Sell a House With Termites or Carpenter Ants in Washington
Can you sell a house with termites or carpenter ants in Washington?
Yes. In Washington you can sell a house with termites, carpenter ants, or wood rot as long as you disclose what you know on the Form 17 Seller Disclosure Statement. Most buyer inspection reports only say “possible wood-destroying insects,” because Washington home inspectors aren’t allowed to identify them. A licensed structural pest inspector confirms what you actually have, and then you choose to treat and repair, offer a credit, or sell as-is.
By Samantha Schlegel | October 29, 2026
The inspection report lands in your inbox, and one line stops you cold: “possible presence of wood-destroying insects.” If you’re trying to sell a house with termites or carpenter ants in Washington, that sentence feels like a deal-killer. It usually isn’t. It’s the start of a short, fixable process, and sellers in Shoreline, Edmonds, and Mountlake Terrace who handle it in the right order tend to keep their deals.
Here’s what I tell sellers: confirm what it is, fix the water that caused it, document everything, and disclose honestly. Let’s walk through each step.
Why the inspector only said “possible”
This surprises most sellers. In Washington, a regular home inspector isn’t allowed to identify wood-destroying insects or their damage. The state Department of Agriculture (WSDA) says a home inspector can report on rot and on conditions that invite pests, and can refer you to a licensed pest professional, but can’t say what the insect is, where it is, or how bad the damage is. That’s tied to RCW 18.280.190.
So “possible wood-destroying insects” is the standard, deliberately vague flag. Only a WSDA-licensed structural pest inspector can confirm what you have. That’s good news for you, because the buyer’s report hasn’t actually proven anything yet.
What you probably have in the Seattle area
Not what most people picture. Termites are uncommon in western Washington, and the usual culprits here are moisture-driven. According to Washington State University’s pest resources:
Carpenter ants don’t eat wood. They hollow it out to nest, often in wood that is already damp, and many house infestations are satellite nests fed by a parent nest outside, such as a stump or log. Their mating swarms run roughly April through early June.
Dampwood termites live in wet or rotting wood and don’t nest in dry, sound wood. Finding them usually points to an earlier moisture problem, like wood touching soil. They swarm in late summer or fall, especially after rain.
Subterranean termites are less common here, but they live in the soil and can attack sound wood, and they generally need a chemical treatment once established.
Wood rot (often called dry rot) still needs moisture to start. Leaky gutters, roof or plumbing leaks, poor crawl space ventilation, and wood in contact with the ground are the usual sources.
The pattern is the same across all four: water comes first, pests and rot follow. A report that mentions pests is often really a report about moisture, which is why fixing the source matters as much as treating the bugs.
Step 1: Get a licensed WDO inspection
Hire a licensed structural pest inspector to do a complete wood-destroying organism (WDO) inspection. In Washington, a complete WDO inspection done for a sale, transfer, or refinance has to carry a unique inspection control number, so use a licensed company and keep the report. Costs are typically in the low hundreds of dollars, so get a couple of quotes.
Ask the inspector for three things in writing: what the organism is, whether it’s active, and what conditions are feeding it. That one document replaces the buyer’s vague line with facts. If the answer is “old, inactive damage in a small area,” your negotiation just got much easier.
Step 2: Fix the moisture, then treat and repair
Treatment alone won’t hold if the wood stays wet. Typical fixes include correcting gutters and downspouts, sealing roof or plumbing leaks, clearing wood-to-soil contact, improving crawl space ventilation, and removing stumps, beauty bark, and stored firewood along the foundation.
Published cost guides put small infestation treatments around $250 to $1,200 and large ones around $1,200 to $3,000. Those numbers are for treatment, not repair. The real wildcard is replacing rotted framing, siding, or a damaged sill plate, which can run well past the treatment bill. Get a contractor’s written scope and price for any structural wood before you decide how to respond.
Step 3: Choose your route
Once you know what you have, you have three realistic paths. If you’re weighing repair against price, my as-is or fix-it-first framework applies directly.
