Oftentimes your finished basement drywall can be left intact providing we do not discover any mold. If mold is discovered in the drywall or framing, it is cut out and removed. We only remove what is necessary.
Look at the images provided for some examples.
Waterproofing repairs to the foundation of a basement bathroom
Basement bathroom after waterproofing repairs
It is sometimes needed to partially open a drywall to waterproof a basement