@ Super B. It is requirement of Baladiya/QCDD that you are a registered engineer here in Qatar before you can endorsed a building plan. It would depend on your specialty/profession. Like in my case, I am a Mechanical Engineer, they require that you submit the mechanical plans of building together with the certificate of the engineer endorsing the plan. It a must if you are working in a consultin office. If you are in contracting company, I don't think that it would be necessary to be a registered engineer.

@Blackbird4 Correct! You need to show your QID in post office and tahey will ask one copy of you ID and you need to fill up and sign a paper.