Key Takeaways:
- The average cost to build an underground bunker is $60,000, with most homeowners spending between $40,000 and $80,000 for a 200 square foot shelter.
- Bunker installation costs $200 to $400 per square foot on average, depending on the size, location, and amenities of the shelter.
- Labor costs for excavation, utility installation, and finishing work make up a significant portion of the total budget for a bunker project.
- Additional features like air filtration systems, blast doors, and luxury upgrades can add tens of thousands of dollars to the cost of a bunker.
- Building an underground bunker is a complex and expensive project that requires professional design and installation for safety and longevity.
At Renotag, we understand that in uncertain times, the idea of having a secure underground bunker can be appealing. But how much does it actually cost to build a bomb shelter or fallout shelter? Let’s break down the factors that influence the price of this unique type of home improvement project.
Average underground bunker cost
| Average cost to build a bunker | |
|---|---|
| National Average Cost | $60,000 |
| Minimum Cost | $20,000 |
| Maximum Cost | $9,000,000 |
| Average Range | $40,000 to $80,000 |
As you can see, the cost of building an underground bunker varies widely depending on the size, location, and features of the shelter. On average, you can expect to pay between $200 and $400 per square foot, with most homeowners spending a total of $40,000 to $80,000 for a 200 square foot bunker.
Of course, these are just rough estimates. A basic, bare-bones shelter might cost as little as $20,000, while a luxurious, fully-equipped bunker could easily run into the millions of dollars. The exact price will depend on your specific needs, preferences, and budget.
Bomb shelter cost by size
The size of your bunker is one of the biggest factors in determining its cost. Here’s a breakdown of common bunker sizes and their average price range:
| Size (square feet) | Average installed cost |
|---|---|
| 100 | $20,000 — $40,000 |
| 200 | $40,000 — $80,000 |
| 300 | $60,000 — $120,000 |
| 400 | $80,000 — $160,000 |
| 500 | $100,000 — $200,000 |
| 1,000 | $200,000 — $400,000 |
As a general rule, the larger the bunker, the higher the total cost. However, the cost per square foot may be lower for larger shelters due to economies of scale. A 1,000 square foot bunker, for example, might have a lower cost per square foot than a 100 square foot bunker because the fixed costs (like excavation and utility hookups) are spread out over a larger area.
Keep in mind that these size ranges are just examples. You can build a bunker in virtually any size, from a small, one-person shelter to a sprawling, multi-room complex. The right size for you will depend on your intended use, the number of occupants, and your budget.
Fallout shelter cost factors
In addition to size, there are several other factors that can influence the cost of building an underground bunker. Let’s take a closer look at some of the major expenses involved.
Labor
Building an underground bunker is a complex and labor-intensive process that requires specialized skills and equipment. Here’s a breakdown of some of the key tasks involved and their average costs:
| Project | Average installed cost |
|---|---|
| Excavation costs | $1,100 — $5,600 |
| Tree removal costs | $150 — $2,000 |
| Gas line cost | $360 — $740 |
| Running electricity cost | $1,200 — $7,100 |
| Plumbing pipes cost | $4 — $5 per square foot |
| Water heater cost | $600 — $5,600 |
| Septic tank cost | $3,500 — $8,500 |
| Appliances cost | $2,500 — $6,800 |
| Flooring cost | $4 — $15 per square foot |
As you can see, the labor costs for building a bunker can add up quickly. Excavation alone can cost thousands of dollars, depending on the size and depth of the shelter. Installing utilities like electricity, plumbing, and gas lines is also a significant expense, as is finishing the interior with flooring, appliances, and other amenities.
To get an accurate estimate of the labor costs for your bunker project, it’s important to work with experienced contractors who specialize in this type of construction. They can help you navigate the complex logistics and ensure that your shelter is built to the highest standards of safety and quality.
Security
One of the main reasons people build underground bunkers is for security and protection from potential threats. But adding security features to your bunker can also significantly increase its cost.
Here are some common security upgrades and their average costs:
- Blast doors: $5,000 to $10,000 or more
- Air filtration systems: $1,000 to $5,000 or more
- Backup generators: $3,000 to $20,000 or more
- Security cameras and monitoring systems: $1,000 to $5,000 or more
- Reinforced concrete walls and ceilings: $10,000 to $50,000 or more
The exact cost of these features will depend on the size and complexity of your bunker, as well as the specific products and materials you choose. A basic air filtration system, for example, might cost a few thousand dollars, while a top-of-the-line system with multiple redundancies could easily run into the tens of thousands.
It’s important to carefully consider which security features are essential for your needs and budget accordingly. Working with a qualified bunker designer or contractor can help you make informed decisions and ensure that your shelter is equipped with the right level of protection.
Luxury upgrades
While the primary purpose of an underground bunker is to provide a safe and secure shelter, some homeowners choose to add luxury features and amenities to make their stay more comfortable. These upgrades can significantly increase the cost of the bunker, but they can also make it feel more like a home than a utilitarian space.
Here are some examples of luxury bunker upgrades and their average costs:
- High-end finishes (like hardwood floors, granite countertops, etc.): $10,000 to $50,000 or more
- Home theater systems: $5,000 to $50,000 or more
- Gourmet kitchens: $20,000 to $100,000 or more
- Fitness centers: $5,000 to $50,000 or more
- Hydroponics gardens: $5,000 to $20,000 or more
Of course, the sky’s the limit when it comes to luxury bunker amenities. Some high-end shelters even include features like swimming pools, bowling alleys, and wine cellars. But these upgrades come at a steep cost, and they may not be practical or necessary for everyone.
