Disclosure Risk April 28, 2026 5 min read

Can a Seller Say "Unknown" on a California Disclosure Form?

Short answer: Yes. A California seller can legally mark "unknown" on the Transfer Disclosure Statement if they genuinely do not know the answer. California law requires sellers to disclose what they actually know, not all facts about the property. But "unknown" carries real risks for both sides. Courts have found sellers liable when "unknown" was used to sidestep disclosure of something they knew or should have known. And buyers who see many "unknowns" will make lower offers, add contingencies, or walk away.
Key Takeaways
  • "Unknown" is legally acceptable when it's truthful, not as a shield against disclosure
  • Courts apply a broad "material fact" standard: sellers are expected to know what reasonable inquiry would uncover
  • Homeowner's insurance typically does not cover post-close nondisclosure claims
  • For sellers: documented history replaces "unknown" and builds buyer confidence
  • For buyers: multiple "unknowns" are a due diligence trigger, not neutral information

What the Transfer Disclosure Statement requires

In California, most sellers of residential properties of one to four units are required to complete a Transfer Disclosure Statement (TDS) before closing. The TDS (standardized under California Civil Code Section 1102.6) asks sellers to disclose known material facts about the property's condition, systems, and history.

The TDS explicitly includes response options for "Yes," "No," and "Unknown" on many items. The unknown option exists because California's disclosure obligation is knowledge-based: sellers must disclose what they actually know. They are not required to investigate or hire experts to discover facts they genuinely do not know.

When "unknown" is legally acceptable

Legitimate uses of "unknown" include:

  • Inherited or estate properties: A seller who inherited a home and has never lived in it may genuinely not know the history of the HVAC system, roof work, or prior water intrusion.
  • Long-term absentee ownership: A landlord who has owned the property for twenty years but managed it through a property manager may lack direct knowledge of specific repair events.
  • Distant historical events: A seller who purchased the home ten years after a prior owner's permit or code violation may reasonably have no knowledge of those events.
  • Third-party work before purchase: Renovations done before the seller took ownership, with no records transferred at the prior sale.

When "unknown" creates legal exposure

The risk is that "unknown" is not a blanket safe harbor. California courts have applied a broad interpretation of what counts as a "material fact" that a seller is obligated to disclose, and have found sellers liable where:

  • The seller marked "unknown" on an item they were aware of but wanted to avoid disclosing, hoping the buyer would not discover it
  • The seller had received a notice, citation, or letter related to the issue (making it impossible to credibly claim ignorance)
  • The defect was visible and the seller's claim of non-knowledge was implausible
  • The seller failed to conduct reasonable inquiry when they had reason to suspect a problem
Post-close liability California homeowner's insurance policies typically exclude coverage for intentional acts and nondisclosure. If a buyer sues post-close for an undisclosed defect, the seller is usually defending out of pocket, without insurance coverage. The TDS is signed under penalty of perjury. A false "unknown" on a material item is not protected by an insurance policy.

What sellers should do instead of marking "unknown"

The counterintuitive truth: documented, structured history builds more buyer confidence than silence. A seller who can answer every TDS question with a specific, sourced fact is not exposing weakness. They are demonstrating a well-maintained, well-documented property.

Buyers who encounter a TDS full of "unknowns" interpret it as: the seller doesn't know, didn't maintain records, or doesn't want to say. All three interpretations reduce offer price and increase contingency demands.

  • Pull permit history before listing so you can answer permit-related questions with facts, not unknowns.
  • Review your own insurance claim history. Your insurer can provide a summary of claims filed on the property. If you filed claims, disclose them specifically rather than leaving "unknown" on water intrusion or fire damage questions.
  • Request records from the city. Code violations, open code cases, and inspection records are public. Retrieve them before a buyer does.
  • Document contractor work. Even if permits weren't pulled, documenting the contractors used, dates, and scope of work creates a paper trail that supports your disclosure.
  • Consult your listing agent and attorney. For complex properties or known issues, work with your agent and a real estate attorney to word disclosures accurately and protectively.

Know your home's full record before the buyer does. Replace "unknown" with facts.

Run a HomeHistory Report for Sellers

What buyers should do when they see multiple "unknowns"

From a buyer's perspective, "unknown" on a Transfer Disclosure Statement is not neutral. It is a signal that the property's history may not have been maintained, documented, or fully disclosed. The right response is not to walk away. Run independent due diligence before your contingency deadline.

  • Run a permit history check. Open permits, failed inspections, and unpermitted additions are in the public record regardless of what the seller disclosed. See our permit guide.
  • Request a CLUE report or seller's insurance claim history. Ask the seller's agent whether the seller will authorize release of their insurance claim history. In California, sellers are required to disclose material insurance claims they are aware of on the TDS, but requesting the actual CLUE report gives you the documented record.
  • Review the county assessor and recorder records. Ownership chain, prior sale dates, and assessed improvement value versus permitted footprint can all reveal gaps in the seller's disclosure.
  • Search for code violations and enforcement actions. Most California cities publish code enforcement records. Open cases on a property the seller marked "unknown" on physical conditions are a red flag.
  • Use your contingency period strategically. The inspection and due diligence contingency exists to give you time to discover what the seller didn't disclose. If multiple "unknowns" appear on the TDS, make full use of the contingency period before removing it.

Why It Matters Before Closing

66% of first-time homeowners encounter unexpected issues after purchase. 41% spend more than expected on repairs within the first year. The gap between what the seller knew and what the buyer discovered post-close is not always intentional deception. Sometimes it is genuinely poor recordkeeping. But the financial consequences fall on the buyer either way.

The cost of independent due diligence (pulling permits, reviewing enforcement records, requesting claim history) is measured in hours and hundreds of dollars. The cost of discovering a significant undisclosed defect after closing is measured in tens of thousands of dollars and months of legal dispute.

The right approach for both sides Sellers who document their property's history before listing close faster, with fewer contingencies, and with lower post-close dispute risk. Buyers who run independent due diligence before removing contingencies negotiate from strength, not hope. The TDS disclosure is the starting point, not the end of the conversation.

Sources HomeHistory Checks for Disclosure Gaps

  • County Recorder Ownership chain, deed history, recorded liens and encumbrances
  • County Assessor Assessed improvement value versus permitted footprint; tax delinquency status
  • City Code Enforcement Portals Open cases, notices of violation, orders to comply
  • BuildZoom / LADBS / eTrakit Permit history, open permit status, final inspection sign-offs
  • CA CSLB Contractor license and disciplinary history for any disclosed contractor work
  • OpenFEMA NFIP Claims Flood insurance claim history by address, independent of what the seller discloses
  • MLS / Transaction History Prior listing dates, days on market, price reductions, relisting history

Related Articles

Sellers: replace "unknown" with facts. Buyers: check what the seller didn't disclose.

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This article is for informational purposes only and does not constitute legal advice. California disclosure law is complex and fact-specific. Consult a licensed California real estate attorney regarding your specific disclosure obligations as a seller, or your rights as a buyer, before acting on information in this article.