Double Sink Island w/ Dishwasher Clog

Hi all,

My dishwasher has been backing up into my double sink. I have a garburator as well as an instant hot water unit plumped in under the sink. There is also an air vent straight up from the main pipe. I have checked and cleaned both p-traps. Draining my dishwater results in back-up into both sinks, sinks drain into the dishwasher which leads me to believe the plug is beneath the "floor". Bought a manual drain snake and cleared a plug probably a foot below the floor. Now I'm running into something a little harder which tells me I've either run into a T or something that my Rona snake can't penetrate. My home is 3 years old (if it matters).

My assumption now is that it IS time to call a plumber. Am I wrong and is there something else I can try prior to that? I am mechanically savvy (speaking relatively) with some trades and oilfield related work, also have whatever tools or willing to buy whatever is required within reason.

Thank you for your time.

 

Try a better snake or call a plumber.

 

Without seeing what is there we can only guess. Where I am, houses have basements or crawl spaces where the drain cleanouts can be accessed below,