How expensive is it to change a vinyl lined pool into a Diamond brite surfaced pool?

Expensive. The dig is probably one of the least expensive parts of the inground pool process. Essentially when you pull the vynal out that is what you have. a hole. You can plan to have the gunite shot in, replumbing, coping and decking. Then the diamon brite plaster is shot at the end. In most markets you can count on approximate costs of over $20,000.