Q&A for How to Build an Underground Bunker

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  • Question
    What are the major concerns for a bunker, safety-wise?
    Andrew Peters
    Andrew Peters
    Architecture & Construction Specialist
    Andrew Peters is an Architecture and Construction Specialist and a Principal at Peters Design-Build, a full service architecture and construction firm in the San Francisco Bay Area. With over 20 years of experience, Andrew specializes in sustainable and holistic design and building practices. Andrew holds a Bachelor of Architecture and a Project Management Professional (PMP) certification and is a Leadership in Energy and Environmental Design (LEED)-Accredited Professional. He served as Project Manager for the international-award-winning “Refract House,” Team California’s entry in the 2009 U.S. Department of Energy Solar Decathlon, a project featured in over 600 online and print articles.
    Andrew Peters
    Architecture & Construction Specialist
    Expert Answer
    Waterproofing is a nightmare. Water is especially dangerous when it come to building integrity, and it's very hard to waterproof spaces underground if there isn't a building on top of it to divert water away.
  • Question
    Can I build a house underground?
    Andrew Peters
    Andrew Peters
    Architecture & Construction Specialist
    Andrew Peters is an Architecture and Construction Specialist and a Principal at Peters Design-Build, a full service architecture and construction firm in the San Francisco Bay Area. With over 20 years of experience, Andrew specializes in sustainable and holistic design and building practices. Andrew holds a Bachelor of Architecture and a Project Management Professional (PMP) certification and is a Leadership in Energy and Environmental Design (LEED)-Accredited Professional. He served as Project Manager for the international-award-winning “Refract House,” Team California’s entry in the 2009 U.S. Department of Energy Solar Decathlon, a project featured in over 600 online and print articles.
    Andrew Peters
    Architecture & Construction Specialist
    Expert Answer
    It depends on where you live, but it's typically illegal to do this. Homes usually have to have windows, which means you can't put an entire house underground. For a regular building, you wouldn't be able to build it out underground to be especially large, but again, it's a moot point since you won't be legally allowed to build it.
  • Question
    What kinds of food should I store in the bunker?
    Anthony Porter
    Anthony Porter
    Outdoorsman and Survival Expert
    Anthony Porter is a nature educator, archer, and outdoorsman based in South Lake Tahoe, California. He is an Outdoor Survival expert, and educates millions around the world through his social media presence as “Outdoor Anthony”. His videos have turned him into a viral sensation on TikTok & Instagram, where he has over 400k followers. He is the current Communications Director of the Tahoe Rim Trail Association, promoting wildlife stewardship and preservation on print media, TV, and radio. Anthony has also showcased his outdoor prowess as a recurring yearly TV athlete as NBC's the Archery Ninja on American Ninja Warrior. He is also the producer, editor and Host of the Orangutan Podcast, discussing rainforest conservation initiatives with Dr. Gary Shapiro, famous for teaching orangutans symbolic sign language. As a professional educator for the better part of a decade, Anthony has explored 20 countries, and has taught people of all ages across the United States. He received a Bachelor’s degree in Parks and Recreation Management from Northern Arizona University, and earned an MBA from Cal Poly Pomona with a concentration in sustainable Marketing, and is always looking to dive right into the next adventure.
    Anthony Porter
    Outdoorsman and Survival Expert
    Expert Answer
    Foods that are non-perishable, nutrient-dense, and easy to prepare. Shelf-stable items like canned goods (beans, vegetables, meats, and soups) are essential because they last for years and provide a good mix of protein and fiber. Include packs of oatmeal, which are lightweight, filling, and simple to make with just water. Add dried foods like rice, pasta, and powdered milk, as well as high-energy snacks like nuts, granola bars, and dried fruit to give you an energy boost when needed. It’s also smart to have some MREs (Meals Ready to Eat) or freeze-dried meals that just need hot water and a small stove or portable burner to prepare. Keep plenty of bottled water, and if space allows, have water purification tablets or a portable water filter for emergencies. Don’t forget essential cooking items like a small camping stove and fuel. You’ll also want to stash some comfort foods like chocolate, tea, or instant coffee because morale is also important. You should also include batteries, a headlamp, strong rope or paracord, a can opener, and utensils. Keeping some extra spices or seasoning packets on hand can make even the blandest rations feel a bit more satisfying. Lastly, make sure your storage setup is dry and cool, and rotate your stock occasionally, maybe after a few years, to keep your supplies fresh.
  • Question
    Why does the government steal my stuff, but not say/do anything to stop me?
    Peyton Schmiege
    Peyton Schmiege
    Community Answer
    It is not the government, but robbers. The government would fill it in. Remember to keep your tools and materials safe.
  • Question
    What is the best and strongest material to build a bunker if money is not an issue?
    Blue Monkey Mason
    Blue Monkey Mason
    Community Answer
    Reinforced concrete and a lot of steel. You will need to make the wall quite thick.
