We use a survey of rural enterprises from Sri Lanka to explore characteristics of the informal non-farm sector and identify obstacles to its expansion and productivity. Value added in this sector amounts to 80% of agricultural GDP participating households’ incomes are significantly higher than those of households who do not participate. Barriers to entry are low and the impact of non-farm development on inequality modest, implying a large potential contribution to growth and poverty reduction. Infrastructure constraints negatively affect new startups, investment in, and productivity of existing enterprises, with small enterprises being particularly affected.