What is the approximate price per foot for a block wall?

Specialty Trades Masonry
1

I mostly see the brown type brick built around new homes.

2

Approximate cost per foot is around $2.50 for 2 square feet.

Labor would be around $100 per foot.

KBA NorthWest Construction

3

$80 a linear foot up to 5 feet high. And this price can vary if you have engineering detail.