Europe exposed: mapping the impacts of EU policies on spatial planning in the Netherlands

National laws, local traditions and practices largely define which spatial planning policies are pursued and how they are carried out. Still, like many other policy areas, an unmistakeable process of Europeanization is underway in planning. On the one hand, informal bottom-up Europeanization is occurring through the increasing interaction between scholars and practitioners and by the growing body of spatial information and analyses available at the European Union (EU) level. On the other hand, formal top-down Europeanization occurs when EU policies – competition, economic development, agriculture, nature protection, air quality, etc. – impact domestic spatial planning systems, policy and practice. In this study, we investigate this second kind of Europeanization, using the case of the Netherlands as an example. Specifically, we construct a map revealing the location of EU sectoral policy using six distinct impact types. We observed that many policies overlap and various inter-sectoral tensions (horizontal coordination) are present. The empirical analysis moreover revealed, in line with recent theoretical literature on multilevel governance, that domestic policies and practices, particularly at the national level, determine the way European policies affect planning. This finding has implications for all member states, but particularly those whose national planning is undergoing fundamental reform.