Building Equipment Contractors (NAICS 2382): An Investor's Primer

A Histometrics rollup primer for public-market and private investors

This is a rollup page. In the North American Industry Classification System (NAICS, the standard the U.S. and Canadian governments use to group businesses), the four-digit industry group 2382 — Building Equipment Contractors aggregates the specialty-trade firms that install and service the working systems inside a building: its power and wiring, its plumbing and climate systems, and its elevators, doors, and other mechanical equipment. It contains three five-digit industries. This page's value is the contrast across those three — how they differ in size, direction, ownership, and how you invest in them — followed by the level as a whole. For the company-by-company detail, read each child primer: 23821 Electrical, 23822 Plumbing/HVAC, and 23829 Other.

1. Overview

Building Equipment Contractors are the "inside" specialty trades: once a structure's shell exists, these are the firms that make it work — running the wiring, plumbing, heating, cooling, ventilation, elevators, and other mechanical systems, then servicing and replacing them for decades afterward [1]. Together they are one of the largest slices of the U.S. construction economy: roughly $589 billion of annual receipts, 2.4 million workers, and nearly 200,000 employer firms [2][3].

Three things unite the group and make it interesting to investors. First, it is labor — the value is skilled tradespeople putting equipment in place, and a persistent shortage of licensed electricians, plumbers, HVAC (heating, ventilation, and air-conditioning) mechanics, and elevator technicians is the binding constraint across all three trades [5][6][7]. Second, it is local and fragmented — licensing is state-and-local, competition is job-by-job, and no firm has national pricing power (more on this striking number in Section 3). Third, it sits directly in the path of the decade's biggest capital-spending waves: the data-center / artificial-intelligence (AI) buildout, electrification, factory reshoring, and a regulator-forced refrigerant turnover — none of which get built without these trades [8][12].

Where the three children diverge is what the rest of this page is about.

2. What's inside — the three children and how they differ

NAICS nests: the four-digit industry group 2382 splits into three five-digit industries, each of which happens to contain a single six-digit child of the same name (so 23821 = 238210, 23822 = 238220, 23829 = 238290). The three are all specialty-trade contractors, but they differ sharply in scale, ownership, and how an investor gets exposure.

Acronyms: CR4 = combined revenue share of the four largest firms; HHI = Herfindahl-Hirschman Index, a 0–10,000 concentration score where anything under 1,500 is "unconcentrated"; ETF = exchange-traded fund; ESOP = employee stock ownership plan; PE = private equity.

The three most investment-relevant contrasts:

1. Size and growth. Plumbing/HVAC is the biggest child by revenue, employment, and firm count, and its demand is the most defensive — more than 90% of U.S. homes already have air-conditioning and equipment wears out on a 10-to-20-year cycle, so much of the work is non-discretionary repair and replacement [primer 23822]. Electrical is close behind on size but has the strongest structural growth story — rising electricity demand for the first time in a generation, led by data centers [8]. "Other" is a rounding error by comparison — but hides the highest-quality business model in the group (see below).

2. Concentration — and the illusion inside it. Electrical and Plumbing/HVAC are two of the most fragmented industries in the entire U.S. economy (four-firm shares under 5%). "Other" looks far more concentrated (CR4 of 27.7%), and even that understates reality: its headline blends a genuine elevator/escalator oligopoly — a handful of global makers — with a fragmented long tail of door, conveyor, and millwright shops [primer 23829]. So the same four-digit group contains both the most competitive and the most concentrated markets in specialty-trade construction.

3. How you actually get exposure. This is the sharpest practical difference. In Electrical and Plumbing/HVAC there is no clean public pure-play — the listed names are diversified contractors, or they sit one step up the chain as distributors and equipment makers, and most of the real ownership is private and PE-backed. "Other" is the exception: because elevators are an oligopoly, it offers the group's cleanest listed exposure (Otis), though mostly through foreign-listed makers. Tickers and multiples are held to Sections 4 and 10.

3. How big it is (this level's rollup figures)

Ground-truth U.S. federal statistics for NAICS 2382, from the Histometrics dataset (dollar figures converted from thousands). Reassuringly, the three children's establishment, employment, and payroll counts sum exactly to these level totals, and their receipts sum to ~$589B — so this is a clean rollup, not an estimate [2][3].

