Selling a House With Knob and Tube Wiring in Washington
Can you sell a house with knob-and-tube wiring in Washington?
Yes - but the wiring itself is rarely what kills the deal. The problem is insurance. Roughly 65 to 70 percent of carriers will either decline a new policy on a home with active knob-and-tube wiring or demand replacement within 30 to 60 days, and a buyer who can't bind homeowners insurance can't close a financed purchase. Your three realistic paths are to rewire before listing, get a licensed electrician's certification letter that satisfies underwriting, or price the work in and market to the buyers who can absorb it.
By Samantha Schlegel | August 31, 2026
Here's the moment that catches Shoreline sellers off guard.
The inspection goes fine. No surprises in the crawlspace, the roof has life left, the sewer scope comes back clean. Then the inspector writes one line about active knob-and-tube wiring in the attic - and eleven days later the buyer terminates. Not because they don't want the house. Because their insurance agent came back with a decline, and without a policy their lender won't fund.
I hear a version of this constantly, and it shows up everywhere sellers go looking for answers — Reddit threads, homeowner forums, electrician boards, and the "people also ask" box under every search for older Seattle-area homes. One seller wrote about losing three separate buyers to the same wiring before they changed strategy. That's the pattern worth understanding before you list, not after.
Shoreline is squarely in the affected zone. The median home here was built in 1968, but about 4% of the housing stock predates 1940, and another 8% went up before 1949 - which covers the entire window when knob and tube was standard practice. In older pockets like Richmond Beach, North City, and Ronald, that share runs higher. If your house was built before about 1950 and hasn't been fully rewired, you should assume there's active knob and tube somewhere until an electrician tells you otherwise.
The Problem Is Insurability, Not Safety
This is the part sellers get backwards, so let me be direct about it.
Knob and tube isn't inherently unsafe. Installed correctly and left undisturbed, it can run for decades. What makes it a transaction killer is that it's ungrounded, it has no modern insulation jacket, and it overheats when someone buries it under blown-in attic insulation - which nearly every owner of a 1940s house has done at some point to cut heating bills.
Insurers price that risk by refusing it. And in Washington right now, they have less appetite than usual. Insurer-initiated nonrenewals in this state climbed 56% between 2021 and 2025, from 11,763 policies to 18,372, and average premiums rose roughly 55% between 2020 and 2025. Carriers are tightening underwriting across the board. A 1946 house with legacy wiring is exactly the file an underwriter declines without a second thought.
The chain reaction is what actually ends the sale:
Buyer's inspection flags active knob and tube
Buyer's insurance agent can't bind a standard policy
Lender won't fund without a hazard insurance binder in file
Financing contingency fails, buyer terminates, earnest money returns
Worth knowing: the loan programs themselves are more flexible than most people assume. Fannie Mae, Freddie Mac, FHA, and VA guidelines all permit knob and tube as long as the system is safe, functional, typical for the area, and supports at least 60 amps of service. What stops the deal isn't the agency guideline - it's the individual underwriter's overlay and, far more often, the insurance carrier standing behind them.
And in a market like this one, buyers have room to walk. Shoreline's median sale price has been running near $800,000 with inventory tight, but a financed buyer who loses their insurance approval doesn't stay and negotiate. They move to the next listing.
What It Actually Costs to Fix
Get real numbers before you decide anything, because the spread is wide and the guesses people make are usually wrong in both directions.
Full rewire, Seattle metro: roughly $8,000 to $15,000 for a typical 1,500 to 2,000 square foot house including permits. Smaller homes aren't automatically cheaper - an 800-square-foot bungalow with plaster walls and no attic access can run $13,000 to $20,000, because the cost driver is access, not square footage.
Panel upgrade: $600 to $4,000 on top, and most pre-1950 houses need one. A 60-amp service won't carry a modern load.
Permits: electrical permits in Washington run through the Department of Labor & Industries, and Shoreline-area electrical permit fees generally land between $75 and $600. Only a licensed electrical contractor can pull them on your behalf.
Drywall, plaster, and paint repair: budget for it separately. Fishing wire through 1940s framing means opening walls, and that repair is almost never in the electrician's bid.
Labor is 60 to 75 percent of the total at $100 to $200 per hour in this market, which is why bids vary so much between contractors. Get three.
The cheapest useful thing you can do costs $100 to $200: a pre-listing electrical inspection. A licensed electrician documents what's actually there - how much knob and tube is live versus abandoned, the panel condition, grounding, and amperage. Sellers routinely find that most of the old wiring was decommissioned during a past remodel and only one or two circuits are still active. That's a $2,000 problem, not a $15,000 one, and you'd never know without looking.
