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Build an ADU, rent it out, make passive income. That’s the pitch you’ll hear at almost every backyard cottage seminar or ADU financing webinar. What those events tend to gloss over is the part that comes after the permit gets approved — specifically, who controls what you can charge for rent and how much you’re legally allowed to raise it.

California’s AB 1482, the Tenant Protection Act of 2019, created a statewide rent control framework for the first time. Whether your ADU falls under it — or squeaks by on an exemption — depends on a set of factors that are more nuanced than most online summaries let on.

This piece lays out what the law actually says, where local rules change the picture, and what you need to have locked in before your first tenant moves in.

What AB 1482 Actually Does

The law runs on two rails. First, a rent cap: for units it covers, annual increases are capped at 5% plus the regional Consumer Price Index, with a hard ceiling of 10% no matter how hot inflation runs. Second, just-cause eviction: once a tenant has lived in a covered unit for 12 months, you need a legally recognized reason to end the tenancy.

That second piece catches people off guard more than the first. It’s not just about rent  it’s about your ability to reclaim your own property.

Which Units Does It Cover?

Here’s where ADU owners often get the wrong answer from a quick Google search. AB 1482 is not a blanket law. It includes meaningful exemptions:

•         New construction exemption: Any unit that received its certificate of occupancy within the past 15 years is automatically exempt. The window rolls forward every year.

•         Single-family exemption: Single-family homes and condos owned by individuals (not corporations, REITs, or LLCs with corporate members) can be exempt — but only if the landlord gives written notice to the tenant using exact statutory language.

•         Owner-move-in and relative exemptions: Certain scenarios allow termination of tenancy for personal use, though these carry strict procedural requirements.

An ADU built in 2021 on a single-family parcel, owned by an individual, will likely clear both the new construction and the single-family bar simultaneously. That’s a clean outcome. The messier cases are older units and properties with complex ownership structures.

The 15-Year Clock: More Important Than People Realize

The new construction exemption is the workhorse of ADU rent control compliance in California. But it’s not permanent, and a lot of homeowners treat it as if it is.

If your ADU was issued a certificate of occupancy in 2010, it lost that exemption in 2025. At that point, you need to fall back on the single-family exemption  and if that doesn’t apply (say, because you’ve since transferred the property into an LLC), AB 1482 applies fully.

The practical move is to calendar the exemption expiration date at the time of occupancy and revisit your ownership structure and lease terms before that date arrives. Most homeowners don’t do this.

Local Ordinances: The Layer That Overrides Everything

This is the part that surprises people most. AB 1482 does not preempt stricter local rules. Cities with rent stabilization ordinances that existed before January 1, 2020 kept full authority to enforce them. In practice, that means several California cities operate under frameworks that are considerably tighter than the state baseline:

•         Los Angeles (RSO): Covers units built before October 1, 1978. Newer ADUs are generally outside the RSO’s reach, but the parcel’s RSO status can affect how certain compliance obligations are calculated.

•         San Francisco: Rent control for units built before June 13, 1979, plus a just-cause eviction ordinance that’s more expansive than anything AB 1482 requires.

•         Oakland: Units built before January 1, 1983 are covered. Oakland also enforces one of the broadest just-cause frameworks in California.

•         Santa Monica: Strict rent stabilization for pre-1979 units, with additional rules for new construction on controlled parcels that can catch ADU owners off guard.

Even outside these cities, it’s worth checking municipal code. Several smaller jurisdictions have added tenant protections in recent years that fly under the radar until there’s a dispute.

What the Exemption Notice Actually Requires

Claiming the single-family exemption under AB 1482 is not passive. Civil Code §1946.2(e) requires landlords to give tenants written notice using specific statutory language — and getting that language wrong, or omitting the notice entirely, can void the exemption retroactively.

That’s not a hypothetical risk. It’s the kind of technicality that shows up in unlawful detainer proceedings when a tenant challenges an eviction, or in rent board disputes when a tenant alleges unpermitted increases.

