Defect Liability and Inspection on a Used Condo in Japan

You found a used condo in Tokyo. The price looks reasonable. The view is good. The seller is an individual, not a developer. Before you sign, you need to understand two things: what the seller is legally responsible for after handover, and what an inspection can actually tell you. These two topics decide how much risk you carry for the next ten years.

This article walks through the legal framework, the practical inspection process, and the negotiation points that matter. At RE : public, we see foreign buyers focus heavily on price and overlook these clauses. The risk is asymmetric. A 50,000 yen inspection can flag a 5,000,000 yen problem.

The Legal Framework: From "Hidden Defect" to "Contract Non-Conformity"

Japan reformed its Civil Code (民法) in April 2020. The old concept of "hidden defect liability" (瑕疵担保責任 / kashi tanpo sekinin) was replaced with "contract non-conformity liability" (契約不適合責任 / keiyaku futekigō sekinin). The change is not cosmetic.

Under the old rule, the seller was liable only for defects that were "hidden" — meaning the buyer could not have discovered them with normal care. Under the new rule, the seller is liable when the delivered property does not conform to the contract, regardless of whether the defect was hidden.

What this means for you:

The contract itself is now the reference point. If the contract says "no leaks," and there are leaks, the seller is liable.
You can demand repair, price reduction, damages, or contract cancellation depending on severity.
The burden has shifted slightly in the buyer's favor, but only if the contract is written carefully.

The Liability Period: Two Very Different Worlds

Here is where foreign buyers get caught off guard. The liability period depends entirely on who the seller is.

When the seller is a licensed real estate company (宅建業者):

Minimum liability period of two years from delivery, by law (Building Lots and Buildings Transaction Business Act / 宅地建物取引業法).
This is a floor. It cannot be shortened.

When the seller is an individual (個人):

The liability period is freely negotiable.
In practice, most contracts shorten it to three months, or exclude it entirely.
Older properties (pre-1981 earthquake standard) are often sold "as-is" (現状有姿 / genjō yūshi) with full exclusion.

This is the single most important clause for a foreign buyer to read. If you are buying from an individual and the contract says "seller bears no contract non-conformity liability," you are accepting all risk on day one.

What Counts as a Defect?

The four traditional categories still apply in practice:

Structural defects — cracks in load-bearing walls, foundation issues, inadequate seismic resistance.
Water-related defects — roof leaks, plumbing leaks, water seepage from upper units.
Termite and biological damage — less common in concrete condos, but possible in wooden interior framing.
Psychological and environmental defects (心理的瑕疵 / 環境的瑕疵) — past suicide or death in the unit, nearby nuisance facilities, organized crime offices in the building.

The fourth category is uniquely important in Japan. A unit where a previous occupant died alone and was discovered late is legally a "stigmatized property" (事故物件 / jiko bukken). The Ministry of Land, Infrastructure, Transport and Tourism (国土交通省) issued guidelines in 2021 requiring sellers and brokers to disclose such events for residential transactions, generally for about three years after the incident for natural deaths discovered late, and indefinitely for high-profile cases.

If you are a foreign buyer relying solely on the broker's English summary, ask explicitly: "Is this a 事故物件?" Get the answer in writing.

Why a Home Inspection Is Not Optional

Japan introduced a formal home inspection system called "existing home status investigation" (既存住宅状況調査 / kizon jūtaku jōkyō chōsa) in 2018. Brokers are now required to:

Inform the buyer that an inspection is available.
Introduce a qualified inspector if the buyer requests one.
Disclose whether an inspection has already been performed.

Note the wording. The broker must inform you. They are not required to arrange one, and the cost is yours. Many foreign buyers skip this step because no one pushes it on them.

What a Standard Inspection Covers

A licensed inspector (既存住宅状況調査技術者) performs a non-destructive visual inspection. For a condo unit, the typical scope includes:

Interior walls, ceilings, floors — cracks, unevenness, signs of water damage.
Window frames and balconies — corrosion, sealant degradation.
Plumbing fixtures — visible leaks, water pressure check.
Electrical panel — basic capacity and condition.
Common areas (if accessible) — exterior walls, entrance, parking.

Cost: roughly 50,000 to 80,000 yen for a standard condo unit. Higher for larger units or detailed thermography.

What It Does Not Cover

Inside walls (no destructive testing).
Inside the slab or behind tiles.
Long-term repair fund adequacy of the building.
Future earthquake performance.

The inspection gives you an analysis result, not a guarantee. Treat it as a reference point for negotiation and a baseline record for any future contract non-conformity claim.

