Recommended Post Sizes for Automatic Swing Gates

It is important that posts for swing gates are set firmly in the ground so the gate doesn't drop and drag on a driveway because this will stop the automatic operator from working.  An automatic operator cannot move a gate that is dragging on the ground, it doesn't know that the gate must be lifted to move it like a person would do.

If you have existing posts in good condition but they are bending a little with the weight of the gate, the posts could be braced rather than replaced saving money, time and effort.

... more on installing gate posts for automatic gates 

... more info on bracing posts  

Single Swing Gates or each Side of a Double Swing Gate 

 Graphic of posts sizes for different swinging gates