this waterproofing method is on the decline due to its high cost, destructive nature and the availability of interior basement waterproofing methods, it is arguably the most recommended basement waterproofing repair today. There are several reasons why this is so: From a technical standpoint, exterior basement waterproofing is a relatively simple process; consequently, many contractors other than waterproofing contractors will offer this service when the opportunity arises; External waterproofing (done properly with the best products) protects the foundation from further deterioration; and The high price (always in the $1000s and often in the $10000s) makes this type of work quite lucrative for contractors. The high cost and destructive nature of external excavation and waterproofing is in part responsible for the increased interest in interior basement waterproofing methods. Although there are a few exceptions, internal waterproofing options exist for every type of basement leak and they usually cost alot less than exterior basement waterproofing. Interior wet basement solutions require substantially more skill than exterior excavation and waterproofing; this is because of the complexity of the repair methods. The internal basement waterproofing methods are far more dependent on the foundation type than exterior waterproofing. The most common interior basement waterproofing methods are: In general, internal waterproofing repairs cost 1/2 to 1/3 of the cost of external waterproofing. We have created a tabular listing of available wet basement solutions, and their relative cost, for each foundation type. To view the table simply follow this hyperlink: Basement Waterproofing Methods .