  • Question
    I have a crawl space under my house. Can that space become my underground bunker?
    Peyton Schmiege
    Peyton Schmiege
    Community Answer
    If you know how to access it from your crawl space, it will be protected and hidden there. But you should still do some digging, as your crawl space will not be tall enough.
  • Question
    Why would it be illegal? I mean, if you build it underground, it can’t be messed up in a storm and mess up some one else’s house. Also it can’t fall over.
    Peyton Schmiege
    Peyton Schmiege
    Community Answer
    You may have a faulty design that was not considered safe, or you could need a better cover for it. Your city probably doesn't want a dangerous structure or one that looks bad from the surface. Your best bet is to redesign it and ask again.
  • Question
    Can't I build it and call it a deluxe root cellar?
    Peyton Schmiege
    Peyton Schmiege
    Community Answer
    Yes, you can call it a deluxe root cellar as it is underground. Just make sure to follow the restrictions for that structure type.
  • Question
    Are these bunkers meant for natural disasters and nukes?
    Peyton Schmiege
    Peyton Schmiege
    Community Answer
    Concrete and metal are great radiation blockers and can survive other disasters.
  • Question
    Can I bury a small house?
    Peyton Schmiege
    Peyton Schmiege
    Community Answer
    Yes, you can make a small overground mudroom with windows, then a hatch to your real house underneath. Just properly ventilate your space and it should be legal.
  • Question
    Is it safe to build a bunker at your house?
    Peyton Schmiege
    Peyton Schmiege
    Community Answer
    Yes. It is the safest and easiest location to access. You won't run into property restrictions either.
  • Question
    Where would I find information on building an underground barn/fallout shelter?
    Community Answer
    Community Answer
  • Question
    What happens if I dig below 100 feet?
    Peyton Schmiege
    Peyton Schmiege
    Community Answer
    It would need extreme reinforcing and could exceed $500,000. It could be prone to cave ins if you build it wrong.
  • Question
    How much money does it cost?
    Peyton Schmiege
    Peyton Schmiege
    Community Answer
    As cheap as $10,000 to as expensive as you want. A good one might cost $25,000-$50,000.
  • Question
    What if I don’t have a lot of money?
    Community Answer
    Community Answer
    The materials shown above should help you keep the costs down.
  • Question
    What if I can’t afford it?
    Peyton Schmiege
    Peyton Schmiege
    Community Answer
    You can save up for a cheaper version. You could probably build one for $10,000, if you build it right.
  • Question
    Can I still build this legally?
    Peyton Schmiege
    Peyton Schmiege
    Community Answer
    Yes, just get the right permits and stick to your plans. Shelters are legal types of structures.
  • Question
    How long would it take to build an underground bunker?
    Peyton Schmiege
    Peyton Schmiege
    Community Answer
    It might take a few days if you do it by hand, or hours with friends and an excavator.
  • Question
    When might I need an underground bunker?
    Peyton Schmiege
    Peyton Schmiege
    Community Answer
    During natural (tornadoes, parasites, etc.) or manmade (bombings, nuclear fallout, etc.) disasters.
  • Question
    What if I were to make a bunker half-submerged, Hobbit style? Would it make waterproofing easier?
    Peyton Schmiege
    Peyton Schmiege
    Community Answer
    That is not optimal as enemies can find your bunker easier, but you would need less waterproofing.
  • Question
    I am an 11-year-old. Should I ask for adult help to build my bunker?
    Peyton Schmiege
    Peyton Schmiege
    Community Answer
    Yes, it would be hard -- even dangerous -- for an 11-year-old. See what your parents think and show them your design. They may offer to build it for you.
  • Question
    Can I convert my basement to a emergency bunker?
    Panda Man
    Panda Man
    Community Answer
    Yes, you absolutely can. How you do this depends on your basement, but it's a good idea.
  • Question
    I have an old basement foundation. Its building burnt down years ago. It’s just a square pit lined with cinder blocks, about 12x12 and 7 feet deep. Could I turn this into a bunker?
    Community Answer
    Community Answer
    That could make a very good bunker, especially if you could use all the utilities from the old building. Here are some steps: 1. Assess your space. 2. Create a design for your new bunker. 3. Check for damage in the basement. 4. Seal any cracks. 5. Divide it into rooms (optional). 6. Reinforce the walls. 7. Install a new roof. 8. Redo all the utilities. 9. Cover it up. 10. Put in your furniture and supplies. 11. Check for anything else that needs work. 12. Enjoy your refurbished bunker.
  • Question
    What if I had a $5,000,000 budget. What is the best filtration for long-term use?
    Peyton Schmiege
    Peyton Schmiege
    Community Answer
    HEPA air filters are used in nuclear power plants and hospitals. That would be your best bet. $5,000,000 would provide you with a pretty good bunker!
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