Interrogatories in California civil cases are written questions one party sends another during discovery, and the recipient must answer them in writing and under oath. A party may serve any number of pre-approved form interrogatories, but only 35 specially drafted ones as a matter of right. Responses are due 30 days after service, and missing that deadline waives every objection, including privilege.
The Two Types and How Many You Can Ask
Form interrogatories are the standardized, pre-approved questions covering common case types such as personal injury, contract, and employment disputes. There is no cap on how many form interrogatories you can serve.
Special interrogatories are custom questions written for the facts of your case. Each party can serve up to 35 special interrogatories on any single opposing party as a matter of right.1California Legislative Information. California Code of Civil Procedure 2030.030 Anything unused in a first set can go into a later set. To go over 35, the propounding party must attach a Declaration of Necessity that follows the format in CCP 2030.050 and, under penalty of perjury, explains why the extra questions are needed under the factors listed in CCP 2030.040.2California Legislative Information. California Code of Civil Procedure 2030.050 Without that declaration, the other side can refuse to answer anything past number 35.
Limited Civil Cases Are Capped Differently
In a limited civil case (generally disputes involving $35,000 or less), you get a combined total of 35 across interrogatories, document requests, and requests for admission. Not 35 of each. Thirty-five total.3California Legislative Information. California Code of Civil Procedure 94
When Interrogatories Can Be Served
A plaintiff cannot serve interrogatories at the moment the case is filed. Without a court order, the earliest a plaintiff may propound them is 10 days after the summons is served on the defendant or after the defendant appears, whichever happens first. In unlawful detainer cases, that waiting period drops to five days.4California Legislative Information. California Code of Civil Procedure 2030.020 A defendant can serve interrogatories any time after being served or appearing.
On the other end of the case, discovery must be completed no later than 30 days before the date initially set for trial, and any discovery motions must be heard at least 15 days before that initial trial date.5California Legislative Information. California Code of Civil Procedure 2024.020 Continuing the trial date does not automatically reopen discovery. If you need more time after a continuance, you need a separate order.
Drafting and Serving Them
Special interrogatories have to follow specific formatting rules. Each set is numbered consecutively, and each question within the set is separately identified by number or letter. Every question must be self-contained. No subparts. No compound questions bundling several inquiries into one. No preface or instruction unless it comes from an approved form. Any specially defined term must appear in all capital letters wherever it is used.
You cannot draft a “continuing” interrogatory that would force the other side to keep updating its answer as new information surfaces. Each interrogatory captures a snapshot. To pick up later developments, you serve supplemental interrogatories instead.
Interrogatories can be served by personal delivery, mail, or electronic means. Represented parties are required to accept electronic service of any document that could otherwise be served by mail, so e-service is effectively the default when both sides have attorneys.6California Legislative Information. California Code of Civil Procedure 1010.6 Self-represented parties can consent but are not obligated to. The propounding party keeps the original questions and the proof of service and does not file them with the court.
Response Deadline and Extensions
The baseline deadline is 30 days after service.7Justia Law. California Code of Civil Procedure 2030.210-2030.310 – Section 2030.260 The method of service adjusts that clock:
- Mail within California: add 5 calendar days, for an effective deadline of 35 days.8California Legislative Information. California Code of Civil Procedure 1013
- Electronic service: add 2 court days (weekends and court holidays don’t count).6California Legislative Information. California Code of Civil Procedure 1010.6
- Mail from outside California but within the United States: add 10 calendar days.
Unlawful detainer cases run on a much tighter schedule: responses are due five days after service, not 30. Either side can also ask the court by motion to shorten or extend the response time.
What a Response Must Contain
For each interrogatory, the responding party gives one of three things: a direct answer, a specific objection, or an election to produce documents instead of summarizing them.
Answers
Each answer must be as complete and straightforward as the information reasonably available to you permits.9Justia Law. California Code of Civil Procedure 2030.210-2030.310 – Section 2030.220 If you cannot answer fully, you answer to the extent you can. There is also a duty to make a reasonable effort to find the information by asking others or checking your own records. “I don’t know” only works if you genuinely cannot obtain the answer after a good-faith search and the information is not equally available to the other side.
Objections
Objections must state a specific legal ground. Privilege claims have to name the specific privilege; work-product claims have to be expressly asserted.10California Legislative Information. California Code of Civil Procedure 2030.240 If only part of a question is objectionable, you still have to answer the rest. Boilerplate objections that don’t explain why a specific question is burdensome or irrelevant are a common reason motions to compel get granted.
