This research aims to apply Lean Manufacturing and TOC to increase productivity in a company in the hermetic windows sector. According to the diagnosis made by VSM, the company has a low productivity of 64.47%, identified in the cleaning and assembly processes. To solve the problem of low productivity, the 5 phases of TOC (Theory of constraints) are applied, implementing Lean Manufacturing tools within these phases, which increase productivity and reduce waste and time. We implement these tools to order and organize the operations area, minimizing processing times; on the other hand, the implementation of Standard Work is simulated to reduce process times by eliminating times that do not add value. For the simulation and validation of the proposed solution, the software Arena Version 22 was used, increasing and obtaining productivity of 85%.