Productivity in the construction sector has experienced a recent growth of 1% on average, which is very low, and this is reflected in economic losses for construction companies and, consequently, low productivity. The main problems that generate these losses are process delays due to unproductive time, construction material losses (referred to as waste) and the lack of total quality in the construction project. Therefore, this research seeks to eliminate or reduce as much as possible the low productivity in a company in the construction sector. For the situational analysis, diagnostic tools such as the Critical to Quality tree, the Ishikawa diagram and the 5 Whys were used. Likewise, the improvement tools applied were Lean Construction, Lean Six Sigma and Total Quality Management. From the results obtained, it was concluded that the improvement in non-productive time was 22%, concrete and steel material losses were mitigated by 5% and quality errors were reduced by 50%. The results were validated by means of a pilot test and the Arena simulator. An economic validation was also conducted using @Risk software, where an NPV of USD 8428, an IRR of 28.6% and a cost-benefit ratio of 2.1 were obtained.