For homeowners who want the full statutory language, a side-by-side breakdown of local ordinances by city, and guidance on how ownership structure affects exemption eligibility, the detailed analysis at adu rent control is worth reviewing before you finalize any lease. It covers the AB 1482 notice requirements in full and walks through how the 15-year window interacts with local rules in plain terms.

JADUs Play by Slightly Different Rules

Junior ADUs — units under 500 square feet created from within the existing footprint of a single-family home — share the AB 1482 framework with standard ADUs. The meaningful difference is that California’s JADU statute requires the property owner to live on-site as a condition of the permit.

That owner-occupancy requirement matters because local ordinances frequently treat owner-occupied properties more favorably — and it reinforces the single-family exemption under AB 1482. If you’re building a JADU specifically as a rental, the assumption that you’ll always qualify for owner-occupancy protections is worth stress-testing with your local housing department before you build.

Costa-Hawkins: The Older Law Underneath All of This

AB 1482 didn’t emerge in a vacuum. The Costa-Hawkins Rental Housing Act of 1995 set the limits on how far local rent control could reach — prohibiting cities from applying rent stabilization to single-family homes and to units built after February 1, 1995.

AB 1482 layers on top of Costa-Hawkins rather than replacing it. Efforts to repeal or gut Costa-Hawkins  Proposition 10 in 2018, Proposition 21 in 2020 — have failed at the ballot box, but the legislative appetite hasn’t gone away. Any significant change to Costa-Hawkins would reshape the ADU rent control landscape almost immediately.

Before You Sign a Lease: A Short Checklist

1.       Pull your ADU’s certificate of occupancy date and calculate when the 15-year new construction exemption expires.

2.      Look up your city or county’s rent stabilization ordinance independently of AB 1482  they are separate questions.

3.      If claiming the single-family exemption, include the exact statutory notice language from Civil Code §1946.2(e) in the lease.

4.      Confirm your ownership structure. If the property is held in an LLC with a corporate member, the single-family exemption likely does not apply.

5.      Get a landlord-tenant attorney to review your lease before the first tenancy, especially in cities with active local ordinances.

People Also Ask

Is an ADU automatically exempt from rent control in California?

Not automatically. The new construction exemption covers ADUs issued a certificate of occupancy within the past 15 years, and the single-family exemption can cover other ADUs on individually-owned parcels. But both exemptions have conditions. An ADU older than 15 years, on a property owned by a corporation, or in a city with a stricter local ordinance may be fully subject to rent control.

How much can I raise rent on my ADU each year in California?

If your ADU is covered by AB 1482, the cap is 5% plus the regional CPI figure for that year, with a hard maximum of 10% annually. If your ADU qualifies for an exemption, there is no state-mandated cap — though local ordinances in some cities impose their own limits regardless of the state law.

Does AB 1482 apply in cities that already have rent control?

AB 1482 established a statewide floor. Cities with pre-existing rent stabilization ordinances — like Los Angeles, San Francisco, Oakland, and Santa Monica — kept their local rules, which are often stricter than what AB 1482 requires. In those cities, landlords need to comply with both frameworks, defaulting to whichever provides greater protection to the tenant.

What happens if I forget to include the AB 1482 exemption notice in my lease?

Missing the statutory notice can void the exemption. This means a tenant could challenge rent increases above the AB 1482 cap, or contest an eviction that would otherwise qualify under a just-cause exemption. The notice must use the language specified in Civil Code §1946.2(e) and should be included in the original lease — not added as an afterthought mid-tenancy.

Do the same rent control rules apply to JADUs and standard ADUs?

AB 1482 applies the same framework to both. The practical difference is that JADU permits require owner-occupancy of the property, which tends to make it easier to qualify for the single-family exemption and for certain local ordinance carve-outs. Standard ADUs do not carry that occupancy requirement, so the exemption analysis depends more heavily on ownership structure and unit age.