Unauthorized Occupant and Unauthorized Subletter Evictions in California: Tenant Defense

Landlords routinely use “unauthorized occupant” and “unauthorized subletter” allegations to terminate tenancies. The lease says no one but the named tenants may occupy the unit. Someone else has moved in. Or the tenant is renting a room out without permission. The landlord serves a 3-Day Notice to Perform Covenant or Quit, then files unlawful detainer when nothing changes.

These cases sound straightforward and often are not. The lease provision being relied on may be waived by years of acquiescence. The occupant may qualify as an authorized guest rather than a tenant. The subletter may have been added to the household under a domestic-violence, family-care, or reasonable-accommodation framework that the law protects. In LA, the Tenant Protection Act and LARSO both impose cure-and-just-cause requirements that defeat sloppy unauthorized-occupant filings.

We represent tenants exclusively. The first question in every unauthorized-occupant case is whether the lease provision is actually enforceable as written and whether the landlord followed the required procedure before pulling the trigger on a 3-day notice.

What landlords usually allege

The textbook fact pattern: a lease names two adults, a third adult is now living in the unit, the landlord serves a 3-Day Notice to Perform Covenant or Quit demanding the unauthorized occupant leave or be added to the lease through the landlord’s screening process. A second common pattern: the tenant has been renting out a bedroom on Airbnb or to a roommate, with money changing hands, and the landlord alleges unauthorized subletting in violation of an anti-sublet clause.

For LARSO-covered units, unauthorized occupancy can fall under LAMC § 151.09(A)(2) — violation of a substantial obligation of the tenancy. For AB 1482 covered units, it falls under CC § 1946.2(b)(1)(B) — breach of a material term. In both regimes, the violation has to be substantial and material, not technical, and a cure opportunity is generally required.

The defenses that actually work

Waiver by acquiescence. If the landlord knew about the occupant or sublet arrangement for months or years and accepted rent without objection, the breach is waived. The factual showing is: who knew what, when did they know it, what did they do in response. Bank records, building manager texts, prior inspections, key fob entry logs, and emails between the tenant and management often establish acquiescence.

Guest vs. occupant distinction. A guest is not an occupant. California lease law and most LARSO and AB 1482 analyses recognize a meaningful difference between a friend or family member staying for weeks at a time and a person who has moved in. Factors include receipt of mail at the address, voter registration, driver’s license, length of stay, payment of any rent, and whether the person has another residence. A 3-Day Notice that treats a long-term guest as an unauthorized occupant is vulnerable.

Protected categories. A minor child of the named tenant is not an unauthorized occupant. A spouse or registered domestic partner added during the tenancy generally is not. A caregiver added as a reasonable accommodation under FEHA disability law is protected. A victim of domestic violence under CC § 1946.7 who has added a temporary safe occupant has statutory protection. Treating any of these as an unauthorized occupant exposes the landlord to fair-housing liability beyond the failed UD.

Defective notice. A 3-Day Notice to Perform Covenant or Quit must give a real cure opportunity. “Remove the unauthorized occupant within 3 days” is meaningfully different from “Within 3 days, either remove the unauthorized occupant or submit a written application to add them to the lease.” The former presents an impossible choice for a tenant whose roommate is family or a long-term partner, the latter respects the statutory framework. Vague allegations that don’t identify the occupant by name, or that demand cure of conduct the tenant never engaged in, fail under strict-compliance analysis.

Anti-sublet clause enforceability. A blanket “no subletting under any circumstances” clause in a rent-controlled tenancy may be unenforceable under LARSO’s anti-discrimination and tenant-protection provisions, particularly when applied to family-member roommates. Even where enforceable, the landlord usually has to give the tenant an opportunity to seek consent rather than terminating immediately on a 3-day notice.

The short-term rental wrinkle

Airbnb and similar short-term rental conduct sits in a different category. In LA City, LAMC § 12.22(A)(32) restricts short-term rentals to primary residences and requires Home Sharing registration. A tenant who has been operating an unregistered short-term rental likely cannot raise waiver or acquiescence as a defense, and the landlord’s case is stronger because the underlying conduct may itself be a local code violation. Some landlords have used unauthorized short-term rental conduct to support both a 3-day notice and a nuisance claim simultaneously. Tenants in this position have very limited defensive options and should consider whether settlement is the cleaner exit.

What to do right now

• Save the notice and the lease. Note the specific clause the landlord is invoking.
• Document how long the occupant has been there. Identify how the landlord found out and when.
• Pull rent payment records. If full rent was accepted after the landlord became aware, waiver may apply.
• If the occupant qualifies for a protected category (child, spouse, caregiver, domestic-violence safety), gather the supporting documentation.
• Check LARSO or AB 1482 coverage, both require cure opportunity for most substantial-obligation violations.
• If the lease allows adding occupants through landlord screening, submit the application within the notice period to demonstrate good-faith cure.

Related pages

• Eviction Defense overview
• 3-Day Notice to Perform or Quit
• Defective Notice Defense
• Waiver Defense
• Roommate Eviction
• LARSO (LA Rent Control)
• AB 1482 Just-Cause