CCP 430.10: Demurrer Grounds, Deadlines, and Sanctions

California Code of Civil Procedure section 430.10 sets out eight grounds a defendant can use to attack a complaint, cross-complaint, or other pleading through a demurrer. The grounds run from the court’s lack of authority over the case through a plaintiff’s lack of capacity to sue, duplicate lawsuits, missing or improperly joined parties, failure to state a cause of action, uncertainty, unspecified contract type, and the absence of a required certificate in professional negligence claims against architects, engineers, or land surveyors. Each ground is labeled by subdivision, (a) through (h), and a demurrer must specify which one it relies on.

What a Demurrer Does

A demurrer is a formal objection that a pleading is legally defective. The court assumes every factual allegation in the complaint is true, then decides whether those facts add up to a valid claim. It does not challenge what actually happened; it challenges whether the pleading, as written, satisfies the law. When the objection appears on the face of the pleading or from facts the court can judicially notice, it is raised by demurrer. When the defect is not visible on the face of the complaint, the defendant can raise it later as a defense in the answer.¹

A demurrer is not the same as a motion to strike, which targets specific words, phrases, or allegations within a pleading rather than an entire cause of action. A defendant can file a demurrer and an answer at the same time.¹

The Eight Grounds Under Section 430.10

Some grounds are “general” demurrers that go to the core legal validity of the claim. Others are “special” demurrers that target procedural or technical defects. Labeling the right subdivision matters: courts have no obligation to consider arguments tied to the wrong one.

(a) Lack of Subject Matter Jurisdiction

Subdivision (a) applies when the court lacks authority over the type of case being brought. If a case belongs exclusively in federal court or a specialized tribunal, the defendant can demur on this ground. A court without subject matter jurisdiction cannot act on a case regardless of how well-pleaded it is.²

(b) Lack of Legal Capacity to Sue

Subdivision (b) applies when the person or entity that filed the complaint lacks the legal right to bring a lawsuit. A corporation whose charter has been suspended or revoked is a common example. Minors and people who have been declared legally incompetent also lack capacity to sue on their own, though they can act through a guardian or representative. The question is not whether the plaintiff has a good case, but whether they have standing to bring any case at all.²

(c) Another Action Pending

Subdivision (c) covers situations where the same plaintiff has already filed another lawsuit against the same defendant over the same dispute. The remedy is abatement: the second case gets paused or dismissed rather than running in parallel. The parties, the claims, and the underlying facts all need to substantially overlap.²

(d) Defect or Misjoinder of Parties

Subdivision (d) addresses problems with who is in the lawsuit. The wrong parties may have been joined together in a single action, or a necessary party may have been left out. If someone whose presence is required for a fair resolution has not been named, or if unrelated parties and claims have been improperly lumped together, this ground gives the defendant a way to object.²

(e) Failure to State a Cause of Action

Subdivision (e) is the workhorse of demurrer practice. It argues that even accepting every factual allegation as true, the complaint does not plead enough facts to establish any recognized legal claim. Every cause of action has specific elements. A negligence claim, for example, requires facts showing the defendant owed a duty, breached it, and that the breach caused actual harm. If the complaint skips or fails to support any required element, the claim falls short under subdivision (e).²

Courts evaluating this ground accept all properly pleaded facts but ignore bare legal conclusions. “The defendant was negligent,” by itself, is a conclusion, not an allegation. A successful demurrer on this ground can end a case entirely if the plaintiff cannot fix the problem, though courts usually give at least one chance to amend.

(f) Uncertainty

Subdivision (f) targets complaints so unclear the defendant cannot figure out what claim is actually being made. The statute defines “uncertain” to include pleadings that are ambiguous or unintelligible. This is a special demurrer and, in practice, harder to win than a subdivision (e) challenge. Courts tend to read complaints generously, and if the overall meaning is discernible despite sloppy drafting, a demurrer for uncertainty will often be overruled. It matters most when a complaint is genuinely too vague for the defendant to prepare a meaningful response.²

(g) Contract Type Not Specified

Subdivision (g) applies only in contract disputes. It allows a demurrer when the complaint does not indicate whether the contract is written, oral, or implied by the parties’ conduct. The distinction matters because different rules govern each type, including statutes of limitations and evidentiary requirements. The fix is straightforward: the plaintiff amends to specify the contract type.²

