The California civil discovery rules give each side in a lawsuit the power to demand information from the other before trial using five main tools: interrogatories, requests for production of documents, requests for admission, depositions, and physical or mental examinations. Written requests must be answered within 30 days, and all discovery has to be complete at least 30 days before the trial date, with any related motions heard at least 15 days before trial.1California Legislative Information. California Code CCP 2024.020 Miss a deadline and the consequences are automatic and hard to undo.
What You Can Ask For
The scope is deliberately wide. You can request anything relevant to the lawsuit that isn’t protected by a legal privilege, even information that wouldn’t itself be admissible at trial, so long as the request could reasonably lead to admissible evidence.2California Legislative Information. California Code CCP 2017.010 – 2017.020 That covers who knows what, where documents sit, and what electronically stored information exists.
Some categories stay off limits. The attorney-client privilege protects confidential communications with your lawyer.3California Legislative Information. California Evidence Code 954 – Lawyer-Client Privilege The physician-patient privilege covers confidential medical communications with your doctor.4California Legislative Information. California Evidence Code 994 – Physician-Patient Privilege Work-product protections shield your attorney’s case preparation files. These privileges can be waived, so handing privileged material to a third party by mistake can destroy the protection for good.
The Five Discovery Tools
Interrogatories
Interrogatories are written questions the receiving party must answer under oath. There are two kinds. Form Interrogatories are standardized questions approved by the Judicial Council, with no numerical limit. Special Interrogatories are custom-drafted for your case, capped at 35 as a matter of right; you can send more only with a declaration explaining why each additional question is necessary.5California Legislative Information. California Code CCP 2030.030 – Written Interrogatories
Requests for Production of Documents
A production request demands specific documents, electronically stored information, or physical objects for inspection and copying.6California Legislative Information. California Code CCP 2031.010 – Inspection Demand When the other side produces documents, they must label each one with the specific request number it answers.7California Legislative Information. California Code CCP 2031.280 – Response to Demand for Inspection That rule exists because disorganized document dumps are a common tactic for burying important records.
Requests for Admission
These ask the other party to admit or deny specific facts or confirm the authenticity of documents. Anything admitted is locked in for that case and does not need to be proved at trial.8Justia Law. California Code CCP 2033.410 – Effect of Admission The admission applies only to the current lawsuit.
Ignoring requests for admission carries the harshest automatic penalty in California discovery. If you miss the response deadline, the requesting party can ask the court to deem every request admitted, and the court must grant that motion unless you’ve already served a compliant response before the hearing. Monetary sanctions against the party or attorney responsible are mandatory.9California Legislative Information. California Code CCP 2033.280 – Failure to Respond to Requests for Admission
Depositions
A deposition is live, oral questioning of a party or witness under oath, outside the courtroom. A court reporter transcribes everything, and video is common.10California Legislative Information. California Code CCP 2025.010 – Oral Deposition All attorneys questioning a deponent (other than the deponent’s own lawyer) share a total of seven hours. A court can extend that limit when needed for a fair examination or when the deponent or circumstances have caused delays.11California Legislative Information. California Code CCP 2025.290 – Deposition Time Limits If a deponent refuses to answer a question or produce a document, the questioning party has 60 days after the deposition record is completed to move to compel.12California Legislative Information. California Code CCP 2025.480 – Motion to Compel Answer at Deposition
You can also reach people who aren’t parties by issuing a deposition subpoena, for oral testimony, written questions, or production of business records.13California Legislative Information. California Code CCP 2020.010 – Nonparty Discovery Methods Business records subpoenas are how most medical records, bank statements, and employment files get into a case.
Physical and Mental Examinations
When a party’s physical or mental condition is directly at issue, any party can seek a medical examination of that person. A single physical examination is available by right in personal injury cases. Mental examinations and additional physical exams require a court order, and the motion must specify the time, place, scope, and the examiner’s identity and specialty, with a meet-and-confer declaration attached.14California Legislative Information. California Code CCP 2032.310 – Motion for Physical or Mental Examination
How Long You Have To Respond
For written discovery, the responding party has 30 calendar days from the date of service to answer or object.15California Legislative Information. California Code CCP 2030.260 – Response Time for Interrogatories16California Legislative Information. California Code CCP 2031.260 – Response Time for Production Demands How the request was served changes the deadline:
- Mail within California adds five calendar days.17California Legislative Information. California Code CCP 1013 – Service by Mail
- Mail from or to a point outside California but inside the U.S. adds ten calendar days.
