[ckissick]

I'm a geotechnical engineer. Mudjacking works great. It should work, but having not seen the site, I can't say for certain.

If the driveway is on a thick fill, but the building is on deep piers, the driveway will settle while the building will not. After mudjacking, the soil might continue to settle, and you'll have to repeat the process. But if it's just poorly compacted base rock, the settlement should be finished.

How's the weather been? If you've been having a drought, then expansive soil may have dried out and shrunk, making the slab sink. The building, if built right, won't sink. This is not a likely scenario, but I just thought I'd mention it.