Nurlaila et al. 2026. Cost and Time Efficiency of Reinforced-Concrete Column Construction Using Conventional and Ready-Mix Methods: A Case Study of the Nurul Yaqin Mosque Project in Bumi Pajo Village. Local Engineering. 4, 2 (Sep. 2026), 83–88. DOI:https://doi.org/10.59810/lejlace.v4i2.262.