Retaining wall cost to remedy backyard slope?
I'm trying to get a rough idea of how much it costs and what's invovled to build a retaining wall and level the ground surface. Below are some measurements - the red color fenced L shape area in picture 3 is the slope from top-down, and picture 1&2 are the side profiles (sorry they're in metric and pic 3 is imperial).
Any suggestions? Thanks!