Janitorial Services (United States) — NAICS 56172

Short primer — single-child pass-through. In the North American Industry Classification System (NAICS), the five-digit industry 56172, Janitorial Services, contains exactly one six-digit national industry: 561720, Janitorial Services. The two are effectively identical — the same firms, receipts, employment, and concentration figures roll up unchanged. This page gives the level's own ground-truth statistics and orients you; for the full economics, investable universe, regulation, and how-to-invest detail, see the 561720 primer, which this page summarizes rather than repeats.

1. Overview

Janitorial services is the business of cleaning building interiors under contract — offices, hospitals, schools, warehouses, airports, and stores — mostly at night, mostly by hand, mostly for a recurring monthly fee. It is one of the largest, most fragmented, and least glamorous industries in the U.S. economy: roughly 64,000 employer firms took in about $72.6 billion in receipts in 2022, and the industry directly employed close to 1.1 million workers.[1][2]

For an investor, the appeal is defensive: demand is highly recurring and largely non-discretionary — occupied buildings have to be cleaned every day. But the economics are thin. This is a labor-arbitrage business where wages are the bulk of a contract's cost, net margins are low-single-digit, worker turnover is high, and clients treat cleaning as a cost center and push hard on price.[3] Money is made by managing labor tightly, keeping contracts renewed, passing wage increases through fast, and — for the larger players — rolling up small operators and cross-selling other building services.

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

NAICS is a nested hierarchy: sector (2-digit) → subsector (3-digit) → industry group (4-digit) → NAICS industry (5-digit) → national industry (6-digit). Sometimes a 5-digit industry splits into several 6-digit children; here it does not. 56172 has a single child, 561720, so the 5-digit "NAICS industry" and the 6-digit "national industry" describe the same set of establishments. There is no aggregation across siblings to do and no residual "all other" bucket — the rollup is a straight pass-through.

Scope (unchanged from the child). The code covers establishments primarily engaged in cleaning building interiors, the interiors of transportation equipment (aircraft, rail cars, ships), and windows — custodial and office cleaning, housekeeping and maid service, washroom sanitation, disinfecting, and aircraft-cabin cleaning.[5] It excludes exterior building cleaning and pressure washing (NAICS 561790), carpet and upholstery cleaning (561740), pest control (561710), landscaping (561730), hazmat and remediation (562910), and bundled "run-the-whole-building" integrated facilities management (561210). The 561720 primer covers these boundaries and the resulting comparability problems in full.

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

Federal employer statistics for NAICS 56172 — identical to 561720 because they are the same industry. These combine 2023 County Business Patterns (CBP) with 2022 Economic Census figures; read the two vintages as complementary, not as a single-year financial statement.

Simple ratios imply roughly 1.1 establishments per firm and about 16 employees per establishment — averages, not medians. The HHI (a standard market-concentration measure) is suppressed in the federal release and should not be inferred.

The undercount is large and matters here. These figures count only firms whose primary business is contract cleaning, and CBP covers only businesses with paid employees. Two big populations are missed:

• In-house custodians. Schools, hospitals, governments, and building owners that employ their own cleaners are classified to their industry, not to 56172. The Bureau of Labor Statistics (BLS) counts about 2.24 million "janitors and building cleaners" across the whole occupation (May 2024) — roughly double the ~1.1 million on 56172 firms' payrolls.[4] The gap is the in-sourced workforce, and it is also the industry's growth pool.
• Nonemployer and informal operators. The employer census excludes the large tail of sole proprietors and cash-paid independent house cleaners with no payroll. Actual firm and worker counts run well above the tallies above.[6]

Market-research firms put the broader U.S. janitorial market a bit higher — around $77–82 billion in 2024–2025 — reflecting later years and the very small and residential operators the employer census counts incompletely, with growth clustering near 3% annually.[7][9]

4. Investable universe (where value concentrates)

Because 56172 is a single-child industry, all of its investable value sits in the same names as the 561720 primer — there is no separate sibling industry to diversify across. There is no U.S.-listed pure-play janitorial leader and no dedicated janitorial exchange-traded fund (ETF).

• ABM Industries (ABM, NYSE) — the closest large-cap proxy and the largest U.S. commercial janitorial contractor; cleaning anchors its Business & Industry, Manufacturing & Distribution, Aviation, and Education segments.[10]
• Healthcare Services Group (HCSG, Nasdaq) — a focused pure play in institutional (nursing-home and hospital) housekeeping and laundry.[13]
• GDI, Aramark (ARMK), ISS, Sodexo (SW), Compass (CPG) — cleaning exposure blended with food service or broader facilities management, and in several cases foreign-listed.[12][14][15][16][17]

The largest cleaning organizations outside public markets are franchise systems (ServiceMaster, Jani-King, Jan-Pro, Coverall) and private-equity platforms (for example, the KKR/Ares/BlackRock-backed Kellermeyer Building Services), sitting atop the ~64,000 independent employer firms.[19][17] The 561720 primer names the full roster.

