Find a place with plentiful sod. In an emergency, make sure you are close to a water supply. The best grass for sod houses is dense, like buffalo grass or Indian grass.
Cut out sod bricks from the ground. It will look like the sod pieces sold in home improvement stores, but thicker and smaller. You want them to resemble bricks. You'll need hundreds of bricks to build with so the smaller you cut, the longer your sod will go (and the bigger your sod house will be).
Place the bricks down on level ground in the shape you want your sod house. Don't forget to leave an opening that will serve as your door. Do not put any windows in your sod house if it is for survival purposes.
Build up the walls of the sod house by overlapping the sod brick layers. Do not stack the bricks on top of each other, instead alternate placements in each layer.
Construct a door frame with wood and ensure it's solid enough to withstand the weight of the sod you will be laying on top of it. One log or wood piece goes across the top of two standing pieces with sod surrounding all sides tightly.
Keep walls straight and at right angles to each other.
Gather branches of tress to weave across the top of your sod house as a roof.
Cut larger pieces of turf blocks to lay on top of the branches of the roof. The grass of the sod should be facing the sky.
Repair cracks with mud as often as necessary to maintain the sod house you build. The sod gradually will harden.