Can an inspector make me re-pipe the house?

[Christine Edwards]

Hi,

I am in the process of rehabbing a home I own.  I had a plumber go over to give me an estimate for converting a half bath to a full bath and he called me back claiming that the plumbing inspector wasn't going to allow him to tie into the type of pipes I have and I was going to have to re-pipe the whole house.  

Is that a possibility?  Can the inspector really make me replace all the pipes in the house?

Thank you in advance for your help.  This is definitely an expense I had not planned for.

Christine