5. How the money works

Revenue is recurring contract work, typically priced per square foot per month and billed monthly, but cancelable on short notice (often 30–90 days) with low switching costs and constant price competition.[10] Labor dominates cost — commonly 50–70% of a contract — so the business is capital-light but thin-margined; the industry leader, ABM, earned roughly a 1% net margin in fiscal 2024.[3][10] The levers owners actually watch are revenue per labor hour, wage pass-through speed, contract retention, route (account) density, and working capital, because crews are paid weekly while clients pay net-30/60. A distinct franchise variant — where a franchisor signs and "guarantees" accounts, takes royalties and fees off the top, and the local franchisee supplies the labor — is capital-light for the franchisor but is the source of the industry's biggest legal exposure. See the 561720 primer for the full mechanics.

6. Demand drivers

• Occupied commercial square footage across offices, healthcare, education, retail, industrial/warehouse, and aviation — with post-2020 hybrid work and office vacancy a persistent drag on the office slice specifically.[10]
• Outsourcing penetration — the structural tailwind: because roughly half of all janitorial labor is still in-house, the runway to convert in-sourced work to contracts is long.[4]
• Health and hygiene expectations raised by COVID-19 and only partly reverted, plus growth property types (e-commerce warehouses, data centers, life-sciences space).[12]
• Defensive but partly cyclical: healthcare, education, and government keep cleaning through downturns, while offices, retail, and hospitality cut frequency and squeeze price.

7. Regulation

Lightly licensed but heavily exposed to labor, safety, and immigration rules — none of it specific to the 5-digit level. The federal Fair Labor Standards Act (FLSA) and a thicket of higher state/local minimum wages set the wage floor; the McNamara-O'Hara Service Contract Act (SCA) governs federal-contract prevailing wages; the Occupational Safety and Health Administration (OSHA) sets chemical, PPE, and bloodborne-pathogen standards; and I-9 / E-Verify immigration enforcement is a live supply risk given a disproportionately immigrant workforce.[4][19] Worker-classification law (California's ABC test) strikes directly at the franchise model. Investors should treat wage-and-hour compliance, worker classification, and insurance claims as diligence items; the 561720 primer details each.

8. Consolidation

This is one of the least concentrated large service industries in the country: the top four firms hold only about 15% of revenue, the top fifty about 32% — the rest split among tens of thousands of small operators.[2] Near-zero capital requirements and a "mop-and-a-client" entry barrier keep new local firms forming and price competition relentless. Consolidation is therefore a strategy, not a market condition: national players and private-equity platforms roll up small regional cleaners for route density, bundle janitorial into integrated facilities management, and use franchising to aggregate tiny operators under one brand. The binding constraint on scale is labor management, not capital.[10]

9. Risks

• Labor cost and availability — wage inflation plus chronic turnover; if contract re-pricing lags, margin erodes fast.[3]
• Immigration enforcement — I-9 audits, E-Verify mandates, and raids are a supply shock, not just a compliance cost.
• Razor-thin margins — ~1% net at the leader means small missteps swing profitability.[10]
• Contract churn — low switching costs and short cancellation windows; losing one large account can hurt a regional operator.[10]
• Misclassification and wage-hour litigation — the franchise model's central legal risk (the Jan-Pro line of cases; a reported ~$30 million settlement).[20]
• Measurement risk — federal stats omit nonemployer and in-house activity, and public-company reporting blends janitorial with broader services, so both the industry and the individual names are hard to size cleanly.

10. How to invest, and outlook

For public-market investors, the menu is thin: own ABM for the most direct large-cap exposure, HCSG for focused institutional housekeeping, or the diversified facilities/food names (GDI, ARMK, ISS, SW, CPG) for the theme with more dilution. Because margins are thin, these trade on earnings before interest, taxes, depreciation, and amortization (EBITDA) — measures such as enterprise value to EBITDA (EV/EBITDA) and free-cash-flow yield — and on the durability of the contract book rather than on growth multiples. There is no pure janitorial ETF. For private investors, the extreme fragmentation is the opportunity: buying or building a local operator (often Small Business Administration–financeable at low single-digit cash-flow multiples), owning a cleaning franchise (study the master-franchise economics and misclassification history carefully), or backing a facilities-services roll-up.

Outlook. A low-growth (roughly 3% annual, largely labor-led), defensive, cash-generative industry where returns come from execution and consolidation, not a rising tide. The durable tailwind is outsourcing; the durable headwinds are labor — wage inflation, turnover, and immigration-enforcement risk — plus office real-estate softness. Because 56172 is identical to 561720, the full analysis — company-by-company investable universe, contract economics, regulation, franchise litigation, and diligence checklists — lives in the 561720 primer.

