Outline of the Regulation Law on the Development of Old Residential Lands

The aim is to protect the lives and property of the people and contribute to public welfare by implementing necessary regulations to prevent disasters caused by the outflow of landslide or earth and sand accompanying the development of residential land.
※The "Regulation Law for Residential Land Development" was revised, and the "Regulation Law for Residential Land Development and Specific Embankment (Entry Regulation Law)" was enforced on May 26, 2023. . In Yokohama City, the application of the Embankment Regulation Law will begin on April 1, 2025. Therefore, permission application of construction about residential land development after April 1, 2025 becomes permission application of embankment regulation law.
Click here for details ➡ Overview of Embankment Regulation Law

When we perform construction about residential land development in residential land development construction regulation area that Yokohama-shi appointed as city area where disaster may occur or area going to become city area, we must receive permission of the mayor.

• What is residential land development?…
  Residential land development refers to "change of character of land to perform to make land other than residential land residential land or residential land".
• 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 residential land development construction regulation area, we must conform plan of construction to residential land development technical standard-design edition ... and must receive permission of the mayor before construction start Hmm.
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 according to the provisions of Article 35-2, Paragraph 5 of the Act) Construction related to residential land development that conforms to the above does not require permission.

• In the case of cuts, a cliff with a height of more than 2 meters is formed on that part.
• In the case of embankment, there is a "cliff" with a height of more than 1 meter in that part.
• When cutting and embankment are performed at the same time, a "cliff" with a height of 1 meter or less occurs in the embankment, and a "cliff" with a height of more than 2 meters is formed in the part where the cut and embankment were performed. What you can do.
• Acts other than the above, with an area of cut or embankment more than 500 square meters

※　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 details, see "Construction requiring Permission" (:) Please take a look.

The owners of residential land within the restricted residential land development area have a duty to maintain a safe state at all times to prevent disasters such as landslide.
In addition, the mayor may make recommendation or improvement order to owners of residential land for prevention of disaster.
In addition, in Yokohama building information center (city hall the second floor), we can read house map (each ward version) which listed the position of residential land development construction restricted area and the situation such as permission of construction about residential land development.

For specific details in a specific location, please contact the person in charge of each area.