Glass and Glazing Contractors (U.S.) — Industry-Level Primer

NAICS 2022 code 23815. NAICS (North American Industry Classification System) is the standard the U.S. government uses to group businesses by activity. This is a NAICS "industry" (the 5-digit level), one step up from the detailed 6-digit "national industry."

1. Overview

Glass and glazing contractors are the specialty-trade firms that install glass into buildings — storefronts, entrance systems, office-tower "curtain walls" (the all-glass-and-metal skins that hang off a building's structure), skylights, mirrors, shower and railing glass, and replacement glazing. "Glazing" simply means setting glass into an opening. These are subcontractors: on a typical commercial job they work under a general contractor (GC), bid a fixed price, then fabricate and hang the facade [1].

This page is deliberately short. At the 5-digit level (23815), the industry is identical to its single 6-digit child, 238150 — there is nothing at this level that the child does not already contain. For the full treatment — economics, named companies and tickers, regulation, consolidation, risks, and how to invest — read the 238150 primer. What follows is a brief orientation plus this level's own ground-truth federal figures.

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

NAICS is hierarchical: each 5-digit industry contains one or more 6-digit national industries. NAICS 23815 contains exactly one child:

When a 5-digit industry has a single child, the two are effectively the same universe of businesses — same scope, same firms, same statistics. The U.S. classification splits 238150 out only to keep a consistent six-digit level across the system; it carries no activity that 23815 lacks and vice versa. So every scope line, exclusion, and boundary in the child applies here unchanged: installing glass in prepared openings and related building-glass work, not manufacturing the glass (that is the NAICS 3272 glass-manufacturing family), not installing complete prefabricated window/door units (often NAICS 238350, Finish Carpentry Contractors), and not auto glass (NAICS 811122) [1].

3. Size (this level's federal figures)

These are our ground-truth federal statistics for NAICS 23815 — employer firms only. Because the level equals its one child, they match the 238150 figures. Years differ because County Business Patterns (CBP) is annual while the Economic Census (EC) runs every five years:

No value here is suppressed, so all are usable. The Census does not publish a per-firm profit margin for this code, and we do not invent one.

Undercount caveat — read this. The figures above count employer establishments with paid payroll. CBP excludes nonemployer businesses (sole proprietors, one-person and moonlighting glaziers, tiny residential shops), reported separately, and it excludes most government workers. Our supplied file contains no nonemployer count for this code, so we make no federal estimate. External private research that folds in nonemployers puts the full operator universe at roughly 28,000 businesses and about $25 billion in 2025–2026 [5] — meaning the ~6,900 employer establishments the Census captures are only about a quarter of all businesses operating under this code. Treat the federal numbers as the employer core of a larger, more fragmented reality, dominated by small and individual owners.

4. Investable universe (where value concentrates)

Because there is only one child, all of this level's value sits inside 238150 — there is no cross-child mix to weigh. The concentration is by firm size, not by sub-industry: engineered commercial/architectural glazing (curtain wall, storefront, high-performance facades) holds the money and complexity, while a long tail of small residential and repair shops holds the count.

For public-market investors the takeaway is unchanged from the child: there is no pure-play, U.S.-listed glazing contractor. The closest listed proxy is Apogee Enterprises (APOG, Nasdaq), whose Harmon/Architectural Services segment is a true installer bundled with glass and aluminum manufacturing; Tecnoglass (TGLS, NYSE) and Installed Building Products (IBP, NYSE) are differently-exposed comparables [6][9][11][12]. For private investors, this industry is the opportunity — thousands of owner-operated firms and active private-equity (PE) roll-up activity. The named private platforms (Harmon, Permasteelisa/Benson, Enclos, W&W Glass, and others) and the full public/private breakdown live in section 4 of the 238150 primer [6][7].

5. How the money works

Glazing is a project-based subcontracting business with specialty-trade construction economics — not manufacturing or retail. Firms win fixed-price work by bidding, recognize revenue over time as jobs progress, and run a cost stack of materials (fabricated glass and aluminum framing, largely passed through) plus skilled field labor. Net margins are typically thin (often mid-single-digit percent) [5]. Working capital, retainage (owners hold back 5–10% of each bill), and surety-bond capacity make or break a contractor; backlog is the key forward indicator. Full mechanics — percentage-of-completion accounting, bonding, operating metrics — are in section 5 of the 238150 primer.

