Many times gutter drains cause settling of your sidewalks and driveway by causing voids under them. If the concrete is still structurally sound, we recommend filling the voids and raising the slabs to the correct elevation by mud jacking. Mud jacking is an affordable alternative to replacing slabs of concrete that are structurally great but need the correct support.
We do not recommend mud jacking without analyzing what has caused the settling because it may be that you mud jack the slab and it settles again because surface water is not directly corrected.
Often mud jacking is done to resolve concerns about sidewalk or driveway elevations that would present a tripping hazard. One amazing thing about mud jacking is that it ensures the proper support underneath your concrete surfaces.