Most cases I would suggest that you waterproof the basement yourself. However, there is one specific time when it is extremely smart to hire a basement waterproofing contractor. This is when there’s too much water pressure on the outside of your basement walls.

This is because it is not as simple as patching and sealing the holes that leak water. There’s too much water pressure — it will break through that patch and sealant, and you are right back where you started. There are sophisticated methods to alleviating the water pressure on those walls that are best left in the hands of a professional.