Top 33 Mechanical Construction Companies to Watch in 2024

Mechanical construction companies provide an array of services that make our spaces inhabitable and functional. This includes heating and cooling systems, refrigeration, piping, and plumbing. Even electrical systems can be considered part of mechanical construction, but we consider electrical construction companies to be their own segment. 

Mechanical contractors have a long list of responsibilities that encompass production, installation, ongoing maintenance, and repair. Their fingerprints are on every building we enter—from homes, offices, and schools, to our courthouses, entertainment centers, and hotels. 

There are more than 8,000 mechanical companies in the US. Jobs in this market are expected to grow by 4% by 2028. And the mechanical construction services market as a whole is projected to grow by $70.44 billion over the next three years. This represents a compound annual growth rate (CAGR) of 6.52%. 

Top 33 Mechanical Construction Companies

We like to keep track of the top players and trade contractors in the space. Engineering News-Record publishes a great list every year—the ENR Top 600—to report on the largest firms in various segments of the construction industry. It’s a helpful tool to monitor who’s who in the construction space. But we often find that the biggest doesn’t always mean the best. 

We’re most interested in the intersection between revenue and growth. So we took a look at the most recent ENR Top 600 to see which firms on it demonstrated positive revenue growth. There are 33 mechanical construction companies on ENR’s list that grew last year. Revenues ranged from $100 million to $4.5 billion. Some of them grew by as much as 76%.

Here’s our list of top mechanical construction companies.

10 Fastest-Growing Mechanical Construction Companies to Watch

As we mentioned before, we believe that growth is an important measurement of business health. It’s pretty impressive when companies that generate nine to ten figures in revenue are able to grow at double-digit rates. 

Ten of the mechanical construction companies on this list grew by an astounding 25% or more. It’s definitely worth taking a close look at these leaders for blueprints and opportunities that can lead to growth.

1. John E. Green Co.

Headquarters: Highland Park, MI

Founding Year: 1909

Company Size: 1100+ team members

Revenue: $324 million

YOY Growth: 76%

John E. Green Company is a fourth-generation family-owned and operated mechanical contractor. It takes pride in being one of the country’s only mechanical contractors with ISO 9001 and ISO 14001 certifications.

The company is one of the most diversified, full-service mechanical, fire protection, and service contractors. Its capabilities include the fabrication and installation of plumbing, HVAC, process piping, and fire protection systems for projects of any size. More than 600 team members and 500 tradespeople make up its team.

John E. Green will take on any project of any size, especially in automotive, commercial, education, government, food service, healthcare, industrial, municipal, pharmaceutical, and resort/entertainment industries.

Learn more on John E. Green Co.’s website.

2. RK Industries LLC

Headquarters: Denver, CO

Founding Year: 1963 

Revenue: $191 million

YOY Growth: 62%

RK Industries is another family-owned mechanical contractor, in its second generation of leadership. It’s evolved significantly over the last six decades and in 2021 changed its corporate structure and legal name. (The company was previously called RK Mechanical.)

It offers a range of mechanical construction services— plumbing, mechanical, steel, electrical, and water solutions—in addition to manufacturing, fabrication, and building service solutions. In-house capabilities include budgeting and preconstruction, virtual design and construction (VDC), and operations.

RK serves more than 20 industries across most of the US, with secondary markets in Canada, Mexico, and parts of Europe. Marquee projects include the Salt Lake City International Airport and the Colorado Convention Center.

Learn more on RK Industries’ website. 

3. HB Global LLC

Headquarters: Camp Hill, PA

Founding Year: 1914 

Revenue: $349 million

YOY Growth: 35%

HB Global started as a trusted HVAC contractor providing residential and commercial heating, cooling, and plumbing installation and services. The company became an employee-owned ESOP in 2010. Over the last decade, it’s been executing an aggressive acquisition strategy, bringing 20 other companies into the fold. 

The firm’s commercial unit is HB Mechanical Group. This unit consists of eight brands that build mechanical, electrical, and plumbing systems to power healthcare, biotechnology, government, manufacturing, distribution, hospitality, and education spaces.

2100 employee-owners across 18 offices provide unmatched services throughout the United States and the Caribbean. The Orlando Health Lake Mary Hospital is among HB Global’s noteworthy projects.

Learn more on HB Global’s website. 

4. US Engineering Co. Holdings

Headquarters: Kansas City, MO

Founding Year: 1893 

Revenue: $469 million

YOY Growth: 35%

US Engineering Company represents five generations of mechanical contracting. It’s been around for 130 years, focusing on reducing the total cost of building ownership. It does this through a holistic approach to construction, plumbing, piping, and sheet metal systems that improves building operations and lowers energy consumption.

The firm primarily serves hospitals, data centers, commercial buildings, educational institutions, and industrial plants, with some entertainment, hospitality, and laboratory spaces. Its service includes everything from project scheduling, cost estimating, and systems analysis to value engineering, constructability analysis, and coordination drawings.

US Engineering has a long list of projects across 48 states. Some of its major developments include the Kansas City International Airport Terminal & Parking, Colorado State University Football Stadium, and Kauffman Center for the Performing Arts.

Learn more on US Engineering Co.’s website.

5. Icon Mechanical

Headquarters: Granite City, IL

Founding Year: 1995

Revenue: $169 million

YOY Growth: 33%

Icon Mechanical is one of the younger companies on this list. It’s a full-service mechanical contractor that applies a thoughtful engineering approach to complex design-build and design-assist projects for commercial and industrial markets.

