This working paper explores the ‘scaling out’ of community-based adaptation (CBA) pilots, which is defined as ‘more quality benefits to more people over a wider geographical area, more equitably, more quickly, and more lastingly’. Rather than higher-level policy integration, it focuses on how multiple local actors can pilot small-scale innovations and showcase them until their approaches are replicated by multiple local actors, and a particular technology, practice or local regulatory approach becomes widespread. It identifies several key elements which it argues are common to successful cases of scaling out and explores networks and partnerships, documenting evidence and learning, adaptive capacity and institutional channels and finance mechanisms.