What should the depth of the footing for a cinder block fence be?

[belbing]

fence will be 6 ft. high.

[homeowners]

You'd normally call this structure a wall, not a fence. Given that it likely requires a permit to erect, is very expensive and if you screw up the footing and it topples, there may be disastrous consequences, are you sure you want to DIY this thing? I am not being dismissive of your masonry skills, and I'm usually all for DIY whenever it makes sense, but this seems like quite an undertaking. Seriously, might want to have a professional mason involved (unless you are one, of course).

Anyway, my crass comment about DIYing the wall aside, how long will the wall be? What kind of soil is this?

[Anonymous]

Of course there are professionals. People should not even fill up their cars without calling a professional. There could be a spark (static electricity), setting the entire gas station on fire, 10 cars explode, people die, the one who failed to call a professional fueler could go to jail, lose everything. I agree: Always call a professional and don't forget to put on your safety goggles before turning on your PC.... the monitor could explode.....