As technology grows every day, everybody wants to use smart devices (phones, lights, appliances, etc.). Nowadays we find that many houses and offices are neither safe nor smart. To overcome this problem, we have proposed a smart and secure office and home system using IoT. The proposed system contains several components, where a single microcontroller will connect and control several components. Our system will sense the environment and will detect movement and also will distinguish whether a human has moved in or out of the sensors. Secondly, when light falls on its resistance decreases and as it senses darkness its resistance becomes high. Next, our system will sense the blockage level in the housing pipelines and give information about the exact blockage point. Finally, it will control the gardening system. This system will monitor and use all the data from the sensors and principally facilitate physically challenged persons to manage all of their home and office devices from one place, and simultaneously saves power as well. © 2021 Institute of Physics Publishing. All rights reserved.