The purpose of this research is to clarify the specification and evaluation of a factor which affects presumption of an exterior wall refurbishment cycle by using a proportional hazard model. Covariates affecting exterior wall refurbishment were “Lath-mortar” and an “Area”. A Congested area of wooden built-up area has a long refurbishment cycle, and lath-mortar tends to shorten a refurbishment cycle. Moreover, an exterior wall refurbishment cycle will tend to become short if the number of times of repair increases, and it became clear that there is no difference of the refurbishment cycle by a construction age.