Yes, in most cases, a crack can be repaired from the inside of the house with epoxy or polyurethane injections. Over time we have found that the success rate of exterior repairs with a properly installed membrane exceeds the injection technique. It is far more effective to prevent the water from getting into the interior wall in the first place than to try and stop it once it is already inside. However, in cases when excavation cannot be performed, interior repair may be the only feasible option.