Aim: The Internet of Things (IoT) is playing a vital role in most of the fields all over the world, especially in smart home automation system. The IoT smart home system runs on conventional Wi-Fi network, Bluetooth or Internet to be implemented based on Embedded Microcontroller and sensor environment. Now a days the major crisis in residential premises is the leakage of Liquefied petroleum gas. Due to this hindrance gas sensor can be deployed into the smart home environment and after the detection of gas leakage the SMS (short message service) is sent to authorized user by GSM, then electric power supply is turned off with the help of fire sensor through relay control. After the detection of gas leakage in the smart home, window is opened by means of window sensor and the concentration of gas gets reduced slowly. Hence the survey is done here on the gas leakage detection and controlling system to overcome this trouble. Conclusion: Hence the occurrence of accidents due to the LPG gas leakage is controlled by using the proposed technique which is listed in the possible solution section.