Mycelium composites are emerging bio-based materials with potential applications in sustainable construction, particularlyas insulation and other non- or semi-structural components. This study investigates the production of mycelium bricks usingagricultural waste and sawdust as substrates and evaluates their performance through compressive strength, efflorescence, andwater absorption tests. The experimental work involved substrate sterilization, mycelium colonization, moulding, drying and heattreatment. Initial trials showed inadequate hardening; a subsequent trial incorporated 30% white cement to obtain a testable brick.The tested mycelium bricks showed compressive strengths of 12.2, 13.5 and 14.7 N/mm², compared with 7.2, 8.0 and 9.1 N/mm² forthe standard tile brick samples. Water absorption of the mycelium brick was reported as 10.50%, compared with 11.56% for thestandard brick. Efflorescence was slight for the mycelium brick. The results indicate potential for low-weight, waste-derived buildingproducts, while the study also identifies the need for further research on durability, moisture resistance, standardized testing andoptimization of mycelium growth and composition.Keywords: Mycelium composite, mycelium brick, agricultural waste, insulation, compressive strength, water absorption, sustainableconstruction.