For cultural and aesthetic reasons, it seems obvious, that sustaining the high quality of historic buildings is a necessity. There are a number of organizations maintaining historic buildings by a monitoring system all over Europe, although there is no published data on the economic advantages of the practice. The aim of our research is to show that besides the cultural and aesthetic arguments, there are sound economic reasons for continuous maintenance. Our study focuses on the costs by comparing the case of regular maintenance, to that of isolated renovation that takes place every 15 or 20 years after a long period of negligence. In our pilot we have monitored six typical historic buildings to identify the economic facts alongside the aesthetic and cultural arguments, in order to clarify the importance of keeping our built heritage in good condition. Keywords historic buildings • continuous maintenance • regular monitoring • cost effectiveness Acknowledgement This work is connected to the scientific programme of the "Development of quality-oriented and harmonized R+D+I strategy and functional model at BME" project. This project is supported by the New Hungary Development Plan

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Maintenance monitoring is an essential task in the field of preservation of historic buildings. The continuously developing IoT-based systems for monitoring already exist in many areas, like the maintenance of complicated mechanical systems or large industrial facilities, but there are only a few examples of the application of such methods in the field of cultural heritage preservation. In this paper, the possible elements and system of an automatized maintenance monitoring network are tested by analyzing the possible options of the survey units and the system to be established in cases of altering circumstances of the investigated site, highlighting the factors which have to be considered in the case of developing a network on-site. Finally, typical application cases were distinguished, and configuration options were suggested for the automated maintenance monitoring systems.