Technical expertises are required in case of interventions on existing constructions.

Expertise establishes technical assessments of a construction and makes recommendations for its improvement.

The most common is structural technical expertise. It determines the technical condition of the resistance structure for the existing buildings on which interventions are to be made.

And also through the expertise are pointed out remedial measures or structural rehabilitation in the situations where they are necessary.

In case of interventions on existing buildings, technical expertise is mandatory.