Ok, I figured out how to provide access a picture. I'm attaching a link to the floorplan of the kitchen.

Here is a link that might be useful: Kitchen layout

I'd say no to the island. It'd end up being so small & you'd constantly be walking around it or bumping into it. Remember you need 42" clearance around an island, you have 6 sides to allow 42" around. It doesn't look like one will fit. I just did a quick scaled drwg. without exact dimensions it looks like your island could be @ 12" x 18".
Sorry- not a good idea.
Good Luck. Congrats on building a house. What fun

Here is a link that might be useful: granite countertops

mrskitten--I am no expert, but that makes me nervous! My kitchen is 12' wide too, and I just squeezed an island in. The length of my long perimeter cabinets is 13'. Some might say it is too tight, but it is okay. I don't have a peninsula at the end of the long wall, but if I did I know it would feel too cramped. I think you might have to pick one or the other. When the kitchen is 12' wide the problem becomes that it is on the hair edge of being too narrow for an island and yet there is a lot of open space. Perhaps if you do a rolling/portable island it might work.

Here's picture of my in progress kitchen. The 13' is from the end of the base cabinet to the wall where the stove is. And the 12' measurement is from wall to wall, left to right.
{{!gwi}}

Ok. Thanks for your responses!

mrskitten72

I have both an island and a peninsula. But my island is a 24" x 24" cabinet, with a Boos chopping block on it. And it has wheels. I just measured and where we have it sitting in the kitchen and it is 31" from the peninsula, 34" from the sink, and 36" from the range. There's only two of us in the kitchen, usually, so it's never in the way. And it's so nice to have something to chop everything up on and just spin around and put in a pot, or wash veggies in the sink and turn and place them on the chopping block, where they get chopped and turned around into the pan. We put it on wheels so that if it was in the way we could move it. But we hardly ever move it. In fact, with it being so central, we do about 75% of our kitchen work on the thing because we can stand at it from all four sides. If you could fit in something like that, I wouldn't underestimate the value of 4 square feet in the middle of your kitchen.

We followed advise on this forum regarding needing 42" between island and counters and I find it too much. I wish I had gone 36" to be honest. I could have had a larger island. I went with a 24" x 54" island, not tiny, but it could have been 36" x 66" easily.

I just saw this and immediately thought of you/this thread:

Here is a link that might be useful: Both peninsula and island

I think it can be done but it depends on how you cook
and the kind of space you crave.

I have a small kitchen almost exactly like your floor plan.
12 by 12. I love the look of an island
far better than a penisula but I had to choose.

If you love the look of both and can work in a smaller
space, I say go for it. I could not :( have an island.
I am a tall lady with long arms, I would feel like I was
tangled in one of my family members while making
a sandwich. Hee Hee

~boxerpups

Here's your floor plan:

Can you cut down the size of the peninsula if you add an island by placing the dishwasher in the island directly across from the sink?

I'm a personal fan of peninsulas, since they create an optimal working niche for the cook out of the stream of kitchen traffic. But it does look as though you have another niche along the opposite wall already, so perhaps minimizing the sink peninsula wouldn't sacrifice that.

How do you envision using an island as you progress through your family's day/cooking meals?

Where does that door next to the wall ovens go? If it's a regularly used door, then an island would be directly in the path between the entrance to that kitchen and the door on the opposite side. weedyacres' island works because her kitchen openings line up and her penninsula is squared off instead of diagonal. I honestly think an island might be in the way too much. Here's my suggestion. Go ahead and finish the house without the island. Then set up a temporary island in that spot. Live with it for a while and see if you like it...or if it feels like a barrier. It's easy to add an island later.

I agree , it could be tight.

Weedyacres, can you tell me the clor of your countertops and backsplash. I love it. Thanks

Sorry, sandi, just saw this. Counter is Terra Brazilas granite and backsplash is simply matte biscuit ceramic tiles.

We had both.

{{!gwi}}

Amy