In the county, there are about 850 STR permits in use. 

Some of my rentals are grandfathered in, but are in areas where re-building would no longer be permitted. 

They kind of implied that remodel was a path but the permits $$$$ would be way higher as I understand them.

I even reached out to hosts on Airbnb, and one said to call the city planner to get my STR permit. 

SC permits fractional titles but there's stipulations (which I don't know about specifically).Strong fences make good neighbors.

The first third gets eaten up rather quick , ordering materials , permits , dumpster , portable bathroom , etc .

If I rent out three bedrooms at 600 each, that is double what I would be getting.However, it seems that renting out rooms separately isn't permitted unless you actively live there with the property as a primary residence (not sure on this point).

We'd need to pull permits to submeter the property, for example, and my understanding is it'd likely be denied due to not currently being to code.Has anyone ever dealt with this before?

So, I’d dig into the numbers before making a call.Local zoning and code regulations: Converting a multi-family property to a single-family unit might require permits or specific approvals, so check with your local building authority to avoid surprises.

Did you obtain all necessary permits and licenses?