Due to increasing energy costs and the importance of the comfort, smart buildings tend to democratize both in new and renovated constructions, based on management systems relying on dedicated networks. Network heterogeneity leads to complex building management systems having to implement all the protocols of the building networks, resulting in low system integration and heavy maintenance efforts. Those building networks offer no common standardized application layer to build applications. To remedy this, we propose in this paper to leverage on the Web-of-Things (WoT) framework, using well-known technologies like HTTP and RESTful APIs. We outline the implementation of a gateway using the principles of the WoT to expose capabilities of the KNX building network asWeb services, allowing a fast integration in management systems.