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Basements in Pole Barns

Written by Shane Ferris | March 7, 2025

Basements in Pole Barns

Can you dig a basement in your Pole Barn? And can pole barns even have basements?

The straightforward answer is yes, you can indeed have a basement beneath your pole barn. 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 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.

  • 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. You don't want to get halfway through a project only to find out that you have to tear down your build because it doesn't align with local building codes.

  • Excavation Process

Excavation for your basement is usually contracted through the builder you use. They 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 will compromise your entire build. Digging a basement beneath an existing pole barn requires careful planning. It’s essential to avoid compromising the structural integrity of the poles during excavation. Professional guidance is going to be important when navigating this phase successfully if the building is already standing. 

  • 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: Can You Afford a Pole Barn Basement?

Adding a basement to your pole barn involves costs beyond the standard construction of the barn 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.

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 pole barn owners.
  • Complexity: The construction process is more intricate compared to traditional, fully above-ground barns, 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: Excavate the area beneath your pole barn to create space for the basement. This involves digging deep enough to accommodate the desired height while considering the soil type and stability.
  2. Foundation Reinforcement: Strengthen the existing foundation to support the additional load. This may involve adding more support columns or reinforcing the current ones.
  3. Wall Construction: Build the basement walls using durable materials that can withstand the pressure from the soil. Consult with a contractor to ensure the walls are structurally sound.
  4. Waterproofing: Apply waterproofing techniques to the basement walls to prevent moisture issues. This is crucial for maintaining a dry and habitable space.
  5. Connecting Structures: Integrate the basement seamlessly with your pole barn. This involves creating access points such as stairs and ensuring a smooth transition between the two spaces.

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

Adding a basement to your pole barn plans is certainly a possibility. And yes, while it requires careful planning and consideration, many pole barn 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, adhere to regulations, and, most importantly, enjoy the process of transforming your pole barn into a space that goes beyond the ordinary. Oh, and hire a good builder that knows what they're doing 😉

Unlock the hidden potential of your pole barn – dig deeper, and discover a whole new level of functionality! 

Milmar Buildings is more than capable of assisting you with your post-frame building project. If you still have questions on building your pole barn with a basement, give us a call! We're happy to help in any way we can. Speak with our experts today.

*Originally posted January 13, 2024