Concentration — almost none, and lower than any single child. At the group level the four largest firms hold just 3.8% of receipts (CR4); the top 8 hold 5.9%, the top 20 hold 9.5%, and the top 50 combined hold only 13.8% [3]. The HHI is 7 — one of the lowest concentration readings anywhere in the U.S. economy [3]. Note the paradox: the group's CR4 (3.8%) is lower than every child's CR4 (4.8%, 4.7%, 27.7%). That is because the biggest firms in each trade do not overlap — a giant electrical contractor is a nobody in plumbing or elevators — so against the combined $589 billion base each looks even smaller. The aggregation dilutes concentration, and in doing so it hides the elevator oligopoly buried inside the "Other" child. Read the group HHI as confirmation that competition is fought locally and trade-by-trade, not as evidence that the whole field is uniformly open.

Undercount caveat. These are employer statistics — firms with payroll. All three trades, and especially electrical and plumbing, have a very large tail of self-employed, owner-operator tradespeople and no-payroll micro-outfits that the Census Bureau counts separately as "nonemployer" businesses; our ground-truth file does not include that count, so we put no number on it [2][4]. The practical effect: the true number of operating building-equipment businesses is meaningfully higher than the ~197,500 employer firms shown, though those micro-operators add relatively little to the revenue and payroll totals. Because the group's four-firm concentration is so low, the field is dominated by small and individual ownership — which reinforces the same caveat. (The "Other" child's nonemployer tail is proportionally smaller but still real — sole-proprietor millwrights and riggers [primer 23829].)

4. Investable universe — where value concentrates across the children

Value in this group is spread across all three trades, but how it is packaged for an investor differs by child. Tickers below are for orientation, not recommendations.

• Electrical (~42% of the group). Few pure listed plays; the cleaner proxies are IES Holdings (NASDAQ: IESC) and MYR Group (NASDAQ: MYRG), with EMCOR Group's (NYSE: EME) electrical segment and the electrical arm of Comfort Systems USA (NYSE: FIX) also relevant; Quanta (NYSE: PWR), MasTec (NYSE: MTZ), and Dycom (NYSE: DY) carry heavy utility-line overlap. The largest owners are private — employee-owned and PE-backed platforms such as Rosendin, Faith Technologies, and ArchKey [primer 23821].
• Plumbing/HVAC (~50% of the group). Listed contractors closest to the work are Comfort Systems USA (NYSE: FIX) and Limbach (NASDAQ: LMB) for commercial mechanical, and Chemed (NYSE: CHE) for residential plumbing via Roto-Rooter; EMCOR (NYSE: EME) and IES (NASDAQ: IESC) blend the trades. The distinctive extra route here is "picks-and-shovels" one step up the chain — distributors Ferguson (NYSE: FERG) and Watsco (NYSE: WSO) and equipment makers Carrier (NYSE: CARR), Trane (NYSE: TT), Lennox (NYSE: LII), and A. O. Smith (NYSE: AOS) — plus large private home-services roll-ups (Apex Service Partners, Wrench Group, Service Logic, Sila) [primer 23822].
• Other (~7% of the group). This smallest child offers the group's cleanest public exposure: Otis Worldwide (NYSE: OTIS) is the liquid U.S. pure-play on the elevator service annuity, with KONE (Helsinki), Schindler (Swiss), and TK Elevator (private) the other majors; ASSA ABLOY, dormakaba, and Allegion (NYSE: ALLE) cover automatic doors; EMCOR (EME) and APi Group (NYSE: APG) capture the work as one line among many [primer 23829].

There is no pure Building-Equipment-Contractor ETF; the Global X U.S. Infrastructure Development ETF (ticker PAVE) holds several of the electrical and mechanical names together. The through-line: across all three children, the biggest pool of ownership is private, and the listed vehicles are either diversified contractors or supply-chain adjacents — with elevators the one place a near-pure listed contractor-cum-service business exists.

