When Is a Notice of Intent to Sue Required in California?

A notice of intent to sue in California is only legally required in a few specific types of cases. For most civil disputes — a breach of contract, a car accident, a landlord-tenant fight — you can file a lawsuit without warning the other side first. The mandatory pre-suit notice rules apply to medical malpractice claims, lawsuits against state or local government entities, residential construction defect claims under the Right to Repair Act, and consumer damages claims under the Consumer Legal Remedies Act. Each category has its own deadline, required contents, and delivery method, and missing any of them can delay or destroy your case.

When California Requires Pre-Suit Notice

California law does not impose a general duty to notify someone before suing them. For the vast majority of civil cases, you can walk into the courthouse and file. The exceptions are concentrated in areas where the legislature decided early communication could prevent litigation or protect certain defendants.

The main categories where a written notice is mandatory before you file:

Medical malpractice: at least 90 days’ notice to the healthcare provider under Code of Civil Procedure Section 364.
Claims against California government entities: a formal written claim under the Government Claims Act, due in as little as six months.
Residential construction defects: written notice to the builder under Civil Code Section 910 before suing under the Right to Repair Act.
Consumer protection damages claims: 30 days’ notice to the business under the Consumer Legal Remedies Act (CLRA).

Federal agencies are governed by a separate system — the Federal Tort Claims Act — which overrides state rules whenever the defendant is the United States or one of its agencies.

Medical Malpractice: 90-Day Notice Under CCP 364

You cannot file a professional negligence action against a healthcare provider in California unless the defendant has received at least 90 days’ notice of your intention to sue.¹ The requirement comes from the Medical Injury Compensation Reform Act (MICRA) and is meant to push cases toward settlement before a complaint is filed.²

“Healthcare provider” is defined broadly. It covers anyone licensed under Division 2 of the Business and Professions Code — physicians, surgeons, dentists, nurses, chiropractors, osteopaths — along with clinics, dispensaries, licensed health facilities, and their legal representatives. If you don’t know the name of a particular defendant when you file, you can name that person as a “Doe” under CCP 474 without having sent them the 90-day notice first.¹

What the Notice Must Say

There is no required form, but the statute sets a floor. The notice must tell the provider the legal basis of your claim and the type of loss you suffered, with enough specificity to describe the nature of your injuries.¹ A workable notice identifies the patient, names the provider or facility, describes what happened and when, explains why you believe the care was negligent, and outlines your injuries. A one-line letter saying “you committed malpractice” will not satisfy the statute. The goal is to give the provider enough information to investigate and evaluate settlement, not to draft your complaint.

How It Affects the Statute of Limitations

Medical malpractice claims must be filed within one year after you discover (or should have discovered) the injury, or within three years after the date of injury, whichever comes first.² If you serve the 90-day notice within the last 90 days of that limitations period, the filing deadline is tolled for 90 days from the date of service.¹ The practical takeaway: if you’re close to the deadline, sending the notice before it expires buys you another 90 days to file.

What Happens If You Skip the Notice

CCP 365 states that failure to comply with the notice chapter does not invalidate court proceedings or affect the court’s jurisdiction. So skipping the notice will not automatically kill the case. But the same statute makes non-compliance grounds for professional discipline, and the State Bar is directed to investigate attorneys who ignore the requirement.³ Defendants can also raise premature filing as a procedural objection, which creates delay and expense.

Claims Against California Government Entities

Suing a California state or local government body is not a notice-of-intent situation. It is a separate, formal process. The Government Claims Act (Government Code Sections 810 through 996.6) requires you to present a written claim to the public entity before filing a lawsuit for money damages.⁴

Deadlines are tight. You have six months from the date the cause of action accrues for claims involving personal injury, wrongful death, or damage to personal property, and one year for all other claims.⁵ Miss the six-month deadline on an injury claim and you lose the right to sue, with only narrow exceptions for late claims.