The firm specializes in the design, installation, modification, and ongoing service of piping, industrial ventilation, commercial HVAC, and industrial process equipment. It also offers heavy metal fabrication, piping fabrication, and sheet metal fabrication.

Icon Mechanical strives to guarantee continuity, quality, safety, and flawless delivery for each project. Its portfolio includes impressive clients like Anheuser Busch, Kraft Foods, General Motors, GlaxoSmithKline, and Washington University.

Learn more on Icon Mechanical’s website.

6. Murphy Co.

Headquarters: St. Louis, MO

Founding Year: 1907

Revenue: $408 million

YOY Growth: 31%

Murphy Company is a mechanical contractor serving commercial, industrial, and institutional clients. The firm’s commitment is to deliver “unsurpassed quality, timely execution, and excellent value for a fair price.”

It takes a diverse approach to building its book of business so that it can survive and thrive in the often tumultuous construction industry. So it offers a wide range of capabilities, including construction, clean manufacturing, building automation controls, 24-hour mechanical service, data center services, refrigeration, and healthy building solutions.

More than 300 salaried employees and about a thousand union craft workers (pipefitter, boilermaker, plumber, sheet metal, HVAC, and laborer trades) serve its customers. They’ve been responsible for some well-known buildings like the St. Louis MLS Stadium and Microsoft’s Cheyenne Campus

Learn more on Murphy Co.’s website.

7. Helm Group

Headquarters: Freeport, IL

Founding Year: 1946

Revenue: $280 million

YOY Growth: 26%

Helm Group was founded in 1946 as Freeport Blacktop Construction Company, but its roots go all the way back to the 1880s. It’s spent a long time building a reputation as one of the most skilled mechanical construction companies in the Midwest. 

Services include HVAC, paving, electrical, service and facility management, plumbing, building automation and controls, fabrication, modularization and assembly, and waste and water treatment. It takes a process-oriented approach to create accurate budgets, stay on schedule, and improve project plans and specifications.

Helm Group takes on projects of all sizes, primarily throughout the Midwest. Project highlights include O’Hare International Airport, major rehabilitation on the Mississippi River, and Chrysler and Ford plants. 

Learn more on Helm Group’s website. 

8. Letsos Co.

Headquarters: Houston, TX

Founding Year: 400 employees

Revenue: $134 million

YOY Growth: 26%

Letsos is a mechanical contracting company that provides new construction and maintenance services. It’s proud of its excellent fiscal history and conservative financial strength. 

Commercial, medical, Institutional, industrial, educational, and food service companies turn to Letsos for HVAC, plumbing, sheet metal, and piping. The firm provides end-to-end services including budgeting, preconstruction, prefabrication, and 24/7 service and maintenance. It also has a special projects division that provides a range of capabilities tailored to smaller projects under $5 million.

Letsos has more than 400 employees who serve an impressive client roster, like Texas Children’s Hospital, Texas A&M University, Bayer, Hines, and Gilbane. 

Learn more on Letsos Co.’s website.

9. R.T. Moore Co. Inc.

Headquarters:  Indianapolis, IN

Founding Year: 1955

Revenue: $156 million

YOY Growth: 26%

R.T. Moore Company is a family-owned and operated mechanical contractor for commercial and residential clients. It has offices in Indiana, Ohio, and Florida with more than 800 people. 

The firm is considered a leader in HVAC, plumbing, sewer, and water systems and service for commercial and residential projects. Commercial projects include in-house engineering, computer-assisted design and drafting (CAD), and 3D building information modeling. Residential projects include furnace, heating, air conditioning, and plumbing repair and maintenance.

R.T. Moore is best known for high-rise apartments, assisted living facilities, student dormitories, and five-star hotels, including Ritz and Hyatt House.

Learn more on R.T. Moore Co.’s website.

10. MSS Solutions

Headquarters: Charlotte, NC

Founding Year: 1996

Revenue: $123 million

YOY Growth: 25%

MSS Solutions is a full-service mechanical contractor that offers design-build, design-assist, and complete implementation services. It focuses on making facilities across the Carolinas and throughout North America more efficient, comfortable, secure, and reliable.

It supports commercial offices, healthcare, industrial and manufacturing, hospitality, public facilities, and education markets. Service lines include HVAC service, mechanical design and construction, fire alarm safety, security systems, building automation, network and systems integration, and energy management and analytics. 

Despite MSS being a younger company, some of the country’s largest hotel franchises, financial institutions, utility providers, and retailers choose it as their sole provider. Noteworthy projects include Atrium Health, Credit One Stadium, and the Fairfield Inn.

Learn more on MSS Solutions’ website.

What Every Contractor Can Learn from These Top 10 Leaders

It’s inspiring to realize that many of the ten fastest-growing mechanical contractors started as solo tradespeople 100 years ago. There’s a lot we can learn from their example to create a clear path for other trade contractors to succeed. 

We see a few important trends across this group (and within growing construction companies as a whole).

• Diversify your offering. All of these companies offer multiple service lines for various markets. 
• Remember that your people are your most important asset. We see a consistent commitment to safety and culture across these firms, with some of them going so far as to create employee-ownership models.
• Level up your resources and take hold of your financial forecast. Some small but smart changes can free up capital so you can bid on more projects. 

Construction billing software, like Siteline, is built to help mechanical contractors have more working capital to bid on more projects by ensuring they get paid on time. It creates a ton of efficiency across accounting teams and gives greater visibility into companies’ overall financial health. It can make a world of difference in scaling a profitable contracting company. Schedule a demo to see how Siteline works.

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