A streamlined building method that uses factory-fabricated steel components, making it ideal for fast, affordable, and reliable construction.
Pre-engineered metal buildings (PEMBs) are becoming increasingly popular due to their ease of installation, cost efficiency, and versatility. These advantages make PEMBs a strong alternative to traditional construction methods and suitable for a wide variety of building types—topics this article will explore in detail.
In 2022, the global PEMB market was valued at $17.6 billion, and it’s projected to reach $46.6 billion by 2032, with a strong annual growth rate of 10.4% over the next decade.
Pre-engineered steel buildings first appeared in the 1930s, when complete kits were manufactured off-site and assembled on location. Initially, their use was limited to structures like aircraft hangars, agricultural storage, and the well-known Quonset hut.
Today, PEMB technology has advanced significantly, allowing for nearly any building shape or size to be pre-engineered. In fact, 40–50% of all low-rise buildings in the U.S. are now constructed using pre-engineered metal systems (according to MBMA).
In this article, we’ll cover what PEMBs are, their benefits and limitations, common applications, how the PEMB construction process works, and what to consider when it comes to cost.
Pre-engineered metal buildings (PEMBs) are structures made from steel components that are fabricated off-site in a factory and then shipped to the job site for assembly. These buildings come as customized metal building kits, including pre-cut columns, beams, frames, roofing, cladding, and other components—with pre-punched bolt holes designed to fit together quickly and accurately.
PEMBs provide several advantages over traditional construction methods such as wood framing, tilt-up concrete, or standard structural steel. Benefits include faster construction times, cost savings, reduced material waste, and the ability to create large, column-free interior spaces—ideal for warehouses, gyms, and other wide-open structures.
For a deeper look, check out our article on the advantages of pre-engineered steel buildings.
Let’s clear up some common terminology—PEMBs (Pre-Engineered Metal Buildings) are often known by other names, depending on the context or feature being described:
Rigid frame buildings – This refers to the strong, rigid steel frame that forms the backbone of a PEMB.
Portal frame structures – Named for the typical shape of a PEMB’s main frame, which resembles a large doorway or “portal.”
I-beam structures – Highlights the use of I-shaped steel members, with vertical webs and horizontal flanges, used for columns and roof beams.
Red iron buildings – Refers to PEMBs built with structural steel coated in red oxide primer to protect against rust before final painting.
Metal building kits – A broad term covering all the above, referring to complete, pre-cut, and pre-drilled building packages ready for assembly.
There are situations where a pre-engineered metal building (PEMB) is the clear solution—especially for warehouses, manufacturing facilities, shipping storage, and other structures that need wide, clear-span interiors. However, the versatile advantages of PEMBs—such as cost savings, speed, and durability—also make them a smart choice for many other building types as well.
PEMBs (Pre-Engineered Metal Buildings) offer significant cost advantages over traditional construction in several key areas:
Labor Savings: Since PEMB components are pre-fabricated off-site, less on-site labor is needed. Most buildings can be completed in under 8 weeks—much faster than the 6–12 months typical for conventional builds.
Transportation Savings: PEMB kits are delivered in a single shipment, keeping delivery costs low.
Material Efficiency: Precision engineering means minimal waste—helping reduce material costs by up to 30%.
Fewer Construction Errors: Every component is designed to fit a specific place. When builders follow the plans, costly mistakes are less likely.
Lower Insurance Premiums: Steel’s fire-resistant qualities often translate to reduced insurance rates.
Minimal Maintenance: Unlike wood-framed structures, PEMBs require virtually no upkeep.
Energy Efficiency: Tight building envelopes and quality insulation can lead to significant savings on heating and cooling.
While upfront costs for PEMBs may be slightly higher, the long-term savings in labor, energy, maintenance, and insurance make them a more cost-effective choice overall.
Steel is one of the strongest and most durable building materials available, capable of withstanding extreme conditions like hurricanes, tornadoes, heavy snow, and earthquakes.
Pre-engineered metal buildings (PEMBs) are specifically designed to meet local building codes, including requirements for snow loads, wind speeds, and seismic activity.
In addition to its strength, steel is non-combustible, offering excellent fire resistance. It also naturally resists pests, rot, and corrosion, making it a reliable, low-maintenance choice for long-term use.
With traditional construction, building components are typically fabricated and assembled on-site, often exposed to weather delays and environmental conditions. In contrast, PEMB components are manufactured off-site in a controlled environment, usually at the same time the job site is being prepared and the foundation is poured—helping speed up the overall construction timeline and reduce on-site risks.
Pre-engineered metal buildings (PEMBs) are significantly faster to construct than traditional building methods. Since all components are pre-cut, pre-drilled, and factory-fabricated, there’s no need for on-site cutting or welding. Plus, when everything comes from a single supplier, quality control is consistent from start to finish.
