This deliverable presents the final set of specifications, guidelines, and best practices developed within the CHEK project to improve interoperability between geospatial information systems (GIS) and Building Information Modelling (BIM), with a specific focus on Digital Building Permits (DBP). Building on the results of previous CHEK deliverables, the document consolidates three core technical workflows: GIS to BIM conversion, IFC georeferencing, and BIM to GIS conversion. These workflows are supported by open standards from the Open Geospatial Consortium (OGC) and buildingSMART International, including CityGML, CityJSON, IFC, and related specifications, and are validated through real pilot implementations and iterative testing. The document provides a structured set of recommendations and good practices addressing semantic mapping, georeferencing, levels of detail (LoD), attribute standardisation, validation processes, and compatibility across standard versions. Particular attention is given to ensuring traceability, data quality, and automation readiness in regulatory and administrative contexts. In addition, the deliverable captures insights gathered through dedicated stakeholder workshops and feeds them into the joint OGC–buildingSMART GeoBIM Strategic Roadmap. As such, it serves both as a technical reference for practitioners implementing GeoBIM workflows and as a contribution to ongoing standardisation efforts supporting scalable, interoperable, and transparent digital building permit processes.