崖地の不動産購入時に考慮すべき擁壁と安全性について　Retaining walls and safety considerations when purchasing property on a bluff.

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The Importance of Retaining Walls and Safety to Consider When Buying Property on a Cliff

Dotted around my parents’ home are houses built on quaint masonry cliffs, and these houses are often built on top of masonry that is over two meters high. In hindsight, we can see that those were retaining walls, built in the wisdom of the houses in the complexes to keep the distance between the houses from each other. The presence of these retaining walls is quaint, adds prestige to the impression of the house, and is very important in the safety and maintenance of the land.

Legal Requirements for Retaining Walls and the Need for Maintenance

When a retaining wall exceeds 2 meters, it is a legal requirement to ensure that the retaining wall is properly maintained and that there is a “Certificate of Confirmation (Work)” or “Certificate of Inspection (Work)”. This is essential to reduce the risk of future collapse of the retaining wall and to keep the surrounding area safe.

Of course, if the retaining wall is not a retaining wall and the cliff is more than 2 meters high, there are rules and regulations by the local government, such as allowing a distance of twice the height of the cliff when constructing surrounding houses, or not requiring a distance if a retaining wall is constructed, etc. Please check the legal requirements.

Cliff ordinances and building restrictions

Many communities have cliff ordinances for building houses near cliffs. These ordinances require that buildings be built at a certain distance from the cliff and that topographical risks be taken into account. The cost of building a new retaining wall must also be taken into account, and if there is an existing retaining wall, it is recommended that the structure be checked for safety and maintained as needed.

Regional Characteristics and Safety Measures

It is important to regularly check the strength and condition of retaining walls and ensure proper maintenance, especially in some areas of Tokyo where there are many hills. Even if they appear to be in good condition, their durability may decrease over time.

Conclusion.

When purchasing a property with a bluff or retaining wall, one should take into account not just the aesthetics of the landscape, but also the safety and cost of maintenance. Also, if a cliff with no retaining wall is nearby, a new retaining wall should be constructed or a certain defined distance between it and the building.

Proper risk management and information are key to maintaining a safe and comfortable living environment for many years to come.

Please take a moment to become aware of the topography surrounding the building you are building or have built.

As you can see, when dealing with properties with cliffs or retaining walls, legal requirements and safety must be confirmed, and these points must be understood and handled appropriately.