I own several properties in the 38118 zip code (14) and for the most part, it is a great zip code.

Code or zoning violations that are not simple?

It all depends on Code compliance at that particular building.

Won't the city inspect the enclosed porch at that time and likely have me get it to code? 

A QR Code the takes you to a contact form that’s the gateway to the free WiFi is all you need to get data of every guest staying. 

If we do build a Container Home, we plan to build it up to residential code.

when it was built it may not have been required Exposed wiring is not a safety hazard unless its bare wire . and a GFI is easy to replace .S traps were cade at one time , they are not now , but the house only has to be up to what the code was when it was built .Bilco doors , hard to say , but they are about $800 to buy .

There are both pros and cons.Do NOT try to read Section 469 of the IRS code, unless you have tax/legal background.

However, the appraiser says that the stairs are of safety concern, and I need to be rebuild to code.

Septic will depend on your state and local codes.