Dave, when I first moved in to bamber my front porch was red brick and it had some holes in the morter. Rough green snakes (more than 1) lived in there (there was a hollow in the dirt below the brick) for about 5 years. Then my wife started having nightmares about them. In the nightmares she could see them curled up inbetween the windows and screens, trying to get in.
I used to see them in the bushes of my front yard as a common ocurrence. Very cool. Alas, I had to bite the bullet. When I destroyed the porch I caught and released at least 2 of them into the woods across Lacey Road.