One question is, in your area, would your new build (except for foundation) be considered a 2012 build, or a 1965 build (or whatever age the foundation is). In my area, if you keep the foundation, but build new, the house is considered the age of the foundation for all real estate purposes... So, someone looking for a house built in the last 10 years, wouldn't find yours on the MLS.
Sewer smell in house from loose or ill-fitted sewer trap plugs. The most common source of a sewer smell in house is from missing, ill-fitted, or loose sewer trap plugs. The sewer access pit is the first place to check, and maybe the last place most people look. In the bottom of most access pits in a basement is the house trap.
Here are some of the common places in your house where septic system odors spew out: 1. Leaks in sewer piping joints. Of course, it is a given that if the sewer pipe joints have leaks or are not even attached to the floor, ceiling, or wall, you will have septic odors floating about.