6. Demand drivers

The master driver is nonresidential construction starts. Offices have softened on high post-pandemic vacancies, while data centers, reshoring/industrial, and institutional work (healthcare, education) are picking up the slack [5][21]. Energy-efficiency retrofits and facade re-cladding are a durable, less-cyclical demand pool, and tightening energy codes pull demand toward higher-value, higher-performance glass [5][22]. Leading indicators to watch: the Architecture Billings Index (ABI) from the American Institute of Architects (AIA), which read 44.5 in May 2026 (below 50 signals contraction) [19], and broad construction-spending and permit data [17][18]. Detail in section 6 of the 238150 primer.

7. Regulation

Glazing is governed by a stack of building and energy codes plus worker-safety rules, not a single agency: the International Building Code (IBC, Chapter 24) for safety glazing and structural performance [15]; the IECC (International Energy Conservation Code) and ASHRAE Standard 90.1 setting minimum glass U-factor and SHGC (Solar Heat Gain Coefficient) by climate zone, tightened each cycle [22]; the Consumer Product Safety Commission's 16 CFR Part 1201 safety-glazing rule [16]; and Occupational Safety and Health Administration (OSHA) fall-protection and silica rules [17][18]. State contractor licensing and Davis-Bacon prevailing wages on federal work add compliance load [20][19]. Full stack in section 7 of the 238150 primer.

8. Consolidation

This is one of the most fragmented trades in construction, and the federal data for this level prove it: the top 4 firms hold just 6.8% of revenue, the top 50 only 23.1%, and the Herfindahl-Hirschman Index (HHI, a standard concentration measure where 10,000 is a monopoly and below ~1,500 is "unconcentrated") is 19.2 [3]. Two forces are reshaping the base: PE roll-ups building regional-to-national platforms out of thousands of founder-owned shops [21][22], and specialization at the top, where a handful of engineering-heavy curtain-wall firms compete for trophy facades at better margins. Full discussion in section 8 of the 238150 primer.

9. Risks

The core risks are the child's risks, unchanged: fixed-price execution (a mis-estimated lump-sum job is absorbed by the glazier); construction cyclicality and interest-rate sensitivity; aluminum and glass cost volatility and tariffs; skilled-labor scarcity and jobsite safety exposure; cash-flow, retainage and bonding strain that regularly bankrupts under-capitalized firms; large-project concentration; and warranty/liability from water intrusion or facade failure. A data-limitation risk also applies to this level: employer-only federal statistics omit nonemployer operators, and the listed proxies mix glazing with adjacent manufacturing. See section 9 of the 238150 primer.

10. How to invest and outlook

Public route: recognize there is no pure-play listed U.S. glazing contractor. Apogee (APOG) is the main way in, with Tecnoglass (TGLS) and Installed Building Products (IBP) as differently-exposed comparables; focus on segment revenue, backlog quality, project-margin adjustments and working capital rather than consolidated earnings [6][9][11][12]. Private route — where the industry actually lives: buy and operate a local or regional contractor, back or build a PE consolidation platform, or participate through employee ownership (ESOPs — Employee Stock Ownership Plans — are common in this trade). Outlook: constructive but uneven — soft new-office glazing offset by data centers, reshoring, institutional work and code-driven retrofit demand, with interest rates, office recovery, and aluminum/glass costs under shifting tariffs as the swing factors. The complete how-to-invest checklist and outlook are in section 10 of the 238150 primer.

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Sources

Drawn from the 238150 child primer; numbering matches that primer.

