Overview of Embankment Regulation Law

　On May 27, 2022, the Residential Land Development Regulation Law (hereinafter referred to as the “Old Housing Construction Law”) was drastically revised to protect the lives and bodies of the people from disasters caused by embankments, etc. Regardless of land, forests, etc.), dangerous embankments, etc. are comprehensively regulated based on uniform standards throughout the country, and the "Regulations on Land Development and Specification" Act on the purpose of preventing disasters associated with embankments. (Yokohama City began applying the Embankment Regulation Law on April 1, 2025.)

　As an area to prevent disasters caused by landslide or sediment runoff due to embankment, etc., construction related to residential land development, specific embankment, and debris accumulation in the residential land development restricted area (the entire city) designated by Yokohama City You must obtain the permission of the mayor.

• What is residential land development?…
  Residential land development refers to "change of land characteristics to be performed to make land other than residential land into residential land (fills and cuts over a certain scale)".
• What is a specified embankment?…　
  Specified embankment refers to "change of characteristics of land performed in residential land, farmland, pasture, and forests (fills and cuts over a certain size)".
• What is the accumulation of debris?…　
  Debris accumulation refers to "the accumulation of debris of a certain size or more performed in residential land, farmland, pastures, and forests."
• What is residential land?…
  Residential land refers to "land other than farmland, pastures and forests, and roads, parks, rivers, and other public facilities specified by a Cabinet Order."
  The “residential land” here includes parking lots, tennis courts, graveyards, etc. that do not involve buildings.

　When we perform construction corresponding to any of the following in construction regulation area (the whole city) such as residential land development, we adapt plan of construction to guide-design of embankment regulation law, and permission of the mayor before construction start Must be obtained.
In addition, contents of the development permit performed with the permission of Article 29, Paragraph 1 or Paragraph 2 of the City Planning Act (including those deemed to be the contents pursuant to the provisions of Article 35-2, Paragraph 5 of the Act) Permission is not required for construction related to residential land development that conforms to the above.
[Entry and cut]

• Embankment that forms a "cliff" with a height of more than 1m.
• A cut with a "cliff" with a height of more than 2m.
• When embankment and cut are performed at the same time, a "cliff" with a height of more than 2m is formed.
• Embankment with a height of more than 2m.
• Acts other than the above, where the area of the land to be cut or embankment exceeds 500 m2 (Entry and cuts with a height of 30 cm or less do not enter the area)

[Deposition of debris]

• The height deposited at maximum time is more than 2 meters and the area is more than 300 m2　
• The area deposited at maximum time is more than 500m2 (If the height is less than 30cm, it will not enter the area)

※　A cliff is a land whose surface is at an angle of more than 30 degrees to the horizontal plane and is other than hard rock (excluding those with significant weathering).
※　Basic land (root cutting), which is recognized as an integral construction that is inseparable from the construction of the building itself, does not correspond to Kirimori soil. However, when creating the entire outer periphery of the building, the foundation part of the building shall also be within the range of Kirimori soil.
For more information, please refer to the following website.

　For land that is subject to the regulation of the Embankment Regulation Law or land where the act of the regulation has been performed in the past, an obligation to maintain the land in a safe state at all times (according to the provisions of Article 22, Paragraph 1 of the Act) ), And if it is deemed that there is a high risk of a disaster, it may be subject to recommendations or improvement orders depending on the situation.

For more information, please contact the person in charge.