The Purpose of this paper is to describe a decision model which can be used to establish an implementation system of renovation for university building. Any implementation model relies on the work scopes of renovation which varies design, project cost, construction duration. The renovation system is subject to evaluation of work steps which is different from each project. Accordingly, the decision model of renovation is necessary to use the application of the analytical hierarchy process. Many of the performance steps used in general renovation condition may be known with uncertainty. This research has shown how probabilities can be explicitly incorporated in the decision model of renovation to assess this uncertainty.