• Joyreen Mwende Ngei
• Sylvester Munguti Masu
• Lucy Muthoni Nyabwengi
• David Gidudi Choka
• Absalom Habil Vugigi Lamka

The construction industry is known to grow rapidly in the global landscape, and it plays a pivotal role in Kenya’s economic growth. Yet, it faces persistent challenges related to material wastage, inefficiencies, and environmental degradation. This paper covers the effectiveness of lean construction practices as a strategic approach to managing waste on building sites, using Nairobi City County as a case study. Lean construction, adapted from lean manufacturing, emphasizes value creation, waste elimination, and continuous improvement. Despite its global success in enhancing efficiency and sustainability, its adoption in Kenya remains limited. The study employed a mixed-methods approach, combining quantitative data from structured questionnaires and qualitative insights from interviews and observation checklists. Key findings revealed that while awareness of lean practices was moderate, their implementation remained low, hindered by resistance to change, limited training, and weak regulatory support. Nonetheless, lean practices such as the Last Planner System, 5S site organization, and Just-in-Time delivery have been shown to improve material flow, reduce delays, and enhance productivity when applied. The study concludes that lean construction practices offer a viable solution to Nairobi’s construction waste problem. The findings contribute to the discourse on sustainable construction in Kenya and provide a framework that can be adapted by other urban centres across Africa facing similar challenges.

Awareness, Building sites, Construction waste, Construction, Effectiveness, Waste management, Lean construction practices, Nairobi city county, Sustainable building.

"LEAN CONSTRUCTION AND WASTE MANAGEMENT ON BUILDING SITES IN KENYA – AN ASSESSMENT OF LEAN PRACTICES EFFECTIVENESS IN WASTE REDUCTION.", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.12, Issue 8, page no.b741-b749, August-2025, Available :http://www.jetir.org/papers/JETIR2508195.pdf

"LEAN CONSTRUCTION AND WASTE MANAGEMENT ON BUILDING SITES IN KENYA – AN ASSESSMENT OF LEAN PRACTICES EFFECTIVENESS IN WASTE REDUCTION.", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.12, Issue 8, page no. ppb741-b749, August-2025, Available at : http://www.jetir.org/papers/JETIR2508195.pdf