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

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Concrete Pad Size Calculator

Use this calculator to estimate the concrete pad size required for your building.

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Recommended concrete pad size for your 12’ x 20’ metal building: 13’ x 21’
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Learn More About Concrete Pads for Metal Carports and Garages

Your concrete pad should be one foot wider and one foot longer than the size of the carport or metal building you are ordering.

The reason for the larger pad recommendation is that the engineers who designed the metal structures recommend a 6” curtain of concrete on every side. This ensures proper anchoring and helps prevent potential concrete cracking at the perimeter.

We would encourage you to check with your local building codes to determine the pad size, pad thickness, footing requirements, or any other regulations you must adhere to. Local building codes will always supersede our recommendations.

Alan’s Factory Outlet can deliver and install a metal building after your concrete slab has been poured. We don’t pour concrete slabs, so you will need to hire a local concrete contractor or do it yourself.

To prevent water from pooling next to the base rail of your building, it’s recommended to lower the six-inch ledge around your building by ¾”. You can show the image below to your concrete contractor for reference.

Do you have a general question?

Get quick answers to common questions in our Help Center, an extensive knowledge base available 24/7.


Do you need something specific?

Please fill out the form on this page, or call us at 1-800-488-6903 (M-F, 9-5 Eastern).

Customize Your Own Metal Garage or Carport With Our 3D Builder

Easily design, price, and buy online — plus get free delivery and installation!

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Your Zip Code helps us provide the exact price for your location as construction specs vary depending on code requirements for each state.

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