Company: LGN
Filing Date: 2025-08-25
Form Type: S-1/A
Source: 0001193125-25-186788
Chunk: 168

Company: Legence Corp.
Filing Date: 2025-08-25
Form: S-1/A
Chunk 168
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 revenues from selling Program & Project Management services.                                                                                                                            |

Installation & Maintenance Our Installation & Maintenance segment fabricates and installs HVAC systems, process piping and other MEP systems in new and existing industrial, commercial and institutional buildings and provides ongoing preventative and corrective maintenance services for those systems. Our Installation & Maintenance segment has two principal service offerings:

| • |     | Installation & Fabrication. We provide HVAC, electrical, plumbing,                                                                                                                                                                             
 process and control system installations, refurbishments and renovations in technically demanding new and existing buildings. We perform both “design-build” and “plan and specification” (“P&S”) projects. Under                              
 design-build projects, we provide the design for the project and install it. Under P&S projects, our client is responsible for designing the project and we install it to their specifications. For certain jobs, we also fabricate customized 
 components that are not readily available for purchase from other third-party vendors or provide modular construction services based on a client’s specifications. We generated approximately 79% of our 2024 Installation & Maintenance       
 segment revenues from Installation & Fabrication services.                                                                                                                                                                                     |

| • |     | Maintenance & Service. We provide preventative                                                                                                                                                                                                            
 maintenance, emergency repair and break-fix services over the life of a building’s mechanical systems. Our services include regular inspections and maintenance to prevent downtime; responding to calls                                                  
 and sending technicians onsite to repair a system failure or malfunction; and other complementary services such as facility energy analysis, automation and optimization, system certification and testing. We typically provide preventative maintenance 
 services under annual or longer-term agreements that range from one to five years. We generated approximately 21% of our 2024 Installation & Maintenance segment revenues from Maintenance & Service work.                                                |

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Sales & Marketing

We go to market as “Legence” or one of our other registered or unregistered brands as “a Legence Company” depending on
the scope of services and the strength of the particular brand in the market. Our principal Engineering & Consulting brands include CMTA, P2S, Shadpour Consulting Engineers, RE Tech Advisors and Black Bear. Our principal
Installation & Maintenance brands include Therma, A.O. Reed, Bel-Aire Mechanical, VarcoMac, Gilbert Mechanical Contractors and Yearout.

We utilize a “seller-doer” approach to client sales and project origination. Under this model, all client-facing employees have
the ability and are encouraged to originate new sales opportunities. Our engineers, consultants, project managers and technicians take the lead in identifying and