Demurrer to Unlawful Detainer Complaint (California)

What a demurrer does

A demurrer is a pleading-stage motion under California Code of Civil Procedure sections 430.10-430.80 that argues the Complaint fails to state a cause of action even if every factual allegation is true. The demurrer focuses on the four corners of the Complaint and its attached exhibits, not on disputed facts or evidence.

In the unlawful detainer context, a demurrer typically attacks: (1) the eviction notice attached to the Complaint as defective, (2) the failure of the Complaint to allege required elements (proper service, rent control compliance, just-cause statement), or (3) a fundamental legal defect (e.g., the property is exempt from the asserted cause of action).

Common demurrer grounds in California UD cases

Defective notice attached to the Complaint

UD Complaints in California must attach the underlying eviction notice as Exhibit A. If the notice is defective on its face, missing required content, wrong cure period, demanding overstated rent, missing CCP 1161.1 certification, the demurrer challenges the Complaint based on the defective notice. See our guides on defective notice defense and rent overstatement.

Missing rent control / just-cause compliance allegations

For properties covered by LARSO, AB 1482, or local rent control ordinances, the Complaint must allege the landlord’s compliance with applicable just-cause and relocation assistance requirements. Omissions are demurrer-eligible.

Missing required UD allegations

A UD Complaint must allege: (1) the landlord-tenant relationship; (2) the date of expiration or breach; (3) proper service of the eviction notice; (4) the tenant’s holdover or non-compliance; (5) the demand for possession. Missing allegations are demurrer-eligible.

Improperly-pled multiple causes of action

UDs alleging multiple bases (unpaid rent plus lease breach, for example) must adequately plead each. Mixing causes of action improperly can support a demurrer for uncertainty or failure to state a cause.

Statute of limitations

UD claims based on unpaid rent are subject to a 1-year notice limit (CCP 1161(2) — rent older than 12 months cannot be the basis). Claims based on lease breach may have other timing constraints.

Outcomes of a demurrer

• Sustained with leave to amend. The Complaint fails as currently pled, but the landlord may file an amended Complaint within a specified time (typically 10 days). If the amendment cures the defect, the case proceeds. If not, the tenant may demurrer again.
• Sustained without leave to amend. The Complaint fails and cannot be cured by amendment. The case is dismissed.
• Overruled. The Complaint is legally sufficient as pled. The tenant must answer (typically within 10 days) and the case proceeds on the merits.

Timing and strategic considerations

A demurrer in a UD must be filed within the 10-court-day Answer window. Filing a demurrer instead of an Answer is strategic: if granted, the case is delayed and may be dismissed, if denied, the tenant has additional time to answer.

A demurrer can be combined with, or filed after, a Motion to Quash, depending on the case posture. Counsel will evaluate which procedural tool offers the most use in the specific case.

Preservation of issues for appeal

Even an overruled demurrer preserves the issue for appeal. If the case ultimately proceeds and the tenant loses at trial, the legal sufficiency arguments raised in the demurrer can be revisited on appeal, particularly important for novel rent control compliance issues and complex notice defects.

Related guides

• Motion to Quash Service of Summons
• Defective notice defense
• Rent overstatement defense
• I got served eviction papers, what to do now
• Unlawful detainer timeline