Quick mkdir question

I need to create a directory called mod and the permissions need to be set for a group and user called webadmin.

Normaly I am logged on as root create the directory and then have to use chgrp and chown to change it from root to webadmin.

BUT

Is there a quick way to make the directory as webadmin so i dont have to change it from root after?

I tried to use mkdir as webadmin and I get permission denied.
Just wondered if there was a quick way?

My understanding is that a user can only create a subdirectory if he has write permissions in the parent directory, so unless webadmin has write permissions in the parent directory, you will have to follow your current procedure.