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Are you actually buying a house? Just in that case I’d check how much it would cost to install everything you’ll need. And I’d pick the option that’s most cost effective. Or you can ask for a discount. That’s what happened with my house where the pipes were damaged by tree roots https://bens.plumbing/blog/how-to-get-rid-tree-roots-in-your-sewer-line/ . Old Seattle neighborhood, where it’s a standard situation. Anyway, it’s good if you have a realtor or agent to help you find the best deal. Maybe it really is better to just buy a house and put in all new stuff yourself.