King Post Walls are a cost effective system of retaining walls. Also known as Berlin Walls and Soldier Piles the simple and quick installation comprises drilling a hole with a CFA piling rig, filling it with concrete and installing an H pile which facilitates timber sleepers or concrete/steel panels to be mounted between the webs of the piles, resulting in the finished embedded retaining wall.

They may be used for many different retention applications including flood defence walls.