This document discusses using semantic web technologies to improve interoperability in the design and construction industry. It describes current interoperability issues and the use of building information modeling (BIM) and industry foundation classes (IFC) for information exchange. It proposes enhancing interoperability through a semantic web approach, including uploading IFC data to an IFC/RDF graph and developing parallel descriptions of building information in different formats like IFC/RDF, AIM/RDF, X3D/RDF, and STL/RDF to allow for querying, reasoning, and other applications. While this semantic web approach could help address interoperability challenges, more work is still needed.