Site Preparation Contractors (U.S.)

NAICS 2022 code 238910. NAICS is the North American Industry Classification System, the standard the U.S. government uses to group businesses.

1. Overview

Before a single foundation is poured, someone has to clear the trees, tear down what was there, move the dirt, cut the site to grade, dig the trenches, and get water off the land. That is site preparation. These contractors are the first trade on almost every construction project — a house, a highway, a warehouse, a semiconductor plant, or the sprawling data centers now being built for artificial intelligence (AI, computer systems that learn and generate). They turn raw or previously used land into build-ready sites, and their customers are homebuilders, general contractors, manufacturers, data-center developers, utilities, transportation agencies, municipalities, and mining companies.[1] The work is essential, capital-heavy, cyclical, and intensely local.

Why it matters to an investor: this is a large industry riding two powerful tailwinds — the AI-driven data-center build-out and the reshoring of U.S. manufacturing — while remaining one of the most fragmented industries in the entire economy. That combination (big demand, tens of thousands of small owners) is exactly what draws capital.

The two ways in are very different. Public-market exposure is indirect: most dirt work is buried inside larger diversified builders, so there is no clean large-cap pure play; the closest proxy is Sterling Infrastructure. Private investment is often more direct: acquire a regional excavation firm, back a platform that rolls up smaller operators, finance equipment, or invest alongside developers. Both routes are covered in Sections 4 and 10.

2. What it is and how it's structured

Scope. NAICS 238910 covers establishments primarily doing site preparation: excavating and grading, land clearing and earthmoving (for buildings, non-buildings, and mining sites alike), building and structure demolition, foundation drilling, trenching, dewatering, soil compaction, and septic-system installation. It also includes renting construction equipment with an operator (except cranes).[1]

A typical project chain runs: landowner or developer → general contractor or public agency → site-preparation contractor → equipment, materials, trucking, and specialty subcontractors. The contractor may work as a subcontractor to a general contractor or as the prime contractor directly for the owner.

What it excludes — this matters, because "excavation" gets used loosely:

• Highway, road, bridge, and street construction → NAICS 237310.
• Water, sewer, and utility line construction → NAICS 2371 (237110 / 237120).
• Land subdivision and land development for resale → NAICS 237210.
• Poured concrete foundations and structures → NAICS 238110.
• Earth retention, underwater trenching, and dredging (marine/coastal earthmoving) → heavy civil, NAICS 237990.
• Overburden removal before mineral extraction → classified in mining.
• Hazardous-waste site remediation → NAICS 562910.
• Construction equipment rental without an operator → NAICS 532412; crane rental with an operator also falls outside 238910.[1]

So 238910 is the "dirt work" specialty trade, distinct from the road builders, utility installers, and land developers it works alongside.

Ownership and the basis of competition. The industry is overwhelmingly private, small, local, and owner-operated, with a thin layer of large, well-capitalized players at the top; only a few of those touch the public markets. There is no meaningful government-owned or nonprofit segment. Because hauling soil, rock, aggregate, and waste is expensive, the business is locally rooted, and competitive advantage is practical rather than technological: equipment availability, skilled operators, local permitting knowledge, access to borrow pits and disposal sites, bonding capacity, safety performance, and relationships with developers and public agencies. Our federal source does not report the share of the industry owned by public companies, families, private-equity firms, or employees.

3. How big it is

Federal statistics for NAICS 238910 (ground truth). County Business Patterns (CBP) figures are for 2023; receipts and concentration come from the 2022 Economic Census.

(SBA is the U.S. Small Business Administration.)

This is one of the least concentrated industries in the U.S. economy. The four largest firms take just 2.2% of revenue (the "CR4," or four-firm concentration ratio); the top 8, 3.8%; the top 20, 7.3%; the top 50, 12.3%.[3] The Herfindahl-Hirschman Index (HHI, a standard 0–10,000 concentration score where anything under 1,500 is "unconcentrated") is 3.8 — essentially zero.[3] For perspective, the SBA still considers a firm "small" up to $19 million in average annual receipts,[4] and even the biggest specialist site-prep contractors are a fraction of a percent of the national total. National fragmentation does not mean every local market is unconcentrated — geology, haul distances, permitting, and available equipment can make individual regions far more competitive or more concentrated.

