This article presents a critical evaluation of the new Spatial Development Strategy for Northern Ireland. The regional plan is considered in the context of the wider peace process. The exercise drew on assimilationist and pluralist approaches to the divisions within the area. The article argues that, however well intentioned, there have been flaws in the planning process. It is the private housebuilding industry that has been most successful in separating assimilationist and pluralist rhetoric from the core practical reality of housing location issues and thus mobilizing to advance their interests. Lessons are drawn for planning practice in the future.