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You will pour concrete into this frame in order to create a footing. The footings will form the basis for your foundation. The boards should be built according to the specifications of your foundation in your designed plan. Remember to seal the footings to protect them from moisture. Use a high quality sealer. You can pour concrete either directly into trenches or into wood forms. Start with the corners of the foundation and then build a plum and level wall connecting the two corners. Having something to connect the wall to on either side makes the process easier. It's much easier to spot if the wall is out of alignment. Remove the flaws using hand trowels. You will want to use it on the ceiling too if you plan to cover your roof heavily with dirt and soil. Living underground will keep the temperatures relatively moderate, but the earth also puts a huge amount of pressure on the walls and ceiling of your house. . It's also essential to hire a structural engineer to design earthquake resistant elements if you live in an earthquake prone area. You can choose a material as simple as wood boards or something more complex, but sturdier, like brick or concrete. If you choose brick or concrete ensure that you building has strong structural supports. You will have to lay the brick yourself by buying brick and mortar and building a thick pillar up to the ceiling. A six brick base should provide a decent support. If your room is very large you will want to build a few supports. Scaffolding is something that you can buy at a home improvement store, but is more likely to bend and break. Take this step very seriously or you risk potential cave-ins. Set up these rooms in accordance with your design plans. Make sure that you leave space in the walls for any potential wiring that you'll need to do. Even though you're living underground you may need insulation. This will keep your heating and cooling costs down and make your energy use much more efficient. Wait until after you have completed the wiring before you install the insulation.
Build a perimeter wood frame. Install footings to provide the base for your foundation. Create stem walls. Consider using reinforced concrete on the walls. Decide what kind of ceiling you want. Plan to have scaffolding or brick pillars secure your ceiling. Use wood beams to outline the rooms in your house. Consider insulation.