This article evaluates the environmental performance of trenchless construction technologies, focusing on TRACTO’s GRUNDOMAT 45 soil displacement hammer, in comparison to traditional open-cut excavation. Part of an ongoing study also covering Horizontal Directional Drilling (HDD) and pipe bursting methods, the analysis applies a cradle-to-gate Life Cycle Assessment (LCA) in line with ISO 14040 and ISO 14044 standards. Environmental impacts are assessed across eight categories. Findings show that trenchless methods, especially the GRUNDOMAT 45, result in notably lower impacts—particularly in global warming potential (GWP) and resource use—due to reduced excavation and material needs. These outcomes align with existing LCA research and support the integration of life cycle thinking in infrastructure planning. The study also reflects how sustainable construction practices can support broader goals such as the European Green Deal and the UN Sustainable Development Goals.