This paper presents the project SMooHS, Smart Monitoring of Historic Structures, which brings together scientists from 7 countries working to establish a competitive and simple to use monitoring technique based on wireless sensors. The proposal aims to deliver novel structural health monitoring (SHM) systems capable of taking advantage of the reduction of wiring costs typical of wireless sensor networks and at the same time achieving a further cost reduction by e.g. not relying on a centralized communication gateway architecture. Such novel approaches would deliver a “place-and-forget” SHM solution. Although the market offers a large number of different sensors their applicability for long-term monitoring of cultural heritage has not been validated in detail. Especially the long term stability and the reliability of the measured data might be problematic. In order to provide the practitioner in the field of cultural heritage with a tool which goes beyond the mere accumulation of data, but instead provides help in the sense of warnings (e.g. if damaging factors increase) and recommendations for action (e.g. window opening/closing, ventilation on/off, heating on/off, etc.) data fusion and interpretation is implemented within the monitoring system. Three main case studies (located in Berlin - Germany, Schwabisch Gmund - Germany, and Bologna - Italy) are planned to be used to demonstrate and to validate the work that is done in the core work packages. Three test sites (located in Jarash - Jordan, Hebron - West-Bank, Palestine, and Vienna – Austria) serve for method and system enhancement. The proposed wireless system is user friendly, to be used by practitioners in the field, modular (modules for specific questions arising at the object to be monitored and sensor combinations), open source, for maximum transparency and open for extensions and new modules. The modularity and open source concept are most important for making a dynamic tool, which can be updated and broadened continuously with new research results, both from partners within this project team and from other research groups with their special expertise. However, the system needs to be simple taking also the low budget available in many cases for such a system into account.