Your Three Options as a Shoreline Seller
1. Rewire before listing. The cleanest path if your equity supports it and you have four to six weeks. You list a fully rewired house, every financed buyer qualifies, and you sell into the deepest possible buyer pool. In a market where well-prepared homes still move quickly, this often returns more than it costs. But it's a real project - walls open, permits pulled, inspections scheduled.
2. Get a certification letter. This is the underused middle path. If an electrician inspects the system and signs a report attesting the wiring is safe for continued use, properly separated from insulation, and adequately grounded at the panel, many carriers will write the policy. Some sellers pair this with decommissioning just the live circuits - a partial fix that costs a fraction of a full rewire and solves the underwriting problem. Ask your electrician specifically for a signed electrical certification, not just an estimate.
3. Disclose, price it in, and target the right buyer. If you'd rather not do the work, you can sell as-is - but you have to be honest with yourself about the buyer pool. You're largely selling to cash buyers, investors, and renovation-loan buyers, and you should expect to concede the repair cost plus a margin, because buyers price uncertainty higher than contractors do. This is the same as-is versus fix-it-first calculation that comes up with any major system, just with financing consequences attached.
One thing that isn't optional in any of these paths: disclosure.
Washington's Form 17 seller disclosure statement runs on an actual knowledge standard under RCW 64.06. You aren't required to investigate, but once you know about active knob and tube - and after a pre-listing inspection, you know - you have to disclose it. An as-is clause is not a defense against a nondisclosure claim. If you're unsure where the line sits, my full breakdown of what Washington sellers must disclose on Form 17 walks through the standard.
The strategic argument for disclosing early is simpler than the legal one, though. A buyer who learns about the wiring in your listing materials prices it into their offer. A buyer who learns about it from an inspector nineteen days in feels ambushed and either renegotiates hard or walks - the same dynamic that plays out when a sewer scope comes back failed mid-contract.
Which option is right depends on numbers I can't guess from here: how much live wiring you actually have, what your equity position looks like, whether your timeline allows a four-week project, and what comparable Shoreline homes are netting right now. That's the conversation to have before the sign goes in the yard.
Frequently Asked Questions
Will a home inspector definitely find knob and tube wiring?
Almost certainly, if it's visible. Inspectors check the attic, basement, and crawlspace, and knob and tube is unmistakable - ceramic knobs and tubes with cloth-sheathed wire running through framing. Assume any competent inspector finds it, which is why concealing it is both futile and a liability.
Can I just leave the abandoned knob and tube in place?
Usually yes, and it's often the practical choice. Abandoned wiring that's been fully disconnected at the panel isn't an insurance problem, but you need documentation proving it's dead. A licensed electrician's letter confirming the circuits are decommissioned is what an underwriter will want to see.
Does knob and tube wiring lower my home's value in Shoreline?
It affects your buyer pool more than your value. Financed buyers who can't get insurance drop out, which reduces competition and, in practice, your final price. Homes with unresolved wiring issues also tend to sit longer, and days on market has its own cost - factor that alongside the other costs of selling a home in Shoreline.
Do I have to rewire the whole house to get a buyer insured?
Not always. Many carriers accept a partial remediation - decommissioning active circuits, separating wiring from insulation, and upgrading the panel - paired with a signed electrical certification. Requirements vary by carrier, so have the buyer's insurance agent confirm what their underwriter needs before you commit to a scope of work.
How long does a full rewire take on a 1940s Shoreline house?
Typically two to four weeks of work once permits are issued, plus scheduling lead time and a final L&I inspection. Add another week or two for drywall and paint repair. Plan on four to six weeks from signed bid to listing-ready.
Knob and tube wiring doesn't have to cost you the sale. It costs sellers the sale when they find out about it the same day their buyer does. Spend $150 on a pre-listing electrical inspection, find out what's actually live, and you'll have real options instead of a fire drill three weeks into escrow.
If you own an older home in Shoreline and you're not sure what's in your walls, I'm happy to walk through what it means for your specific sale - what to fix, what to disclose, and what it's likely to cost you either way. Reach out anytime.
About Samantha Schlegel
Samantha Schlegel is a Shoreline, WA real estate broker with Compass, serving buyers and sellers across Shoreline and North Seattle. She specializes in high-ROI home preparation, strategic pricing, and seamless relocations. Her local expertise covers Shoreline and nearby North King County communities. Whether she is helping sellers prep a mid-century rambler or helping buyers sort out light rail commutes and school boundaries, Samantha delivers data-backed results with local insight.
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