places where lower-income renters live. The rents they carry are set by the same arithmetic everywhere: whether a homeowner in Reseda builds for $150,000 or one in a pricier ZIP builds for more, the rent required to cover the cost sits above what a very-low-income household can pay. Proximity to the need does not close the gap.

The gap has surfaced in public meetings across the region, even where it has not produced a policy response. At the Los Angeles County Board of Supervisors on February 24, 2026, a caller used his public-comment minute, on the board’s official video, to describe what he had watched get built.

Six weeks earlier the question had been put to an elected official directly. At the Los Angeles City Council’s Housing and Homelessness Committee on December 4, 2024, during a hearing on short-term-rental rules affecting ADUs, a member of the public addressed the committee’s chair, Council Member Nithya Raman, and asked whether she rented her own ADU at an affordable rate. The commenter’s time ran out before Raman answered.

The legal point beneath the anger is the one planners rarely say out loud. At the Santa Monica Planning Commission on March 19, 2025, a commissioner pressed staff on it directly: a deed restriction that keeps a unit a rental is not a cap on the rent. Staff agreed. The two restrictions are legally separate, and a city counting deed-restricted ADUs toward its low-income targets can be conflating them. The commission’s own video records the exchange.

Mechanisms exist to produce genuinely affordable ADUs. None are free. California’s ADU Grant Program offered homeowners up to $40,000 — a grant, not a loan, reimbursing predevelopment costs such as design, permits, and impact fees — but it was keyed to the homeowner’s income, not to a promise to rent below market, and it stopped taking applications in December 2023 when its funding ran out. Against a build that costs $200,000 or more, $40,000 covers a corner of the gap even when the program is open.

A structural fix is narrower and harder. A city could count only deed-restricted-affordable ADUs — those with recorded income covenants tied to area-median-income thresholds — toward its low-income targets, and tie subsidy eligibility to long-term affordability agreements. A handful of jurisdictions have piloted exactly that. Making it the default is a state question: it would require HCD to change how it evaluates housing-element compliance, the process by which it certifies whether a city’s housing plan is legally adequate.

None of this means Los Angeles is counting homes that do not exist. The 68,832 permitted ADUs are real. People live in them. The city’s permit numbers are accurate. What the data does not capture is who those people are or what they pay — because state law does not require it, the Annual Progress Reports do not ask, and the housing-element compliance process does not verify it.

The twenty units documented as affordable are documented because someone filed the paperwork that proves it: a recorded covenant, a subsidy agreement, a deed restriction tied to income. For the other 68,812, the affordability lives in a spreadsheet column and a regional survey, and nowhere a tenant could enforce. Los Angeles is not short of ADU permits. It is short of the mechanism that would make them what the spreadsheet says they are. The full meeting record behind this article is searchable and timestamped at myhamlet.com.