Hi Brant, and welcome!

Jan's right: no way to budget without far more information, some of which you don't likely have. For example, if the plumbing's all good, that's one thing, but what if some buried lines are leaking or crushed or have ice damage? That means digging. If the pool is concrete or tile, does the surface need fixing? Is it cracked? If the lining is vinyl the issues change yet again. Is the liner good or bad? What about what's under it?

These are just a sample of a few of the questions to answer even before considering regional cost variations (it's pretty expensive here in suburban NJ).

Carl