+30 Building A Home On A Sloped Surface Ideas. To build on 3 levels you will most likely need to pour the bottom slab, build a retaining wall as you suggest, or a short icf knee wall. Building a custom prefab home on a steep slope a house on a hillside can give you experiences that you can’t get anywhere else.

Mark out where you will build with string and hose; To build on 3 levels you will most likely need to pour the bottom slab, build a retaining wall as you suggest, or a short icf knee wall. A good rule is to create a 6 by 6 slope.