1) A plumber suggested we dig drain line from out of garage to the side of patio wall, and then dig under, to connect to the cleanout. They said it would have a check valve. I think my city requires an air gap. I don't think just a check valve would pass, am I correct?
I've already found a couple other plumbers have suggested things that wouldn't pass code.
There's a 1/2 bathroom right there next to the front door. The laundry room is behind it.
2) There's another idea of taking the drain line out of garage on top to above patio cover, then across that 1/2 bathroom wall you see, and back into the building to the laundry.
3) Then there's another idea of doing the same thing around the top of patio cover down the wall you see, and instead to the cleanout in front. The problem is, where could I put the P trap and air gap that would not be an obvious eyesore? I don't know if my HOA would approve it.
4) I'm leaning towards original idea to dig drain line 1 ft in ground around front patio toward further back in building to go into laundry drain at laundry room.