Once the building drawings are approved, the manufacturer typically takes just a few weeks to design and fabricate the parts. During this time, the builder can focus on site prep and foundation work, allowing for a smooth transition once the PEMB kit is delivered.
With this streamlined process, you can reduce your total construction time by up to 50% compared to conventional construction.
When your project requires expansive, open interior spaces without obstructive columns, pre-engineered metal buildings (PEMBs) are the ideal solution. Traditional construction struggles to efficiently support wide clear spans, making PEMBs the better choice for open layouts.
Standard single-span PEMB frames can reach up to 150 feet in width, and with advanced engineering, spans of up to 300 feet are possible.
For more information, check out our article on clear span buildings.
PEMB designs are highly customizable, allowing each building to meet the specific needs of the customer. From floor plans to exterior aesthetics, these structures can be tailored to match existing buildings or reflect your brand identity.
Customization options include:
Roof profile and pitch
Exterior cladding materials
Window and door placement
Color and finish selections
PEMBs are also designed with future expansion in mind, making it easy to add 20- or 30-foot bays as your space requirements grow.
PEMBs are built with airtight and waterproof designs, helping maintain indoor comfort with less reliance on insulation. In warmer climates, they can be equipped with cool metal roof colors that reflect sunlight and reduce heat buildup, improving energy efficiency and lowering cooling costs.
PEMBs are a sustainable building solution that can support certifications like LEED (Leadership in Energy and Environmental Design) and ENERGY STAR. Many PEMBs are constructed using low-carbon, recycled, or reclaimed steel—often up to 80%—which can contribute to LEED credits for Materials and Resources.
Their energy-efficient designs, paired with proper insulation, provide excellent thermal performance and help meet ENERGY STAR standards for reduced energy consumption.
Additionally, precision-fabricated components result in minimal on-site waste, supporting LEED points for Construction Waste Management.
The pre-engineered design of PEMBs makes future expansions simple and efficient. If you plan to expand later, be sure to request expandable end walls when placing your order. This allows you to easily add 20- or 30-foot bays down the line, making your building scalable to meet future needs.
Pre-engineered steel buildings (PEMBs) are built for long-term durability and require minimal maintenance, making them a cost-effective investment over time. Their steel components naturally resist pests, rot, and corrosion, which means significantly lower upkeep compared to traditional building materials.
Many PEMB manufacturers back their structures with extended warranties—often ranging from 20 to 50 years—covering both structural integrity and exterior finishes, offering added peace of mind.
Additionally, PEMBs can lead to long-term insurance savings. Thanks to their fire resistance, resistance to decay, pests, and natural disasters, insurance premiums are often lower than those for wood-framed buildings.
As efficient and versatile as pre-engineered metal buildings (PEMBs) are, they do come with certain limitations to keep in mind:
Aesthetic Considerations: While modern PEMBs offer a variety of exterior finishes, they may not achieve the same level of architectural detail or design flexibility as traditional construction.
Cost Factors: Although PEMBs offer long-term savings, upfront costs can be higher—especially with customizations. Costs may also spike when steel prices rise, as seen during the COVID-19 pandemic.
Structural Limitations: PEMBs are ideal for low-rise buildings with clear-span interiors, but they’re generally not suitable for mid- or high-rise construction, which often requires conventional framing systems.
Foundation Requirements: PEMBs concentrate loads at specific points, often requiring deeper, reinforced footings. They also perform best on flat, stable sites, which may limit options in challenging terrain.
Limited Flexibility After Construction: Once built, making major changes—such as adding bridge cranes, fire suppression systems, or rooftop equipment—can be complex and expensive due to the pre-engineered nature of the structure.
Structural steel buildings are often confused with pre-engineered metal buildings (PEMBs), but the two are distinct construction methods and serve different needs. Here’s how they compare:
Design Approach: Structural steel buildings are constructed on-site from individual steel components, offering full design flexibility. In contrast, PEMBs are pre-designed, factory-fabricated systems delivered as complete kits ready for assembly.
Construction Speed & Cost: PEMBs offer faster construction times and lower costs due to off-site fabrication and simplified on-site assembly. Structural steel buildings typically take longer to build, require more on-site labor, and are generally more expensive.
Connection Types: PEMB components are typically bolt-connected, while structural steel frames are welded on-site, allowing for more custom configurations but increasing labor intensity.
Application & Use Cases: PEMBs are ideal for warehouses, agricultural buildings, factories, and shop-houses, where cost-efficiency and functionality are priorities. Structural steel buildings, on the other hand, are better suited for complex or multi-story structures, especially those with custom architectural designs.
Ultimately, the best choice depends on the complexity and purpose of your project. If you’re constructing a multi-story, custom-shaped, or architecturally unique building, structural steel may be the better fit. But if you’re looking for a durable, low-maintenance, and cost-effective solution for a single- or two-story building, a PEMB is often the smarter option.
