Foundation drainage issues may cost upwards of thousands. If you are purchasing a new home without a proper drainage system, you may see cracks or buckles. Moisture will build up within the foundation, resulting in a nasty mold situation.
Having a well-drained foundation is imperative. It will save you from any sort of moisture issues, or foundation drooping, slanting, or even full on collapsing. Without an appropriate drainage system, you are putting your home and family in danger. If you also have any doubt about the foundation whatsoever, contact a professional and have it checked.