How much per foot to build a 140 foot 6 feet high cedar fence?

This partly depends on the cost of 6 foot cedar boards where you are, partly on what you charge for labour, and to a lesser degree on just how strong you make this fence. When I did this, I always had 3 2x4 's per panel, and I always used 8 ft, posts concreted in . -That alone adds about a dollar per foot. In my area , Using #1 cedar the material cost is $87 per 8 ft section. so that's $10.87 per foot. If 2 guys are doing it, 140 is about 8 hours work. If you charge 40 per hour for both, that's $320 . -That allows 2.29 per foot. - So total cost is 10.87 + 2.29 = $13.16 per foot. -Naturally this figure may vary considerably with lumber costs in your area,and how much pay you ask.