A couple of notes on the plumbing ...
- AAV's (yes, cheater vents is also what we call them around here) eventually leak either water or sewer gases into the home, depending on various factors. The problem is you aren't actually venting the plumbing fixture to the exterior. I've walked into kitchens thinking man this place stinks, sure enough there's an AAV. That install would have been required to have an island loop vent. Actually not hard to do but amazing how many guys screw it up. In this case it probably would have needed to be accommodated within the wall cavity. Which bring up the plumbing inside of exterior walls issue. Under normal construction you aren't supposed to put plumbing pipes inside exterior walls because doing so puts the lines 'outside the thermal envelope'. You can however put plumbing pipes inside of exterior walls if the wall is so constructed to allow for the pipes to remain 'within the thermal envelope'.
Great pics by tjbnwi of a failure situation.
- Running the dishwasher drain line into the garbage disposal poses a cross contamination hazard potential. If the disposal drain line gets clogged, which does happen, sink water and contaminants can down into the dishwasher. You do a load of dishes, the disposal clogs and backs into the dishwasher, you pull a glass out thinking its clean but instead its contaminated and you end up running to the bathroom or hospital.
Theoretically, the dishwasher drain line would be attached at a proper high loop under the sink rim to avoid this. However, it is very rare I see a proper high loop. Most of the time the drain line is lying at the sink base floor and looks disgusting (the clear ones). In the pic this looks like a farm sink install so unless you cut a cavity you aren't going to get a proper high loop to under the sink rim, i.e. under the countertop.
And not we don't go for no lousy romex.
The Codes are not in place because government wants to intrude into your life (they have plenty of other ways to do that). The Code is in place so that when something does go wrong it will hopefully only go sort of wrong instead of horribly wrong resulting in major death or injury. Without building codes those of us on the FOG would most like still build compliant structures or installations. However, without building codes it would be the wild wild west out there for a lot of flippers/developers and we'd be watching ongoing building failures on the news regularly.
I love my work but sometimes I get sick of seeing morons do stupid stuff. Just to be clear that comment is in NO WAY whatsoever directly at this thread.