Performance contracting was adopted in tertiary institutions as a tool for accountability and realization of service delivery when it first came into operational in the year2008. However, the Government continues to experience the problem of delays and resistance of putting all its key institutions on performance contracting, most trade unions have come up with raft of demands that should be fulfilled by employers before the advice their members to sign these contracts. Service delivery suffers a great deal in terms of lateness, customer complaints, outright mismanagement of resources and compliance with set budgetary levels. The objective of the study was to examine the influence of performance appraisal on service delivery in TVET institution in the Western Region, Kenya. The study analyzed data by using both descriptive and inferential statistic. The target population constituted 1527 service providers with a sample size of 308 employees from eleven TVET institutions in the seven counties in Western Regions elected through purposive and stratified random sampling. The findings showed that there was a coefficient determination2 =0.359 which is between performance appraisal and service complaints in TVET institutions in western region. The value is statistically significant since it is higher than 0.01 significance level. This implies that when performance appraisals ratings are conducted it minimizes complaints from the service providers. The study recommends that in order to attain a predetermined level of standard of performance in TVET institution in Kenya.