(h) Missing Professional Negligence Certificate

Subdivision (h) applies when a plaintiff sues an architect, professional engineer, or land surveyor for professional negligence but fails to file the certificate required by CCP section 411.35. That section requires the plaintiff’s attorney to certify that they consulted with a licensed professional in the same discipline and concluded there is reasonable cause for filing the action.³ Without the certificate, the defendant can demur under subdivision (h). The ground exists to filter out baseless professional negligence claims before they force defendants into expensive litigation.²

Filing Deadline and Meet-and-Confer

A demurrer must be filed within 30 days after the defendant is served with the complaint or cross-complaint.⁴ Before filing, the demurring party must meet and confer with the opposing party in person, by phone, or by video to try to resolve the objections without court involvement. The conversation must happen at least five days before the responsive pleading is due. If the parties cannot connect in time, the demurring party gets an automatic 30-day extension by filing a declaration explaining the situation.⁵

Meet-and-confer is not just a formality. The demurring party must identify every cause of action it plans to challenge and explain the legal basis for each objection. The opposing party must either defend its pleading or explain how it could fix the problems. That said, a court will not overrule or sustain a demurrer based solely on whether the meet-and-confer was adequate.⁵

The demurrer itself must be accompanied by a memorandum of points and authorities laying out the legal arguments. A court can treat the absence of a memorandum as a concession that the demurrer lacks merit and deny it on that basis alone.⁶

What Happens After the Court Rules

The court will either sustain the demurrer (agree with the objection) or overrule it (reject the objection). When a demurrer is overruled, the defendant typically must file an answer within a set time, and the case moves forward. When a demurrer is sustained, the outcome depends on whether the court grants leave to amend.

Most of the time, courts sustain demurrers with leave to amend, giving the plaintiff a chance to fix the complaint. This is especially true the first time around, because courts strongly favor resolving cases on the merits rather than on technicalities. The plaintiff files an amended complaint addressing the deficiencies the court identified. If the defendant believes the amended complaint still falls short, they can demur again, and the cycle repeats.

There are limits. A complaint generally cannot be amended more than three times in response to demurrers, unless the plaintiff can show the court that additional facts exist that could cure the problem.⁵ Separately, a plaintiff has a one-time right to amend without court permission before the defendant files an answer or demurrer, which is a useful option when a plaintiff spots a fixable defect early.

When the court sustains a demurrer without leave to amend, the defect is incurable. No amount of redrafting will produce a valid claim. The cause of action is dismissed. If the demurrer knocked out every cause of action in the complaint, the entire case is over.

Personal Jurisdiction Is Not a 430.10 Ground

Section 430.10 does not cover personal jurisdiction, meaning the court’s authority over the specific defendant as opposed to its authority over the subject matter. If a defendant believes the court lacks personal jurisdiction, the proper procedure is a motion to quash service of summons under CCP section 418.10, not a demurrer.⁷

Order matters here. A defendant who files a demurrer without first raising personal jurisdiction through a motion to quash waives that defense entirely.⁷ Defendants with both jurisdictional and pleading issues need to address them in the right sequence or lose the jurisdictional argument permanently.

Sanctions for Frivolous Demurrers

Filing a demurrer that has no legal basis can expose the filing party to sanctions under CCP section 128.7. That statute requires every pleading and motion to be supported by existing law or a good-faith argument for changing it, and bars filings made primarily to harass or delay. An attorney who signs a frivolous demurrer is certifying that it has legal and factual merit.⁸

The opposing party can seek sanctions by filing a motion that describes the specific violation. The statute includes a 21-day safe harbor: the motion must be served on the other side first, and if the offending filing is withdrawn or corrected within 21 days, the sanctions motion can never be filed with the court. Sanctions are limited to what is necessary to discourage future misuse and can include attorney’s fees and costs the other side incurred because of the frivolous filing.⁸

1
California Legislative Information. California Code of Civil Procedure CCP 430.30
2
California Legislative Information. California Code of Civil Procedure CCP 430.10
3
California Legislative Information. California Code of Civil Procedure CCP 411.35
4
California Legislative Information. California Code of Civil Procedure CCP 430.40
5
California Legislative Information. California Code of Civil Procedure CCP 430.41
6
Judicial Branch of California. California Rules of Court Rule 3.1113
7
California Legislative Information. California Code of Civil Procedure CCP 418.10
8
California Legislative Information. California Code of Civil Procedure CCP 128.7