Undercount caveat. The employer-based figures above understate the true operator count. CBP excludes the self-employed, businesses without an Employer Identification Number (EIN), businesses that have an EIN but no employees, and most government workers.[5] Site preparation has low barriers at the small end — one operator and one machine can bid a residential lot — so it has a long tail of nonemployer businesses (sole proprietors with no payroll) that the Census Bureau tabulates in a separate Nonemployer Statistics series.[6] Our ground-truth dataset does not include a nonemployer count specific to 238910, so we flag the direction of the bias (undercounted) without inventing a number. Private market-research estimates of the "site preparation" market vary widely by how they draw the boundary — from roughly $60 billion[8] to $200 billion-plus for a broader "excavation" definition[7] — which is why the federal receipts figure of $158.7 billion[3] is the anchor to trust here.

4. The investable universe

There is no clean public pure play that reports NAICS 238910 as a standalone business. Dirt work is almost always one segment inside a bigger construction company, so an investor has to analyze the relevant segment rather than the whole company. The table shows the most relevant public names; tickers, share prices, and valuation multiples are discussed in Section 10.

"Picks and shovels." Investors can also play the input side: equipment makers (Caterpillar, Deere/John Deere) and equipment-rental firms (United Rentals, Herc) sell to the whole fragmented contractor base rather than betting on any single builder. Aggregates and materials suppliers benefit from the same construction starts.

Private and other major owners. The heart of the industry is private, and the biggest private platforms are often larger and more capable than the narrow public list suggests. Notable examples include family-owned H&K Group (site and land development, demolition, heavy civil, and materials in the Mid-Atlantic)[17] and Kokosing (sitework plus transportation, water, marine, and power)[18]; employee-owned Kiewit and PCL Construction, whose sitework capabilities sit inside much broader civil and industrial businesses[19][20]; Plateau Excavation (now Sterling-owned); Ryan Incorporated Central (Midwest earthmoving); and The Beaver Excavating Company (capable of 20-million-cubic-yard earthwork jobs), alongside thousands of regional firms that appear on industry rankings.[21] Private-equity buyers are increasingly active (Section 8).

5. How the money works

Site-prep owners make money by winning bids and keeping their iron busy. The economics that matter:

• Bidding and contract type. Most work is won competitively on fixed-price (lump-sum) or unit-price bids — so much per cubic yard moved, per linear foot trenched, per acre cleared — with some hourly equipment-rate and negotiated-scope work. The estimate is the business: bid too high and you lose the job; bid too low and you eat the loss. Experienced firms build contingency for the unknowns underground.[22]

• Margins. Gross margins (revenue minus direct job costs — labor, equipment, fuel, materials, subcontractors) typically run 18–28% on site-prep work and thinner, 10–18%, on mass heavy-civil jobs.[22] Net profit margins for independent excavation contractors commonly land in the mid-single digits to low-teens — roughly 5–10% for firms in the $1M–$10M range, occasionally higher with strong management.[22][23] Scaled players doing complex data-center site development earn more: Sterling's E-Infrastructure segment reached adjusted operating margins near 25% in 2025.[9]

• Equipment utilization is the profit lever. Excavators, dozers, scrapers, and haul trucks are expensive fixed costs that only earn when they move dirt. An idle owned machine can cost far more per day than it bills, so utilization — keeping crews and fleet scheduled back-to-back, and renting rather than owning at the margins — separates winners from losers.[22] Seasonality (winter freeze, wet ground) forces idle time that has to be planned around.

• Backlog and book-to-bill. Backlog — signed but not-yet-built work — is the industry's forward gauge; new awards relative to revenue (book-to-bill) show whether that pipeline is growing. Sterling's E-Infrastructure backlog rose 79% year-over-year entering 2026.[9]

• The dirt has surprises. "Differing site conditions" — unexpected rock, groundwater, buried debris, contaminated soil, utility conflicts — trigger change orders that can rescue or wreck a job's margin.

