An Empirical Analysis of Construction Material Cost Fluctuations and Their Impact on Project Delivery Timelines in Nigeria

This study investigates the empirical relationship between fluctuations in construction material costs and project delivery timelines in Nigeria. Using quantitative data drawn from construction projects executed between 2010 and 2023, the research assesses how material price volatility affects schedule adherence and project efficiency. The analysis employs correlation and multiple regression techniques to model the relationship between material cost fluctuations, macroeconomic instability, and project time performance. The results reveal a strong positive correlation between material cost variability and project delays, confirming that input price instability significantly prolongs project execution. Inflation and exchange rate volatility amplify these effects, while effective project management practices reduce their magnitude. The findings align with the temporal–economic interaction framework developed by Eke et al. (2016–2023), emphasizing the interdependence of time, cost, and behavioural adaptation in production systems. The study concludes with policy recommendations advocating for local material production, monetary stabilization, and adaptive project management to enhance construction efficiency and sustainability.