Other Building Equipment Contractors (NAICS 23829): An Investor's Primer

This is a rollup page. NAICS 23829 is a single-child industry — it contains exactly one national industry, 238290, and is effectively identical to it. This page gives the level's own ground-truth federal figures and orients you; for the full analysis (company-by-company investable universe, service-annuity economics, regulation, and outlook) read the 238290 primer.

NAICS stands for the North American Industry Classification System, the standard the U.S. and Canadian governments use to group businesses. The system is hierarchical, and codes get more specific as digits are added.

1. Overview

This is the specialty-trade construction industry that installs, services, repairs, and modernizes the mechanical building systems that are not electrical, plumbing, heating, cooling, or ventilation [1][6]. Its signature product is the elevator, but the same code also covers escalators and moving walkways, automatic and revolving doors, conveyor systems, millwright and machine-rigging work, vault and safe installation, vehicle lifts, and service-station equipment [1][6].

The single most important idea for an investor: much of this work is not one-and-done construction. The best businesses — especially in elevators — sell a machine once and then service it for 20 to 30 years under recurring, high-margin maintenance contracts, turning a cyclical construction activity into a steady annuity [8]. Alongside that service-annuity core sits a large, fragmented base of project-driven trades (millwrights, riggers, door and conveyor installers) that live off competitive bids and billable labor. That "barbell" is the defining feature of the code — and, because 23829 equals 238290, of this level too.

2. What's inside — and why this level equals its one child

NAICS is a nested hierarchy. The five-digit industry 23829 sits directly above the six-digit national industry, and here it contains only one:

When a five-digit industry has a single six-digit child, the two are — by definition — the same population of businesses, revenue, and employment. The extra digit exists only to keep the numbering consistent across the classification; it adds no further breakdown. So every figure in Section 3 is simultaneously the 23829 total and the 238290 total, and everything said about the child's structure, competitors, and economics applies unchanged here.

That is why this page is short. For the detailed treatment, go to the 238290 primer.

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

Federal statistics for NAICS 23829, which for a single-child level are identical to 238290. Census dollar figures are reported in thousands and converted here. These come from our ground-truth stats file for this level [2][3].

CR4 is the "concentration ratio" — the share of industry receipts taken by the four largest firms. HHI is a standard concentration gauge (under 1,500 is considered unconcentrated). There are more establishments (8,107) than firms (6,611) because the large multinationals run many branch offices under one company.

Undercount and interpretation caveats — read before trusting the headline:

1. Nonemployer operators are missing. County Business Patterns (CBP) counts only businesses with paid employees [2]. A large tail of sole-proprietor millwrights, riggers, and equipment installers has no employees and is reported separately in the Census Nonemployer Statistics [5], so the true operator population is larger than 8,107, and small/individual ownership is meaningfully undercounted here.
2. The low national concentration is misleading. The code-wide HHI of 221.8 blends a highly concentrated elevator/escalator oligopoly with a fragmented long tail of door, conveyor, vault, and garage-equipment installers. Within elevators specifically, the market is far more concentrated than these numbers suggest [3][17].
3. Receipts capture contracting, not the whole vertical. The $42.4 billion is install-and-service value; manufacturing the equipment — much of it abroad — is booked under separate manufacturing codes [1][3].

The SBA (U.S. Small Business Administration) size standard for this industry is $22 million in average annual receipts — the line below which a firm counts as "small" for federal-contracting purposes, not a ceiling on company size [4].

4. The investable universe (where value concentrates)

Because there is only one child, value concentrates exactly as it does inside 238290. In one sentence: the public options are limited and mostly foreign-listed elevator and automatic-door makers plus a few diversified U.S. contractors, while the far larger private base is where most ownership actually sits [8][16][17].

• Elevator specialists — the cleanest exposure to the service annuity. Otis Worldwide (OTIS, NYSE) is the purest, most liquid U.S.-listed play; KONE (Helsinki) and Schindler (Swiss) are top-tier makers on foreign exchanges; Mitsubishi Electric (Tokyo) holds elevators inside a conglomerate; TK Elevator is private (private-equity-owned) [8][9][14].
• Automatic doors — ASSA ABLOY (Stockholm), dormakaba (Swiss), and Allegion (ALLE, NYSE), for each of which doors are only a slice of the business [24][25].
• Diversified U.S. specialty contractors / safety services — EMCOR (EME) and APi Group (APG) capture this work as one line among many [26][28].
• Private base — roughly 800 independent elevator-service firms plus thousands of small door, conveyor, rigging, and millwright shops; private-equity roll-up platforms such as Arcline's American Elevator Group are consolidating them [16][17].

OEM means original equipment manufacturer — the company that makes the machine. There is no U.S.-listed small-cap pure-play contractor in this code. See the 238290 primer for the full company-by-company table.