• Revenue recognition and cash. Construction firms generally recognize contract revenue over time under Accounting Standards Codification (ASC) Topic 606, so reported profit depends on estimates of remaining cost and productivity.[11] Cash is less smooth than revenue: mobilization costs are paid up front, and retainage (money the owner holds back until completion), slow-paying applications, and disputed change orders tie up working capital. Public work tends to pay more predictably; private work can offer better margins but greater collection risk.[11]

6. What drives demand

Site prep is a derived-demand, first-in trade: it tracks how much construction is starting, magnified by the size of the sites.

• Data centers — the dominant current driver. The AI build-out is generating enormous earthwork: clearing and grading 50-plus-acre campuses, deep excavation for substations, miles of utility trenching, and stormwater systems, often on compressed schedules.[31] U.S. data-center construction was running at roughly a $45 billion annual rate in late 2025.[31] The scale is structural: the U.S. Department of Energy (DOE) reported data centers used about 4.4% of U.S. electricity in 2023 and projected 6.7%–12% by 2028 — and site-development contractors are paid before the shell, electrical gear, and servers arrive.[32] For Sterling, "mission-critical" work (data centers, manufacturing, semiconductors) made up 84% of its site-development backlog.[9]
• Reshoring megaprojects. Semiconductor fabs (spurred by the CHIPS Act — the 2022 law subsidizing U.S. chip manufacturing, with roughly 90 projects announced across 28 states and a 35% investment tax-credit deadline at the end of 2026) and electric-vehicle (EV) battery plants are massive site jobs.[36]
• Public infrastructure. The Infrastructure Investment and Jobs Act (IIJA, also called the Bipartisan Infrastructure Law) — the 2021 federal law — authorized about $1.2 trillion in total infrastructure spending, including roughly $550 billion in new investment above prior baselines, feeding roadway, bridge, and utility grading and earthmoving.[34] In May 2026 the Census Bureau reported public construction running at a $541.2 billion seasonally adjusted annual rate, with highway construction at $150.6 billion.[33] 2026 is the IIJA's final authorized year, with record spending expected — and a "funding cliff" risk after.[35]
• Housing and commercial starts. Residential subdivisions, multifamily, warehouses, and distribution centers all begin with dirt work — making the industry sensitive to interest rates, since construction is financed.
• Other cyclical and event demand. Mining, landfill, demolition, environmental remediation, and disaster-recovery work all generate earthmoving. Regional booms (Northern Virginia, Texas, Phoenix, Atlanta, Columbus) concentrate demand where the projects land.

7. Regulation

Site prep is where a project first touches the environment and where some of the most dangerous construction work happens, so it is heavily regulated at the project level.

• Worker safety. The Occupational Safety and Health Administration (OSHA) regulates trenching and excavation under 29 CFR (Code of Federal Regulations) 1926 Subpart P. Cave-ins are the leading cause of trenching fatalities. Protective systems (sloping, benching, shoring, or shielding) are required at depths of five feet or more, along with a "competent person" who inspects the excavation.[27] Trench-collapse deaths carry serious liability and enforcement exposure.
• Stormwater / Clean Water Act. Any construction disturbing one acre or more (or smaller work that is part of a larger common plan of development) needs coverage under the U.S. Environmental Protection Agency's (EPA) Construction General Permit, part of the National Pollutant Discharge Elimination System (NPDES), and must maintain a Stormwater Pollution Prevention Plan (SWPPP) with erosion and sediment controls and regular inspections.[25]
• Wetlands. Discharging dredged or fill material into waters of the United States, including wetlands, can require a Section 404 permit from the U.S. Army Corps of Engineers under the Clean Water Act before dirt moves.[26]
• Prevailing wages. The Davis-Bacon Act generally requires prevailing wages on covered federally funded or assisted construction contracts above $2,000 — a real cost factor on public work.[28]
• Local layer. Grading and land-disturbance permits, contractor licensing and bonding, fugitive-dust and noise rules, haul-route limits, septic and utility-locate requirements, and disposal-site rules vary jurisdiction to jurisdiction and add cost and schedule risk.

The principal investment consequence is schedule and cost uncertainty: a permit delay, environmental finding, contaminated-soil issue, or safety incident can destroy the margin on a fixed-price contract.

