To succeed in a breach of contract claim in California, a plaintiff must prove the following four essential elements by a preponderance of the evidence:

1. The Existence of a Valid Contract: There must be a legally enforceable agreement between the parties. This requires a clear offer, an unequivocal acceptance, and consideration (the exchange of something of value, such as money or services).
2. The Plaintiff’s Performance or Legal Excuse: The plaintiff must demonstrate that they fulfilled their own obligations under the contract or, alternatively, that they had a legally recognized excuse for not performing (such as the other party’s actions preventing their performance).
3. The Defendant’s Material Breach: The plaintiff must establish that the defendant failed to perform one or more material terms of the agreement. A material breach is a substantial failure that goes to the heart of the contract, depriving the plaintiff of the benefit of the bargain.
4. Resulting Damages: The plaintiff must prove they suffered measurable, actual harm as a direct result of the defendant’s breach. This includes establishing both actual cause (“but-for” the breach) and proximate cause (the harm was a reasonably foreseeable result of the breach).

• Elements of Breach of Contract California: Essential Legal Guide