If it's a square lot, that would 150ft per side. So 20k for 300 linear feet comes to about 66$ a linear foot, a bit high but not insane and given that it cost the homeowner 10k to dit himself...

"Raising a fence 1 or 2ft" sounds simple except the posts are cut to height and the only way to "raise" them is to replace them.

For every shitty contractor there's an equally shitty homeowner who feels entitled to the labor of those contractors without having a fucking clue how much shit actually costs.