Depends on the size of the crack, preparation, whether it is
horizontal or vertical, and a few other unknowns.
Basically, the crack must be prepped by cleaning and dust
removal. Then the epoxy is mixed and injected into the crack
in an attempt to fill the voids entirely with the mixture.
This is a structural repair and is designed to bring the wall
back to its original strength.
Lets say that it is easy to get to, there will not be much
cleanup after the repair and the crack is 6' long
horizontally. That repair would cost about $600. You can go
up from there.
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