What John E. Green Company does

John E. Green Company (JEG) is a 117-year-old, fifth-generation family-owned mechanical contracting firm headquartered at 220 Victor Avenue, Highland Park, Michigan. Founded in 1909 by John E. Green with $20 in cash and incorporated in 1934, the company delivers mechanical, plumbing, HVAC, fire suppression, process piping, fabrication, design-build, and 24/7 emergency maintenance services for large-scale commercial, industrial, and institutional construction projects. With 1,000+ corporate and skilled-trade employees, contractor licenses across seven states (Michigan, Alabama, Indiana, Kentucky, North Carolina, Ohio, and Tennessee), and operations spanning the Eastern half of the United States, JEG is recognized by Engineering News-Record as a 2025 Top 600 Specialty Contractor and by Crain's Detroit Business as a Top 200 Largest Privately Held Company.

JEG's technical stack is anchored in Building Information Modeling (BIM) and Virtual Design and Construction (VDC), delivered through Autodesk BIM 360/Build with 3D scanning and Trimble Total Station layout tooling for installation precision. The company operates more than 200,000 square feet of fabrication and warehouse capacity — including a 30,000 sq ft Saginaw Corporate Fabrication Shop, a 29,000 sq ft Saginaw Assembly Building, an 11,000 sq ft Highland Park Fab Shop, a 125,000 sq ft Highland Park Corporate Warehouse, and an 85,000 sq ft Grand Blanc facility. Its in-house Design Build Division fields more than 25 engineers, designers, and VDC professionals. The firm holds ISO 9001:2015, ISO 14001:2015, ASME PP/R/U stamps, EPA Lead-Safe, NICET, Michigan Act 144, MSCA, and STAR certifications, with safety metrics of EMR 0.56, DART 0.60, and RIR 1.03.

JEG generates revenue through project-based specialty contracting — fixed-price, GMP, IPD/IFOA, and time-and-materials contracts — delivered both directly to project owners and construction managers and as a subcontractor to general contractors. Anchor engagements disclosed in the data include the $202.77 million Ultium Cells (GM-LG Venture) battery plant in Warren, OH; the $50.42 million University of Michigan Clinical Inpatient Tower in Ann Arbor; the $39.66 million Ford Michigan Central Station adaptive-reuse project; and the $13.61 million Sartorious Operations Center Laboratory. A 24/7 emergency maintenance business and planned maintenance agreements supplement project-installation revenue with recurring service work. The company surpassed $500 million in revenue in 2023, doubling from its 2012 base under President & CEO Michael J. Green.

Name

John E. Green Company

Legal name

John E. Green Company

Website

https://johnegreen.com

Company type

Private

Founded year

1909

Operating status

Operating

Headcount range

501–1,000 employees

Short description

John E. Green Company is a 117-year-old, family-owned mechanical contracting firm headquartered in Michigan that delivers mechanical, plumbing, HVAC, fire suppression, process piping, fabrication, and design-build services for large-scale commercial, industrial, and institutional construction projects across the Eastern United States.

Ownership category

akta.pro rank

Headquarters

HQ city

Highland Park

HQ country

United States

HQ region

North America

Offices9 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Supply Chain, Operations, Technology or R&D, Infrastructure, Marketing or Sales

Revenue model

1. Mechanical/Process Piping Installation: Project-based installation of process piping systems for automotive plants including paint systems, E-Coat/Phosphate setups, robotics integration, and battery plant piping for EV electrification. Revenue generated through fixed-price contracts, GMP contracts, IPD/IFOA arrangements, and time and materials work.
2. Plumbing Services: Commercial and industrial plumbing installation and service including domestic water, sanitary waste, medical gas, and industrial waste systems. Licensed operations in Michigan, Alabama, Ohio, and Tennessee.
3. HVAC Installation and Service: Complete HVAC system installation and maintenance services including high/low pressure steam, chilled water, heating hot water, computer room space conditioning. Licensed in Michigan, Alabama, Indiana, Kentucky, North Carolina, Ohio, and Tennessee.
4. Fire Suppression Systems: Design, installation, and maintenance of fire suppression systems for industrial, automotive, battery plants, educational, and institutional facilities. State of Michigan Act 144 Certified, NICET certified designers, NFPA and NFSA members.
5. 24/7 Emergency Maintenance Services: Round-the-clock emergency maintenance and repair services including HVAC, plumbing, fire suppression, backflow testing, medical gas, boiler installations, and refrigeration. Provided under custom planned maintenance agreements or on-call service.
6. Design Build Services: Comprehensive design-build services including mechanical engineering, professional engineering, design assist, and VDC services. Staff of over 25 engineers, designers, and VDC professionals specializing in automotive, EV battery plants, clean room, and commercial projects.

Pricing tiers

Go-to-market motion1 record

Distribution channels4 records

Marketing channels5 records

Core offering

John E. Green Company is a specialty mechanical trade contractor providing design-build, fabrication, installation, and maintenance services for plumbing, HVAC, process piping, and fire suppression systems. The company self-performs work as a subcontractor to general contractors or directly with project owners on large-scale commercial, industrial, healthcare, automotive/EV, educational, and institutional projects across the Eastern half of the United States. Operations are supported by more than 200,000 sq ft of fabrication facilities and 25+ in-house engineers and VDC professionals.

