However, there is a commercial duct running behind my bedroom wall that I strongly suspect is being used in violation of the building code.

@Ian BruesehoffGive them like $25,000 for their guru course and they give you the super secret code

Internal Revenue Code Section 1031.

I can't imagine changing codes every guest.  

I believe that under a standard title insurance policy, building code matters, zoning and other governmental restriction on the use of the property are excluded from coverage so unless you purchased an extended form title policy there probably is no coverage, but it never hurts to submit a claim. 

I was considering getting just SIP panels from china, and reputed SIP panel companies in china says they do not ship electricals and plumbing as local codes monitor them closely.

It just makes the HO responsible for all work done to meet code. 

Think of the IRS code as a behavior incentivizer.  

These are professionals with additional training and a stricter code of ethics.

One thing I would definitely invest in is a cheap code lock, so you can change it and not have to meet the guests there.