1. U.S. Census Bureau. "2022 NAICS Manual — Definition of NAICS 238150, Glass and Glazing Contractors (scope and exclusions)." 2022. https://www.census.gov/naics/reference_files_tools/2022_NAICS_Manual.pdf
2. U.S. Census Bureau. "County Business Patterns (CBP), 2023 — NAICS 238150" (establishments, employment, annual payroll, first-quarter payroll). 2023. https://www.census.gov/programs-surveys/cbp.html
3. U.S. Census Bureau. "2022 Economic Census — Receipts and Concentration of Largest Firms, NAICS 238150" (firms, receipts, CR4/CR8/CR20/CR50, HHI). 2022/2025. https://api.census.gov/data/2022/ecnsize/groups/EC2200SIZECONCEN.html
4. IBISWorld. "Glass & Glazing Contractors in the US — Industry Analysis." 2026. https://www.ibisworld.com/united-states/industry/glass-glazing-contractors/205/
5. USGlass Magazine. "The Top 50: USGlass Magazine's 2025 Rankings of the Largest Contract Glaziers." 2025. https://www.usglassmag.com/the-top-50-usglass-magazines-2025-rankings-of-the-largest-contract-glaziers/
6. Glass Magazine. "2026 Top 50 Glaziers" (trade ranking; participation-based, not a census). 2026. https://www.glassmagazine.com/article/2026-top-50-glaziers
7. Apogee Enterprises, Inc. "Form 10-K (fiscal year ended February 28, 2026)" (segment mix, fixed-price revenue %, backlog, revenue recognition). 2026. https://www.sec.gov/Archives/edgar/data/6845/000000684526000023/apog-20260228.htm
8. Tecnoglass Inc. "Form 10-K (year ended December 31, 2025)" (U.S. revenue share; integrated manufacturing/installation). 2026. https://www.sec.gov/Archives/edgar/data/1534675/000149315226008465/form10-k.htm
9. Installed Building Products, Inc. "Form 10-K (year ended December 31, 2025)." 2026. https://www.sec.gov/Archives/edgar/data/1580905/000158090526000004/ibp-20251231.htm
10. U.S. Census Bureau. "Monthly Construction Spending, May 2026." 2026. https://www.census.gov/construction/c30/current/index.html
11. U.S. Census Bureau. "Monthly New Residential Construction, June 2026." 2026. https://www.census.gov/construction/nrc/current/
12. American Institute of Architects. "Architecture Billings Index — May 2026 (reading 44.5)." 2026. https://www.aia.org/resource-center/abi-may-2026-architecture-firm-billings-weaken-further
13. Roofing Contractor / Associated General Contractors (AGC) survey. "Data Centers Lift Construction Outlook, but Economic Worries Grow" (2026 outlook). 2025. https://www.roofingcontractor.com/articles/101738-data-centers-lift-construction-outlook-but-economic-worries-grow
14. National Glass Association / Tom Culp, Birch Point Consulting. "Energy Code Updates" (IECC, ASHRAE 90.1, U-factor/SHGC, 2027 IECC). 2025. https://www.glass.org/sites/default/files/2025-02/Energy%20Code%20Updates%202025%20NGA%20Glass%20Conference%20Carlsbad.pdf
15. International Code Council. "2024 International Building Code, Chapter 24: Glass and Glazing." 2024. https://codes.iccsafe.org/content/IBC2024V1.0/chapter-24-glass-and-glazing
16. U.S. Consumer Product Safety Commission. "16 CFR Part 1201 — Safety Standard for Architectural Glazing Materials" (parallels ANSI Z97.1). https://www.ecfr.gov/current/title-16/chapter-II/subchapter-B/part-1201
17. Occupational Safety and Health Administration. "1926.501 — Duty to Have Fall Protection." https://www.osha.gov/laws-regs/regulations/standardnumber/1926/1926.501
18. Occupational Safety and Health Administration. "1926.1153 — Respirable Crystalline Silica." https://www.osha.gov/laws-regs/regulations/standardnumber/1926/1926.1153
19. U.S. Department of Labor. "Fact Sheet #66: Davis-Bacon and Related Acts." 2023. https://www.dol.gov/agencies/whd/fact-sheets/66-dbra
20. OccupationalLicensing.com (Institute for Justice data). "Glazier Contractor — Residential / Commercial licensing by state" (e.g., California C-17). https://occupationallicensing.com/occupation/glazier-contractor-residential/
21. PCE Investment Bankers. "Building Products & Construction — Q3 2025 (glass-space consolidation / financial-sponsor activity)." 2025. https://www.pcecompanies.com/resources/industry-reports/building-products-construction-q3-2025-pce-investment-bankers
22. Glass Magazine. "Glass Industry M&A." 2025. https://www.glassmagazine.com/article/glass-industry-ma