In this study, we reported a Wireless Sensor Network (WSN) based system for monitoring daily living activities of inhabitant and smart software including novel technique for determining wellness of the inhabitant based on activity usage of household appliances. We defined two new wellness functions to determine the status of the inhabitant in real-time and were able to find out regular character of the inhabitant in a sensor equipped home. Developed intelligent program was tested at four different houses with only single inhabitant. Results of wellness determination are encouraging in deriving habitual behaviour of the inhabitant.