This work addresses networked embedded systems enabling the seam- less interconnection of smart building automations to the Internet and their abstractions as web services. In our approach, such abstractions are used to primarily create a exible, holistic and scalable system and allow external end-users to compose and run their own smart/green building automation application services on top of this system. Towards this direction, in this paper we present a smart building test- bed consisting of several sensor motes and spanning across seven rooms. Our test-bed's design and implementation simultaneously addresses sev- eral corresponding system layers; from hardware interfaces, embedded IPv6 networking and energy balancing routing algorithms to a RESTful architecture and over the web development of sophisticated, smart, green scenarios. In fact, we showcase how IPv6 embedded networking combined with RESTful architectures make the creation of building automation ap- plications as easy as creating any other Internet Web Service.