Guide · 2026-10-02

Land boundary survey before buying a house in Japan: 境界未確定, registered vs. surveyed area, and who pays to fix it

Short answer: in Japan the line between your land and the neighbour's is often not where the fence is, and the land area on the listing is often not what is on the ground. On cheap rural houses it is common to see 境界未確定 (boundaries not confirmed) and 公簿売買 (sale based on the registered area) in the contract. Neither stops the sale, but they move the cost and trouble of settling the boundaries from the seller to you. A full boundary-confirmation survey (確定測量) with every neighbour's signature typically costs hundreds of thousands of yen and takes months, so decide before the contract whether the seller does it, you do it, or you accept the risk at a lower price.

Why boundaries are often unclear in Japan

Japan's land records were built from late-19th-century tax surveys. Many parcels have never been precisely measured since. The government's modern cadastral survey programme (地籍調査), which re-measures parcels and produces accurate maps, has covered only around half of the country's surveyable land nationally according to MLIT, with large differences between prefectures and lower coverage in many cities and mountain areas (MLIT cadastral survey site, Japanese). The result, on an old akiya:

• the official map at the legal affairs bureau may be an old 公図 that shows shape and neighbours roughly but not accurate distances;
• the registered area (登記簿面積, 公簿面積) may be larger or smaller than the real area — old rural records were often understated;
• boundary markers (境界標) may be missing, buried, or moved during road works;
• neighbours, often elderly or themselves absentee owners, may not agree where the line is.

The documents to request and what each tells you

Document	Japanese	What it shows
Registry certificate	全部事項証明書（登記事項証明書）	Parcel number, land category and registered area. Check whether the area has been corrected (地積更正) — that usually means a survey was done
Official map	14条地図 or 地図に準ずる図面（公図）	An Article 14 map is an accurate map, usually from the cadastral survey. A 公図 is an older map of lower accuracy. The bureau's copy says which one it is
Survey plan	地積測量図	Filed when the parcel was subdivided or its area corrected. Newer plans list boundary marker types and coordinates; older ones may only give distances. Not every parcel has one
Boundary confirmation documents	境界確認書・筆界確認書	Signed agreements with each neighbour (and with the municipality for the road boundary). The strongest evidence a survey was completed
Road boundary certificate	官民境界確定図 / 道路境界確定	The confirmed line between the lot and a public road. It decides the road frontage — which matters for rebuilding

The registry, maps and survey plans can be obtained from any legal affairs bureau or online through the registration information service. Ask the agent for the boundary confirmation documents; if they say 境界確認書なし (none), you know where you stand.

Three kinds of "boundary" — and why the difference matters

Japanese practice separates:

• 筆界 (hikkai, parcel boundary): the line fixed when the parcel was first registered. Under the Real Property Registration Act it cannot be moved by agreement between neighbours; it can only be found.
• 所有権界 (ownership boundary): the line up to which each person owns land. Neighbours can agree to move this by a transfer of part of a parcel — but then the parcel has to be subdivided and registered.
• 占有界 (the line of actual use): where fences, walls, hedges and gardens actually are.

On an old house the three can differ. A wall that was built 30 cm onto the neighbour's parcel decades ago does not move the parcel boundary, and in some circumstances long possession can give rise to acquisitive prescription claims. These disputes are rare on a quiet rural lot but expensive when they happen, and they block a later sale.

Registered-area sale vs. surveyed-area sale

Contract type	Japanese	What it means for you
Sale by registered area	公簿売買	The price is fixed on the registered area. If a later survey shows less land, there is no price adjustment. Normal for cheap rural houses and large irregular lots
Sale by surveyed area	実測売買	A survey is done (usually by the seller before settlement) and the price is adjusted per square metre for any difference. Normal for urban lots where land is the main value

For a ¥3 million house on a large rural lot, a 公簿売買 with an unconfirmed boundary is often acceptable — the land is not where the value is. It becomes a problem when the lot is narrow, when the road frontage is close to the 2-metre minimum needed to rebuild (see saikenchiku fuka), when you plan to extend or build a new house near the edge, or when a neighbour already disputes the line.

What a boundary survey involves, costs and takes

Boundary work is done by a land and house investigator (土地家屋調査士), a licensed profession that handles surveys and the registration of land and buildings. Their national federation has an English introduction. There are two levels of work:

Survey	Japanese	What you get	Typical scale
As-is survey	現況測量	A measured drawing of the lot as it is, based on existing markers and fences. No neighbour agreement	Days to a few weeks; usually the cheaper option
Boundary-confirmation survey	確定測量	Every boundary confirmed on site with each neighbour (and the road authority where the lot touches a public road), markers set, confirmation documents signed. Can be followed by an area correction in the registry	Commonly one to several months; longer if a public road or river is involved or a neighbour cannot be reached. Price lists from surveyors commonly run to several hundred thousand yen, more where the authorities must attend

Costs depend on the number of neighbours, the lot shape, whether the road boundary needs confirming and whether old records exist. Ask for a written estimate (見積書) before you agree who pays.

