We want, on one hand, to introduce survival analysis techniques for being used in building maintenance and, on the other hand, to apply this methodology for analyzing a large building stock in order to obtain information for maintenance strategies and/or prevention policies. For the time being, building follow-up is based on inspections. Data coming from building inspections are always censored, due to the fact that, at each inspection time, the event of interest is already happened, or not yet. After the analysis of this type of data, durability and hazard functions are derived. The possibilities of this proposal will be illustrated with the analysis of all the buildings façades in Hospitalet de Llobregat, the second most important city in population in Catalonia (Spain).