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Sources

1. U.S. Census Bureau. "County Business Patterns (NAICS 561720), 2023" — employment, establishments, annual and first-quarter payroll. https://www.census.gov/programs-surveys/cbp.html
2. U.S. Census Bureau. "2022 Economic Census — Janitorial Services (NAICS 561720): receipts, firms, and concentration ratios (CR4/CR8/CR20/CR50; HHI suppressed)," 2022. https://www.census.gov/programs-surveys/economic-census.html
3. ResearchAndMarkets / GlobeNewswire. "United States Janitorial Services Market Forecast and Growth Trends Report 2025–2033 — Outsourcing Surge; Labor Shortages," 2025. https://www.globenewswire.com/news-release/2025/07/29/3123150/28124/en/
4. U.S. Bureau of Labor Statistics. "Occupational Outlook Handbook / OEWS: Janitors and Building Cleaners, May 2024" — ~2.24M occupation employment, $17.27 median hourly wage, ~2% 2024–2034 growth. https://www.bls.gov/ooh/building-and-grounds-cleaning/janitors-and-building-cleaners.htm
5. U.S. Census Bureau / NAICS. "561720 — Janitorial Services: 2022 definition, examples, and exclusions." https://www.census.gov/naics/?details=561720&input=561720&year=2022
6. U.S. Census Bureau. "County Business Patterns — Methodology (coverage and exclusions: nonemployers, self-employed, private-household and most government employees)." https://www.census.gov/programs-surveys/cbp/technical-documentation/methodology.html
7. Grand View Research. "U.S. Janitorial Services Market Size & Outlook (~$81.9B in 2025; ~3.3% CAGR)," 2025. https://www.grandviewresearch.com/industry-analysis/us-janitorial-services-market-report
8. ResearchAndMarkets. "United States Janitorial Service Market Size and Forecast 2025–2033 ($76.68B in 2024 → $100.22B by 2033)," 2025. https://www.researchandmarkets.com/reports/6101837/
9. ABM Industries Inc. "Form 10-K, fiscal year ended Oct 31, 2024" — ~$8.36B revenue, $81.4M net income, ~68% direct-labor share, cancelable-contract and office-occupancy risk language. https://www.sec.gov/Archives/edgar/data/771497/000077149724000029/abm-20241031.htm
10. Aramark. "2024 Annual Report / Form 10-K (total revenue ~$17.4B) — facilities/custodial across business, education, healthcare, industrial, and aviation," 2024. https://www.aramark.com/
11. Healthcare Services Group, Inc. "Form 10-K, FY2024 — revenue ~$1.72B; housekeeping & laundry ~$765.4M; ~2,600 facilities," 2024. https://www.sec.gov/Archives/edgar/data/731012/000073101225000032/hcsg-20241231.htm
12. ISS A/S. "Annual Report 2024 — revenue ~DKK 83.8B; cleaning ~42% of revenue," 2024. https://www.issworld.com/
13. GDI Integrated Facility Services Inc. "Company and investor information (TSX: GDI); North American commercial cleaning and IFM," 2026. https://gdi.com/
14. Sodexo. "Share profile and facilities-management services (Euronext Paris: SW)," 2026. https://www.sodexo.com/investors/sodexo-share/share-profile
15. Compass Group plc. "Services and shareholder centre (LSE: CPG)," 2026. https://www.compass-group.com/en/what-we-do/services.html
16. ServiceMaster Brands / Businesswire. "Roark Capital Acquires ServiceMaster Brands Franchise Business for $1.553 Billion," 2020. https://www.businesswire.com/news/home/20200902005326/en/
17. Kellermeyer Building Services (KBS). "2024 recapitalization — KKR, Ares Management, and BlackRock as majority equity holders," 2024. https://www.kbs-services.com/about/
18. Service Employees International Union (SEIU). "Justice for Janitors (~225,000 organized janitors; immigrant workforce; 2025 developments)," 2025. https://www.seiu.org/justice-for-janitors
19. U.S. Occupational Safety and Health Administration (OSHA). "Cleaning-industry hazards; Hazard Communication; Personal Protective Equipment; Bloodborne Pathogens standard (29 CFR 1910.1030)." https://www.osha.gov/bloodborne-pathogens
20. Buchalter. "Roman v. Jan-Pro Franchising International, Inc.: Court Clarifies Employee Misclassification and ABC Test Application," 2022. https://www.buchalter.com/insights/roman-v-jan-pro-franchising-international-inc-court-clarifies-employee-misclassification-and-abc-test-application/