American Steel Structures, Inc.  BBB Business Review

30 x 40 Buildings

Get your custom 30x40 Metal Building with our best price: + Free Shipping and Installation!

30x40 Metal Building, Barn or Shop 

Get a custom prefab 30x40 metal building to use as an oversized garage, barn, shop, or similar purpose. Our buildings are delivered and installed for less than the cost of hiring a builder. In fact, they even cost less than a kit only from one of our largest competitors!

Factory Direct Prices

Our 30x40 building prices come directly from the factory, saving you thousands.

Quality, Certified Structures

Our 30x40 steel buildings come with a 20-year warranty on roofing and 12-gauge frames.

100% Satisfaction Guarantee

Cancel for any reason before delivery and get a full refund of your deposit.

Easy Online Ordering

Select your options to get instant pricing online. Secure your order with a small deposit.

30x40x11 Combo Metal Building

30x40 Metal Building Cost

The cost of your building depends on your location and the options you choose.  

30x40x10 Metal Building

30x40x11 Metal Building

30x40 Metal Building with Concrete Slab Cost

If you plan to use your building as a barn, you may be able to anchor it directly to the ground or a gravel foundation. But for most other uses you will need a concrete foundation.

A 30x40 building has 1200 square feet of space. A foundation for this size of building may cost between $7 to $10 per square foot, by hiring a local contractor to prepare the foundation for you. So expect to pay at least $8,400 to have a concrete slab poured for you. Learn more about recommendations for Concrete HERE.

Here’s Our Simple, Clear Process

  1. Select your options
  2. Order online with a refundable deposit
  3. Get your permit, if needed
  4. Prepare your site and foundation
  5. Get free delivery and installation

30x40 Metal Building, With Lean-To

Reasonable Lead Times

Most 30x40 buildings are delivered within one month after the building permit is approved and the foundation is ready. For current lead times in your area, ask your Design & Sales Representative as lead times vary dramatically across the country..

Installation is free and usually takes about 2-5 days for most buildings. 

Lifespan and Warranties

Steel buildings can last for well over 50 years with proper annual maintenance, making them a cost-effective long-term investment. Our 30x40 steel buildings come with a 1-year craftsmanship warranty and a 20-year warranty on roofing and frames. 

30x40 Metal Building with Lean-To

We can add barn-style lean-tos to one or both sides of your 30x40 building. These lean-tos can be open or enclosed. If you don’t see the option you are looking for in our 3D design tool, give us a call for details.

Thousands of Happy Customers!

“We love our new metal building from American Steel Structures! It took us awhile to decide what we wanted … I called them many times and each time they were super friendly and helpful! The installation crew was great! Even in 100 degree weather they got the job done!”

Tiffany G., Arkansas

“I am really happy with my Metal Building from American Steel Structures. After shopping around I found that they had the best product for the best price. The build your own building program on the website was easy to navigate. After purchase I was contacted by the factory team to verify the details. They were courteous and very helpful, they wanted to ensure the details were right. Once delivery was set up the building was fully erected in less than 12 hours. I love my new building”

David, Oklahoma

“This will be my second building from American Steel Structures. They are great. It may take a month to get your building but it’s worth the wait!. Super good quality, installed exactly as requested.”

Donna M., Texas

Design Your Own Customized Version below!

Great Support from Real People

Hi, I’m Darrel. This is my Son Chad, & my son-in-law Justin who runs our Missouri office! Just 3 of over 30 representatives across the country for American Steel Structures, standing by to serve you. Our goal is to help you get the exact building you need for the best possible price, without the stress and headaches that often come with a large purchase.

If you have any questions or need any help as you design your building, don’t hesitate to contact us by phone or email. We have an incredible team of knowledgable &  kind building specialists who can help you with just about anything. We are all friendly, down-to-earth people who will treat you right.

Metal Building Uses


30x40 Shed

A 30x40 shed has plenty of space to store lawnmowers, tools, and other equipment you use in the backyard or farm.

30x40 Barn

Farmers often use prefab metal buildings for storing equipment, storing hay, and sheltering animals.

30x40 Shop

A 30x40 shop has almost 600 square feet of floor space. If you will be working in your shop, you will probably want to add insulation to help regulate the temperature. Another good idea is to choose a light-colored roof (like white) to maximize the energy efficiency of your shop building.

30x40 Metal Building, Vertical Sides/Ends

Horizontal Sides & Ends - Vertical Roof

Design Options

Custom Colors

You can choose from 16 color options for the roof, sides, and trim of your 30x40 metal building. There isn’t any extra charge for your custom color selections.

Roof Styles

Your 30x40 metal building is available in three roof styles:

The vertical roof style has vertical panels that run from the ridge to the eaves. These roof panels allow rain, snow, leaves, and other debris to slide off your roof. The vertical roof is also the strongest option, having added hat-channel purlin grid horizontally.

The regular roof style has rounded corners at the eaves and uses horizontal panels that run from the front of the building to the back. This is our least expensive roof style, but you need to be sure to clean off leaves so they don’t build up on the ridges of the horizontal panels. (Most of our Shops REQUIRE vertical roof for any structure 40' or longer.)

The boxed-eave style is between the other two styles. It has a traditional A-frame look like the vertical style, but it uses horizontal roof panels like the regular roof style. (Most of our Shops REQUIRE vertical roof for any structure 40' or longer.)

Most of our customers who buy a 30x40 metal building choose the vertical roof style.

Doors and Windows

We have many options for roll-up garage doors. You can also choose between three styles of walk-in doors and windows.

If you want to add your own doors, windows, or other openings, we can add custom frame-outs for a small fee.


You have three options for insulation:

  1. No insulation
  2. Double-bubble insulation to control condensation ($1.50 per square foot)
  3. R-17 insulation for temperature and moisture control ($3.00 per square foot)

Advantages of 30x40 Metal Buildings

Durability and Strength

Our metal buildings are designed to withstand the unique weather patterns of each region we operate in. In northern states our buildings are certified for heavy snow loads, and down Soiuth from Texas to Florida our buildings are designed to withstand hurricane-force winds. In the Midwest and other central states our buildings are certified for a balance of wind and snow conditions. You can choose to upgrade your certifications for even more peace of mind. You can also choose to get thicker steel frames, roofing, and siding as optional upgrades.

Low Maintenance Requirements

Metal buildings require very little maintenance. We recommend an annual inspection, cleaning, and quickly treating any small rust spots that you see in your annual inspection. A well-maintained metal building can last well over 50 years and rarely require expensive repairs that are typically associated with a wood building with a shingle roof.

Quick Construction Time

Most of our 30x40 metal buildings are erected in one or two days, and the installation crew carries all the required insurance to protect you from liability during the construction process. Ordering a metal building from American Steel Structrures can be a relatively simple way to get a metal building installed without the usual headaches of a large construction project.

More Info

For more information about our metal buildings, see our main Metal Buildings page.