Smart buildings tend to democratize both in new and renovated constructions aiming at minimizing energy consumption and maximizing comfort. They rely on dedicated networks of sensors and actuators orchestrated by management systems. Those systems tend to migrate from simple reactive control to complex predictive systems using self-learning algorithms requiring access to history data. The underlying building networks are often heterogeneous, leading to complex software systems having to implement all the available protocols and resulting in low system integration and heavy maintenance efforts. Typical building networks offer no common standardized application layer for building applications. This is not only true for data access but also for functionality discovery. They base on specific protocols for each technology, that are requiring expert knowledge when building software applications on top of them. The emerging Web-of-Things (WoT) framework, using well-known technologies like HTTP and RESTful APIs to offer a simple and homogeneous application layer must be considered as a strong candidate for standardization purposes. In this work, we defend the position that the WoT framework is an excellent candidate to elaborate next generation BMS systems, mainly due to the simplicity and universality of the telecommunication and application protocols. Further to this, we investigate the possibility to implement a gateway allowing access to devices connected to KNX and EnOcean networks in a Web-of-Things manner. By taking advantage of the bests practices of the WoT, we show the possibility of a fast integration of KNX in every control system. The elaboration of WoT gateways for EnOcean network presents further challenges that are described in the paper, essentially due to optimization of the underlying communication protocol.