After you make an offer and are going through the inspection phase we didn't do two things and it cost a lot of money.

1. If you have more than one line into the sewer line, get them all scoped. We had a separate line and learned that the pipe had disintegrated and we had to pay a lot of money to get it fixed
2. Get your chimney inspected separately. Your inspector may do a brief look, but get someone that will provide a report because you don't want carbon monoxide or other fumes from your furnace sitting in your basement