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Abstract. During the use of buildings it becomes necessary to carry out repair works including modernisation. Deciding on the choice of repair solutions is a difficult and complex task. Building administrators have to consider both, the benefits of some repair works, and limitations due to the availability of funds. Selection of a repair solution, bearing in mind the above, requires a comprehensive approach that will allow assessment of the building condition and determining the repair scope required. the research conducted by the authors was aimed at developing a decision-making model and its computer-aided implementation, taking into account a number of operating demands. the system algorithm proposed comprises five stages including: building condition assessment, building use value evaluation, repair classification, multiple variants of repair and the choice of repair solutions. the article describes individual stages of the model in detail, giving numerical application examples of the method for repair solution choice for five multi-family houses.

Abstract. The problem of multi-family building maintenance is complex and comprises numerous issues, one of which is the process of planning expenditures for residential building renovation. This task is important from the manager's point of view as their responsibility is to maintain a building in a non-deteriorated condition. To fulfil this task, the authors of this paper suggest utilising a decisionmaking model aimed at defining renovation activities making it possible to retain the maintenance standard (as regards newly commissioned residential buildings) or improve it (as regards existing buildings). The suggested model is based on a multi-criteria building assessment including seven requirements. The calculations conducted using the suggested model enable us to define the costs and scope of renovation taken to ensure the assumed building condition or, by assuming various rates paid to the renovation reserve, to define the period in which the above-mentioned goals may be achieved.

The aim of the research is to develop a model to support renovation and modernization decisions in the process of maintaining public buildings. The scope of the research includes, first of all, the development of a method of building assessment on the basis of many criteria, applied also in the evaluation of residential buildings, but also specific ones, related to public utility facilities, i.e.: environmental compatibility of buildings, adaptation to the elderly and disabled, fire safety. On the basis of this assessment, a set of proposed renovation and modernisation measures will be determined. In the next stage, knowledge will be acquired from experts (including property managers), who will indicate the ranges of criteria values for the adopted assessments of building utility value. This knowledge will be used to build a rules base of fuzzy inference system for assessing building utility value. The next stage of research will be conducting computer simulations with the use of a mathematical model assessing the impact of the above mentioned decisions on the increase in the building utility value and the renovation cost and modernization activities. All calculations will be carried out in the Matlab Simulink environment with the use of optimization and fuzzy methods. Knowledge of the relationship between decisions on the scope of renovation and modernization solutions and the quality measures of the maintenance process is the basis for decisions in the area of buildings maintenance. The results of these studies can contribute to improving the quality of maintenance of public buildings.

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