The construction industry is increasingly focusing on sustainable and eco-friendly building materials to reduce the environmental impact of conventional materials. This study explores the development of lightweight bricks by incorporating coconut leaf ash and building by-products as partial substitutes for traditional raw materials. This study includes other building by-products like fly ash and slag to enhance the physical and mechanical properties of the bricks, while coconut leaf ash, a by-product of agricultural waste, provides an innovative solution for recycling organic waste. The objective of this study is to produce lightweight bricks that meet standard construction requirements while also being more energy-efficient, cost-effective, and environmentally sustainable. This experimental study involves determining the optimal mix proportions of coconut leaf ash and building by-products to achieve desired strength, weight, and durability characteristics. Preliminary results indicate that the incorporation of these alternative materials not only reduces the weight of the bricks but also enhances their thermal insulation properties, making them suitable for a wide range of construction applications. The findings suggest that lightweight bricks made from coconut leaf ash and building by-products offer a viable alternative to traditional bricks, with significant potential for adoption in sustainable construction practices.