Decoding the Jutaku Kashi Hoken Seller Disclosure Form

The first time a seller’s agent handed me a stack of disclosure paperwork for a used duplex I was bidding on, I almost skipped the page labeled jutaku kashi hoken (u4f4fu5b85u7455u75b5u4fddu967a, “housing defect insurance”) because it looked like boilerplate. It wasn’t. That single page told me the roof had been reworked eight years earlier under a warranty that still had two years left on it, which saved me roughly 380,000 yen in reroofing costs I’d budgeted for. Over 15 years and 9 properties, I’ve learned that this form is one of the few documents in a Japanese property transaction that actually tells you the truth about a building’s bones u2014 if you know how to read it.

Most buyers glance at the price, the floor plan, and the station distance, then skim past the insurance disclosure like it’s legal filler. It isn’t filler. It’s a paper trail of every structural inspection, warranty claim, and repair the seller is legally required to admit to.

What the Jutaku Kashi Hoken System Actually Covers

Jutaku kashi hoken is defect liability insurance that a builder or seller can carry on a home for a set period after construction or major renovation, typically 5 or 10 years depending on the policy tier. It covers structural defects and water leakage in the two categories the law treats as most serious: load-bearing structure and the roof/exterior walls that keep water out. When a used home was built by a registered builder carrying this coverage, the seller’s disclosure form has to state the policy number, the inspection body that certified it, and the remaining coverage period. I’ve walked away from two properties in the past six years purely because that section was left blank with no explanation u2014 a blank field there is a bigger red flag than a low price is a green one.

The Three Sections I Read Line by Line

The standard form (usually 3 to 4 pages) breaks into sections, but three of them decide whether I make an offer:

• Structural inspection history u2014 dates, inspector name, and whether any defect was flagged and repaired
• Insurance policy status u2014 active, lapsed, or never enrolled, plus the remaining term in months
• Prior claims u2014 any payout made under the policy, which almost always signals a real problem was found and fixed (or not fully fixed)
• Seller’s self-reported known defects u2014 a separate checklist the seller fills out personally, distinct from the insurer’s inspection

That last item matters because it’s the seller’s own word, not a third party’s. I once found a mismatch between the inspector’s clean report and the seller’s own checkbox admitting to a “minor leak, repaired in 2021” under a bathroom. That inconsistency alone got me a 250,000 yen price reduction during negotiation, because it proved the seller knew something the insurance inspection hadn’t caught.

When There’s No Insurance Policy at All

A large share of older used homes here, especially anything built before the year 2000, were never enrolled in this system to begin with u2014 it wasn’t mandatory for existing housing stock, only for new construction after certain reforms. In that case the disclosure form should say “insurance not applicable” rather than leave the field empty. If it’s empty, ask the agent directly. I’ve had agents tell me “oh, that’s just an oversight” on three separate occasions, and every single time it turned out the seller simply hadn’t disclosed something they should have. Don’t accept “oversight” as an answer on a legal document u2014 push for a written explanation before you put down your 5% deposit.

How I Use This Form to Negotiate

Once I’ve read the disclosure form fully, I compare it against my own walkthrough notes. If the form shows no roof work in 12+ years and I see moss or granule loss on the shingles during my inspection, that’s leverage u2014 either the seller reduces the price or covers a portion of reroofing costs in escrow. On a property I bought in 2019, this exact mismatch got the seller to agree to hold back 600,000 yen in an escrow account until I could confirm the roof passed a post-purchase inspection. It did, and I got the money released four months later, but I wouldn’t have known to ask without the disclosure form flagging the gap first.

A Quick Checklist Before You Sign

• Confirm the insurance policy number matches an active registration, not just a certificate photocopy
• Check the remaining coverage term u2014 under 12 months left is basically the same as no coverage for a buyer
• Cross-reference the seller’s self-disclosed defects against your own inspection findings
• If any field is blank, get a written reason from the agent, not a verbal one
• Ask whether the policy is transferable to you as the new owner, since some plans require a re-registration fee, often around 30,000 to 50,000 yen

I’ve closed on properties where this form was clean, boring, and exactly what it appeared to be u2014 and those turned out to be some of my best-performing rentals precisely because nothing was hiding. The form isn’t there to scare you off a purchase; it’s there to tell you which older homes are genuinely well-maintained and which ones just look that way in photos. That’s the approach I use every time I add a tenth property to the portfolio, and it’s saved me from at least two expensive mistakes so far.

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