Metal Building Sizes

Listed below is a selection of the most common sizes for steel framed structures. These base kit packages include all primary and secondary framing, roof, and wall siding panels, and two framed openings. To suit your intended application, you then customize this basic structure to include doors, windows, skylights, etc.

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standard size metal building kit package

Made in USA
Steel I-Beam
Custom Kits
30 Yr Warranty

Common Standard Metal Building Sizes

30x40 Building Kits

The "30x40" 'Red Iron' building is the 'workhorse' of the prefab building world, providing 1,200 square feet of column-free space. It is ideally suited to end uses, including multi-car garages, small workshops, storage barns, or as a small warehouse. Pick a standard height of 10' to 22' to meet your access requirements. All kits are manufactured to your specification and can be installed by a professional crew in as little as 2-3 days.

Specs & Features

30x50 Buildings

A 30'x50' steel building is a great investment for anyone looking for a durable structure for a home, hobby, or farm outbuilding storage solution. With 1,500 sq ft of clearspan space, this structure can be used for various applications, including - large garages, mechanic shops, and ag storage buildings. With its durable construction and many customization options, a 30x50 building can be tailored to fit your specific storage requirements.

Specs & Features

30x60 Buildings

With 1,800 sq. ft. of wall-to-wall space, prefab 30'x60' buildings are well suited to various end uses. They offer ample floor space for diverse applications such as outbuildings, commercial dog kennels, RV garages, and even mid-sized family homes. A building of this size can be ready for occupancy in as little as 3-5 days with a professional crew or in as little as a week for a DIY build.

Specs & Features

40x60 Building Kits

The “40 by 60" is the market's #1 selling metal frame building. Its versatile 2,400 square feet of clear-span space is well suited to light industrial, residential, and farm applications. The generous floor space gives you many layout options and floor plan possibilities (even more if you add a second story!). Popular applications include flex warehousing, workshops, shops with living quarters (Shouses), and family-sized homes. Engineered with durable solid I-beam steel framing.

Specs & Features

40x80 Buildings

Bolt together 40'x80' buildings are built to last, are engineered to withstand the harshest environments, and come with warranties of 30+ years. They're also virtually maintenance-free. For a slightly higher investment, you get a custom, commercial-grade, solid steel framed (not light gauge) building that adds value to your property.

Specs & Features

50x80 Buildings

Looking for a cost-effective, maintenance-free building solution that’s built to last? Prefabricated 50'x80' metal structures are made from American-made steel and are engineered to meet your local building codes. With 4,000 sq. ft. of unobstructed space, they are ideal for large Shouses, retail spaces, office warehouses, and more. All building kits are manufactured to your specifications and can be customized to suit your specific application.

Specs & Features

50x100 Buildings

With 5,000 sq ft of clearspan space, pre-engineered 50'x100' steel buildings are one of our most versatile and popular commercial buildings on the market. They are ideally suited to modern warehousing facilities, professional auto repair shops, large open-concept Barndominiums, and more. All buildings are custom engineered to meet your local codes, and their bolt-up design makes them a fast and economical construction option.

Specs & Features

60x100 Steel Building

With 6,000 sq. ft. of wall-to-wall space, prefab 60x100 buildings are well suited to various end uses. They offer ample floor space for diverse applications such as office warehouses, auto shops, and even large shop houses. A building of this size can be ready for occupancy in as little as 6-8 weeks with a professional steel erection crew.

Specs & Features

Common Questions

  • What are standard metal building sizes?

    There is no one-size-fits-all answer to this question, as the size of a steel structure can vary depending on its intended use and the needs of the owner. However, some standard steel building sizes are commonly used in the industry.

    Standard sizes for metal structures include widths ranging from 30 to 300 feet, lengths ranging from 30 to over 500 feet, and eave heights ranging from 8 to 30 feet. However, all buildings can be customized to meet your specific size requirements.

    Some common standard sizes include:

    30 Ft Wide 40 Ft Wide 50 Ft Wide 60 Ft Wide 100 Ft Wide
    30x40x10 40x40x16 50x50x16 60x40x12 100x100x20
    30x40x12 40x50x16 50x60x16 60x40x16 100x150x20
    30x50x14 40x60x12 50x80x16 60x80x20 100x200x20
    30x60x16 40x60x16 50x100x20 60x100x20 100x300x22

  • What are the most common metal building sizes?

    The most popular sizes for steel buildings vary depending on the intended use, but some common sizes include:


    These sizes are often used for commercial, industrial, or agricultural buildings. Please note that a metal building's dimensions can easily be custom manufactured to virtually any size to suit your chosen application.

  • What is the most economical metal building size?

    The most economical size depends on various factors, such as the intended use, location, and budget. In general, smaller structures with simpler designs and fewer features tend to be more economical.

    Due to economies-of-scale, metal framed buildings ranging from 3,000 to 10,000 square feet have a lower cost per square foot compared to larger structures of 10,000 square feet or more, where the price per square foot increases again.

    It is also more economical to reduce the width of the building and increase the length. Also, try to keep the height to a minimum, as this will also add to your overall cost and have an impact on heating and cooling costs.

    For additional details, see our page on metal building prices

    A structure with a perfectly square shape, regardless of its size, provides the maximum amount of square footage with the least amount of perimeter walls required.

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