Treat and repair before closing. Cleanest path. You hand the buyer a pest company’s invoice or treatment record and a contractor’s repair receipts. Most buyers relax when they see paper.
Offer a credit. If the damage is small or the buyer wants to hire their own contractor, a closing credit often works. I break down when credits beat price cuts in seller concessions in Shoreline.
Sell as-is. Reasonable when damage is extensive, or the budget is tight. Expect a smaller buyer pool and a lower price, since financed buyers often need the issue resolved first.
If the finding comes during the inspection period, your response runs through the inspection notice and response forms. It works much like the options I outlined for a failed sewer scope: repair, credit, price change, or decline, each with its own risks.
What to disclose on Form 17
Washington sellers answer Form 17 based on actual knowledge. Once you’ve had pests or rot confirmed, you know, and the structural questions need honest answers. The form also asks whether a structural pest or whole-house inspection has been done, and when and by whom. If you order a WDO inspection, expect to say so.
Attach what you have: the inspection report, treatment invoice, and repair receipts. A documented, resolved problem reads very differently to a buyer than a vague “yes.” Under RCW 64.06.050, a seller generally isn’t liable for an error in the disclosure that came from a pest inspector’s report, as long as the seller didn’t actually know better. If you learn something new after the buyer has the form, you may need to amend it, and the buyer can get a short window to back out. My full walkthrough is in what Washington sellers must disclose on Form 17.
Will the buyer’s loan or insurance care?
Sometimes. For VA loans, Washington is a state where a pest inspection is generally only required if the appraiser sees a problem or the area has recurring pest issues. FHA appraisers can also flag visible damage, and the lender may then ask for an inspection or repair. Insurance underwriters may also ask about wood damage. Ask the buyer’s lender early whether anything will be required, so it doesn’t surface at the last minute.
Timing matters in Shoreline
Many Shoreline homes date from the 1950s through the 1970s and have crawl spaces and older siding, exactly where moisture and pests like to hide. Ants swarm in spring, which is also peak listing season, so a spring buyer inspection is more likely to catch activity. If you’re planning a spring listing, a WDO check and moisture fixes this winter can turn a surprise into a non-event.
Frequently Asked Questions
Do I have to disclose termites if I already treated them?
Yes. Washington’s Form 17 is based on what you actually know, and past or treated problems are still part of that picture. Disclosing the treatment with an invoice or report usually helps rather than hurts.
Can I sell a house with termite damage as-is in Washington?
Yes. You still have to disclose what you know on Form 17. Selling as-is changes the repair negotiation, not your disclosure duty, and it often narrows your buyer pool and price.
Who can confirm wood-destroying insects in Washington?
A WSDA-licensed structural pest inspector. Washington home inspectors may report rot and conditions that invite pests and refer you onward, but they can’t identify the insects or their damage.
How much does it cost to treat carpenter ants or termites before selling?
Published guides show roughly $250 to $1,200 for small infestations and $1,200 to $3,000 for larger ones, for treatment only. Repairing rotted framing or siding is separate, so get a written contractor scope before you decide how to respond.
Will termites or carpenter ants kill my sale?
Rarely, if you handle them quickly. Most deals survive when the seller confirms the problem, fixes the moisture, and hands the buyer paperwork. Problems escalate when sellers ignore the flag or the damage turns out to be structural.
Where to go from here
To sell a house with termites or carpenter ants in Washington, get the licensed inspection, fix the water, document the work, and disclose what you know. That order protects both your price and your deal. If you’d like help sizing up a pest finding on your own home, or deciding between repair, credit, and as-is, I’m happy to walk through the numbers with you. Reach out anytime.
This post is general information, not legal advice. For questions about your specific situation, check with a Washington real estate attorney.
About Samantha Schlegel
Samantha Schlegel is a residential listing specialist serving Shoreline and the greater Seattle area, with a focus on sellers navigating complex situations like probate, inherited homes, divorce, and relocation. She believes every seller deserves a strategy tailored to their real circumstances, not a one-size-fits-all approach. Samantha works with Compass Real Estate and is known for guiding clients through tough transitions with clarity and care.
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