You already know the drill. Inspector shows up, walks the crawl space, checks the panel, writes a report. If nothing scares the buyer off in that window, you're clear. Right?
Not in North Admiral. Not if your home was built when this ridge was still filling in with Craftsman bungalows and Tudor Revivals in the 1910s through the 1930s, which is most of it. The neighborhood is West Seattle's oldest, and that age shows up less in the inspection report than in what happens two or three weeks after it, when a lender or an insurance underwriter looks at the same house and reaches a very different conclusion than the inspector did.
Where the Deal Actually Breaks
An inspector can see a fill pipe on the side of the house or a porcelain knob in the attic. What an inspector cannot do is confirm whether a buried oil tank still holds oil, or whether the knob-and-tube wiring behind your plaster is ten percent of the house or ninety. Those answers show up later in the process, and by then the buyer has often already waived the inspection contingency.
| Stage | What happens | What it can miss |
|---|---|---|
| Home inspection | Visual walkthrough, flags fill pipes, vent pipes, old fuse boxes, ceramic knobs | Can't confirm a tank without a sweep, can't quantify hidden wiring behind finished walls |
| Insurance application | Buyer applies for a homeowners policy to satisfy the lender | Active knob-and-tube or a known tank can trigger a flat denial here, not at inspection |
| Loan underwriting | Lender requires proof of insurable coverage before funding | A denied or canceled policy can stall financing in the final stretch of escrow |
The practical effect is that a seller who assumes "clean inspection, clear runway" can still watch a deal wobble in the financing contingency, weeks after the part everyone worries about is already behind them.
The Tank Under the Lawn Nobody Mentioned
Homes converted from oil heat before 1970 are the ones most likely to still have a tank in the ground, and Seattle has required decommissioning by law since 1996. If your house predates that and nobody ever filed the paperwork, there's a real chance nothing was ever done about it.
Costs vary by a lot. Decommissioning in place, with no contamination, typically runs $700 to $1,000. Full removal with excavation, still with no contamination, runs $5,000 to $10,000. If the soil comes back contaminated, costs climb to $10,000 to $15,000 for a typical case, and complex scenarios have run past $100,000.
Washington's Pollution Liability Insurance Agency runs a Heating Oil Loan and Grant Program that can help, up to $75,000 per applicant including up to $60,000 toward cleanup. Its most recent cycle ran May 4 through June 18, 2026, so if you're reading this now, that window has closed and it's worth checking with PLIA directly for the next one. That's a separate program from PLIA's older heating oil insurance coverage, which stopped accepting new claims as of July 31, 2025, so don't assume the old safety net is still there.
The NWMLS Form 17 disclosure, the one every Washington seller fills out, asks directly about underground oil tanks and contaminated soils. A "don't know" answer on a pre-1970 house is the kind of thing a buyer's agent will flag and dig into, and the city's own fire marshal database of decommissioning records only goes back to 1996, so an older home with no record isn't necessarily clean, it may just predate the paperwork. Seattle's broader clean heat policy also requires all heating oil tanks to be replaced or decommissioned by 2028, so this isn't a problem that gets easier to ignore over time.
What the Wiring Actually Costs You
Knob-and-tube wiring was standard before 1940, which covers a good share of North Admiral's original housing stock. It has no ground wire, and as Kenneth Gregg, CEO of Orion180 Insurance Services, put it, "the lack of a ground wire is a significant fire hazard." That's not new information. What's changed is how insurers are responding to it in 2026.
Many carriers are now issuing flat denials for homes with active knob-and-tube wiring, and others are requiring replacement within a set window, sometimes as short as 30 days after closing, before coverage even takes effect. That timeline can catch a buyer off guard well after they've already removed their financing contingency, because the insurance conversation often happens in parallel with underwriting rather than up front.
There's a real exception worth knowing. FHA guidelines will accept knob-and-tube wiring as long as it's in good condition and the home carries a minimum of 60 amps of electrical service, and Fannie Mae and Freddie Mac generally follow similar logic on conventional loans. So the wiring itself doesn't automatically disqualify a buyer. The insurance market is often the stricter gatekeeper, more so than the loan itself. Washington's Seller Disclosure Act requires sellers to disclose known material defects, electrical hazards among them, so this isn't something to leave off the paperwork and hope nobody asks.
The Permit Office Changed Names in October
If a side sewer issue turns up during due diligence, and on a ridge full of century-old lots that's not unusual, the process for fixing it changed recently enough that plenty of contractors are still pointing people to the wrong department. As of October 1, 2025, Seattle Public Utilities took over all side sewer permitting, plan review, and inspections from the Seattle Department of Construction and Inspections. If you call SDCI out of habit, you're calling the wrong office.
The technical standards didn't move. The city still requires a 4-inch minimum pipe for a single-family side sewer, a minimum 2 percent grade, and no backfilling before an inspector signs off. What did move is who schedules that inspection and who answers the phone when a permit stalls. A side sewer permit is generally valid for 18 months once issued, which matters if a repair drags past your closing date and you need the window to stay open.
Getting Ahead of It Before You List
None of this means a North Admiral home is hard to sell. It means the paperwork trail matters more than the walkthrough does. A few things worth doing before a buyer's inspector ever sets foot inside:
- Pull your own oil tank history. Check with the fire marshal's decommissioning records and ask if your home has ever had a tank swept for or removed.
- Ask an electrician for a plain answer on how much of the house, if any, still runs on knob-and-tube, rather than waiting for a buyer's inspector to raise it first.
- If you know of a side sewer issue, get the permit conversation started with Seattle Public Utilities early. An 18-month window is generous, but only if you start the clock before you're under contract.
None of this is about panic. It's about making sure the surprise, if there is one, happens on your timeline instead of the buyer's insurance underwriter's.
A Few Questions We Hear Often
Do I have to decommission an oil tank I don't even use anymore? Yes, if it's still in the ground. Seattle has required decommissioning since 1996, and the city's clean heat policy sets a 2028 deadline for every remaining tank to be replaced or decommissioned, whether it's active or long forgotten.
Can I sell a home with knob-and-tube wiring as-is? Often, yes. Disclosure doesn't block a sale on its own, and FHA and conventional guidelines both allow functional knob-and-tube under the right conditions. The harder gate is usually the buyer's insurance company, which in 2026 is pickier than the loan program itself.
Who handles a side sewer permit now that it's not SDCI? Seattle Public Utilities, as of October 1, 2025. If you're mid-repair and someone tells you to call SDCI, that's outdated information.
If you're weighing whether to sell a North Admiral home this year, or you just want a straight answer about what your specific house is carrying, Kelly Zuger has spent years walking these streets and knows which questions to ask before a buyer's underwriter does. Let's connect and figure out where you stand.