The Building Itself: Repair Plan and Reserve Fund

A condo (マンション / manshon) inspection of your unit alone is incomplete. The building's long-term health matters more than the condition of your kitchen.

Before signing, request the following documents from the management association (管理組合):

Long-term repair plan (長期修繕計画) — typically a 30-year forecast.
Repair reserve fund balance (修繕積立金残高) — current accumulated amount.
Recent general meeting minutes (総会議事録) — past 2 to 3 years.
Major repair history (大規模修繕履歴) — exterior wall, roof, plumbing.

Red flags to watch for:

Reserve fund balance significantly below the long-term plan target.
Monthly reserve contribution that has not increased in 15+ years.
Disputes recorded in meeting minutes about leaks, cracks, or assessments.
Postponed major repairs.

The tendency in older buildings (1980s) is for reserve funds to be underfunded relative to the actual cost of the second or third major repair cycle. This translates into special assessments (一時金) or steep monthly increases later. That is your cost, not the seller's.

The 1981 Line and the 2000 Line

Two dates structure earthquake risk in Japanese condos:

June 1, 1981 — the new earthquake standard (新耐震基準) took effect. Buildings designed under the old standard show measurably higher damage rates in major earthquakes.
2000 — further refinement for wooden structures (less relevant for concrete condos but worth knowing).

If the building's construction confirmation date (建築確認日) is before June 1981, you are buying old-standard stock. This is not automatically disqualifying — many such buildings have been retrofitted (耐震補強) — but you need:

Proof of seismic retrofit, or
A seismic diagnosis report (耐震診断), or
A clear price discount reflecting the risk.

Mortgage availability and tax deductions also tighten for old-standard buildings. Confirm with your lender before going deep into negotiation.

Practical Negotiation: What to Ask For

Once you have the inspection report and the building documents, you have leverage. Use it specifically.

On the contract:

Push for at least a 6-month contract non-conformity period when buying from an individual. One year is reasonable in many cases.
List specific items in the contract: "no leaks in plumbing as of delivery date," "air conditioning units functional," etc. Specificity helps you later.
If the seller insists on an "as-is" exclusion, request a corresponding price reduction.

On the inspection findings:

Minor issues (worn sealant, cosmetic cracks) — usually accepted as your cost.
Moderate issues (one-time leak repaired, dated water heater) — request seller repair before delivery, or a price adjustment.
Major issues (active leak, structural cracks, signs of past flooding) — reconsider the purchase or demand significant price reduction.

On the building:

If the reserve fund is underfunded, model the likely special assessment over 10 years and treat it as a hidden cost in your offer.

Insurance: The Backstop You Should Know About

Existing home warranty insurance (既存住宅売買瑕疵保険) is a five-year insurance product that covers structural and waterproofing defects on used homes. It requires an inspection to qualify.

Benefits:

Coverage even if the individual seller's liability period has expired.
Required for some tax benefits on used homes (such as registration tax reduction and certain mortgage deduction conditions).
Typical cost: 30,000 to 70,000 yen for the inspection-plus-insurance package.

For a used condo, this is often worth the cost. It converts an unknown future risk into a fixed present cost. Ask the broker whether the unit qualifies. Not all do — buildings with known issues are excluded.

A Practical Sequence for Foreign Buyers

If you are buying a used condo in Tokyo, the order of operations matters:

Pre-offer: Request building documents (repair plan, reserve fund, minutes). Read them or have someone read them.
Offer accepted, before contract signing: Arrange an independent inspection (既存住宅状況調査). Do not rely only on the broker's recommendation — get a second opinion if the stakes justify it.
At contract review: Read the contract non-conformity clause carefully. Confirm seller type (individual vs. company). Negotiate the period and scope.
Before delivery: Walk through the unit again. Confirm any agreed repairs are done.
At delivery: Document the condition with photos and dated notes. This is your evidence base if a defect appears later.
Post-delivery: Within the liability period, report any defect in writing immediately. Delay weakens your claim.

Common Mistakes We See

Foreign buyers in Tokyo tend to repeat the same patterns:

Trusting verbal assurances from the broker over the written contract.
Skipping the inspection because "the unit looks renovated."
Ignoring the building's reserve fund because the unit price seems fair.
Accepting a three-month liability period without negotiating.
Not asking about 事故物件 history.

Each of these is correctable. None of them are obvious if no one tells you.

This is not investment advice. The final decision is yours. The article above describes general tendencies and analysis frameworks; your specific transaction should be reviewed by a qualified professional familiar with the building, the contract, and your financial situation.

For a second opinion on a specific condo, including a reference estimate and risk analysis: RE : public