California has some of the most discussed rent control laws in the country — and one of the most misunderstood pieces of legislation shaping them is the Costa-Hawkins Rental Housing Act. If you've heard the term and wondered what it actually means for your rent, your lease, or your rights, here's a clear breakdown of how it all fits together.
The Costa-Hawkins Rental Housing Act is a California state law, passed in 1995, that places limits on what local governments can do with rent control ordinances. It doesn't eliminate rent control — it sets the boundaries within which cities and counties are allowed to operate.
In plain terms, Costa-Hawkins answers two critical questions for California's rental landscape:
Understanding the answers to both is the foundation for making sense of California rent control as a whole.
Costa-Hawkins requires that certain categories of housing remain exempt from local rent control ordinances, regardless of what a city might want to do. The major exemptions include:
This means that if you rent an apartment in a building constructed after 1995, local rent control almost certainly does not apply to your unit — even if you live in a city with a strong rent control ordinance.
Why does the cutoff date matter? Legislators built in the exemption to avoid discouraging new housing construction. The theory was that developers needed assurance that new buildings wouldn't face rent caps. Whether that policy goal has been achieved remains a subject of ongoing debate in California.
The second major pillar of Costa-Hawkins is a concept called vacancy decontrol (sometimes called "vacancy deregulation"). This is where many tenants are caught off guard.
Vacancy decontrol means that when a rent-controlled unit becomes vacant — when a tenant moves out voluntarily or is evicted for cause — the landlord can reset the rent to market rate for the next tenant.
So while a long-term tenant in a rent-controlled unit may be paying significantly below current market rates, the moment that tenant leaves, the landlord can typically charge the incoming tenant whatever the market will bear. The new tenant then may have their own rent stabilized going forward, but at that higher starting point.
This is why staying in a rent-controlled unit can have significant financial value for long-term tenants. Moving — even voluntarily — can mean losing access to well-below-market rent permanently, since the unit's rent will reset when vacated.
In 2019, California passed AB 1482, also known as the Tenant Protection Act of 2019. This created a statewide rent cap that operates alongside — and sometimes independently of — local rent control ordinances.
Here's how the two layers interact:
| Layer | Law | What It Does |
|---|---|---|
| Statewide baseline | AB 1482 (2019) | Caps annual rent increases at a formula tied to inflation (CPI) plus a fixed percentage, with an overall ceiling |
| Local rent control | City/county ordinances | May offer stronger protections in some cities; must comply with Costa-Hawkins |
AB 1482 does not override Costa-Hawkins. It carries its own exemptions that closely mirror Costa-Hawkins — single-family homes (with notice requirements), condos, and buildings built within the last 15 years are generally excluded from the statewide cap as well.
The practical result: some tenants have both local and statewide protections, some have only one layer, and some have neither. Which category applies depends heavily on your city, your building's age, and your property type.
Dozens of California cities have their own rent control ordinances — including Los Angeles, San Francisco, Oakland, Berkeley, San Jose, and Santa Monica, among others. These local laws can be more protective than the statewide baseline, but only within the limits Costa-Hawkins allows.
For example, a city's rent control ordinance might:
But that same ordinance cannot legally extend rent control to single-family homes, condos, or post-1995 buildings — because Costa-Hawkins prohibits it.
🗺️ If you live in a city with local rent control, the specific rules, covered buildings, and allowable increases are set at the local level. What applies in Los Angeles may differ meaningfully from what applies in Oakland or San Jose.
Whether rent control applies to your situation depends on several intersecting factors:
These variables interact, which is why the same general rule can produce very different outcomes for two tenants living a few blocks apart.
Costa-Hawkins has been a target of repeated repeal or reform efforts. California voters have considered ballot measures to expand local rent control authority — most notably Proposition 10 in 2018 and Proposition 21 in 2020 — and rejected both. Advocates for repeal argue that Costa-Hawkins restricts housing affordability tools; opponents argue that loosening it would reduce housing supply over time.
The law remains in effect as of this writing, but California's rental housing policy is an active area of legislation and ballot initiative activity. Changes at the state level could alter this landscape, which is why staying informed — and consulting local tenant resource organizations — matters for anyone navigating these rules.
If you're trying to figure out whether rent control protections apply to you, the questions worth investigating include:
Local tenant rights organizations, legal aid societies, and city rent boards can help you assess which specific rules apply to your unit. The framework above tells you what the landscape looks like — your specific address, building, and lease tell you where you actually stand within it.