Producing Documents Instead of Answering
When answering would essentially require summarizing a large volume of documents and the burden of doing so is about the same for both parties, you can point the other side to the specific documents.11Justia Law. California Code of Civil Procedure 2030.210-2030.310 – Section 2030.230 Your specification has to be detailed enough for the propounding party to locate and identify the documents as easily as you could, and you must give them a reasonable chance to inspect and copy them.
Verification and Signatures
Responses have to be signed under oath by the responding party. That is called verification. For a business entity, an officer or agent signs. The attorney separately signs any responses that contain objections.12Justia Law. California Code of Civil Procedure 2030.210-2030.310 – Section 2030.250 Responses that contain only objections don’t need verification. A verification signed outside California must include specific language declaring, under penalty of perjury “under the laws of the State of California,” that the responses are true and correct.13California Legislative Information. California Code of Civil Procedure 2015.5
Each response carries the same number as its interrogatory and appears in the same sequence. The statute does not require repeating the question text before each answer, but doing so is standard practice.
What Happens If You Miss the Deadline
A party who fails to serve a timely response waives every objection, including objections based on attorney-client privilege and work-product protection.14California Legislative Information. California Code of Civil Procedure 2030.290 The right to produce documents in lieu of answering is also forfeited. The propounding party can then file a motion to compel responses, and courts typically grant it along with monetary sanctions.
There is a narrow escape hatch. The court can relieve you from the waiver if two conditions are met: you have since served a response that substantially complies with the rules, and your failure was the result of mistake, inadvertence, or excusable neglect. Courts don’t grant this relief generously.
Challenging Inadequate Responses
When responses arrive but the answers are evasive, incomplete, or the objections lack merit, the propounding party can move to compel a further response. That is a different motion than the one for total non-response. This one targets bad responses, not missing ones.
Before filing, the propounding party must genuinely try to resolve the dispute informally. This meet-and-confer step requires real communication: a phone call, an in-person meeting, or at minimum a detailed letter identifying why each response is deficient. The effort has to be documented in a declaration attached to the motion. Courts take this seriously, and a motion without meaningful meet-and-confer efforts is often denied or continued.
The deadline is 45 days after service of the verified response. Miss that window and the right to challenge is permanently waived, unless both parties agreed in writing to a later date.15California Legislative Information. California Code of Civil Procedure 2030.300 The 45-day clock only starts when a verified response is served. If the other side sends responses without the required verification, those are treated as no response, and the clock has not begun.
Updating Answers Later
Supplemental Interrogatories
Because interrogatories only capture what a party knew when it answered, California lets you serve supplemental interrogatories, separate from the 35-question limit, to ask about information the other side has learned since.16California Legislative Information. California Code of Civil Procedure 2030.070 You get to do this twice before a trial date is set, and once more after. Beyond that, you need a court order showing good cause.
Amended Responses
If you realize your own earlier answer was wrong, you can serve an amended response without asking the court’s permission.17California Legislative Information. California Code of Civil Procedure 2030.310 The other side can still use your original answer at trial, though, and can ask the court to make the original binding if the mistake caused them real prejudice and you have no good justification. Amending sooner is always better than amending later.
Sanctions for Discovery Misuse
Courts have broad authority to sanction parties who misuse discovery. Misuse includes failing to respond, giving evasive responses, asserting frivolous objections, disobeying discovery orders, and skipping the meet-and-confer process.18California Legislative Information. California Code of Civil Procedure 2023.030 The available sanctions escalate:
- Monetary sanctions are the most common. The court orders the offending party or the attorney to pay the other side’s reasonable expenses and attorney’s fees caused by the misconduct. Under CCP 2023.050, as amended by SB 235, the minimum monetary sanction for certain bad-faith violations is $1,000.19California State Senate. SB 235 Senate Judiciary Committee Analysis
- Issue sanctions: the court declares certain facts established or bars the party from contesting specific issues.
- Evidence sanctions: the court bars introduction of designated evidence.
- Terminating sanctions: the court can strike pleadings, dismiss the case, or enter default judgment, reserved for egregious or repeated misconduct after lesser sanctions have failed.
- Contempt: the court treats the abuse as contempt of court.
Courts generally start with monetary sanctions and only escalate when a party keeps obstructing. A single missed deadline rarely produces a terminating sanction. A pattern of stonewalling can end your case entirely.