This study analyzes the types of defects and the relationships of the influencing factors contract system, construction cost, structural system, number of units on each floor, number of stories, unit size, and the shape of floor which cause various defects in Korean APT. houses The results can be summarized as follows; the most defects are found on the floor and the ceiling where water leakage and discoloration appear to be the major defect factors. In addition, repair cost is mainly influenced by structural system, followed by number of units on each floor, construction cost, contract system, etc. As a result, in order to obtain a high quality building, careful attentions must be paid to the factors mentioned earlier.