5. How the money works

Two very different models sit inside this one level [8][26][27]:

• The elevator/door "flywheel" (razor-and-blades). Installing new equipment is competitively bid and low-margin; the payoff is a decades-long, high-margin, sticky maintenance contract on each unit. At the industry leader, service is roughly 60% of sales but more than 90% of operating profit [8]. Owners watch the maintenance portfolio (units under contract) and its growth, conversion/retention/recapture rates, modernization sales, and route density.
• Project-based trades (millwrights, rigging, vaults, conveyors, garage equipment). Bid-driven, more cyclical, thinner-margin, with no service annuity. Money is made or lost on backlog, billable-labor utilization, estimating accuracy, and cost pass-through; a single estimating error or mishandled change order can erase a job's margin [26][27].

Labor is both the main cost and the moat. Elevator and escalator installers/repairers are the highest-paid U.S. construction trade (median pay $106,580 in 2024), the work is largely unionized, and it requires a multi-year apprenticeship — so skilled-labor scarcity both caps capacity and supports pricing power [10].

6. What drives demand

• New nonresidential and high-rise construction — the source of new-equipment sales; cyclical and interest-rate-sensitive, and currently soft (the American Institute of Architects' consensus panel projects only about 1% growth in nonresidential building spending in 2026) [18].
• The aging installed base → modernization — upgrading decades-old elevators is the counter-cyclical ballast to weak new construction [7][8].
• Accessibility — the Americans with Disabilities Act (ADA, 1990) and an aging population pull elevators, automatic doors, and lifts into existing buildings [12][13].
• Energy-efficiency retrofits and safety-code cycles — retrofit demand and roughly triennial elevator-code updates force upgrades [11][20].
• Public and industrial facilities — transit, airports, hospitals, distribution centers, and data-center builds add escalators, elevators, conveyors, and rigging work [10].

7. Regulation

Extensive, mostly project- and jurisdiction-specific, and functions as both a barrier to entry and a source of recurring demand [11][12]:

• Safety codes — the dominant standard is ASME A17.1 / CSA B44 (from the American Society of Mechanical Engineers and the Canadian Standards Association), updated about every three years and adopted state-by-state with local amendments; most states license elevator contractors and require periodic inspections [10][11].
• Building and accessibility codes — the International Building Code (IBC) and the 2010 ADA Standards for Accessible Design set adoption and compliance requirements [12][22].
• Worker safety and federal contracting — the Occupational Safety and Health Administration (OSHA) governs construction safety, and Davis-Bacon prevailing-wage rules apply on covered federally funded work [21][23].
• Antitrust — because equipment makers also dominate the lucrative service base, competition authorities watch service-market concentration closely (a live issue in the pending KONE–TK Elevator merger) [14][17].

8. Consolidation

Two forces are reshaping the field [16][17]:

1. A roll-up wave. Aging independent owners with no succession plan are selling; private-equity platforms (e.g., American Elevator Group) and the OEMs are buying to add route density [16][17].
2. 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; shareholders approved in mid-2026, but completion is expected no earlier than the second quarter of 2027, remains subject to regulatory approvals across jurisdictions, may require divestitures, and is opposed by Schindler [14][15].

Consolidation should continue, but the broad category is unlikely to become fully concentrated — the underlying specialties are too diverse and local execution matters. Elevator service will likely consolidate faster than the door, rigging, conveyor, and millwright niches.

9. Risks

• Construction cyclicality and interest rates — new-equipment demand tracks rate-sensitive nonresidential and high-rise construction [18].
• Labor scarcity and wage inflation — the same moat that supports pricing caps capacity and raises costs [10].
• Fixed-price execution — on project trades, a small estimating error or overrun can erase a job's margin [26][27].
• Input-cost volatility and tariffs — steel, copper, and imported motors/components can rise faster than contract prices [7].
• Service-base erosion — independents and regulators press for open access to proprietary systems; losing service units hits the highest-margin revenue [17].
• Merger and integration risk — the KONE–TKE deal could be delayed, blocked, or forced to divest [14][17].
• Diversification dilution / data limits — for the diversified names this industry is only part of a larger company, and federal statistics exclude nonemployers and government operations, so the reported figures understate true activity [5].

10. How to invest and the outlook

Public routes — decide the exposure first. Elevator specialists (led by the liquid U.S. pure play, Otis) offer the clearest exposure to the service annuity; automatic-door and diversified-contractor names give partial, blended exposure; foreign listings add currency and foreign-regulatory risk [8][9][24][26]. Compare valuation against quality — a recurring-service business can deserve a premium, but a good business can still be a poor investment at an excessive price.

Private routes — this is where most of the industry trades hands: buying or backing local elevator, door, conveyor, and millwright/rigging service firms, providing private credit, or investing in the roll-up platforms [16][17]. Underwrite the share of recurring service revenue, installed-base ownership and retention, technician productivity, backlog quality, and owner-succession dynamics.

