The iLOC ontology is a generic approach for in-house wayfinding and location description supported by Linked Open Data. It enables the integration of various datasets related to buildings and can be used in museums, shopping malls, hospitals, campuses, stadiums, airports, etc. Possible use cases include the description of nearby places, planning routes or finding places with given features, even in emergency situations. iLOC supports three levels of details for a building plan, with increasing complexity and capabilities. Furthermore, routes can be calculated with flexible constraints for users' goals and abilities with standard tools, like SPARQL.