Refurbishment sector is becoming one of the most important sectors in the construction industry. In many developed countries, refurbishment sector contributes nearly half of the construction industry output. In Malaysia, 22 percent of construction output was related to refurbishment works in 2015. However, refurbishment projects are more uncertain than new-build projects. Thus, inter-organizational conflicts are likely to happen, due to the uncertainty and the involvement of many organizations in building refurbishment projects. This suggests that refurbishment projects require inter-organizational integration to reduce the inter-organizational conflict. Therefore, the aim of this study is to develop an inter-organizational integration framework to reduce inter-organizational conflict in building refurbishment projects in Malaysia. This aim is achieved through the following four objectives: (1) to measure the level of uncertainty in building refurbishment projects; (2) to measure the level of inter-organizational conflict in building refurbishment projects; (3) to measure the degree of inter-organizational integration in building refurbishment projects; and (4) to investigate the relationship between uncertainty and inter-organizational conflict and inter-organizational integration as a mediator in building refurbishment projects. The respondents of this study are boundary role persons who represent construction or architectural firms in dealing with other organizations in building refurbishment projects (e.g., project managers, architects, contract managers) from construction and architectural firms in Malaysia