- Mail to or from outside the U.S. adds twenty calendar days.
- Electronic service adds two court days, not calendar days.18California Legislative Information. California Code CCP 1010.6 – Electronic Service
A response either provides the information or asserts a specific legal objection. Answers to interrogatories and responses to requests for admission must be verified under oath. If you can’t fully comply, you must describe the efforts you made to find the information. Objections have to state specific legal grounds, like privilege, irrelevance, or undue burden.
What a Missed Deadline Costs You
Missing a discovery deadline is not just inconvenient. It triggers automatic consequences that are hard to reverse. Fail to respond to interrogatories on time and you waive every objection you could have raised, including privilege and work-product protections. The other side can then move to compel, and the court will impose monetary sanctions on the losing side of that motion unless the failure was substantially justified.19California Legislative Information. California Code CCP 2030.290 – Failure to Respond to Interrogatories
The same waiver rule applies to document production. Requests for admission are worse: the court can deem every fact in the requests admitted against you, which effectively concedes those issues without a fight.9California Legislative Information. California Code CCP 2033.280 – Failure to Respond to Requests for Admission A court can undo the waiver if the late response came from genuine mistake or excusable neglect, but that relief is discretionary. Calendar every discovery deadline the day you receive the request.
When Discovery Must Be Finished
All discovery must be complete at least 30 days before the date originally set for trial, and any related motions must be heard at least 15 days before trial.20California Legislative Information. California Code CCP 2024.020 – Discovery Cutoff One detail trips litigants constantly: if the trial is continued, the discovery cutoff does not automatically reopen with it. You have to file a separate motion to reopen discovery, and the court can deny it. Work backward from the trial date when you plan depositions and document requests.
Pushing Back on Unreasonable Requests
When discovery requests are unreasonably burdensome, duplicative, or reach sensitive information the case doesn’t need, the targeted party can ask the court for a protective order. The court can restrict the frequency or extent of discovery when the information is available from a less burdensome source or when the method is unduly expensive given what’s at stake.21California Legislative Information. California Code CCP 2019.030 – Protective Orders The losing party on a protective order motion faces mandatory monetary sanctions unless the court finds substantial justification.
Before any discovery dispute reaches a judge, California requires the parties to meet and confer. The attorneys must make a genuine, good-faith attempt to work out each disputed issue, in person, by phone, or by videoconference.22California Legislative Information. California Code CCP 2016.040 – Meet and Confer Requirement A motion filed without a proper meet-and-confer declaration can be denied on that ground alone.
If informal negotiation fails, the requesting party can move to compel a response or a more complete response. Interrogatory motions fall under CCP 2030.300; production motions under CCP 2031.310.23California Legislative Information. California Code CCP 2030.300 – Motion to Compel Further Interrogatory Responses24California Legislative Information. California Code CCP 2031.310 – Motion to Compel Further Production Responses Both carry a strict 45-day deadline from the date you receive the inadequate response. Miss that window and you permanently waive the right to compel a better answer, unless both sides agreed in writing to a later date.
Sanctions for Discovery Abuse
California defines discovery misuse broadly to include failing to respond, making objections without substantial justification, giving evasive answers, and disobeying court orders.25California Legislative Information. California Code CCP 2023.030 – Discovery Sanctions Courts have a graduated set of penalties:
- Monetary sanctions order the offending party or attorney to pay the other side’s reasonable expenses and attorney’s fees. This is the most common sanction and is often mandatory unless the court finds substantial justification.
- Issue sanctions treat certain facts as established against the offending party, or bar that party from making specific claims or defenses.
- Evidence sanctions prohibit the offending party from introducing specific evidence at trial.
- Terminating sanctions strike the offending party’s pleadings, dismiss their case, or enter a default judgment. This is the nuclear option, typically reserved for repeated or willful violations.
- Contempt sanctions treat the abuse as contempt of court.
Courts generally cannot sanction a party for losing electronically stored information through the routine, good-faith operation of a computer system. That protection vanishes once a party knows or should know that litigation is coming and fails to take steps to preserve relevant data.