What the Claim Must Include

Government Code Section 910 lists the required contents:

Your name and mailing address, plus the address where you want notices sent.
The date, location, and circumstances of the incident.
A description of your losses as far as you know them.
The name of any government employee who caused the injury, if known.
The amount claimed if under $10,000, with a basis for the calculation. If the claim exceeds $10,000, you omit the dollar amount but must state whether it would qualify as a limited civil case.⁶

The 45-Day Response Period

The entity has 45 days to accept, reject, or otherwise act on the claim.⁷ If 45 days pass with no response, the claim is deemed rejected on the last day of that period. Only after rejection, whether written or by silence, can you file in court.⁴

Residential Construction Defect Claims

Before suing a builder over defects in a home, California’s Right to Repair Act (Civil Code Sections 895 through 945.5) requires written notice. Civil Code Section 910 says you must send it by certified mail, overnight mail, or personal delivery.⁸

The notice must include your name, address, and preferred contact method. It must state that you’re alleging a violation of the construction standards under the Act and describe the defect in enough detail for the builder to understand what is wrong and where. Homeowner associations or groups of homeowners can identify claimants by address rather than individual names. One trap worth knowing: using the builder’s regular warranty or customer-service process does not count. The statutory notice has to go out separately, even if you’ve already complained through other channels.⁸

Consumer Damages Claims Under the CLRA

If you want to recover money damages under the Consumer Legal Remedies Act (Civil Code Section 1770 and following), you must send the business written notice at least 30 days before filing suit.⁹

The notice must identify the specific violations under Civil Code Section 1770 and demand that the business correct, repair, replace, or otherwise fix the goods or services at issue. Send it by certified or registered mail, return receipt requested, to the location where the transaction took place or the business’s principal California office. If the business provides an adequate remedy within 30 days, you cannot pursue a damages action under the statute.⁹

If Your Claim Is Against a Federal Agency

Claims against federal agencies are not governed by California’s rules at all. The Federal Tort Claims Act requires you to file a formal administrative claim, typically on Standard Form 95, with the appropriate federal agency before suing in court.¹⁰

The administrative claim must be filed within two years after the cause of action accrues.¹¹ The agency then has six months to resolve it. Silence after six months counts as a denial, and you can proceed to federal court.¹⁰ Filing suit before the claim is denied or the six months expires leads to dismissal.

How to Deliver the Notice and Prove It

Delivery method matters, and it varies by claim type.

The medical malpractice notice under CCP 364 can be served using any method authorized by Chapter 5 of the Code of Civil Procedure (starting at Section 1010), which covers personal delivery, mail, and in some situations electronic service.¹ Certified mail with return receipt requested is the common choice because it creates proof of both delivery and the exact date, and that date starts the 90-day clock.

Construction defect notices must go by certified mail, overnight mail, or personal delivery.⁸ CLRA notices must be sent by certified or registered mail with return receipt requested.⁹

Whatever method you use, keep proof. Save the certified mail receipt, the signed return card, or any delivery confirmation. If a defendant challenges whether you complied with the notice requirement, that paperwork is your evidence.

Sending a Notice When It Is Not Required

Outside the categories above, sending a pre-suit demand letter is entirely voluntary, but it is often worth doing. A clear letter signals that you have identified the legal basis for the claim and calculated your damages, which can open the door to settlement without filing fees, discovery, and court appearances. If the matter does go to court, having sent a reasonable pre-suit demand can also help your position on good faith and, in cases where fees or sanctions are available, on how a judge views those requests.

A voluntary notice should identify the parties, describe the dispute, state the legal basis for the claim, specify the damages you’re seeking, and set a response deadline, typically 30 days. No statute dictates the format. Certified mail with return receipt is still the smart delivery method. If the other side ignores it, you’ve spent a few weeks and the cost of postage, and you file.

1
California Legislative Information. California Code of Civil Procedure CCP 364
2
California Supreme Court Resources. Russell v. Stanford University Hospital
3
California Legislative Information. California Code of Civil Procedure CCP 365
4
California Legislative Information. California Government Code GOV 945.4
5
California Legislative Information. California Government Code GOV 911.2
6
California Legislative Information. California Government Code GOV 910 – Contents of Claim
7
California Legislative Information. California Government Code GOV 912.4
8
California Legislative Information. California Civil Code CIV 910
9
California Legislative Information. California Civil Code CIV 1782
10
Office of the Law Revision Counsel. 28 USC 2675 – Disposition by Federal Agency as Prerequisite
11
GovInfo. 28 USC 2401 – Time for Commencing Action Against United States