We have casements throughout the house so we used them in the kitchen too. We bumped the window out so there is room behind the sink for plants...I'm so glad I did. Casements are far easier to open than double hungs when placed over a counter and they are more energy efficient than double hungs. And no cross piece at eye level to get in the way of the view and the light.

I don't have a window over my sink, but have 2 large and 1 small window in my kitchen and chose casement windows. I prefer them to double hung for the simple fact that I can see through the entire window.

Thank you both, and Annie thanks for reminding me about a bump out for plants. There are too many things to keep track of in this remodel!

I went with a casement bay window and I love it. It's an Anderson 400 series and its their smallest bay window. I went with the bay because I wanted a larger span of windows than a single and I didn't want the center divide that would be created with 2 windows. Three windows seemed to be just too large since I still wanted upper cabinets.

I also bumped it out to have a large place to put plants (but my basil plant already died, so I need to work on my green thumb skills). Here it is:

The center window doesn't open. The two sides open. Mine is not to the counter for reasons too boring to get into as well, but I love that it is low. Note that this type of window above my bumped out sink base could make it difficult for a short person to reach the cranks to open the window, but I am tall and its not an issue for me.