How To Check Land Boundaries In Japan

Kōzu: the shape of the parcel and its neighbors

公図 (kōzu) is a map kept at the Legal Affairs Bureau (法務局) showing the shape of a parcel and how it sits next to the parcels around it. Nearly every registered parcel in Japan appears on one. It is useful for understanding a lot's general shape and which adjoining lot numbers touch it, including any lot number that looks road-shaped. What it does not establish is whether that adjoining strip is a public road recognized under the Building Standards Act (建築基準法) — a distinction that matters a lot in Japan, since a parcel without legally recognized road access can be very difficult to rebuild on. Confirming actual road status means checking the road ledger or designated-road map with the municipality or road authority, not reading it off the 公図 alone.

The important caveat: many 公図 in use today were drawn during a land survey project in the 1870s (明治時代, the Meiji era) and have been updated only where a parcel was later divided or resurveyed. Older ones are not reliably to scale and can be visibly distorted, especially in areas that were farmland or forest at the time. A 公図 tells you the shape and neighbors; it does not by itself guarantee where the boundary sits on the ground.

Chiseki sokuryōzu: the precise, surveyed boundary

地積測量図 (chiseki sokuryōzu) is a different document: a boundary survey diagram filed with the registry by a licensed land and building surveyor (土地家屋調査士, tochi kaoku chōsashi), typically when the parcel was divided from a larger lot, when its registered area was corrected, or when an owner voluntarily commissioned a boundary survey. A recent one, filed under current standards, generally reflects measured coordinates and neighbor sign-off on the boundary. An older filing is a different matter: it may predate modern coordinate requirements and be too imprecise to reproduce the exact boundary on the ground, and its filing does not by itself prove every neighboring owner agreed to the line it shows. Treat a 地積測量図 as more reliable than a bare 公図, but check its filing date and contents rather than assuming any survey on file is an exact, mutually agreed boundary (確定測量図, kakutei sokuryōzu) — that stronger status depends on how and when it was made, not just on its existence.

Not every parcel has a 地積測量図 on file. It is common, especially for older rural land and land that has not changed hands or been subdivided in decades, for none to exist. That does not necessarily mean the boundary was never surveyed or confirmed at all — a cadastral resurvey (地籍調査) or an Article 14 map (14条地図) can cover a parcel even without a parcel-specific 地積測量図, and the seller may hold a private survey or boundary agreement that was never filed with the registry. Worth checking those before assuming a fresh survey is the only way to pin down the line; if none of them exist either, the 公図 is the only shape reference the registry has, and the ground boundary has not been formally confirmed with the neighbors.

Why the registered area can differ from the real area

The registration record (登記事項証明書, touki jiko shomeisho) states a land area (地積) for every parcel, but that figure is only as accurate as the survey it came from. Land registered before modern surveying methods can show an area that does not match what a current measurement would find — a gap Japanese practice calls 縄伸び (nawanobi, the actual area turning out larger than registered) or 縄縮み (nawajijimi, the actual area turning out smaller). This was common enough historically that neither is treated as evidence of fraud on its own, but it does mean the registered figure is not a guarantee of the physical lot size, particularly on land that has never had a modern boundary survey.

Here is the practical workflow for checking a parcel's boundaries before you commit to land in Japan:

1. Confirm the lot number and location. Locate the parcel by address or lot number, the way you would start any property research. Our lot number search covers this step.
2. Order the 公図 for the parcel. On Japan Property Research, request the parcel map alongside the land registration record. This shows the parcel's shape, its lot-number neighbors, and its road frontage.
3. Check whether a 地積測量図 exists, and how recent it is. Not every parcel has one. A recent filing is the more reliable boundary reference; an older one may be too imprecise to pin down the exact line. If none exists for the parcel, also ask whether a cadastral resurvey (地籍調査) or Article 14 map (14条地図) covers the area, or whether the seller holds a private survey — any of these can mean the boundary was confirmed even without a parcel-specific 地積測量図 on file.
4. Compare the registered area to what you can observe. If the lot has visible fences, walls, or boundary markers, compare their apparent extent to the registered shape and area. A significant mismatch is worth raising with the seller or agent before you go further.
5. Ask about boundary markers and neighbor agreement directly. For older land or land without a 地積測量図, ask the seller or agent whether physical boundary markers (境界標) are present on site and whether the boundary has ever been confirmed in writing with the neighbors. If not, and the deal depends on the exact boundary (for example, you plan to rebuild up to the property line), a fresh boundary survey by a licensed surveyor is a separate step outside what the registry itself can confirm.

The most common mistake is assuming a 公図 is drawn to scale and treating it as a precise survey when it is not. The second most common is skipping the boundary question entirely on land that looks fenced and settled, when the registry has no survey on file and the fence itself may not sit exactly on the registered line.

What you need to provide is the property address or lot number. From there:

• Land registration record: ¥1,500, states the registered area (地積) and ownership.
• Official parcel map (公図): +¥500, shows the parcel's shape and its neighbors (included on Pro and Team plans).

A few honest caveats. Japan Property Research retrieves the 公図 and the registration record; it does not commission a new boundary survey. If a parcel has no 地積測量図 on file, none exists to retrieve — a fresh one would require hiring a licensed land and building surveyor to walk the site with the neighboring owners, which is a separate professional process outside the registry. The 公図 itself, especially for older or rural parcels, is a shape and adjacency reference rather than a guarantee of exact boundary position. Our Japan property due diligence checklist covers where a boundary check fits alongside the other checks on a property, and our akiya guide covers why boundary questions come up especially often on older, long-held land.

FAQ

What is the difference between 公図 and 地積測量図? 公図 (kōzu) is a general cadastral map showing a parcel's shape and its neighbors; almost every parcel has one, but older versions are not reliably to scale. 地積測量図 (chiseki sokuryōzu) is a precise, surveyed boundary map with measured coordinates, filed by a licensed surveyor — but it only exists for a parcel if one was filed, which is not the case for all land.

Does every property in Japan have a surveyed boundary on file? No. Many parcels, especially older or long-held rural land, have only a 公図 and no 地積測量図. In that case the boundary has never been formally surveyed and confirmed with the neighboring owners.

Why doesn't the registered land area match the actual size? Older surveys used less precise methods than are available today, so the registered area (地積) can differ from a current measurement. This gap is called 縄伸び (actual larger than registered) or 縄縮み (actual smaller than registered), and it is common enough on older land that it is not, by itself, unusual.

Can foreigners order a 公図 or registration record in Japan? Yes. Both are public documents, with no nationality or residency requirement to request one.

Do I need a new boundary survey before buying land? It depends on the plan for the property. If you intend to rebuild close to the property line or the existing boundary looks unclear or disputed, commissioning a fresh survey from a licensed land and building surveyor is worth the cost. For land you are simply evaluating, checking the 公図 and any existing 地積測量図 is usually the right first step.

Related guides:

• What Is Touki In Japan
• How To Find A Lot Number In Japan
• How To Order A Japan Property Registration Record In English
• Japan Property Due Diligence Checklist
• Akiya Guide For Foreign Buyers In Japan