Diktio S.A. is registered in the official list of the Hellenic Ministry for the Environment, Physical Planning and Public Works (Reg. No: 585) with certification ("diploma") for the following categories of design works::
01 Regional planning and regulating studies
(B class, 5 units)
02 City and town planning
(E class, 12 units)
06 Building Architectural Studies
(C class, 3 units)
07 Special architectural studies
(D class, 9 units)
10 Transportation Facility Studies
(C class, 3 units)
13 Water Works Studies
(C class, 3 units)
16 Topography studies
(C class, 6 units)
27 Environmental studies
(A class, 1 unit)