Construction product platforms provide the opportunity to improve productivity in construction projects while maintaining heterogeneity of output. The growing literature on construction product platforms describes how product suppliers develop product platforms either top-down or bottom-up, independently from project delivery. Through a single case study of a consultancy firm, this paper shows how a specialist consultancy firm operating in the construction sector developed their own product platform on projects while iteratively developing and augmenting their delivery capabilities. Distinguishing between activity integration, coordination, and consolidation, the platform development process highlights how vertical and horizontal consolidation of capabilities within the engineering phase of delivery enables early resolution of both product and process specifications. This means that vertical coordination between engineering and manufacturing phases can be managed by a fully specified contract, rather than acquisition. The analysis of the case shows how construction can be more closely aligned with the linear and sequential models found in manufacturing through clarifying and distinguishing the roles of engineering, manufacturing, finishing and sub-assembly.