Transit-Oriented Development (TOD) is gaining wide acceptance by many state’s governments in Malaysia due to its potential to create a liveable neighbourhood with enhanced mobility. Therefore,  the present study  to examine criteria that are considered critical for the success of TOD adoptions based on integrated perceptions from residents and retail operators who live nearby or work at the selected northern KTM commuter stations in Malaysia. The data for this study were gathered from a survey on 360 residents who used the Northern KTM commuter train service. Descriptive and inferential technique was performed to analyse the data and produce the findings. The findings of this study shown that there were significant differences in travel behaviour patterns (companions, frequencies, and walking durations) with respect to respondents’ travel purposes. Moreover, it was revealed that land-use diversity and walkable design as important TOD principles that contribute to their quality of life. Besides residents’ perspectives, the present study also considered the retail operators’ viewpoints in estimating the impact of TOD adoption on quality of life. Unlike residents’ perspectives, retail operators’ quality of life was assessed in terms of business performance and business well-being. “Density” principle showed positive impacts on both retailers’ business performance and business well-being. The findings of this research would serve as a base but critical information to direct future National Estate Development Plan.