Initial inspection is performed before the building and installations are put into operation and represents an important procedure that is a condition for obtaining an occupancy permit.
Periodic inspection verifies the condition of the installation during use. The need, scope and frequency depend on the type of building, installation and applicable regulations and standards.
Inspection after modification verifies the condition of the installation after works have been performed on the installations concerned. When works are performed or installations are modified, the initial inspection document ceases to be valid.