A-1 Concrete Leveling operates in Northern Virgina to lift and level concrete, fill voids and provide a long lasting solution to concrete that has subsided or had a void form under it. We work on sidewalks, front or back porches, driveways, walkways, driveways, pool decks, etc. If it's a concrete slab that has settled or has a void underneath it, we can remedy it in most cases.