5. How the money works

At bottom every firm in this group earns the spread between what it bills and what it costs to put labor and equipment in place; the game is estimating accuracy, labor productivity, and mix. Two revenue engines recur across all three trades, with very different economics — a pattern worth internalizing because it drives valuation everywhere in the group:

• Project / new-installation work is competitively bid, often fixed-price, more cyclical, and thinner-margin; backlog (signed work not yet built) is the leading indicator. Comfort Systems entered 2026 with a record backlog near $11.9 billion [10]. A fixed-price bid struck at a healthy margin can close well below it if labor, materials, or scope move against the contractor — "margin fade."
• Recurring service, maintenance, and replacement is the steadier, higher-margin engine, and it is the highest-quality slice in each child: emergency electrical service, HVAC repair-and-replace and maintenance memberships (Roto-Rooter runs mid-20% adjusted-EBITDA margins) [11], and — the purest case — the elevator "razor-and-blades flywheel," where a machine is sold once at low margin and then serviced under sticky, high-margin contracts for 20–30 years. At the industry leader, service is roughly 60% of sales but more than 90% of operating profit [9]. (EBITDA = earnings before interest, taxes, depreciation, and amortization.)

The more a business leans toward that recurring, service-annuity end, the more defensive and highly valued it is — which is why the elevator model inside the "Other" child punches so far above its 7% revenue share. Labor is the largest cost and the binding constraint in all three; licensing turns that scarcity into a moat.

6. Demand drivers

The three children share a common core and then diverge:

• Shared, and the standout near-term driver: data centers / AI. From early 2024 through late 2025, data centers accounted for over 70% of the increase in private nonresidential construction spending, and U.S. data-center power demand is forecast to climb from ~24 gigawatts toward ~110 GW by 2030 [8]. Every one needs electrical power distribution, mechanical cooling, and (in multistory facilities) elevators and conveyors — so all three trades benefit, electrical and mechanical most directly.
• Electrical-led: grid modernization and load growth, reshored semiconductor/battery manufacturing, and electrification (EV charging, heat pumps, solar, storage) [8][primer 23821].
• Mechanical-led: replacement of an aging, 90%-plus-saturated installed base on a 10-to-20-year cycle, seasonal/emergency repair, and the refrigerant transition forcing equipment turnover [12][primer 23822].
• Elevator/"Other"-led: the aging installed base driving modernization (a counter-cyclical ballast when new construction is soft), accessibility retrofits under the Americans with Disabilities Act (ADA, 1990), and roughly triennial elevator-safety-code cycles [primer 23829].
• Common cyclical layer: new construction and renovation across all three is interest-rate-sensitive; the architects' consensus panel projects only about 1% growth in nonresidential building spending in 2026 [22], so the near-term strength is concentrated in data centers, replacement, and service rather than broad new-build.

7. Regulation

Regulation across the group is mostly state-and-local licensing plus trade-specific federal codes, and it is a major reason the field stays fragmented — each trade is gated by its own credential and inspection regime, which is also a competitive moat:

• Electrical: licensed electricians (apprentice → journeyman → master); work must meet the National Electrical Code (NEC), published as NFPA 70 by the National Fire Protection Association, and pass municipal inspection [14].
• Plumbing/HVAC: state/local plumbing and mechanical licensing, plus EPA (Environmental Protection Agency) Section 608 certification to handle refrigerants; the live event is the AIM Act (American Innovation and Manufacturing Act) refrigerant transition — a 700 global-warming-potential (GWP) limit on new equipment from January 1, 2025, ending the long-standard R-410A refrigerant [12][13].
• Elevators/"Other": the dominant safety standard is ASME A17.1 / CSA B44 (American Society of Mechanical Engineers / Canadian Standards Association), updated about every three years and adopted state-by-state, with mandatory periodic inspection [15].
• Cross-cutting: the Occupational Safety and Health Administration (OSHA) governs jobsite safety under 29 CFR Part 1926 (Code of Federal Regulations), and federal public-works rules — Davis-Bacon prevailing wages and surety bonding — apply to covered contracts [16][17]. Union versus merit-shop status shapes labor cost in every trade.

8. Consolidation

Consolidation is the defining capital-markets story across all three children, but at different stages and by different buyers:

• Electrical and Plumbing/HVAC are textbook fragmented, local, relationship-driven trades (group CR4 of 3.8%) [3] — precisely why private-equity roll-ups thrive: buy a regional "platform" operator, bolt on smaller local shops, spread overhead, and sell the larger entity at a higher multiple. In electrical, PE now drives roughly 75% of M&A, with deals typically around 6–8× EBITDA [18][19]. In HVAC, PE's share of deals rose from about 8% in 2023 to 23% in 2024, and by some counts more than 60% of the top 50 HVAC firms are now PE-backed [20]. Residential is mid-consolidation; commercial is earlier.
• "Other" is a different animal — already partly consolidated at the top (the elevator oligopoly) and rolling up the fragmented service tail beneath it. The headline event is a mega-merger: in April 2026 KONE agreed to buy TK Elevator for about $34.4 billion, which would create the world's largest elevator maker, subject to regulatory approvals and possible divestitures and not expected to close before 2027 [21][primer 23829].

