This paper aims to clarify the restoration of detached houses after flood events in terms of construction works and costs. We conducted field research in the six regions affected by the floods which included technical surveys asking the builders and the residents what restoration works they performed in 22 houses flooded above the floor. After confirming the three different levels of the works according to the degree of completion, we analyzed what causal relationships the content of the works and the construction costs have with not only the magnitude of the flood but also construction year and building construction methods.
