The SI housing, which separates the skeleton and infill, is regarded as a constriction system, which is capable of adjusting to the individual requirements of residents continuously, has drawn considerable attention. And also an evaluation method to quantify the capacity of skeletons is required. This research shows the results on the evaluation of the skeletons operated by specialists. The characteristic items of skeleton were compared with the evaluation, and the influence of each item on the "ease of renovation" was revealed. Using the results, multiple regression analyses were operated, and the evaluation formulas of the capacity of skeletons were proposed.