8. Competitive dynamics and consolidation

Extreme fragmentation is the defining feature. With a four-firm revenue share of 2.2% and an HHI near zero,[3] the industry is a patchwork of local and regional firms. At the small end, barriers to entry are low (a machine, an operator, a bid). At the top end, barriers are high: megaproject data-center and fab work demands large fleets, rapid mobilization, bonding capacity, and safety systems that small firms can't muster. There is little intellectual property; durable advantage is operational — dense regional equipment and crew networks, accurate earthwork estimating, strong safety and compliance records, access to aggregates and disposal, developer and agency relationships, and balance-sheet capacity to bond larger jobs.

Consolidation is accelerating. Private equity (PE — investment firms that buy companies) sees the fragmentation as opportunity and is "rolling up" small contractors into larger regional platforms, often with smaller "tuck-in" acquisitions. Construction-services mergers and acquisitions (M&A) ran to hundreds of deals in 2025, with subcontractor deal volume up sharply, driven by infrastructure spending and labor scarcity.[30][29] The marquee public example is Sterling's roughly $400 million acquisition of Plateau Excavation, which it has grown into a data-center powerhouse; Granite has combined civil construction with vertically integrated materials.[10][11] Expect the top of the market to keep concentrating even as the long tail stays fragmented. For an acquirer, the main risk is not overpaying — it is losing the founder, superintendent, estimator, or operators who actually control customer relationships and production knowledge.

9. Risks

• Cyclicality. Demand rises and falls with the construction cycle and interest rates; a downturn idles fleets and compresses bid margins fast.
• Fixed-price losses. Underpricing a job, or hitting unforeseen rock, groundwater, contamination, weather, utility conflicts, or design changes, falls on the contractor.
• Customer/theme concentration. The current boom leans heavily on a handful of hyperscale data-center buyers and AI capital spending; a regional contractor may also depend on a few homebuilders or agencies. A pullback would hit the fastest-growing segment hardest.
• Labor scarcity. Skilled operators, mechanics, foremen, and estimators are hard to replace; shortages raise wages and cap growth.
• Capital intensity. Heavy equipment ties up cash and loses value when utilization drops.
• Working capital. Retainage, slow-paying customers, disputes, and claims can create liquidity pressure.
• Bonding and insurance. Limited surety capacity can keep a contractor from bidding larger work.[11]
• Input-cost inflation. Diesel, steel, cement, asphalt, trucking, and materials can move faster than fixed contract prices.[11]
• Safety and environmental liability. Trench collapses, struck-by incidents, stormwater violations, and permitting delays carry human, legal, and financial consequences.
• Policy cliffs. IIJA's authorized funding runs through 2026 and the CHIPS construction tax-credit deadline is end-2026 — both could soften public and megaproject demand afterward.[35][36]
• Acquisition risk. Leverage, aggressive add-backs, weak integration, and hidden claims can turn a good operator into a poor investment.

10. How to invest and the outlook

Public routes. The cleanest exposure is Sterling Infrastructure (STRL, Nasdaq), whose E-Infrastructure business is essentially large-scale site development for data centers and factories; note the stock has re-rated dramatically on that theme (up several hundred percent over recent years), so its valuation multiples now price in a lot of growth. Granite Construction (GVA) and Construction Partners (ROAD) offer broader blends of sitework, civil construction, paving, and materials; MasTec (MTZ), Tutor Perini (TPC), and Primoris Services (PRIM) give partial, diversified exposure where site work is a slice of a much bigger business — so their share prices, dividend policies, and earnings multiples reflect the whole company, not the dirt work alone. Great Lakes Dredge & Dock (GLDD, Nasdaq) is the listed marine-earthmoving specialist. For a broader, less company-specific bet, the equipment makers and rental firms (Caterpillar, Deere, United Rentals, Herc) sell into the entire contractor base.

The key for a public investor is to value the relevant segment, not headline revenue. Review segment revenue and margins, backlog by customer and end market, fixed-price versus reimbursable mix, free cash flow after fleet capital expenditure, net debt and equipment financing, acquisition prices and integration results, customer concentration, and safety/claims/bonding disclosures. Useful tools include enterprise value (EV) to earnings before interest, taxes, depreciation, and amortization (EBITDA), free-cash-flow analysis, and asset-based checks on fleet value. Share prices, dividend yields, and multiples should be judged on the investment date — none substitutes for project-level underwriting.

