1 An electric fence can cost $0.05-$0.75 a foot for do-it-yourself installation, depending on the number of strands and whether it's smooth or high tensile wire, or $50-$650 to enclose an acre and $2,700-$4,000 for a mile of electric fence. For do-it-yourselfers, a manual post driver typically costs $20-$50, and can be rented for $10-$20 a day. 2  A powered post driver rents for about $50-$60 a day, depending on location and model. 3  For details, see How Much Does a Fence Post Cost.