This project will take a few weeks to complete, depending on the complexity.
Cost
$1,000+
Costly rentals or equipment—you might want to leave this one to a pro.
Need professional help with your project?
Get quotes from top-rated pros.
What you'll need:
TOOLS
Level
Shovel
Excavator
Masonry trowel
Measuring tape
SUPPLIES
Cellar door
Cinder blocks
Cement
Rebar
Reinforcing mesh (optional)
Wood beams
Steel/concrete beams
Mortar
Roofing material
Waterproof membrane
Insulation
Vents/PVC piping
Nuts and bolts
Safety gloves
Goggles
Face mask
Hard hat
If you live in a storm-prone region, you know that when it comes to safeguarding your family from severe weather, a sturdy storm shelter is essential. A cinder block storm shelter is a reliable option that you may be able to build in your backyard. In this guide, we'll walk you through the process of constructing a storm shelter using cinder blocks. By the end, you'll have a secure place to seek refuge during storms and adverse weather conditions.
Before you continue, know that this is a time-intensive and labor-heavy project. It is not easy or simple. Typically, we recommend hiring a local storm shelter company to build shelters of this magnitude, as this project takes a lot of effort to complete. Unless you have extensive construction experience and more than a few strong and sturdy helpers, do not try this DIY on your own.
When the pros build storm shelters, they know that it's crucial to prepare and plan before rolling up their sleeves and getting into the construction process. They always take a few essential steps to get everything in order before building to ensure the storm shelter project starts off on the right foot.
Before they even break ground, a storm shelter company will take the time to create a detailed plan for your storm shelter. They’ll determine the shelter's size, entry point, and location. Talk with them as you think about an area with proper drainage, away from potential hazards like flood-prone zones or areas with unstable soil. Moreover, consider the accessibility and proximity to your main residence for convenience. Sound complicated? That’s because it is. Seriously, you should probably let a pro handle this one.
Get Permits
You’ll need to research the local building codes and regulations regarding storm shelters in your city. Some areas require permits for such structures, so ensure you have all the necessary documentation to proceed legally. Another good thing about hiring a pro for this project is that they’ll be able to get all the permits for you.
Dig the Hole
Put on all your safety equipment, being sure not to forget a hard hat. With an excavator, dig a hole in the ground according to the dimensions of your shelter's floor plan. Ensure the hole is deep enough to accommodate the entire structure comfortably. This means you should dig about 3 feet wider and longer than the ideal final size of your shelter. This extra space will give you some breathing room for maneuvering during construction and will also provide a stable foundation.
Also, dig down at least 2 feet deeper than the shelter's final height. This extra depth allows you to create a sturdy roof covering. You'll be topping it off with a layer of concrete and then covering it with a layer of soil. That way, your shelter will be well-protected and ready to take on whatever comes its way.
Keep in mind that working with excavators can be very dangerous for people without the proper training and know-how. This is another reason why this is a project best left to the professionals.
Build the Foundation
Create a solid foundation by first laying concrete footings. The footings will bear the weight of the cinder block walls and prevent settling or shifting over time. Use steel reinforcements in the footings to enhance their load-bearing capacity.
Then, you can set up support posts around the perimeter of the foundation frame. These posts will provide additional reinforcement to the structure. You’ll also need to place steel reinforcements—or rebar—inside the foundation frame to add strength to the shelter's base.
Finally, pour a cement mixture into the foundation frame, covering the steel reinforcements completely. Allow the cement to dry and set properly before moving on in the process.
Install a Door Frame and Sturdy Door
Designate an area for the shelter's entrance and construct a sturdy door frame. The door frame will be crucial for easy access and secure closure. Additionally, install a cellar door that is robust and will seal tightly to prevent water infiltration and maintain security.
Lay Cinder Block Walls
Start building the shelter’s walls using cinder blocks. Apply mortar between the blocks, ensuring a tight and secure fit. Make sure to leave openings for doors and ventilation as necessary, and consider adding rebar or reinforcing mesh within the block cavities to enhance structural integrity.
