![]() To make the bunker safe, you need to add insulation and ventilation, but both these steps can be completed relatively easily using polystyrene insulation panels and 12v computer fans. While you’ll struggle to transform a septic tank into luxury underground accommodation, you can make it safe and survivable. To give you a clearer idea, this 8’ x 12’ mini bunker carries a price tag of $45,500! The average cost of a 1500-gallon pre-cast concrete septic tank is approximately $1,590, which is a lot cheaper than the average underground bunker. To make an underground bunker using a concrete septic tank, you can either order a pre-cast tank from a reputable manufacturer or build your own. ![]() As you need around 10 square feet per person, this would give you a bunker big enough to house up to six people. The most popular 1,500-gallon septic tank measures around six feet wide by 10 feet wide, giving you approximately 60 square feet of floor space. If your septic tank is already trapping and filtering your toilet waste, you can’t go and live in it, but you could install another one as your purpose-built backyard bunker. Underground Bunker Plans #1 Septic Tank DesignĪ concrete septic tank makes a sturdy base for a basic underground shelter and is cheap and comparatively quick to install.Īround 20% of all the homes in the US already have a septic tank installed, but that doesn’t help. There aren’t a lot of underground bunker plans available for free, but you can get some useful ideas from companies manufacturing bunkers or using the plans for old bomb shelters and root cellars as a basis for your design. Designing and building your own is a cheaper option and one you can achieve relatively easily, provided you can come up with some viable plans. Soil costs between $12 to $18 USD per cubic yard.As climate change and global unrest promise more local and global catastrophes so, more people are considering having a subterranean world to escape to.Īlthough you can buy ready-made underground bunkers, these are often prohibitively expensive.For example, if it's 1.5 foot (0.46 m) tall and you want a 15 foot (4.6 m) tall bunker, you need 7.5 layers (15/1.5). Now, use this to determine how many layers you need. After determining how many bags you need per layer, fill up one bag and measure it's height. Earth bag height will vary depending on how they're filled.For example, if each layer requires 4,608 bags and you need 6 layers, you need 27,648 earthbags in total (6 x 4,608). Multiply the total number of bags needed per layer by the number of layers for the total bags for your structure.This means that total amount of bags per layer is 2,304 x 2 (since there are 2 lengths and widths 2 per layer), or 4,608. Consider a bunker that is 240 feet (73 m) long and wide: it requires 1,152 bags for both the length and width-240 feet (73 m) divided by 2.5 inches (6.4 cm)-which is a total of 2,304 for 1 length and 1 width.After determining the length and width of your bunker, buy the appropriate number of bags needed to cover this space. If you're looking for the simplest method of creating your bunker structure, this is the way to go. Earthbags are low-cost structural materials that can be purchased from online suppliers. Buy 1.5 by 2.5 in (3.8 by 6.4 cm) earthbags for a low-cost solution.
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