@David Boroughes as soon as you start renting out the property, you trigger the "Material Change" clause and the policy can deny claims. 

This case can occur if toxic materials like lead paint, asbestos, etc. used in the previous construction and need to be mitigated.

@Angel Gonzalez Tough situation but I feel for you.

That will be tough.

-----------------------------------------------------------------First things first: What does the building code say about trenchless re-piping, about the materials that can be used for a sewer line, or about relining?

It is tough.

Majority of expenses would be materials after larger hurdle for time.

That might be tough given OP’s price range.

Don't give up even when things get tough and always do your due diligence.

Appraisers are very busy and it can be tough to get one scheduled.