The construction sector had long faced structural inefficiencies, especially in warehouse management, where poor layouts and disorganization limited competitiveness despite previous efforts applying Lean practices. This study addressed the urgent challenge of reducing delays, damages, and reprocessing in a Peruvian distributor of construction materials. An integrated model was proposed by combining Systematic Layout Planning with Lean Warehousing tools such as Kanban, standardized work, and FEFO. The approach was validated through Arena simulation, which revealed measurable improvements. The order cycle time fell from 149 to 107 minutes, product damage decreased from 12.40% to 9.02%, and reprocessing dropped from 16.82% to 5.80%. Moreover, the Perfect Order Index rose from 64% to 81%, while annual economic losses were reduced by 27.6%. These outcomes showed that Lean and SLP integration strengthened efficiency and financial sustainability in distribution warehouses. The findings encouraged future research to explore digital integration and broader applications in emerging economies.