Plumbing Scope or Nope?

[Melissa Culpepper]

Here's the scenario: 

Relatively new construction (less than 7 years) and the property has several mature trees close to the home. The trees have recently been pruned (this year) but I know that they had been unmanaged for the last 15-20 years as the previous property owner was an out of state company. As I don't know enough about plumbing and new construction, I am unclear as to whether those issues would have been fully dealt with when they rebuilt or is there likely to be some old lines still in use. The previous home on the site had been completely leveled to build a larger one. If you were looking to buy such a property, would you have a plumbing scope done?