This study investigates the effect of facility maintenance practices on employee performance in medium-scale manufacturing firms in Lagos State, Nigeria. Adopting a descriptive survey design, data were collected from 337 employees, selected using Taro Yamane’s formula from a population of 2,132 workers. A structured questionnaire was used as the primary data collection instrument, with a reliability coefficient of 0.82 established through a pilot test. Data were analyzed using descriptive statistics, linear regression, and analysis of variance. The results revealed that regular facility maintenance, proper machinery upkeep, and the provision of safe and functional work environments significantly enhance employee productivity, satisfaction, morale, and overall performance. Regression analysis revealed that facility maintenance practices significantly predicted employee performance (R = 0.173; R² = 0.030; F = 8.061, p < 0.05). These findings underscore the strategic role of facility maintenance as a driver of organizational effectiveness, particularly within resource-constrained environments such as Nigeria. This study recommends that medium-scale manufacturing enterprises institutionalize structured maintenance schedules, integrate facility management into organizational and human resource strategies, and allocate sufficient resources to maintain workplace infrastructure