I would not run quartz up the wall at all so not sure why the window has anything to do with this,

Thank you for the quick reply. The sink is near windows which are quite low. The thinner countertop meets with the window handles but the thicker material is problematic since it interferes with opening & closing. The countertop thickness dilemma is only in the window area. Everywhere else in the space is fine.

I prefer the 3cm's chunkiness. Is there any part of your kitchen that includes an overhang for seating? If so, the 2cm quartz may need more support than the 3cm quartz.

The 2cm may get you out of your window dilemma if you install it on cabinets directly with little or no underlayment, but then you may have problems getting your slide-in range to sit on the top because the feet won't go low enough. Pull off your window trim and see how large the shims are at the top; you may gain a 1/2" without too much trouble.

Hi Simstress, there isn't a need for an overhang needed since I don't have an island or seating in the kitchen.

Great point @Joseph Cortlett about the slide in range and the countertop. The trim was removed but due to uneven floors there was lots of shimming to ensure even cabinetry. This raised the cabinets near the window even more than we anticipated. Even looked into changing the windows but its just too costly to do for 1" or 2". The windows are fully functional and in wonderful condition. I do prefer the thickness of 3cm but shaving down near handles concerns me. Will this damage the countertop or make it look weird. This will be done by professionals :)

Hi Ellsworth, the windows are already installed and the cranks definitely interfere (sadly). They are short cranks as small as could find but still hits it upon placing a sample slab under it.

Hi Simstress, thats a great thought and we thought there was clear-way in moving up the windows, but a contractor confirmed there is a header in the way and moving up was not possible. The countertop is offered in both 2cm and 3cm. The pricing for 2cm will be less, yes, but only by $150-$200 less.

Have the plywood roughtops inset into the cabinets, so that the underlayment doesn't give you added height. Usually 2cm material has a built up edge on it, so the thickness on the edge won't be an issue. If you choose a miter edge, you shouldn't see that glue line. 2cm with the plywood underlayment will not be any less durable than 3cm. The only issue would be your stove, as Joseph mentioned. Personally I haven't had an issue with stoves in this application, but always better to check to be sure.

See the higher countertop should be under the window sill ideally, but the countertop is over the window sill (see photo below). The thinner one will meet with the sill. Will this offset the look with the slide-in range?