If you’re considering adding luxury features to your bunker, it’s important to weigh the costs and benefits carefully. Will these amenities significantly improve your quality of life in the shelter, or are they just expensive extras? Will they require additional maintenance or energy usage that could strain your resources? Answering these questions can help you make informed decisions about which upgrades are worth the investment.
Bunker FAQs
What is a bunker?
A bunker is an underground shelter designed to protect occupants from natural disasters, nuclear attacks, or other catastrophic events. Bunkers can range from small, basic structures to sprawling, fully-equipped complexes with multiple rooms and amenities.
The main purpose of a bunker is to provide a safe and secure space where occupants can survive for an extended period of time without access to the outside world. To achieve this, bunkers are typically built with reinforced concrete walls and ceilings, blast doors, air filtration systems, and backup power and water supplies.
Can I build a bomb shelter myself?
Building an underground bunker is a complex and technical process that requires specialized knowledge and equipment. While it may be possible for a skilled DIYer to construct a basic shelter, it’s generally not recommended to attempt this project without professional guidance.
There are many factors to consider when building a bunker, from site selection and excavation to structural engineering and utility installation. Making mistakes or cutting corners can compromise the safety and integrity of the shelter, putting occupants at risk.
Additionally, building a bunker may require permits and inspections from your local building department. Failing to comply with these regulations can result in fines, legal issues, and even having to demolish the structure.
For these reasons, it’s best to work with experienced professionals who specialize in bunker design and construction. They can help ensure that your shelter is built to the highest standards of safety and quality, and that it meets all necessary legal requirements.
What kind of filters do bunkers use?
One of the key features of an underground bunker is its air filtration system. This system is designed to remove contaminants, toxins, and other harmful substances from the air inside the shelter, providing occupants with a safe and breathable atmosphere.
There are several types of filters commonly used in bunker air filtration systems:
- HEPA (High Efficiency Particulate Air) filters: These filters are designed to remove at least 99.97% of particles that are 0.3 microns in size or larger, including dust, pollen, and bacteria.
- Carbon filters: These filters use activated carbon to absorb gases, odors, and chemical vapors from the air. They are often used in combination with HEPA filters for maximum effectiveness.
- NBC (Nuclear, Biological, Chemical) filters: These specialized filters are designed to remove radioactive particles, biological agents, and chemical toxins from the air. They are typically used in high-end military-grade bunkers.
The specific type and size of filter needed for a bunker will depend on factors like the size of the shelter, the number of occupants, and the potential threats being protected against. A qualified bunker designer or contractor can help determine the appropriate filtration system for your needs.
How deep should I install an underground bunker?
The depth of an underground bunker can vary depending on factors like soil conditions, water table levels, and the specific threats being protected against. In general, most residential bunkers are installed at depths of 10 to 20 feet below ground level.
Here are some considerations for determining the appropriate depth for your bunker:
- Soil conditions: The type and stability of the soil on your property will influence how deep you can safely excavate. Sandy or loose soils may require shallower depths, while dense, stable soils can accommodate deeper shelters.
- Water table: If the water table on your property is high, you’ll need to avoid excavating too deeply to prevent flooding or moisture issues in the bunker.
- Threat level: The depth of your bunker should be based on the specific threats you’re preparing for. A basic storm shelter may only need to be a few feet underground, while a bunker designed to withstand nuclear fallout may require a depth of 20 feet or more.
- Building codes: Your local building department may have specific requirements or limitations on the depth of underground structures. It’s important to check with them before beginning your project.
Ultimately, the depth of your bunker should be determined by a qualified engineer or contractor who can assess your specific site conditions and needs. They can help ensure that your shelter is installed at the appropriate depth for maximum safety and longevity.
Getting estimates from bunker installers
If you’re considering building an underground bunker, the first step is to get estimates from qualified installers. Here are some tips for finding and evaluating potential contractors:
- Look for contractors who specialize in bunker design and construction, rather than general contractors who may not have experience with this unique type of project.
- Ask for referrals from preparedness groups, survivalist networks, or other bunker owners in your area.
- Check the contractor’s license, insurance, and references to ensure they are reputable and qualified.
- Request detailed, itemized estimates that break down the costs of excavation, materials, labor, and any additional features or upgrades.
- Ask about the contractor’s experience with bunkers of similar size and scope to yours, and request to see photos or tour completed projects if possible.
- Discuss the contractor’s design process, construction methods, and timeline for completion to ensure they align with your needs and expectations.
Questions to ask bomb shelter companies
When interviewing potential bunker installers, here are some key questions to ask:
- How long have you been designing and building underground bunkers?
- What is your experience with bunkers of my size and type?
- Can you provide references or examples of completed projects?
- What materials and construction methods do you use to ensure the safety and longevity of the bunker?
- How do you handle permits, inspections, and other legal requirements?
- What kind of air filtration, power, and water systems do you recommend for my needs?
- Can you provide a detailed breakdown of the costs and timeline for the project?
- What kind of warranty or support do you offer after the bunker is completed?
Getting detailed answers to these questions can help you feel confident in your choice of contractor and ensure a smoother, more successful project.
Building an underground bunker is a significant investment of time, money, and resources. But for those who prioritize security and self-sufficiency, it can provide invaluable peace of mind in uncertain times. By working with qualified professionals and carefully considering your needs and budget, you can create a safe and comfortable shelter that will stand the test of time.
At Renotag, we’re here to help you navigate the complex world of home improvement and preparedness. Check out our other cost guide for more information and inspiration on creating the secure and resilient home of your dreams.
