noun
application for building confirmation
A formal application submitted to a building official or designated confirmation body to verify that a building plan complies with the Building Standards Act before construction starts.
新築工事を始める前に、建築確認申請を提出しなければならない。
Before starting new construction, you must submit an application for building confirmation.
建築確認 is the building confirmation itself (the process or certificate), while 建築確認申請 is the application for that confirmation.
Compound of 建築 (building, architecture), 確認 (confirmation, verification), and 申請 (application).