The US Specialty Trade Contractors Industry

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Specialty trade contractors perform the defined-scope work of construction — foundations and structure, building exterior, electrical and other building equipment, interior finishing, and site preparation — generally as subcontractors to a general contractor or directly for an owner. It is the largest and most fragmented layer of the built environment: 393,962 employer firms operating 401,293 establishments and employing 3.66 million people, on $983.9 billion of output in 2022 (U.S. Economic Census, 2022), beneath which sits a sole-proprietor tail larger still.

The peer set is NAICS 238 excluding 238220 — eighteen six-digit codes. Plumbing, heating and air-conditioning contractors are the contractor side of the separately published HVAC & Plumbing peer set and are excluded here so the two peer sets never overlap and no firm is counted twice. Every code is listed on the NAICS code reference.

Adjacent activities sit outside this scope: general building contractors (NAICS 236) and heavy and civil engineering construction (NAICS 237) operate under different dynamics, and landscaping services (NAICS 561730) sits in a different subsector with a large consumer maintenance tail that establishment counts cannot separate from design-and-install work.

The specialty trades are a recurring focus for mid-market private-equity buy-and-build for three structural reasons, each measurable rather than asserted.

First, the fragmentation is extreme and it is the deepest in the built environment. Between 88% and 95% of establishments in the core trades employ fewer than twenty people (Census County Business Patterns, 2023) — 95.4% in painting, 95.1% in finish carpentry, 88.1% in electrical. Nearly 394,000 employer firms operate barely more than 401,000 establishments, meaning the typical firm is a single-location business. Fragmentation of this depth is the precondition for platform consolidation: a small, geographically-bounded operator base provides a deep bolt-on pipeline (Hammer, Knauer, Pflücke & Schwetzler, 2017). For scale, the specialty trades excluding HVAC are roughly three and a half times the HVAC contractor trade by firm count and 3.3 times by output.

Second, labor is the dominant cost across every trade, and the gradient between trades is wide. Payroll represents 24.4% of output for the peer set as a whole, but ranges from 18.8% in framing to 30.4% in painting (Economic Census, 2022). That spread is a structural fact about work content — how much of a trade's output is labor applied on site versus materials passed through — and it separates trades that look superficially similar. Every trade in the peer set is materially more labor-intensive than the distribution channels that supply the built environment, where payroll runs 6–8 cents of every dollar. A consolidation thesis built on one trade's labor economics does not transfer to another.

Third, the trades are not one moving universe. Over the five years to 2023 the establishment base of roofing grew 20.3% on a comparable-cell panel, site preparation 11.5%, poured concrete 10.8%, and electrical 9.1% — while masonry contracted 0.9% (County Business Patterns, comparable-cell panel 2019–2023). Treating "specialty trades" as a single sector average conceals a spread wide enough to invert a thesis. The references report each code separately for that reason.

Underlying all three is a construction cycle whose volume is cyclical but whose composition shifts more slowly. New residential construction permits (U.S. Census Bureau Building Permits Survey) and nonresidential activity drive trade demand at different rates by trade.

Electrical contracting (238210) is the largest single specialty trade and the closest structural analogue to the plumbing and HVAC trade covered in the companion reference: 78,975 firms, 81,249 establishments, 968,734 employees, $249.2 billion of output in 2022. Payroll is 27.7% of output — among the highest in the peer set, reflecting licensed-trade labor content. The establishment base appears in 2,253 counties and grew 9.1% over the five years to 2023.

The segment also contains other building equipment contractors (238290), a heterogeneous "other" category with an unusually large average establishment — 141,908 employees across only 6,611 firms — which is reported for completeness but never used as a headline figure.

The 2381 group covers the trades that put a building up and close it in: poured concrete, structural steel and precast, framing, masonry, glass and glazing, roofing, and siding. Together they operate 97,286 establishments across 1,813 counties (CBP 2023).

The group is internally diverse in a way that matters. Roofing (238160) — 24,082 firms, $69.9 billion output, payroll 19.3% of output — has the lowest labor share and the fastest establishment growth in the peer set, +20.3% over five years. Poured concrete (238110) is comparable in firm count at 22,865 but employs more people per firm and grew 10.8%. Masonry (238140) — 17,971 firms, $28.6 billion — is the one core trade whose establishment base did not grow, at −0.9%. Structural steel and precast (238120) is the outlier on scale: only 3,898 firms but 77,724 employees, roughly 20 per firm against 5 in the finishing trades — a project-scale business rather than a crew-scale one.

The 2383 group — drywall and insulation, painting, flooring, tile and terrazzo, finish carpentry — is the most fragmented in the peer set and the largest by establishment count: 121,980 establishments across 1,614 counties.

Painting (238320) is the most labor-intensive trade in the peer set, with payroll at 30.4% of output across 38,036 firms and $33.0 billion of output, and 95.4% of establishments under twenty employees. Finish carpentry (238350) is similar in shape at 31,865 firms and 95.1% under twenty. Drywall and insulation (238310) runs larger crews — 238,637 employees across 19,568 firms — and flooring (238330) and tile and terrazzo (238340) sit at roughly five employees per firm. These are the trades where the owner-operated firm is closest to the median, and where the sole-proprietor tail beneath the employer base is proportionally largest.

