my plumbing project

Hello, im new here. thanks. i've built a small addition with a kitchen and bath on the same floor. over a full basement.

im trying to avoid hiring a pro because i'm poor. here's a diagram i made up showing what i have planned. but i'm not sure and have too little experience to see if there's any problems. it will have to pass inspection.



if anyone is generous enough to examine what i have here and let me know any wrong parts, or advice, please, please, it would be much appreciated. thanks..

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im in pennsylvania, here's an update on the design. i color coded the pipe sizes.

there's not much vertical room to work with, the pipes from the kitchen have to go over or under a huge steel I beam.




here's another real pic of what's going on. so far...

try this...

need some vents

to frodo, thank you. you've been extremely helpful. here's an update on the plans.

i discovered that the sanitary tee connections are too large to fit among the rafters and floor. I found that if i use two elbows with side check connections then the drain pipes from the kitchen and bathroom can fit. but i;m not sure if this is proper or if inspector will pass this. *circled

also i've added a vent to the washer drain that will raise up and re-connect with the main stack going up,

when you tied in the drain above the tub, you cut of its vent.
you can not drain a line into a vent. if you want to plumb it the way you are doing.
you will have to add a vent as shown to the shower/tub

vents for the shower, i can do that. but how about those elbow connectors. can they be used like sanitary tees?

Just curious... are you discharging the sump into your septic?

here's my 3 cents worth

You don't really need that 2 - 90 offset with the side inlet to be 3"
Toilet stack only needs to be 3", 4"is okay. tie the kitchen and shower into the into the toilet stack if it's more convenient. or tie it in with the bathroom sink drain but all that can be 2". Just need to add a vent for the shower and tie it in any where above the flood rim of the sink above.
sink and shower vents can be 1-1\2" if you need to. Toilet needs a 2" vent.

That laundry drain might be an issue . How high off the floor is the trap?