If you’re considering a 30 x 40 pole barn, you’re not alone — this size is one of the most popular choices for homeowners, man cave garages, and hobbyists alike. It’s large enough for a three-car garage, small workshop, or storage space, yet compact enough to fit comfortably on most properties.
But the question everyone wants answered is: How much does a 30 x 40 pole barn cost?
The short answer — it depends. Prices can vary based on materials, location, building design, and labor. On average, you can expect a 30 x 40 post-frame building to cost between $20,000 and $45,000, but your final price could shift higher or lower depending on how customized your project is.
In this blog, we’ll break down the key factors that influence price, including DIY kits vs. constructed buildings, material choices, and interior finishes. By the end, you’ll have a clear idea of what to expect — and how to budget smartly for your 30 x 40 pole barn project.
A 30 x 40’ pole barn can cost $35 - $50 per square foot. When factoring only the shell of the building, a basic pole barn costs $20,000 -$30,000+, depending on location, and any additional features.
Typically, people want to add features like additional windows, concrete, and an interior steel liner, which drive up the project cost.
Another factor to consider is which pole barn builder or pole barn kit you select. Each builder has different materials and experience. It is crucial to evaluate each builder before choosing the cheapest option, as they may be omitting a critical line item or utilizing lower-quality materials.
Every 30 x 40 pole barn floor plan designed by FBi Buildings is engineered for maximum strength, functionality, and long-term value. Our engineering team carefully optimizes the layout for your overhead door, walk door, and windows to ensure structural integrity and ease of use.
While walk doors and windows can be adjusted to fit your needs, the placement of overhead doors must remain as designed—whether on the end wall or sidewall—because header sizes and load-bearing requirements vary based on the door's location.
Your material package or constructed 30 x 40 pole barn garage does not include the overhead door itself, allowing you the flexibility to choose a door style and design that best fits your needs.
For your doors and windows, we offer durable steel walk doors available in four styles, with thermal barriers that prevent heat loss and condensation. For superior weather resistance, pultruded fiberglass steel doors provide exceptional durability against Midwest weather extremes. We also include Simonton ProFinish Contractor Series windows, featuring an interlocking meeting rail, insulated glass, and Intercept® spacer system for enhanced energy efficiency and reduced heating and cooling costs.
Choosing to build a pole barn from FBi Buildings means investing in quality-engineered materials that deliver strength, longevity, and peace of mind—backed by warranties and decades of proven performance.
However, it is important to get quotes from local builders as labor wages range regionally. Sometimes, it is worth paying a little extra for a company to install the shell, allowing you to focus on finishing the interior of your residential pole barn.
Often overlooked is the site prep and utilities that go into a pole barn. You'll likely need power to run your power tools or a concrete floor to change the oil in your car inside the barn.
Factor into your budget the costs of grading, foundation work, and pulling permits. Additionally, any water, electricity, or gas that needs to be run to your pole barn must be arranged. The cost to build in the city tends to be lower because electricity lines are typically closer than on a more rural property.
The average pole barn kit ranges from $12,000 to $25,000. While it can be easy to go with a big box store like Menards, it is important to review what is included in each kit and verify the quality of the material.
Currently, an FBi Building's 30' x 40' pole barn kit is $26,154(plus tax and delivery). The difference with an FBi pole barn kit is that our in-house engineers designed these plans. With over 65 years of experience, they can verify that they meet local permitting and code compliance.
Hidden costs to look out for:
Selecting a trusted local builder might be a better solution if you want to take the guesswork and headache of building the post-frame building yourself. They can quickly and efficiently construct your building.
Another advantage is that many well-known builders provide a warranty. Be sure to check which elements of the build are covered under their warranty and ask about lifetime warranty items. Some builders, such as FBi Buildings, provide a one-year workmanship warranty. This ensures that if you are unhappy with something, they will fix it for free!
In the fall of 2025, FBi Buildings launched its constructed building packages. A 30' x 40' completed pole barn starts at $26,985. This pricing is based on your location and is subject to additional tax and delivery charges. It is an optimized price that allows us to deliver the material in one truck load. With a predetermined size and basic features, you can easily understand the starting price. Click the link to see what a complete building would cost in your area.
Hiring a builder like FBi Buildings can be an excellent investment if you want convenience, quality assurance, and peace of mind. FBi's professional teams can manage every stage of pole barn construction—from site preparation and permits to truss installation and final inspections—so you don't have to coordinate multiple contractors or worry about construction details.
Our experienced post-frame construction crews bring the expertise needed to efficiently construct your 30 x 40 pole barn while ensuring the building meets all engineering standards and local code requirements. With FBi, you also gain the added benefit of comprehensive warranties on both materials and workmanship, protecting your investment long after the project is complete.
Each construction method comes with its own price point. While hiring a builder typically costs more upfront than a DIY or self-GC approach, many property owners find that FBi’s expertise, reduced stress, faster timelines, and guaranteed craftsmanship make it a smart long-term investment in a durable, reliable pole barn.
When determining the cost of a 30 x 40 pole barn, the final price depends on several factors, including your building location, material quality, design features, and whether you opt for a DIY kit or hiring a builder. A basic shell may start around $20,000–$30,000, while a fully customized or professionally built structure can reach $45,000 or more.
Investing in a high-quality post-frame building ensures long-term value, structural integrity, and lasting performance. Whether you’re building a garage, workshop, or hobby barn, FBi’s in-house engineering team, pre-manufactured trusses, and lifetime column warranties help protect your investment from the ground up.
If you’re ready to take the next step, explore our 30 x 40 building packages or request a custom pole barn quote to see what your project would cost in your area. Our team will help you design a pole barn that fits your needs, your budget, and your long-term goals—without sacrificing quality or peace of mind.
Do you have more questions that are not covered in this article? If you need help designing and planning, please contact FBi Buildings at 800.552.2981 or click here to email us. If you are ready to get a price, click here to request a quote, and a member of our customer engagement team will help you determine the next steps of your project.