The construction industry generates a large volume of waste which distorts the aesthetics of the environment and contributes to the impediments to achieving social, economic and environmental dimensions of sustainability. Construction waste impact project schedule, cost, and derails contractor's profit, leads to claims and disputes. Construction tradespeople who are the frontline workers have a role to play in the waste generation of construction projects irrespective of the level of development of a nation. This study assessed the labour-specific factors influencing construction wastes generation on construction projects in Nigeria. The well-structured questionnaire conveniently administered to construction tradespeople in active construction sites in Port Harcourt was used to gathered data. Garnered data were analysed using the mean item score and Kruskal-Wallis H tests. The study found that the most significant labour-specific factor that influence construction waste generation are workers' mistakes/errors leading to rework, poor attitudes of workers, shortage of skilled workers/use of unskilled, poor workmanship, and lack of experience. The study recommended for the organisation of adequate training to improved workers knowledge and skills needed to execute projects tasks.