Site preparation (238910) — 39,460 firms, 482,712 employees, $158.7 billion of output — is the second-largest trade in the peer set and the most evenly dispersed code in the Industrial Patterns™ catalogue: it publishes in 2,306 counties, and its ten largest counties hold just 6.1% of the national published base, a smaller concentration than any other code the atlases map. Payroll is 21.5% of output, reflecting equipment content alongside labor. The establishment base grew 11.5% over five years.

All other specialty trade contractors (238990) is large — 41,878 firms — but heterogeneous by construction, and is reported without being used as a headline figure.

The labor-share gradient is the structural signature of the peer set. Payroll runs from 18.8% of output (framing) to 30.4% (painting), against 6–8% in the merchant-wholesale channels that supply the built environment. Every trade here is a labor business; how much of one varies by nearly twelve percentage points. Operators should be benchmarked within a trade, not across the subsector.

Firm-size structure separates crew-scale from project-scale trades. Finishing trades run about five employees per firm; electrical and site preparation about twelve; structural steel about twenty. That difference drives working-capital behavior, supervision ratios, and the practical size of a bolt-on. Two trades with similar firm counts can present entirely different acquisition arithmetic.

Divergent drift is the third theme. Establishment bases moved between −0.9% and +20.3% across the core trades over the same five-year window. Consolidation runway is not uniform across the subsector, and the references report each code separately rather than resolving them into an average.

Geographic dispersion in the specialty trades tracks population and construction activity more closely than any other Industrial Patterns industry. Electrical contractors publish in 2,253 counties and site preparation in 2,306 — essentially the entire populated United States. Ellison and Glaeser (1997) provide the foundational methodology for measuring geographic concentration; applied to these trades it shows them as far less concentrated than manufacturing industries, which cluster around resource bases or historical agglomerations. No region dominates, and the largest counties hold a small share of any code's national base.

That dispersion is a primary structural fact for this peer set rather than a supplement. For trades delivered locally by small crews, where the establishment base sits — and where it has been thickening or thinning — is the geography of the bolt-on pipeline itself. The Add-On Density Atlas maps establishment density at county granularity for the core trades and overlays a five-year drift layer built on a comparable-cell panel, so that a county appearing or disappearing at the publication threshold is never read as real change.

Industrial Patterns publishes three modules for each industry it covers. Operating Benchmarks reports the distribution of operating outcomes across the peer set on four metric families — margin behavior, labor elasticity, capital efficiency, and overhead. Industry Structure Reference describes structural condition — population and composition, size structure, multi-unit structure, revenue class, concentration, dynamics, geography, legal form, labor composition, and the non-employer tail. Add-On Density Atlas maps establishment density and five-year drift at county granularity.

The three are designed to be read together — the operating layer, the structural layer, and the geographic layer of the same named peer set. Each is presented as a distribution of observed patterns, not as a single industry average. Where a source suppresses a cell at fine granularity, the gap is shown rather than imputed. The references do not rank industries, score them, or characterize any structure as attractive — they report what the data reports.

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Bureau of Labor Statistics. (2024). Quarterly Census of Employment and Wages, private national employers, NAICS 238 subsector. https://www.bls.gov/cew/

Bureau of Labor Statistics. (2024). Occupational Employment and Wage Statistics, May 2024 — specialty trade contractor occupations. https://www.bls.gov/oes/

Bureau of Labor Statistics. (2024). Producer Price Index — construction materials and specialty trade contractor series. https://www.bls.gov/ppi/

Ellison, G., & Glaeser, E. L. (1997). Geographic concentration in U.S. manufacturing industries: A dartboard approach. Journal of Political Economy, 105(5), 889–927. https://doi.org/10.1086/262098

Hammer, B., Knauer, A., Pflücke, M., & Schwetzler, B. (2017). Inorganic growth strategies and the evolution of the private equity business model. Journal of Corporate Finance, 45, 31–63. https://doi.org/10.1016/j.jcorpfin.2017.04.006

Internal Revenue Service Statistics of Income. (2022). Corporation Source Book — minor industry detail, special trade contractors. https://www.irs.gov/statistics/soi-tax-stats-corporation-source-book

Scholes, L., Wright, M., Westhead, P., Bruining, H., & Kloeckner, O. (2009). Family-firm buyouts, private equity, and strategic change. Journal of Private Equity, 12(2), 7–18. https://jpe.pm-research.com/content/12/2/7

Syverson, C. (2011). What determines productivity? Journal of Economic Literature, 49(2), 326–365. https://doi.org/10.1257/jel.49.2.326

U.S. Census Bureau. (2022). Economic Census — NAICS 238 specialty trade contractors. https://www.census.gov/programs-surveys/economic-census.html

U.S. Census Bureau. (2024). County Business Patterns — establishments and employment by county and NAICS. https://www.census.gov/programs-surveys/cbp.html

U.S. Census Bureau. (2024). Statistics of U.S. Businesses — firm and establishment counts by enterprise employment size. https://www.census.gov/programs-surveys/susb.html

U.S. Census Bureau. (2024). Business Dynamics Statistics — establishment entry and exit. https://www.census.gov/programs-surveys/bds.html

U.S. Census Bureau. (2023). Nonemployer Statistics — sole-proprietor tail at 4-digit industry brackets. https://www.census.gov/programs-surveys/nonemployer-statistics.html

U.S. Census Bureau. (2024). Building Permits Survey — new residential construction. https://www.census.gov/construction/bps/

U.S. Census Bureau. (2022). North American Industry Classification System (NAICS). https://www.census.gov/naics/