The company is registered in the Public Projects Companies Table of Greece since 1990, having register number 300 and has the following certificates of the Ministry of Environment, Planning and Public Works, according to the Presidential Degree 541/1978.
EMM. G. LIANAKIS S.A. has the following certificates:
Categories of studies we have today
| PROJECT CATEGORY | CLASS | WORK FORCE |
| Surveying Engineering Projects | E | 18 |
| Town Planning Projects | E | 14 |
| Road Planning & Traffic Regulation Projects | C | 5 |
| Environmental Projects | B | 5 |
| Land Use Planning and Regulatory Projects | A | 5 |
| Hydraulic Projects | A | 4 |
| Architectural | A | 3 |
| A | 2 | |
| A | 2 | |
| A | 1 |