This thesis describes the problem of assessing the risk of damage from lightning strikes and based on this, results were obtained using the DEHNsupport software package. After the introduction, the second chapter explains the concepts of damage and loss, as well as risk and its components, and provides factors that influence risk components. The third chapter lists the basic guidelines for risk management, which include identifying the object to be protected, the procedure for calculating the necessity and economic justification of protection, and the selection of protective measures. The fourth chapter discusses in detail the assessment of risk components for a building and provides all the formulas necessary for the assessment procedure. The concept of a zone in a building is also introduced and the assessment of risk components in a building with multiple zones is explained. The fifth chapter contains an introduction to the program, as well as the processing of examples using it. The calculation procedure using the aforementioned program is elaborated in detail. After the calculation itself, the economic justification of lightning strike protection as well as protective measures are explained based on the results.