She said it’s unfair because hairs can pass through the drain cover over time too.

This includes emptying the water heater, draining all of the piping. 

Not to mention hair salons clog drains on a frequent basis. 

The data was showing Letcher county KY has a large population drain. 

But to be more specific, I saw gaps between boards in the flooring, bathtub drains with paint still in them from reglazing/aging, toilets left with feces, and numerous other very odd issues that are not rocket science for basic cosmetic flips that I shouldn't have to point out to an experienced CG or PM.

I can’t tell you the exact price per sf, but generally, I’d pay about 10-20k for just drywall, carpet, doors etc in an unfinished basement, if you have any minor  foundation issues/leak that’s probably another 5-10k adding a bathroom is probably in the 8-10k range maybe a little more if you have no drain stack in the basement, digging down can easily be 50-100k 

Tangibly, this could be a detached or attached space converted, or maybe you find a master down floorplan with other bedrooms upstairs (and that master has a door to the outside and is large enough to add a kitchenette tapping into water and drain from bathroom or kitchen).

We also put "drain tile" in nearly every house we purchased. 

I had a plumber replace all the drain lines at one of my homes.

In my instance, my tenants dishwasher was not completely draining and it took about one week for them to get there.