Evidence base commissioned by the Irish Concrete Federation to assess Ireland’s aggregates supply capacity, reserve replenishment rates, and planning system constraints against projected demand for housing and infrastructure through 2040. The report maps permitted reserves against extraction rates and compares both against the construction pipeline emerging from national planning frameworks, finding the supply system under structural pressure at a moment when infrastructure delivery is being prioritised by government policy. A useful country-level case study in how planning system throughput — not physical resource availability — has become the primary constraint on aggregates supply in developed economies.