Private routes. This is where the industry actually lives. Options range from directly owning or acquiring a regional excavation firm (small firms trade around low-to-mid single-digit multiples of EBITDA, with scaled platforms commanding more),[24] to backing a platform that rolls up smaller operators, to financing equipment or investing alongside developers. A good target has repeat customers, pricing discipline, a modern fleet, strong supervisors, clean environmental records, and room for professionalization; underwrite normalized owner compensation, maintenance capital expenditure, working capital, fleet replacement, backlog quality, claims, permits, safety history, bonding, and customer concentration. Keep leverage conservative — a few bad projects can erase several years of operating profit. The $19 million SBA size standard[4] and near-zero concentration[3] mean the acquisition runway is enormous.

Outlook. The long-term setup is constructive: land must be prepared before housing, factories, data centers, power facilities, and transportation projects can be built. The near-term setup is unusually strong for the scaled end — the AI data-center build-out and manufacturing reshoring are pushing record earthwork volumes and, importantly, richer margins on complex mission-critical sites (the reason Sterling's site-development margins have climbed toward the mid-20s%).[9] Public infrastructure spending should peak in 2026 as the IIJA runs its final authorized year.[35] The main watch-items are what happens after the 2026 policy cliffs, the durability of AI capital spending, and interest-rate-sensitive housing. The long tail of small local contractors will keep growing at a more pedestrian low-single-digit pace and remain a fertile field for consolidation. In short: an essential, unglamorous trade enjoying a genuinely un-boring moment at the top — cyclical and regional underneath, with the best operators being those that control costs and equipment productivity, choose end markets carefully, and preserve liquidity when bidding turns irrational.

