Sensor networks consist of a large number of sensor nodes performing distributed sensing and event detection. As sensor nodes are energy-constrained, energy-efficient routing is essential for increasing the lifetime of sensor networks. This paper proposes a new extended hierarchical routing protocol for clustered networks wherein sensor nodes and cluster heads are chained in a binary form. Chain-based binary form reduces computational overhead of cluster heads. It also decreases delay cost for each packet transmission. On the other hand, clustering structure in network can reduce energy cost compared with tree structure. Experimental results show lower delay cost of O(Log(N)) compared to the delay cost of O(N) in the LEACH hierarchical protocol.