Basements in Pole BarnsCan you have a basement in your barndominium? And can post frame buildings even work with a basement? And what about safe rooms or storm shelters in barndominiums?

The straightforward answer is yes, you can indeed have a basement beneath your pole barn, or you can have a storm shelter added. However, before you break ground, there are some key aspects to consider. Unlike traditional construction methods, pole barns rely on vertical poles to support the structure, making modifications for a basement different than those of conventional buildings.

Construction Considerations for Adding a Basement to Your Pole Barn

• Foundation Matters

Pole barns traditionally rely on posts driven into the ground. To add a basement, you may need to explore alternative foundation options, such as a concrete slab or full basement walls. Talk with your builder to understand what is going to work best for your individual situation. Sometimes a hybrid approach works well too! If you want a basement under only a portion of your build.

• Local Building Codes

Check your local building codes and regulations. Some areas may have restrictions on basement construction or specific requirements you need to meet. Compliance with these codes is going to be essential for a successful project.

• Excavation Process

Excavation for your basement is usually contracted through the builder you use, unless you have a licensed, trustworthy excavator you know, who is able to work well with your builder. Whoever is doing the excavation should be familiar with and have done basement construction before. You don't want to hire someone who has never done this before, as it can compromise your entire build.

• Soil Composition

The type of soil on your property plays a role as well. Sandy soils are generally easier to excavate than clay-heavy ones. A soil test can provide insights into the feasibility of digging a basement and what reinforcements and materials will be needed to work best for your particular site.

• Materials and Waterproofing

Basements demand specific construction materials to withstand the underground environment. Waterproofing measures become really important to protect your space from moisture issues.

Cost Considerations: How expensive is a barndominium basement?

Adding a basement to your pole barn involves costs beyond the standard construction of the build itself. Excavation, foundation reinforcement, additional labor and materials contribute to the overall expenses. However, the investment may be worthwhile if the extra space aligns with your needs. Cost will depend on size, terrain, and the area where you live. Talk to your builder for a personalized quote.

Pros and Cons of a Pole Barn Basement

Pros

• Increased Space: A basement can nearly double your usable space, providing room for storage, workshops, or even additional living quarters.

• Energy Efficiency:  Underground spaces benefit from natural insulation, potentially reducing heating and cooling costs.

• Versatility: The added space allows for various uses, enhancing the overall functionality of your pole barn.

Cons

• Cost: The increased cost of adding a basement to a post frame build is a significant investment that may outweigh the benefits for some people. 
• Complexity: The construction process is more intricate compared to traditional, fully above-ground post frame builds, requiring professional expertise (you probably won't want to DIY any part of the structural build with a basement).
• Permitting Challenges: You'll want to check local regulations and zoning laws, as adding a basement might require additional permits and approvals. If you are working with an experienced builder for your barn, some of them (including Milmar!) will help you navigate through the permitting process for your area. 
  

Steps to Add a Basement

1. Excavation
2. Foundation 
3. Wall Construction
4. Waterproofing
5. Connecting Structures/Floors (stairs, etc.)

Additional Tips

• Consult a Professional

Seek advice from a structural engineer or contractor experienced in pole barn modifications, like Milmar. We can assess your specific situation and offer guidance.

• Plan for Adequate Ventilation

Basements can be prone to moisture, so ensure proper ventilation to prevent issues like mold and mildew.

• Budget Wisely

Adding a basement is an investment. Plan your budget carefully, factoring in excavation costs, foundation materials, and any necessary modifications to your pole barn structure.

Types of basement options would include 1. Full/standard basement 2. Walk-out basement or 3. Half/partial basement

A second story instead of a basement

If you are primarily wanting a basement to have additional square footage in your design, the square footage can be more cost effectively added through a second story. Two-story barndos are going to cost more than a ranch barndominium, but they will certainly still cost less than adding a basement to your design.

Storm Shelters and Safe Rooms in Barndominiums

If having a basement is more for the security of having a storm shelter, there are storm shelter construction methods we can use for barndominiums that allow you to have an above-ground, concrete storm shelter, at a lower cost than a basement construction would cost. We've built a number of these in barndominiums - think of it like a safe room and a storm shelter. 

These storm shelters/safe rooms have become even more popular in barndos in recent years! And they are still more cost effective than adding a basement.

Adding a basement to your pole barn or barndominium design and plans is certainly a possibility. And yes, while it requires careful planning and consideration, many barndo builders can help you include one in your buildings design.

Remember, every property is unique, so what works for one may not work for another. If you’re contemplating this ambitious project, gather insights from local experts and be sure to adhere to regulations. Oh, and hire a good builder that knows what they're doing 😉