Concerning inground drainage, I had my house built on one rai, with the house at the highest point and the ground slightly sloped. I had a wall built around the perimeter and just a concrete gully at the back, sloped toward the corner, where it drained to the creek in back. I had standing water in the front after heavy rain, so 9 months later, they came back and built a sloping gully in the front and side, leading to the drain in back. I don't have any water problems now but it took me 3 weeks to get the yeard back in shape after the worker left. My only other regret was not choosing a type of light right away for the two posts on either side of the sliding gate to the house. They were wired for lights but I waited for 18 months before finding 2 teak lights to but there. The same electrician that wired the house cut the two wires and ran two new wires from the electrical box on the side wall, to the posts. The wires on top of the side wall didn't bother me but having wires on top of the front, finished wall did. I had a couple of inches of concrete added to the top of the front wall to bury the wires.