Near-term outlook. Expect a two-speed industry: new-equipment sales face a soft patch as nonresidential construction stays weak into 2026–2027, while service, modernization, and accessibility-/code-driven upgrades keep the higher-margin revenue growing regardless of the construction cycle [8][18][19]. The signposts to watch are the KONE–TK Elevator antitrust process, the interest-rate path that governs construction starts, and the availability of skilled mechanics [10][14][18].

For the full detail behind every point above, read the 238290 primer — as a single-child level, 23829 adds no separate analysis of its own.

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Sources

1. U.S. Census Bureau. "2022 NAICS Definition — 238290 Other Building Equipment Contractors." https://www.census.gov/naics/?input=238290&year=2022
2. U.S. Census Bureau. "County Business Patterns 2023 — NAICS 238290 (Table CB2300CBP)." https://data.census.gov/table/CBP2023.CB2300CBP
3. U.S. Census Bureau. "2022 Economic Census — Concentration of Largest Firms, NAICS 238290 (Table EC2200SIZECONCEN)." https://data.census.gov/table/ECNSIZE2022.EC2200SIZECONCEN
4. U.S. Small Business Administration. "Table of Small Business Size Standards (effective 2023) — NAICS 238290." https://www.sba.gov/document/support-table-size-standards
5. U.S. Census Bureau. "Nonemployer Statistics." https://www.census.gov/econ/overview/mu0500.html
6. NAICS Association. "NAICS Code 238290 — Other Building Equipment Contractors." https://www.naics.com/naics-code-description/?code=238290
7. IBISWorld. "Elevator Installation & Service in the US — Industry Report." 2026. https://www.ibisworld.com/united-states/industry/elevator-installation-service/208/
8. Otis Worldwide Corporation (PR Newswire). "Otis Reports Fourth Quarter and Full Year 2024 Results." 2025. https://www.prnewswire.com/news-releases/otis-reports-fourth-quarter-and-full-year-2024-results-302363158.html
9. Otis Worldwide. "2025 Annual Report." https://www.otis.com/documents/d/otis-2/otis-annual-report
10. 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
11. 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
12. U.S. Department of Justice. "2010 ADA Standards for Accessible Design." https://www.ada.gov/law-and-regs/design-standards/2010-stds/
13. Buildings.com. "How Elevator Modernization Ensures Accessibility and ADA Compliance." 2024. https://www.buildings.com/safety-security/ada-compliance/article/55039419/how-elevator-modernization-ensures-accessibility-and-compliance
14. 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
15. KONE. "Extraordinary General Meeting Has Approved the Resolutions Related to the TK Elevator Transaction." 2026. https://www.kone.com/global/en/newsroom/releases/2026/kone-corporations-extraordinary-general-meeting-has-approved-the-proposed-resolutions-related-to-the-tk-elevator-transaction-2026-06-03.html
16. American Elevator Group. "Our Story." https://americanelevator.com/about/our-story
17. NextMSC / Elevator World. "How Consolidation Is Reshaping the 2026 Elevator Market." 2026. https://www.nextmsc.com/blogs/how-is-24-bn-consolidation-shift-reshaping-2026-elevator-market
18. American Institute of Architects. "Consensus Construction Forecast — January 2026." https://www.aia.org/resource-center/consensus-construction-forecast/january-2026
19. U.S. Census Bureau. "Monthly Construction Spending — May 2026." https://www.census.gov/construction/c30/current/index.html
20. U.S. Department of Energy. "Retrofit Existing Buildings." https://www.energy.gov/cmei/buildings/retrofit-existing-buildings
21. Occupational Safety and Health Administration. "Safety and Health Regulations for Construction, 29 CFR Part 1926." https://www.osha.gov/laws-regs/regulations/standardnumber/1926
22. International Code Council. "The International Building Code (IBC)." https://www.iccsafe.org/products-and-services/i-codes/ibc/
23. U.S. Department of Labor. "Fact Sheet #66: The Davis-Bacon and Related Acts." https://www.dol.gov/agencies/whd/fact-sheets/66-dbra
24. GlobeNewswire / GMInsights. "United States Automatic Door Market — vendors and size." 2024. https://www.globenewswire.com/news-release/2024/02/08/2825930/28124/en/United-States-Automatic-Door-Market-Insights-Report-2024-2029.html
25. Stanley Black & Decker. "Stanley Black & Decker Completes Sale of Access Technologies Business to Allegion." 2022. https://ir.stanleyblackanddecker.com/news-events/press-releases/news-details/2022/Stanley-Black--Decker-Completes-Sale-of-Access-Technologies-Business-to-Allegion/default.aspx
26. EMCOR Group. "Annual Report on Form 10-K." https://www.sec.gov/cgi-bin/browse-edgar?action=getcompany&CIK=0000105634&type=10-K
27. Comfort Systems USA. "Annual Report on Form 10-K." https://www.sec.gov/cgi-bin/browse-edgar?action=getcompany&CIK=0001035983&type=10-K
28. APi Group. "Annual Report on Form 10-K." https://www.sec.gov/cgi-bin/browse-edgar?action=getcompany&CIK=0001796209&type=10-K