What the Seller Disclosure Statement Actually Is
In Washington, the seller disclosure statement is a standardized questionnaire — commonly known in the Seattle market as Form 17 — in which the seller reports what they know about the property. It is governed by state law, and for most residential sales it is a required part of the transaction rather than an optional courtesy.
It is a statement of the seller's own knowledge, not a guarantee of the home's condition. Sellers are not expected to be inspectors; they are expected to be honest about what they have seen, been told, or experienced while owning the home.
What You'll Be Asked About
The form walks through the major parts of the property: the structure and foundation, the roof, water intrusion or past leaks, the sewer and drainage systems, electrical, plumbing, heating, and any appliances that convey. It also asks about environmental and legal matters — buried oil tanks, lead-based paint in older homes, soil or slope problems, easements, HOA obligations, and pending claims.
In Seattle, a few questions deserve extra thought: whether the home was ever heated with oil, whether there have been sewer line problems, whether there is any history of settling or drainage trouble, and whether any work was done without permits.
'Don't Know' Is an Allowed Answer — With Limits
Sellers may answer 'don't know' when they genuinely lack knowledge, which is common for sellers who inherited a home or bought it recently. But 'don't know' is only a safe answer when it is true. Marking it to avoid addressing something you suspect or have been told about invites exactly the kind of dispute it is meant to avoid.
If you have a document, repair invoice, or prior inspection report that speaks to a question, treat that as knowledge. When in doubt, disclose what you have and let the buyer's inspection take it from there.
Unpermitted Work: The Question Sellers Underestimate
Finished basements, converted garages, added bathrooms, and informal ADUs are common in older Seattle homes, and not all of them were permitted when built. If you know — or reasonably suspect — that work was done without a permit, this is the section where honesty matters most.
Unpermitted work does not automatically kill a sale, but surprises discovered late almost always cost sellers more in negotiation and trust than a clear disclosure at the start. If you're unsure about a past renovation, a conversation with your agent before you list is worth having.
How Disclosure Interacts With the Buyer's Timeline
After the buyer receives the completed statement, Washington law gives them a short window to review it, and in many situations the right to withdraw if the disclosures concern them. For sellers, that is a strong reason to provide it early, ideally with the listing, so any concerns surface before you're under contract rather than after.
If something material changes between completing the form and closing — a new leak, a failed inspection item — the buyer should be told. Keeping the disclosure accurate through closing protects you.
Why a Pre-Listing Inspection Makes Disclosure Easier
A pre-listing inspection gives you documented, professional answers to many of the form's questions, and it removes the guesswork about what you actually know. It also lets you decide which items to repair, which to disclose, and which to price in — the same prioritization that guides which pre-listing work is worth doing.
Common Mistakes Sellers Make With Disclosure
Treating it as boilerplate: sellers who rush the form, or answer 'no' by default, are the ones most likely to face questions later. Take the time to answer each section from your actual experience with the home.
Assuming that disclosing a problem will hurt the sale: in practice, known issues disclosed upfront are far easier to negotiate than issues a buyer's inspector or a later discovery turns into a trust problem. This guide is general information, not legal advice — if a situation is complicated, consult a real estate attorney.
The sellers who come through this process best aren't the ones with the fewest issues — every older Seattle home has some. They're the ones who answer honestly, document what they know, and give buyers no reason to feel surprised.
Seattle Home Selling Guidance
Getting ready to list? Christine can walk you through disclosure and pre-listing preparation so there are no surprises once you're under contract.
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