PEMBs can be as small as 100 square feet (e.g., Quonset huts or tool sheds) or as large as 100,000 square feet (e.g., warehouses, hangars, office buildings, etc.). The following are examples of typical applications for PEMBs.
Think warehouses, retail buildings, office buildings, community & government buildings, recreational facilities, etc. Faster code-compliant construction means faster ROI and the American Institute of Steel Construction (AISC) attests that today’s metal building construction methods are 50% faster than just a few years ago.
Houses, shop houses, and barndominiums come to mind – smaller, more compact residential structures that need to be functional rather than formal. Barndominiums, in particular, are taking advantage of the wide-open interior spaces for large open-concept living spaces.
The pre-engineered steel building construction process all starts with identifying the application the planned PEMB will serve. If you’re not looking for a pre-set kit, you’ll need to work with an architect or structural engineer to identify the design requirements and produce detailed plans.
Once the building drawings are approved, your PEMB provider will come in. They’ll start with design and engineering (using computer-aided design and manufacturing) to create the steel components and calculate loads.
Once the most optimal designs are made, the components are manufactured away from the project site.
While the structural members, bolts, cladding, and roofing are being prepared, the erection crew simultaneously prepares the project site by clearing, excavating, and pouring the foundations.
As soon as the PEMB kit is ready, it is delivered to the site and assembled. A detailed assembly manual is supplied with all kits.
The last phase is finishing. Once the building is fully assembled, the building erector can install the utility lines, add insulation, and install the doors, windows, vents, interior partition walls etc.
By the end, you’ll have a strong, dependable PEMB that will ably serve its application for decades.
See our metal building construction page for a more in-depth look at the process.
How much will a PEMB cost? To find out, you’ll need to consider the following:
Going the PEMB route will cost you more upfront, as the building components will be fabricated early in the construction process (as opposed to midway through with conventional building methods).
That said, the long-term savings will more than cover the initial cost premium.
Some physical factors will affect the final cost of your PEMB, such as:
While it’s difficult to compare the costs of PEMB with traditional construction costs, here’s a good ballpark figure to consider. The base price of a PEMB kit will be within the range of $15 to $25 per square foot.
Meanwhile, a wood-frame version of the same package would cost roughly $36 per square foot. That illustrates the long-term cost savings that make PEMB increasingly popular with builders, homeowners, and entrepreneurs.
See our metal building prices page for additional price/cost data.
Manufacturers of pre-engineered steel buildings have a network of dealers and suppliers nationwide. The dealers will help you design and specify your building before submitting the plans to the manufacturer. Here are some of the major manufacturers in North America:
Butler Manufacturing—Based in Kansas City, Missouri, Butler Manufacturing is one of the founding fathers of the metal building industry. With over 120 years of history, it is known for its innovative and flexible building solutions.
Nucor Building Systems—Nucor Building Systems is part of Nucor Corporation and has multiple locations, including its headquarters in Charlotte, North Carolina. For over thirty years, Nucor has been providing custom-engineered metal building systems. It has four manufacturing plants and over 1,300 authorized builders across North America.
Varco Pruden Buildings—Based in Memphis, Tennessee, Varco Pruden is known for its advanced design technology and large builder network
Behlen Industries—Based in Brandon, Manitoba, Behlen is one of Canada’s largest steel building manufacturers. It offers products that are simple to complex and custom-designed.
Robertson Building Systems – Located in Ancaster, Ontario, Robertson is part of the Cornerstone Building Brands family and offers prefab steel buildings for commercial, industrial, and institutional markets.
Steelway Building Systems – Based in Aylmer, Ontario, Steelway designs and fabricates steel building systems for agricultural, commercial, and recreational applications.
To sum up, PEMBs:
When looking for a PEMB supplier, you’ll want to check their track record for completed projects, experience in your desired building application, and a reputation for saving money for their customers. With so many suppliers, finding one that suits your needs may be challenging.
That’s where we come in. BuildingsGuide’s multiple quote service has been helping customers in the United States and Canada find their ideal PEMB vendors since 2004. Over the past 20 years, we have helped over 200,000 buyers save an average of 28% on their projects.
Let us help you find the best building solution for sale ……
To learn more about how a red iron building can work for your project or to receive personalized quotes from four leading suppliers, our team is ready to help you find the best solution from our network of trusted manufacturers.
Financing options for prefabricated buildings include traditional bank loans, personal loans, and financing through PEMB suppliers and construction loans. Some providers offer in-house financing or partnerships with lenders. Leasing, government, and farm loans may also be available, depending on the PEMB’s intended application and location.
Red oxide is iron oxide (Fe2O3), a rust-coloured compound used as a pigment and in rust-preventative primers. Red oxide primer is popular in the construction and manufacturing industries for coating steel. This primer has good adhesion and protects the metal from corrosion and rust, making it suitable for indoor and outdoor use.
