Q1-2 Is development of condominiums of 500 square meters or more subject to permission?

The necessity of a development permit is not determined by the area of the land, but by the presence or absence of development activities (changes in land parcels, shapes or quality), so first check for development activities.
In addition, if you submit a prior consultation form (PDF: 11KB) to the person in charge of permission in advance regarding the necessity of a development permit, the processing will be carried out smoothly if there is any doubt at the time of building confirmation application.

Parts to be published in guides on this answer

• Development Activities
  "Guide to Development Permits"-System-Chapter 3 Section 1
• About prior consultation book
  "Guide to Development Permits"-System-Chapter 2

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.