I'm assuming the top edge of the tile on the rest of the backsplash is ok........and that the gap appears only under the window? My previous home had a similar window and the installer covered the 'sill' (which was drywall) and the sides of the window opening with the same material as the backsplash. IOW, the granite wrapped around the lower section of the window so that the backspash was the same height across the whole length of cabinets. I can see why the installer wants to use bullnose since this will give a more professional finish. Would he use bullnose across the full width of the backsplash?

Twinsmom, in all likelihood your switch box is mounted to a stud on one side or another, probably its right. How about opening the drywall and moving the box to the next stud over--either over the counter or by the door framing, depending on what works? As long as there's not something else filling the potential positions, it's an easy job for a handyman, done in an hour or two and ready for tiling and a little sanding and repainting.

I appreciate everyone trying to help me out to make sure we are safe but your dimensions are all off. I had mentioned some in an earlier post but perhaps you missed them. Math doesn't lie, but your brain can deceive you with size perception (sorry I am a vision scientist so I had to throw that in). The center of the arch is in fact 66" from the floor. I measured it. I am not making it up. We do have 9' ceilings which is why maybe your perception of the size is fooling you. Also the cabinets are not standard. They are completely custom, not just the faces but the actual boxes too. They are higher than 18" above the counter- the wood on the side of the hood that protrudes below the cabinets is at 18" and as you can see in the pic, the cabinets are above that by a few more inches). Also the cabinets aren't standard depth, they are 15", which again might be throwing the perception of the size off. I am pretty tall and when I lean forward over the cooktop, my head does not hit the hood at all. I don't know how hoods and measurements work but the wood casing around the hood that you see is not over any burners at all (so even the lowest areas of the arch that are closer to 64" are in front of the cooktop and not over it). The actual inside of the hood, in the area right above all of the burners, has a clearance that is a bit over 66". The house is new construction so it did have many inspections, and passed them all. I am hoping this is all proper and safe now that the dimensions are clarified. We worked with a kitchen designer through the custom cabinet builder. We did not do the backsplash at the time as we were rushing to move in by a certain date and had to focus on other things (the whole house was custom so we literally had to pick every thing). We are now hoping to finish that off and the fireplace stone. The house has been a long process :) Thanks for all of your help and input. And in other news, I spoke to the tile store and they do have our tile in bullnose on the short side, and in bullnose on the short and long side (in case we need to have some of the upper edge exposed too). Hooray! Once I get the tile up and finally add a little decor I will post a reveal.

I have a similar question five years later: Is the 4" matching back splash now out of style? And how long will it stay out of style? Doubt that it would be possible to get a full matching back splash 14 years after the home was built. I am considering removing the 4" back splash and going with a complementary tile or, perhaps, a colorful wallpaper. Thoughts as to how long the short back spash will stay out of style? (I'm old enough to remember bell bottoms - the first time they were in style.)