The construction sector has long been underrepresented in business historical studies and debates. While an application of the “historical alternatives to mass production” approach has provided a valuable conceptual framework, this paper offers a still-needed quantitative basis to assess actual long-term changes and continuities in the forms of business organization and entrepreneurship in construction. A database of c. 16,700 construction enterprises in Brussels between 1830 and 1970, drawn from trade directories and fiscal registers, uncovers evolutions in sectoral and subsectoral numbers of enterprises, firm sizes, and rates of company formation. Thus, the growing divergence at the core of the construction industry becomes clear. Industrialization and urbanization led to market concentration, firm growth, and incorporation with some capital-intensive enterprises, whereas the variability of the work on the construction site resulted, with many others, in the persistence of labor-intensive processes, and small-scale, flexible, and informal forms of business organization.

After more than a century of political and economic integration, Southern Ireland exited the United Kingdom in 1922. By identifying the leading business firms of the era and the political and religious allegiances of their owners, this paper explores the perspective of the Southern Irish business establishment on the issues involved. While the mass of the population was Catholic and by 1918 favored secession, the business elite is shown to have been predominantly Protestant and strongly supportive of continued integration. Business elite perceptions of the consequences of exiting the United Kingdom are explored, and post-independence economic and business developments assessed in light of the concerns expressed at the time. The paper also charts the post-independence fate of the leading former unionist firms and the erosion and eventual disappearance of the sectarian divisions then prevalent in Irish business life.