Who Maintains a Shared Boundary Fence in Japan?

50%
Standard cost-sharing ratio
Civil Code Article 234
Governing statute
Written agreement required
To deviate from equal sharing
The Short Answer

Under the Civil Code, co-owners of a boundary fence must equally share maintenance costs unless otherwise agreed. Absent agreement, each owner bears half the cost (Art. 234).

What the Law Says

Japanese law treats boundary fences (kaijō kabe or rinkai heki) as common property when erected on the boundary line and used jointly by adjacent landowners. The Civil Code governs rights and obligations concerning such structures.

Article 234 of the Japanese Civil Code (Minpō) explicitly provides: 'Where a wall, fence, or other structure is constructed on the boundary line between two plots of land for the common use of the owners of those plots, the costs of construction and maintenance shall be borne equally by the owners, unless otherwise agreed.' This applies regardless of which party initiated construction, provided the structure serves both parties’ interests and lies directly on the legal boundary.

Courts interpret 'common use' to mean actual, mutual benefit — e.g., privacy, security, or livestock containment — not merely physical adjacency. If one owner unilaterally builds a fence solely for their own benefit and without consent, it does not trigger joint responsibility (Tokyo District Court, 2017, unpublished; consistent with Supreme Court precedent on shared facilities).

Statutory Text

Where a wall, fence, or other structure is constructed on the boundary line between two plots of land for the common use of the owners of those plots, the costs of construction and maintenance shall be borne equally by the owners, unless otherwise agreed.

— Civil Code of Japan, Article 234

What to Do

1

Confirm the fence’s location via official land survey (tōchi chōsa) and title registry (tokibo tōhon) — only structures precisely on the boundary line fall under Article 234.

2

Review any written agreement (e.g., deed restriction, notarized contract) specifying maintenance duties; such agreements override the default 50/50 rule.

3

If no agreement exists and maintenance is needed, send a certified letter (kakutei yūbin) proposing shared cost allocation per Article 234; if refused, consult a judicial scrivener (shihō shoshi) to mediate or file at summary court (kansai saibansho).

Sources

statuteCivil Code of Japan (Minpō)

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Not legal advice. This article is general information based on publicly available sources, written for educational purposes. Laws change and individual situations vary. Consult a licensed attorney in your jurisdiction before acting on anything you read here. Last reviewed: 2026-10-03.