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Sources

1. U.S. Census Bureau. 2022 NAICS: 238910 Site Preparation Contractors (definition). 2022. https://www.census.gov/naics/?details=238910&input=238910&year=2022
2. U.S. Census Bureau. County Business Patterns: 2023 (NAICS 238910). 2025. https://www.census.gov/data/datasets/2023/econ/cbp/2023-cbp.html
3. U.S. Census Bureau. 2022 Economic Census — Concentration of Largest Firms and receipts, NAICS 238910. 2025. https://api.census.gov/data/2022/ecnsize/groups/EC2200SIZECONCEN.html
4. U.S. Small Business Administration. Table of Small Business Size Standards (NAICS 238910). 2023. https://www.sba.gov/document/support-table-size-standards
5. U.S. Census Bureau. County Business Patterns Methodology. 2026. https://www.census.gov/programs-surveys/cbp/technical-documentation/methodology.html
6. U.S. Census Bureau. Nonemployer Statistics. 2025. https://www.census.gov/programs-surveys/nonemployer-statistics.html
7. IBISWorld. Excavation Contractors in the US — Industry Analysis. 2026. https://www.ibisworld.com/united-states/industry/excavation-contractors/206/
8. WiseGuy Reports. Site Preparation Contractor Market Analysis & Forecast. 2025. https://www.wiseguyreports.com/reports/site-preparation-contractor-market
9. Sterling Infrastructure, Inc. Sterling Reports Strong Fourth Quarter and Full Year 2025 Results and Issues Full Year 2026 Guidance. 2026. https://www.strlco.com/news/sterling-reports-strong-fourth-quarter-and-full-year-2025-results-and-issues-full-year-2026-guidance/
10. Sterling Infrastructure, Inc. Sterling Completes Acquisition of Plateau Excavation, Inc. 2020. https://www.strlco.com/news/sterling-construction-completes-acquisition-of-plateau-excavation-inc-and-enters-into-new-credit-agreement/
11. Granite Construction, Inc. 2025 Annual Report (Form 10-K). 2026. https://www.sec.gov/Archives/edgar/data/861459/000086145926000014/a2025annualreport.htm
12. Construction Partners, Inc. 2025 Annual Report. 2026. https://www.sec.gov/Archives/edgar/data/2079999/000119312526177474/2025_annual_report.pdf
13. Primoris Services Corporation. 2025 Annual Report. 2026. https://www.sec.gov/Archives/edgar/data/0001361538/000110465926032238/tm264538d2_ars.pdf
14. MasTec, Inc. Fourth Quarter and Full Year 2024 Results (SEC Form 8-K exhibit). 2024. https://www.sec.gov/Archives/edgar/data/15615/000119312524191835/d866592dex991.htm
15. Tutor Perini Corporation. Form 10-K, Fiscal Year 2024. 2025. https://www.sec.gov/Archives/edgar/data/77543/000007754325000025/tpc-20241231.htm
16. Great Lakes Dredge & Dock Corp. Great Lakes Reports Fourth Quarter and Full Year 2024 Results. 2025. https://www.globenewswire.com/news-release/2025/02/18/3027763/36795/en/Great-Lakes-Reports-Fourth-Quarter-and-Full-Year-2024-Results.html
17. H&K Group. About Us. 2026. https://www.hkgroup.com/company-profile/about-us/
18. Kokosing. About Us. 2026. https://www.kokosing.biz/about-us/
19. Kiewit Corporation. Kiewit Joins White House Infrastructure Talent Pipeline Challenge. 2022. https://www.kiewit.com/newsroom/kiewit-joins-white-house-infrastructure-talent-pipeline-challenge/
20. PCL Construction. Who We Are. 2026. https://www.pcl.com/us/en
21. Siteline. Top 25 Excavation and Site Development Contractors in 2025. 2025. https://www.siteline.com/blog/top-excavation-and-site-development-contractors
22. The Construction CFO. Excavation Contractor Net Profit Margin. 2025. https://constructioncfo.net/excavation-contractor-net-profit-margin
23. Excavating Insurance Partners. Is Excavation a Good Business? Profit Margins, Costs, and Industry Realities. 2025. https://www.excavatinginsurancepartners.com/post/is-excavation-a-good-business-profit-margins
24. CT Acquisitions. Excavation Business Valuation: 2026 Multiples by Segment. 2026. https://ctacquisitions.com/guides/excavation-business-valuation/
25. U.S. Environmental Protection Agency. Stormwater Discharges from Construction Activities (Construction General Permit / SWPPP). 2026. https://www.epa.gov/npdes/stormwater-discharges-construction-activities
26. U.S. Environmental Protection Agency. Permit Program under Clean Water Act Section 404. 2026. https://www.epa.gov/cwa-404/permit-program-under-cwa-section-404
27. U.S. Occupational Safety and Health Administration. Trenching and Excavation — Construction (29 CFR 1926 Subpart P). 2026. https://www.osha.gov/trenching-excavation/construction
28. U.S. Department of Labor. Fact Sheet #66: The Davis-Bacon and Related Acts. 2023. https://www.dol.gov/agencies/whd/fact-sheets/66-dbra
29. Construction Dive. Why private equity's rollup of construction firms increases project risk. 2025. https://www.constructiondive.com/news/private-equity-risk-construction-affiliated-contractors/822534/
30. Capstone Partners. Construction Services M&A Update. 2025. https://www.capstonepartners.com/insights/article-construction-ma-update/
31. Construction Dive. Data center construction rolls into 2026. 2026. https://www.constructiondive.com/news/data-center-construction-rolls-into-2026/808636/
32. U.S. Department of Energy. DOE Releases New Report Evaluating Increase in Electricity Demand from Data Centers. 2024. https://www.energy.gov/articles/doe-releases-new-report-evaluating-increase-electricity-demand-data-centers
33. U.S. Census Bureau. Monthly Construction Spending, May 2026. 2026. https://www.census.gov/construction/c30/current/index.html
34. Federal Highway Administration. Bipartisan Infrastructure Law Overview. 2022. https://www.fhwa.dot.gov/bipartisan-infrastructure-law/docs/BIL_overview_update_2022-11-8b.pdf
35. The Bond Buyer. Transportation infrastructure rides into final year of IIJA with record spending expected. 2026. https://www.bondbuyer.com/news/transportation-infrastructure-rides-into-final-year-of-iija-with-record-spending-expected
36. Congressional Research Service. Semiconductor Fabrication Facilities Funded by the CHIPS Act: Project Status. 2025. https://www.everycrsreport.com/reports/R49031.html