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Work with an architect to design a scaled design and floor plan for your underground house. This plan should be complete with dimensions, details on the potential materials that will be used, As you design your house you should consider air and water filtration systems, potential light sources, and food storage space.  Draw a model of your house to scale using the structural plans that you already created. Now draw in where all the installed appliances will go first, then the furniture, then anything else you would like to include in your plan. Be aware of the following constraints as well:  If you are going to be underground for very long periods of time you will need to have your water set up to some sort of renewing water source and you will also need a ton of space to keep the food you have fresh. This means many refrigerators and a reliable power generator. A reliable air circulation and filtration system is also crucial to avoid getting carbon dioxide poisoning or other airborne illnesses. This can be as simple as a ladder with a hatch on the top or even a tunnel leading up and to the outside. The easiest option is buying a staircase. You can buy a staircase online and have it delivered to your house, so it doesn’t even need to be part of the construction if you don’t want.  If you decide to use a ladder you may need to secure the ladder to the wall with metal supports. Buy U-shaped metal supports at a home improvement store and secure these into your wall over the steps of your ladder. This will keep it stable while you are climbing up and down. You can also buy airtight hatches to secure the top of your entrance. Once again it is important to make sure that your hatch is significantly wider and longer than the hole you wish to cover.
Develop detailed structural plans. Design your house. Include an entrance and exit in your design.