Across the group, consolidation should continue, but the field is unlikely to become uniformly concentrated — the trades are too diverse and local execution matters too much.

9. Risks

Most risks are shared across the three children, differing in emphasis:

• Labor scarcity (the binding constraint everywhere). A persistent shortage of licensed tradespeople caps how much work any firm or roll-up can take on and pushes up wages [5][6][7].
• Cyclicality and interest rates on the new-construction layer of all three trades [22].
• Fixed-price execution — cost overruns, change orders, retainage, and warranty on project work [primer 23821][primer 23829].
• Input-cost and supply-chain volatility — copper, steel, switchgear, transformers, refrigerant, and tariffs [12][primer 23822].
• Consolidation risk — integration failures and overpaying at today's multiples [18][20].
• Customer/project concentration for firms leaning hard into hyperscale data centers, and demand-overbuild risk if the data-center/AI capital cycle cools faster than expected [8].
• Trade-specific: loss of the residential heat-pump tax credit (HVAC) [primer 23822]; elevator service-base erosion and KONE–TKE merger/integration risk (Other) [primer 23829].
• Data limits: federal figures exclude nonemployers and government operations, so reported activity is understated [2][4].

10. How to invest, and the outlook

Match the vehicle to the child.

• Public-market routes differ by trade. For electrical and plumbing/HVAC, treat the listed names as different exposure profiles, not interchangeable peers — examine each company's segment mix, backlog quality, fixed-price exposure, cash conversion, and data-center concentration before applying price-to-earnings or enterprise-value-to-EBITDA multiples; a broad infrastructure ETF (PAVE) offers diversified, lower-single-name-risk access, and HVAC uniquely lets you play the theme via distributors and equipment makers. For "Other," the elevator specialists (led by Otis) give the cleanest listed exposure to a recurring-service annuity — which can deserve a premium, but a good business can still be a poor investment at an excessive price.
• Private-market routes are the more natural fit for most of this group, because two of the three children have almost no clean public plays and the deepest ownership pool is private: own or operate a local contractor, buy one from a retiring owner, back a PE roll-up, provide private credit against backlog and receivables, or finance an ESOP transition. In every case, underwrite the individual local market and the recurring-service share, not national growth assumptions.

Outlook. The demand backdrop is the strongest in a generation and pulls all three trades the same way — data centers, electrification, reshoring, grid investment, an aging installed base, and regulator-forced turnover are structural, multi-year tailwinds rather than one-cycle spikes [8][12]. The common constraints are skilled-labor supply and interest-rate-sensitive new construction; the common risk is a faster-than-expected cooling of the data-center/AI capital cycle. Expect a two-speed pattern within each child — service, replacement, and modernization staying resilient while new-build softens into 2026 [22] — and consolidation as the defining capital-markets theme throughout. For patient investors, the most durable value across this group may lie less in the handful of already richly valued public names and more in the fragmented private middle market — recurring service, disciplined estimating, and roll-up economics compounding quietly. For the full detail behind every point, read the three child primers: 23821 Electrical, 23822 Plumbing/HVAC, and 23829 Other.

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Sources

This is a rollup page; sources are drawn from the three child primers (NAICS 23821, 23822, 23829). Level figures in Section 3 come from the Histometrics ground-truth stats file for NAICS 2382.

