Nick, You ask some good questions. First, most builders pre-treat the soil for pests. You need to ask the builder if he has done this. Second, it is always a good idea to have a good home inspector take a look at any home being sold. On a new home you should not expect problems, but usually there is not a supervisor at the building site every minute watching everything that is done by the workers, etc. and people do make mistakes. It is just a good idea for your protection. This does not reflect on the builder. You have chosen a good builder and he does offer a 1 year builders warranty. Third, the area you are building is not known for radon, but if you have any doubts, it is not expensive to have a radon test done. In general, your concerns are understandable but probably not warranted. If you have a need to know more, there are experts, in all fields of you concern, that would be happy to answer your questions further.
Keller Williams/Hometown Partners, LLC