Internet of things due to its profound capability has been responsible for the innovative transformations in lifestyles of human. We propose a system for the smart office environment using the Internet of things. Our developed system configuration provides a comfort of handling smart office environment using Google Voice Over Protocol and Android-based application. Use of lightweight MQTT protocols, high-frequency RF trans-receivers, Raspberry 2 Z-wave-based long distance controllers makes this system feasibly suitable for wider office areas. For low power consumption, high performance and immediate time-to-time response QoS parameters, the system is equipped with PIR, gas, flame, sound, light, temperature and humidity sensors. We ensure reliable communication with a separate channel for every sensor signals, secured with AES encryption and plug-and-play provisions. Further, mail-based anomaly or emergency alert notification is also incorporated. Finally, we have performed the experiment and also tested the developed system in Android phones and smart wear watch, namely Moto360 Watch. © 2019, Springer Nature Singapore Pte Ltd.