Big “IF” I did the numbers right, you can build an 8’x8’ block wall for about $230 x 4. You’d have to add more for digging the hole, pouring the slab, roof, steps, door etc. Anyway, it’s cheaper than I thought it’d be.
Concrete Block Calculator
Calculate how many concrete blocks you need for a wall or foundation, and learn how to estimate concrete block and mortar for a project.