Product overview

John E. Green Company (JEG) is a private family-owned mechanical and fire suppression contractor established in 1909, offering a comprehensive portfolio of integrated services as a single unified offering rather than a platform-plus-modules architecture. The company's core services include Piping (Process Piping for automotive and industrial applications), Plumbing (commercial and industrial), Fire Suppression (design, installation, and maintenance), HVAC (heating, ventilation, and air conditioning), Fabrication (multi-location pipe fabrication and prefabrication), Design Build (in-house engineering and VDC with 25+ professionals), and 24/7 Emergency Service. These services are delivered through multiple office locations across Michigan (Corporate Highland Park, Ann Arbor, Detroit, Design Build Division in Southfield, Lansing, Petoskey, Eastport, Saginaw), Nashville TN, and support operations across the Eastern half of the United States. The company operates multiple fabrication facilities totaling over 200,000 square feet and employs over 1,000 corporate and skilled trade workers. Recognized by Engineering News Record as one of the largest specialty contractors in the United States and listed on ENR's Top 600 Specialty Contractors and Crain's Detroit Business Private 200.

Differentiator

Problem solved

Functional benefit

Products and services

• Process Piping Installation of diverse process piping systems for automotive plants including paint systems, E-Coat/Phosphate setups, robotics integration, battery production systems for EV electrification, hydrogen fueling systems, chemical production equipment, and compressed natural gas fueling systems.
• Plumbing Commercial and industrial plumbing installation and service covering domestic water, sanitary waste and vents, high-purity water systems, storm drainage, compressed air/vacuum systems, medical gas distribution, food service equipment, municipal water and waste treatment, industrial waste handling, hazardous waste systems, and backflow preventer testing.
• Fire Suppression Design, fabrication, installation, inspection, testing and maintenance of fire suppression systems for industrial, automotive, battery plants, educational/institutional, and storage applications, including fire pumps, underground systems, water-based systems, dry pipe systems, pre-action systems, and deluge systems.
• HVAC Complete HVAC system installation and services including high and low-pressure steam, condensate piping, chilled water, heating hot water, high-temperature hot water systems, computer room space conditioning, building HVAC solutions, sheet metal, and building automation. Licensed in Michigan, Alabama, Indiana, Kentucky, North Carolina, Ohio, and Tennessee.
• Fabrication Precision piping fabrication, rack assembly, and prefabrication services across multiple facilities including a 30,000 sq ft Corporate Fab Shop in Saginaw, 29,000 sq ft Assembly Building, 11,000 sq ft Fab Shop in Highland Park, 125,000 sq ft Corporate Warehouse in Highland Park, and an 85,000 sq ft Grand Blanc facility. Produces pipe racks, pipe risers, valve stations, process systems, coil connections, mechanical room equipment, toilet rooms, pump skids, and plumbing pipe.
• Design Build Integrated design-build services with a staff of over 25 engineers, designers, and VDC professionals providing mechanical engineering, professional engineering, design assist, 3D design using Autodesk software, BIM modeling, and Virtual Design and Construction (VDC) across automotive, EV battery plants, clean room/dry room, commercial, and institutional projects.
• 24/7 Emergency Service Round-the-clock emergency maintenance and repair services for mechanical, plumbing, and fire suppression systems including HVAC maintenance, plumbing service, backflow protection testing, medical gas and vacuum systems, thermal imaging, fire suppression inspections, refrigeration piping, mini splits, VRF systems, retrofits, steam and condensate systems, boiler installations, CSD-1 boiler testing, and cooling tower/heat exchanger services.

Quantifiable outcome

• Doubled revenue to over $500 million since 2012
• +5 more outcomes

Named customers5 records

Segments8 records

Ideal customer profiles5 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature3 records

Scale indicators12 records

Recent moves5 records

Expansion highlights5 records

Broad incumbents

• Gilbane Building Company: Large privately-held construction firm with substantial mechanical contracting capabilities and national presence. Comparable in self-perform capabilities and family-ownership heritage.
• APi Group: Global leader in safety, specialty, and industrial services with significant fire suppression and mechanical contracting operations. Direct overlap with JEG's fire suppression and HVAC service lines through subsidiary businesses.
• EMCOR Group: Largest publicly-traded mechanical and electrical contractor in the US offering HVAC, plumbing, fire suppression, and building automation across all major end markets. Much larger scale than JEG but directly overlapping service portfolio.

Direct peers

• Power Design: Large privately-held mechanical and electrical contractor with national presence in multifamily, commercial, and industrial construction. Comparable scale and integrated MEP delivery model to JEG.
• Limbach Holdings: Specialty mechanical systems contractor with similar design-build, HVAC, plumbing, and process piping focus. Publicly-traded peer with comparable business model and customer mix including healthcare, education, and industrial sectors.
• Shambaugh & Son: Large mechanical and fire protection contractor serving industrial, healthcare, education, and commercial markets in the Midwest. Direct comparable in size, services, and geographic footprint.
• Comfort Systems USA: National mechanical contractor providing HVAC, plumbing, and piping services for commercial and industrial customers. Comparable to JEG in core service offerings, though Comfort Systems operates at significantly larger scale across more geographies.
• IES Holdings: Mechanical and electrical contractor serving commercial, industrial, and residential markets with similar project-based delivery model. Comparable in size and operational scope to JEG.

Emerging players

• MYR Group: Specialty contractor focused on electrical construction with transmission, distribution, and commercial/industrial work. Comparable in scale and project-based contracting model, though focused on electrical rather than mechanical trades.

Regional players

• Crown Corr Inc. Midwest mechanical contractor with fabrication capabilities serving automotive, industrial, and commercial markets. Comparable in regional focus and fabrication-integrated delivery model.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/johnegreencompany

Compliance5 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles5 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about John E. Green Company