www.mlit.go.jp/jutakukentiku/house/jutakukentiku_house_tk_000028.html

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建築：既存不適格建築物の増築等について - 国土交通省

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https://www.mlit.go.jp/jutakukentiku/house/jutakukentiku_house_tk_000028.html

About this page

This page explains the Ministry of Land, Infrastructure, Transport and Tourism's provisions regarding extensions, reconstructions, major repairs, and major alterations of existing non-conforming buildings under the Building Standards Law Article 86-7. Three main measures are presented: streamlining building confirmation application procedures, relaxing structural regulations for wooden non-conforming buildings (effective September 1, 2009), and recognizing technical guidelines for seismic diagnosis and retrofit of buildings. Detailed information is provided in PDF documents serving as technical advice for prefectures and related organizations.