If a neighbour refuses or cannot be traced, the next step is the parcel boundary determination system (筆界特定制度) at the legal affairs bureau, created in 2006: an official, after investigation and hearing an outside expert, states where the original parcel boundary is (Ministry of Justice, Japanese). It is cheaper and faster than a lawsuit but still takes many months, and it is the registered owner who applies — so it is a tool for after you buy, not before.

Neighbour rules that changed in 2023

Amendments to the Civil Code that took effect on 1 April 2023 help owners of old houses with absent or unresponsive neighbours:

• Overhanging branches (Art. 233): if a neighbour's branches cross the boundary and the neighbour does not cut them within a reasonable time after being asked, or cannot be found, you may cut them yourself.
• Using the neighbour's land for works (Art. 209): you have a right to use adjoining land to the extent necessary to build, repair or survey near the boundary, with notice.
• Utility lines (Art. 213-2): you may run water, sewer, gas and electricity lines through or connect to facilities on neighbouring land where there is no other way, with notice and compensation.

These make an unconfirmed boundary easier to live with; they do not confirm the boundary.

Contract clauses to ask for

Japanese	English
売主は決済日までに隣地との境界を明示する。	The seller will point out the boundaries with the neighbours by settlement.
売主の負担で確定測量を行い、境界確認書を引き渡す。	The seller will carry out a boundary-confirmation survey at its cost and hand over the confirmation documents.
実測面積と公簿面積に差があった場合、1㎡あたり○円で精算する。	If the surveyed area differs from the registered area, the price is adjusted at ¥___ per m².
越境物の有無と、その取扱いについての覚書を締結する。	Encroachments will be listed and handled in a signed memorandum.

On low-priced akiya, sellers frequently refuse the survey clause and say so in the contract (境界非明示, 測量なし). That is a negotiating point on price, not necessarily a reason to walk away. Read the contract and the important matters explanation for these words; our juyo jiko setsumei guide shows where they appear.

Questions to ask the agent

Japanese	English
境界標は全て現地にありますか。境界確認書はありますか。	Are all the boundary markers in place? Are there signed boundary confirmations?
この地域は地籍調査が済んでいますか。法務局の図面は14条地図ですか、公図ですか。	Has the cadastral survey been done here? Is the bureau's map an Article 14 map or an old 公図?
道路との境界は確定していますか。間口は何メートルですか。	Is the boundary with the road confirmed? How wide is the road frontage?
塀・屋根・樹木・配管などの越境はありますか。	Are there encroachments — walls, eaves, trees, pipes — in either direction?
隣地所有者との間で境界について揉めたことはありますか。	Has there ever been a boundary disagreement with a neighbour?

More questions in both languages: questions to ask the agent before buying.

When an unconfirmed boundary should change your decision

• Large rural lot, house well inside it, no disputes: usually acceptable with a 公簿売買; walk the markers you can find and photograph them.
• Narrow lot or road frontage close to 2 m: ask for at least the road boundary to be confirmed before contract. A few tens of centimetres decide whether you can rebuild.
• You plan to subdivide, sell part, or separate the house from adjoining farmland (see akiya with farmland): a confirmed survey will be needed anyway; negotiate who pays now.
• Existing dispute or a wall clearly on the wrong side: price it heavily or walk away — it will follow you to resale.

FAQ

Is it normal to buy a house in Japan without a boundary survey?

For cheap rural houses, yes. Many are sold on the registered area with no survey and boundaries described as not confirmed. It is a risk you take on, and it should be reflected in the price.

Who pays for the boundary survey, buyer or seller?

There is no fixed rule. In urban sales the seller commonly provides a confirmed survey; in low-priced akiya sales the seller often refuses. Whatever is agreed must be written into the contract.

The land is smaller than the listing says. Can I get money back?

Not if the contract is a 公簿売買 that excludes price adjustment — that is exactly what that wording means. If the contract is a 実測売買 or has an adjustment clause, the difference is settled at the agreed rate per square metre.

Can neighbours agree to move the boundary?

They can agree to transfer land between them, which moves the ownership line, but the original parcel boundary (筆界) cannot be changed by agreement. The transfer requires a subdivision and registration done by professionals.

How long does a boundary confirmation survey take?

Commonly one to several months. It takes longer when a public road or river is involved, when there are many neighbours, or when a neighbour is absent or has died without the inheritance being registered (see inheritance registration).

Related reading

See how to check a house in Japan before buying, retaining walls and cliff ordinances and buying from overseas without visiting, or browse all guides.

Sources: Real Property Registration Act (不動産登記法) on Article 14 maps and the parcel boundary determination system; Civil Code Art. 209, 213-2 and 233 as amended effective 1 April 2023; MLIT cadastral survey progress; Japan Federation of Land and House Investigators' Associations. Survey costs and durations vary widely — obtain a written estimate from a land and house investigator for the specific lot.

This guide is general information based on public sources cited above. It is not legal, tax, or real-estate brokerage advice. Confirm every item for a specific property with the agent, the municipality, and licensed professionals.