Washington's Form 17 Seller Disclosure: What You Have to Tell Buyers

If you're selling a home in Washington, state law requires you to give the buyer a completed seller disclosure statement — universally called Form 17 — within five business days of mutual acceptance, unless your contract says otherwise. The buyer then has three business days from delivery to rescind the agreement, by delivering a separately signed written statement of rescission.

Form 17 asks what you actually know about the property across nine categories. It does not require you to inspect, investigate or hire anyone. It requires you to answer honestly about your actual knowledge — and that distinction is where most sellers either protect themselves or expose themselves.

What are the nine sections of Form 17?

The statute, RCW 64.06.020, sets out the required categories:

Section 9 is the catch-all, and it's the one that matters most. "Any other existing material defects" means precisely that — if you know about a problem and it isn't captured by sections one through eight, it belongs here.

What does "to the best of your knowledge" actually mean?

Form 17 asks what you know. It does not ask what you should have known, and it does not require you to go find out.

In practice:

You are not required to inspect. If you've never been in the crawlspace, you don't have to go in. Answering "don't know" is a legitimate answer when it's true.

You are required to disclose what you do know. If a contractor told you three years ago that the roof had five years left, you know something about the roof. If you had water in the basement during one heavy storm in 2023, you know something about flooding — even if it never happened again.

"Don't know" is not a safe harbor for things you do know. Answering "don't know" about a condition you're aware of is where sellers get into genuine trouble, because it converts an honest disclosure issue into a misrepresentation issue.

The practical test we give sellers: if a buyer found out about this after closing, would they feel they'd been told? If the answer is no, disclose it.

What happens if a seller doesn't disclose something?

Form 17 is a disclosure statement, not a warranty. You're not guaranteeing the condition of the property — you're representing your knowledge of it. But failing to disclose a known material defect can expose a seller to liability after closing, and Washington buyers do pursue these claims.

The stronger position for a seller is almost always more disclosure, not less. A disclosed problem is a negotiated problem — the buyer knows, adjusts their offer or asks for a credit, and moves forward. An undisclosed problem discovered in year two is a dispute.

We have watched sellers talk themselves out of disclosing something small because they worried it would scare a buyer. In a market where Bellevue homes are selling in about eight days with a 2.6-month supply, a disclosed and explained issue rarely kills a well-priced sale. Silence about it can.

Can a buyer waive Form 17?

Yes. Under the statute, a buyer may expressly waive the right to receive the seller disclosure statement. This happens, particularly in competitive situations where a buyer wants to make their offer cleaner.

Two things worth understanding about that:

A waiver doesn't erase the underlying duty not to misrepresent. A seller who affirmatively lies about a known defect is in a different position than one who simply didn't deliver a form.

Sellers should not encourage a waiver. If a buyer offers it, that's the buyer's decision. A seller or a listing agent pushing for one is inviting the exact argument they'd least like to have later.

When is Form 17 not required?

The disclosure requirement doesn't apply to every transaction. Common exemptions include certain foreclosure and trustee sales, transfers by court order, some transfers between co-owners or family members, and certain transfers to or from government entities.

If you think your sale might be exempt, confirm it with your broker or an attorney rather than assuming. The cost of being wrong is asymmetric.

A change is coming in January 2027

The version of RCW 64.06.020 currently in force is scheduled to be superseded by a revised version effective January 1, 2027. If you're selling in late 2026 or early 2027, ask your broker which version applies to your transaction and whether the form itself has changed.

We'll update this article when the new language takes effect.

How to fill out Form 17 without creating problems

Take it seriously and do it yourself. This is your statement about your knowledge. Your agent can explain the questions; they cannot answer them for you.

Gather your records first. Permits, contractor invoices, septic pumping receipts, roof warranties, HOA correspondence. Answering from documents beats answering from memory.

Use the comments space. Most sections allow explanation. "Yes — repaired in 2022 by a licensed contractor, invoice available" is a much better disclosure than a bare "yes," and it turns a red flag into a resolved item.

Answer "don't know" only when it's true. It's a legitimate answer. It's not a hiding place.

Deliver it on time. Five business days from mutual acceptance unless your contract says otherwise. Late delivery extends the buyer's rescission window and creates unnecessary uncertainty in your transaction.

Frequently asked questions

How long does a seller have to deliver Form 17 in Washington? Not later than five business days after mutual acceptance of a written purchase agreement, unless the parties agree otherwise in the contract.

How long does a buyer have to rescind after receiving Form 17? Three business days from the day the seller or seller's agent delivers the disclosure statement. The rescission must be a separately signed written statement — not a verbal notice or an email from an agent.

Do I have to inspect my house before filling out Form 17? No. The disclosure is based on your actual knowledge. You're not required to investigate, inspect or hire anyone. You are required to answer honestly about what you do know.

What if I don't know the answer to a question? "Don't know" is a valid answer when it's genuinely true — for example, about conditions that predate your ownership. It is not a valid answer for something you're aware of.

Can a buyer waive the seller disclosure statement? Yes, a buyer may expressly waive the right to receive it. Sellers shouldn't solicit that waiver, and waiving the form does not permit a seller to affirmatively misrepresent a known defect.

Does Form 17 make me liable for problems discovered after closing? Form 17 is a disclosure of your knowledge, not a warranty of condition. Undisclosed problems you knew about can create liability; problems you genuinely didn't know about generally do not. Specific outcomes depend on facts and on your contract — talk to an attorney if a claim arises.

We'll walk you through it line by line

Form 17 is the document sellers most often rush and most often regret rushing. It takes an hour to do properly and it is the single cheapest insurance policy in the transaction.

If you're thinking about selling, we'll go through it with you before you list — which is the right time, because it often surfaces items worth addressing while you still have the option.

Get a free home valuation and pre-listing consultation →

Tribeca NW Real Estate serves buyers and sellers across Bellevue, Kirkland, Redmond, Issaquah, Bothell and the greater Seattle metro. 1,675 homes closed and $1B+ in transaction volume. 500+ five-star Google reviews and 375+ five-star Zillow reviews.

This article is general information, not legal advice. Disclosure obligations depend on your specific transaction. Consult a real estate attorney for legal questions about your situation.

Sources cited in this post:

• RCW 64.06.020 — Washington State Legislature
• Bellevue housing market data — Houzeo