Q1-4 I heard that rebuilding of the retaining wall is not required, is that true?

In Motoichi, we handle some constructions such as rebuilding of retaining wall as thing which does not require permission.
In addition, when applying the handling, please bring drawings etc. to the person in charge of permission and confirm.

Summary of Guides, etc. on this answer

• About construction that does not require permission
  “Guide to Residential Land Development” Part 1, Chapter 2, 3

Contact for inquiries regarding this answer

• Regarding the necessity of permission (the contact in charge of permission)
  Housing and Architecture Bureau Residential Land Examination Department

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