Repair or replace your garage floor
A few thin cracks in a floor that's still flat are normal, and they're usually worth sealing or leaving alone, because tearing out a sound slab buys you very little. When the floor has sunk, broken into loose pieces or tilts so water runs back toward the house, the base underneath has usually given way. Patching the top won't fix what's below, so that's when I'd recommend taking it out and starting over on a packed base.
What shapes the cost of a garage floor
Size comes first, then whether we're breaking out and hauling away an old slab, how much digging and packing the base needs, and whether the job includes reinforcement, a vapor retarder or a new apron. A colored or patterned surface from our decorative concrete work adds to it too. If the budget is tight, please spend on the base before the finish, because the base keeps the floor from settling and nobody can fix it once the slab is down.