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Dytecture There isn't a right or wrong answer, but usually the faucet would be a bit higher than the window sill.

ASVInteriors Do you open your windows often, or do they stay closed? If it is the former you need a smaller faucet
I found one at IKEA at 7" in height; if it is the latter you can go for a larger industrial columns as it seems your sink is centred with the window (gauging by the vase) - the other two taps...

BeautifulRemodel.com Hi minou16,

Unless your windows open in at the sink (which would be unusual) I'd choose the faucet height based on the depth of your sink and the height of the largest pot you plan to use. A high arch faucet at a sink can be great, as its quite versatile, and a pullout spray makes it more so, imo.

- Steve

minou16 THANKS SO MUCH FOR YOUR IDEAS. I GREATLY APPRECIATE IT. ADDITIONAL INFO REGARDING THE SINK. ORDERED A SINGLE BOWL RECTANGULAR SINK FROM ELKAY UNDERMOUNT DUE TO THE GRANITE COUNTERTOPS. INSDE BOWL MEASURES 28X16X11.5

Ironwood Builders With the giant vase in the middle of the window, doesn't look like you open it in any way. BeautifulRemodel and Dy are correct.

Sara Bederman Interior Design I would definitely recommend a single hole faucet with a pull out spray. Make sure it has a high arc to clear the window will. It will look great peeking above the sill.

PoshHaus Frequently I see faucets in the window ledge height. Checkout over 1200 different kitchen faucets! http://www.poshhaus.com/store/c/208-Kitchen-Faucets.html

A Kitchen That Works LLC Have you seen the Moen Motion Sense faucet? I have installed two of these faucets and the clients love them (so did the plumber). Which ever route you take, go for pull-down rather than pull-out for better ergonomics and single lever vs. two handle, again for ergonomics.

Mary Poulos Interior and Exterior Design Great info, learned a thing or two myself. A Kitchen good point.

minou16 I JUST LOVE HOW HELPFUL EVERYONE IS AND AM GRATEFUL THAT YOU TAKE THE TIME TO POST. DID DO ONE THING AND GOOGLED KITCHEN SINK WITH BAY WINDOWS AND GAVE ME QUITE A BIT OF PHOTOS. ANY MORE INSIGHTS ALWAYS APPRECIATED. I AM IN THE WDC AREA ANY SHOWROOMS THAT YOU LIKE PLEASE LET ME KNOW.

minou16 Just finished by kitchen and went with the Grohe single lever with spray in the faucet. I got one that is low enough to keep the bay height line clean and not break the line. So happy with the result I have my new sink single bowl sink from elkay. Love the simplicity of these two items. Updated by kitchen and fell in love with anitquued finish of the Bianco Fiori Granite. Thanks so much for everyone's time and input. So grateful to have a place to talk out my design choices. Thanks again.