This publication provides an overview of the current technical and contractual trends that govern the execution of micro-tunneling projects in both Romania and Bulgaria. Technical issues discussed include available equipment and technologies, aspects related to the complexity and challenges of these works, comparisons between the open trench and trenchless methods, environmental impact, and other. Legal issues discussed include contractual schemes, relationship between the parties involved, dispute resolution, and contract types in compliance with both the national as well as the European Union law. Appropriate technical equipment is recommended to avoid risk in implementation and ensure the quality of finished products.