Risk Dictionary › 境界未確認

Boundary Not Confirmed

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What it means

In Japan, land boundaries between neighbouring properties must be formally agreed upon and documented. 境界未確認 means that one or more boundaries of the property have not been officially confirmed with the neighbouring landowner(s). There is no signed boundary agreement (境界確認書) and no confirmed survey markers (境界標) in place.

This is a disclosure item in the 重要事項説明書. It does not mean there is definitely a dispute, but it does mean the exact land area cannot be guaranteed and the issue must be resolved before certain actions can be taken.

Why it matters

• Actual land area may differ from registered area — the 公図 (cadastral map) in Japan is notoriously imprecise in older areas. The real boundary could give you more or less land than the registered area suggests.
• Neighbour disputes — if boundaries were never formally agreed, disagreements can emerge when you try to build a fence, install drainage, or undertake renovation. Resolving boundary disputes can take months and significant legal cost.
• Rebuilding complications — a building permit application typically requires a confirmed survey. 境界未確認 can block or delay the permit process.
• Resale complications — buyers and their banks want confirmed boundaries. Selling without resolving this puts you in the same position as the current seller.
• Survey cost falls on buyer — if the seller will not pay for a boundary survey (確定測量), you may need to absorb this cost (typically ¥300,000–600,000+).

What to confirm before buying

1. Which boundaries are unconfirmed? (All four sides, or just one neighbour?)
2. Is the neighbouring landowner cooperative or in dispute?
3. Who will pay for the 確定測量 (boundary survey)? Can this be a condition of sale?
4. Are there physical boundary markers on site? Are they accurate?
5. What does the 公図 show compared to the registered 地積?

Questions to ask the agent (Japanese)

Official source

Land boundary confirmation is governed by the Land Survey Act (不動産登記法) and related survey regulations. 確定測量 is performed by a licensed 土地家屋調査士 (land and house investigation lawyer). Boundary disputes can be resolved through the Legal Affairs Bureau (法務局) boundary adjudication process.

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