If you’re swapping out your old countertop for one that’s made from a heavier material, it’s likely that your existing cabinets won’t be able to support the weight without additional work. In this case, you may want to replace your cabinets, although it’s not always a requirement. "When deciding on a new countertop, determine if you want to make any changes to your layout and cabinets,” says Kilborn. “It's a great opportunity to make these changes."