The thickness of the quartz varies that much? Two inches is a lot. I would immediately call my contractor and ask how he is going to fix the problem.

My mistake I meant depth, not thickness. It is not cut straight it gets wider over the 4 feet. I hope I am making myself clear. Sorry.

I would ask for the countertop to be fixed and for the countertop installer to replace the countertop and pay for the plumber. The overhang should be the same, a specific overhang measurement and edge style would usually be written up in your estimate or specs.

You should get what you paid for. The counter can likely be recut to a consistent 3/4" overhang and they pay for the plumber since you saved them the cost of buying and fabricating a whole new counter.

Which method did they use to template it? They've always done mine with laser and it's very accurate.

https://www.nhkitchens.com/templating-granite-quartz-countertops/

Thank you. I will be calling the counter people in the morning. This reno has been a kitchen of mistakes, none on my part, all on the cabinet company. Cabinets and trim missing, extra cabinets delivered that I didn't order. Cabinets had to be re-made in the correct size. I am still waiting for two cabinets that fill the end run next to the fridge. My contractor cut down the wrong-sized ones so he could finish the job. I need the correct ones just for the doors. I waited over three months to get the original cabinet order and have been without a kitchen since the last week of April. I'm tired, and I want my kitchen back. I truly don't understand how they made any money on my order, with the many mistakes they had to correct. I now have a lot of leftover trim and cabinets due to their carelessness.

Eileen, Yes they did use a laser and still got it very wrong.