This article seeks to focus on ‘peacebuilding’ as a construct of peace among groups that have previously been in conflict. This calls for moving beyond peacemaking and conflict resolution to consider the longer-term efforts at establishing sustainable peace. Notwithstanding the longstanding efforts of UNEP’s Post-Conflict and Disaster Management Branch, there has been very limited development of international normative and institutional structures targeting the process of post-conflict sustainable peacebuilding. The article considers how far the current international environmental governance (IEG) regimes are responsive to the specific challenges to post-conflict situations. It seeks to briefly consider four key characteristics of IEG regimes: (i) Ad-hoc and subject specific; (ii) Incremental and facilitative; (iii) Degree of reciprocity; and (iv) Science-based.