Here is a nice example
of a lap siding building with 2 x 4 wood trim around the window. There
are many different styles and methods for trimming out the windows on
homes with wood or cement fiber siding.
It's not common to install another wood trim piece on top of the window
trim like you see in the picture above. When I was looking at the
architectural detail for the window, I wasn't impressed, but it turned
out nice and added a little more detail to the home.
I prefer using 2 x 4 wood trim and leading the siding to it, instead of
using 1 x 4 trim over the lap siding. Its seals the exterior of the home