There is increasing awareness and international support for rebuilding states that have gone through conflict. Third-party interventions in bringing peace to countries that have emerged from civil wars have been channeled through a fundamental concept known as liberal peacebuilding. Liberal peacebuilding, even though it faces much criticism, has been a prominent strategy for third-party intervention in post-war countries since the end of the Cold War. This paper deals with the liberal peacebuilding process in Sierra Leone, after its decade-long brutal civil war. The focus lies on Dr Roland Paris' institutionalization before liberalization (IBL) peacebuilding strategy, its strengths and shortcomings, and its contributions to sustaining peace in Sierra Leone since the end of the war in 2002. Arguing that the IBL strategy has helped to maintain peace in Sierra Leone after ten years of civil war, the paper analyzes how peacebuilding has been implemented in post-war Sierra Leone under the six different pillars of the IBL strategy.