This report describes a risk assessment method with an engineering method of fire-safety design for existing buildings. It is composed of an event-tree and simulation systems of burning area and smoke spread, and fire risk is evaluated with expected value of loss. Fire protection measures of existing buildings are evaluated in relation with the building regulations and those amendment. We apply the assessment method to some types of building according to the regulations, constructed in different year. Fire risk decreases in consequence of amendment of the regulations, and existing buildings is classified into 5 from the viewpoint of fire risk.
