I'm buying a 2 bedroom house that was built 1949. we will be adding another bedroom in the future. We need to do inspections for closing. It has a septic system. Do we need to get it tested by an engineer to be sure the septic can be expanded if need be or should we just have the minimum required tests done and do the rest later? I am told by some that all septics can be expanded and others that I better pay an engineer to be sure. what do you suggest?