Free delivery and quick, free installation
Refundable small deposit to order
20-year warranty on 12-gauge orders

Get your custom building at our factory direct prices with free delivery and installation!

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20×30 Metal Building, Shed, Barn, or Shop [+ Slab Cost]

Get a custom prefab 20×30 metal building to use as a shed, 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!

24x30x14 Metal Building

Get a Metal Building, Shed, Barn, or Shop at Unbeatable Factory-Direct Prices

Instant Transparent Pricing

At Alan’s, we have nothing to hide. Get instant pricing online. No contact details required. No unwanted sales calls.

Fast Delivery Times

Most of our metal buildings are delivered and installed within 30 to 60 days. Delivery and installation is free.

Certified Metal Buildings

Get a 1-year craftsmanship warranty plus a 20-year rust-through warranty on optional 12-gauge framing and most roof panels.

Risk-Free Guarantee

We guarantee a 100% refund of your deposit until the day your building is delivered. We don’t know anyone who will match our guarantee.

20×30 Metal Building Cost

The cost of your building depends on your location and the options you choose. The prices below are approximate and include 3 garage doors. You should use our online cost calculator to get an exact price.

20×30 Metal Building
SizeApprox. Base Price*
20x30x9 Metal Building$6,500
20x30x10 Metal Building$7,000
20x30x12 Metal Building$9,000
20x30x14 Metal Building$9,500
* Prices for vertical-roof buildings. Regular-roof buildings are less expensive.

20×30 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 20×30 building has 600 square feet of space. A foundation for this size of building may cost between $3 to $12 per square foot, depending on whether you pour it yourself or hire a local contractor to prepare the foundation for you. So expect to pay at least $1,800 for a DIY foundation, and at least $4,800 to have a concrete slab poured for you.

Here’s Our Simple, Clear Process

  1. Select your options
  2. Order online with a refundable deposit
  3. Get a permit
  4. Prepare your site and foundation
  5. Get free delivery and installation
20×30 Metal Building, Side View

Reasonable Lead Times

Most 20×30 buildings are delivered within two months after the building permit is approved and the foundation is ready. For current lead times in your area, see our estimated lead times.

Installation is free and usually takes about 1-2 days. 

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 20×30 steel buildings come with a 1-year craftsmanship warranty and a 20-year warranty on roofing and 12-gauge frames. 

20×30 Metal Building with Lean-To

We can add barn-style lean-tos to one or both sides of your 20×30 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


“I am really happy with my metal Building from Alan’s Factory Outlet. After shopping around I found that Alan’s 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 Alan’s 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 about 12 hours. I love my new building”

– Michael, Alabama, 24×35 Metal Building

“This will be my third building from Alan’s. They are great. It may take two months to get your building but it’s worth the wait when necessary. Very good quality, installed exactly as desired.”

– Donna R., Georgia

“We love our new metal building from Alans! It took us awhile to decide what we wanted … I called Alans 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!”

– Faith L., Arkansas

Great Support from Real People

Hi, I’m Alan. My 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. I have a small team of incredibly 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

20×30 Shed

A 20×30 shed has plenty of space to store lawnmowers, tools, and other equipment you use in the backyard or farm.

20×30 Barn

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

20×30 Shop

A 20×30 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.

20×30 Meal Building, Inside View

Design Options

Custom Colors

You can choose from 16 color options for the roof, sides, and trim of your 20×30 metal building. There isn’t any extra charge for your custom color selections.

Roof Styles

Your 20×30 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.

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.

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 customers who buy a 20×30 metal building choose the vertical roof style.

Doors and Windows

We have many options for roll-up garage doors. You can also choose between two 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 20×30 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 in Florida our buildings are designed to withstand hurricane-force winds. In the Southeast 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 20×30 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 Alan’s Factory Outlet 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.

Customize, Preview, and Order Your Metal Building Online

Price and Buy Online with Our 3D Builder, Plus Get Free Shipping and Installation!

  • Select a size to meet your needs
  • Choose roof, side, and trim colors
  • Add garage doors, windows, and walk-in doors
  • Customize additional options
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