Larger kitchen window

[George P.]

Can someone give me an idea as to what would it take to make the kitchen window larger.
Below is the image of what it currently looks like.

Thank you!

[Rusty Thompson]

What kind of siding?

Its a little more complicated than Ryan B. Explained. Your may have to put in a new header. Depending on if its a load bearing wall, you may need new one.Which will involve removing the exterior or interior finish. If its t1-11 then it will be very easy, lap would be much harder.
In my location you would need to pull a permit for it, but I wouldn't waist the time and money on it.
As far as a window guy goes, I would just higher a contractor. Its a easy job, but I wouldn't trust a guy who just replaces windows to do it.