Create the Shelter's Ventilation System
Proper ventilation is crucial to ensure a constant supply of fresh air in your shelter and prevent the buildup of harmful gasses. Install vents with protective screens to keep debris and pests out, or go with a ventilation system made up of PVC piping in the shelter’s corners. Either method will ensure proper airflow inside the shelter.
Build the Shelter's Roof
When it comes to constructing a storm shelter, the roof is a crucial component that plays a vital role in providing protection from the elements. Whether it's a tornado, hurricane, or any other severe weather event, a well-built roof is your shield against the forces of nature.
Opt for materials with good wind mitigation that can withstand impact and flying debris. Metal roofing, reinforced concrete, or thick reinforced fiberglass panels are excellent choices. These materials offer excellent resistance against extreme weather conditions, giving you the peace of mind you need during a storm.
Install Support Beams
Support beams play a crucial role in bearing the weight of the roof and providing a strong foundation to withstand the forces of nature. Choose high-quality materials for your beams, like steel or reinforced concrete, as they boast remarkable strength and resilience.
Before installing your beams, take accurate measurements to determine the appropriate length and size of the support beams. Precision is key to ensuring a perfect fit and reliable support.
Position the support beams strategically to ensure they are resting on a solid foundation. If necessary, use a shovel to dig shallow holes to secure the base of the beams firmly. A stable foundation is vital for long-term durability.
Proper alignment of the support beams is also essential for even weight distribution. Use a level and measuring tools to guarantee the beams are straight and balanced. Once the support beams are in position, secure them tightly and firmly in place. Utilize sturdy fasteners like nuts and bolts to ensure they don't shift or move during extreme weather.
Create a Moisture Barrier
To protect your shelter from water damage, you’ll need to apply a waterproofing membrane on the exterior walls and roof. You should also insulate the interior of your shelter to maintain a comfortable temperature and reduce energy consumption while the shelter is in use.
DIY vs. Hiring a Pro
Building a cinder block storm shelter is a complex task that requires specific skills and tools. While a DIY approach can be rewarding for a select (highly experienced) group of people, it's important to acknowledge your limitations and the potential risks involved in this type of project.
This is rarely, if ever, a DIY project. It's better to hire a local storm shelter builder to ensure a safe and reliable space for you and your family.
Frequently Asked Questions
The time it takes to build a cinder block storm shelter depends on various factors, such as size, complexity, and weather conditions. Generally, construction can take anywhere from a few weeks to a couple of months. Proper planning, obtaining permits, hiccups in the building process, and finishing touches all contribute to the timeline.
While it may require some patience, the end result will be a reliable and secure shelter ready to protect you and your loved ones during severe weather events.
Absolutely! You can tailor the design to meet your specific needs and preferences. Whether it's adding amenities, adjusting dimensions, or choosing different materials, customizing your storm shelter ensures it suits your family's requirements and offers the utmost comfort and safety during severe weather. So go ahead and create a shelter that perfectly fits your unique needs!
The average cost of building a cinder block storm shelter can range from $3,000 to $20,000 or more, depending on various factors. Size, location, additional features, and customization all influence the overall cost. A smaller, basic shelter might be more budget-friendly, while larger or specialized designs may incur higher expenses.
Veronica has been an avid DIYer, gardener, and hobby home designer for over a decade. Her tips and advice can be found on publications like 21Oak, HappySprout, and The Angle. She also recently launched her own homesteading blog centered on teaching people about sustainable living in suburban areas.
Veronica has been an avid DIYer, gardener, and hobby home designer for over a decade. Her tips and advice can be found on publications like 21Oak, HappySprout, and The Angle. She also recently launched her own homesteading blog centered on teaching people about sustainable living in suburban areas.
The homeowners guide to Homebuilders
From average costs to expert advice, get all the answers you need to get your job done.