1. U.S. Census Bureau, 2022 NAICS — Building Equipment Contractors (2382 / 238210 / 238220 / 238290): definitions and scope. https://www.census.gov/naics/?input=2382&year=2022
2. U.S. Census Bureau, County Business Patterns (CBP), 2023 — NAICS 2382 and children: establishments, employment, and payroll (via Histometrics ground-truth dataset). https://www.census.gov/programs-surveys/cbp.html
3. U.S. Census Bureau, 2022 Economic Census — Concentration of Largest Firms (EC2200SIZECONCEN), NAICS 2382 and children (receipts, firm count, CR4/CR8/CR20/CR50, HHI). https://data.census.gov/table/ECNSIZE2022.EC2200SIZECONCEN
4. U.S. Census Bureau, Nonemployer Statistics methodology and Economic Census scope (nonemployer and government establishments excluded). https://www.census.gov/econ/overview/mu0500.html
5. U.S. Bureau of Labor Statistics, Occupational Outlook Handbook: Electricians, 2025. https://www.bls.gov/ooh/construction-and-extraction/electricians.htm
6. U.S. Bureau of Labor Statistics, Occupational Outlook Handbook: HVAC Mechanics and Installers; Plumbers, Pipefitters, and Steamfitters, 2025. https://www.bls.gov/ooh/installation-maintenance-and-repair/heating-air-conditioning-and-refrigeration-mechanics-and-installers.htm
7. U.S. Bureau of Labor Statistics, Occupational Outlook Handbook: Elevator and Escalator Installers and Repairers (May 2024 wages). https://www.bls.gov/ooh/construction-and-extraction/elevator-installers-and-repairers.htm
8. Grid Strategies LLC, National Load Growth Report 2025 (data-center-led power demand; ~24 GW→110 GW; >70% of the rise in private nonresidential construction spending). https://gridstrategiesllc.com/wp-content/uploads/Grid-Strategies-National-Load-Growth-Report-2025.pdf
9. Otis Worldwide Corporation, Fourth Quarter and Full Year 2024 Results / 2025 Annual Report (service ~60% of sales, >90% of operating profit). https://www.otis.com/documents/d/otis-2/otis-annual-report
10. Comfort Systems USA, Fourth-Quarter 2025 Results (Form 8-K): backlog ~$11.9B, 2026. https://www.sec.gov/Archives/edgar/data/1035983/000110465925101818/fix-20251023xex99d1.htm
11. Chemed Corporation, Fourth-Quarter 2025 Results — Roto-Rooter segment, 2026. https://www.chemed.com/news-releases/news-release-details/chemed-reports-fourth-quarter-2025-results
12. U.S. Environmental Protection Agency, Technology Transitions — HFC Restrictions by Sector (AIM Act; 700 GWP limit from Jan 1, 2025), 2026. https://www.epa.gov/hfcs/technology-transitions-hfc-restrictions-sector
13. U.S. Environmental Protection Agency, Section 608 Technician Certification Requirements, 2026. https://www.epa.gov/section608/section-608-technician-certification-requirements
14. National Fire Protection Association, NFPA 70: National Electrical Code (NEC). https://www.nfpa.org/codes-and-standards/all-codes-and-standards/list-of-codes-and-standards/detail?code=70
15. American Society of Mechanical Engineers (ASME), A17.1/CSA B44 — Safety Code for Elevators and Escalators. https://www.asme.org/codes-standards/find-codes-standards/safety-code-for-elevators-and-escalators
16. Occupational Safety and Health Administration, Safety and Health Regulations for Construction, 29 CFR Part 1926. https://www.osha.gov/laws-regs/regulations/standardnumber/1926
17. U.S. Department of Labor, Fact Sheet #66: The Davis-Bacon and Related Acts. https://www.dol.gov/agencies/whd/fact-sheets/66-dbra
18. Cascade Partners, Electrical Contracting and Utility Infrastructure M&A Update (H2 2025), 2026. https://cascade-partners.com/wp-content/uploads/2026/02/Electrical-Contracting-and-Utility-Infrastructure-MA-Update-H2-2025-vF.pdf
19. BMI Mergers & Acquisitions, Electrifying M&A Market for Electrical Contractors: 2024 Recap (~6–8× EBITDA multiples), 2025. https://www.bmimergers.com/2025/02/19/electrical-contractors-2024-recap/
20. Capstone Partners, HVAC Services M&A Update, July 2025; and PKF O'Connor Davies, US HVAC M&A Industry Update — Summer 2025 (PE share ~8%→23%). https://www.capstonepartners.com/insights/article-hvac-services-ma-update/
21. CNBC, Finland's Kone to buy German rival TK Elevator in $34.4 billion deal, 2026. https://www.cnbc.com/2026/04/29/kone-tk-elevator-deal-europe-business.html
22. American Institute of Architects, Consensus Construction Forecast — January 2026 (~1% nonresidential building-spending growth in 2026). https://www.aia.org/resource-center/consensus-construction-forecast/january-2026