This thought-provoking book examines the socio-legal mechanisms that drive EU constitutional tensions, as well as the role of principles and values in re-directing EU law and policy towards a democratic Social Europe. It addresses the current limits of Social Europe in relation to different areas of EU law, offering a critical assessment of the present status of EU integration. Covering areas such as posting of workers, the right to collective bargaining, political rights and free movement for EU citizens, and asylum policy, chapters provide a cross-disciplinary and policy-oriented treatment of these subjects alongside focused legal analysis. Complementing traditional concepts and methodologies with newly emerged empirical elements, the book exposes the EU's inherent tensions while also offering new perspectives on the ways in which EU constitutional principles, rooted in solidarity, could inform a future Social Europe. Law, Solidarity and the Limits of Social Europe will be a stimulating read for scholars and students of EU law and social policy. It will also be of interest to legal practitioners, policy makers and civil society organisations working in fields related to Social Europe.