The Circular Economy (CE) is increasingly recognised as a key strategy for reducing resource consumption, minimising waste, and supporting decarbonisation in the construction sector. However, limited empirical evidence exists regarding how CE approaches are currently understood and prioritised within the Irish construction industry. This study examines the range of CE approaches recognised by stakeholders and evaluates their relative levels of familiarity across the construction lifecycle. A mixed-methods research design was adopted, combining qualitative and quantitative analysis of data collected through a co-creation workshop involving over 40 stakeholders from industry, government, academia, and non-profit organisations. Participants identified CE approaches and assessed their familiarity using a structured three-level scale. The findings reveal a broad spectrum of CE approaches spanning design, construction, operation and maintenance, end-of-life, and cross-cutting lifecycle stages. Stakeholders demonstrate strong familiarity with material-related practices, construction and demolition waste management, sustainable material sourcing, and regulatory frameworks. Moderate familiarity is observed for design-oriented approaches such as modular construction, design for disassembly, and whole-life carbon assessment. In contrast, lifecycle management, operational strategies, advanced digital technologies, material passports, and systems-based approaches remain less familiar and weakly embedded in practice. The results suggest that the Irish construction sector is in a transitional phase, where circularity is primarily associated with material efficiency and compliance-driven activities, while lifecycle integration, digitalisation, and systemic coordination remain underdeveloped. The study highlights the need to strengthen design-for-circularity capabilities, enhance digital infrastructures, and promote lifecycle-oriented and cross-sector approaches to support a more integrated transition towards circular and low-carbon construction in Ireland.