Architectural, Engineering, and Related Services (United States) — NAICS 5413

A Histometrics rollup primer for a general investing audience — relevant to both public-market and private investors. Core figures are U.S. federal statistics unless noted; forward-looking statements are labeled as judgments. NAICS = the North American Industry Classification System, the U.S. government's standard code for an industry. This page covers the industry group (4-digit) 5413, which aggregates eight child industries. Current as of July 2026.

What this page adds. The eight children look similar on paper — all are licensed or credentialed professional services that sell expertise, not products. The value here is the contrast: one child (Engineering) is three-quarters of the group and is the most investable; the rest range from a steady regulation-driven testing business to a deep-cyclical oil-and-gas niche to hyper-fragmented one-person trades with no public market at all. Section 2 leads with the side-by-side; later sections cover the group as a whole. For any single industry's full detail, follow the linked child primer.

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1. Overview

NAICS 5413 is the design-and-verification layer of the physical economy. Before anything large gets built, financed, drilled, or certified, firms in this group plan it, design it, engineer it, draw it, locate it, map what's underground, inspect it, and test it. They sell professional judgment billed by the hour, own almost no heavy assets, and sit upstream of far larger construction, manufacturing, and energy budgets — so they get paid early in the project cycle and their order books lead the capital-spending cycle.

For an investor, three structural facts define the whole group:

1. It is a people business. Payroll is roughly 44% of revenue group-wide (about $179 billion of payroll against $407 billion of receipts) [1][2]; the main asset walks out the door every night. Profit comes from billing skilled labor at a multiple of its cost.
2. It is dominated by one child. Engineering Services (54133) is about three-quarters of the group's revenue and employment; the other seven split the remaining quarter [1][3]–[10].
3. It is overwhelmingly private and fragmented. Group-level concentration is near the theoretical floor (a Herfindahl-Hirschman Index of 19.9) [1], and for five of the eight children there is essentially no pure-play publicly traded U.S. company. Where public access exists, it clusters in engineering and testing.

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2. What's inside — the eight children and how they differ

NAICS is a nested hierarchy: sector (2-digit) → subsector (3-digit) → industry group (4-digit, this page) → NAICS industry (5-digit) → national industry (6-digit). Group 5413 contains eight 5-digit children (each of which happens to roll up a single 6-digit national industry, so the 5- and 6-digit figures coincide). Here is how they contrast on the four things that matter to an investor. Shares are of the group's 2022 receipts [1][3]–[10].

(AEC = architecture, engineering, and construction. PE here means private equity; where the text means the engineering license it is written "P.E." Tickers and multiples are held for Sections 4 and 10.)

The three families to keep straight:

• The heavyweight (Engineering, ~75%). Big, high-wage, diversified, and the only child with a real menu of investable public companies. Its tailwinds — public infrastructure, power grids, data centers, semiconductor and battery plants — are the strongest and most durable in the group. [3]
• The mid-tier trio (Architecture ~12%, Testing ~7%, Surveying ~2.7%). Each is a real, sizeable industry. But they behave differently: architecture is the group's early-cyclical leading indicator (it turns first), testing is its most defensive member (demand is legally required, not discretionary), and surveying is a supply-constrained roll-up story. [4][8][10]
• The long tail (Landscape, Building inspection, Drafting, Geophysical — together ~3.6%). Small niches with distinct economics and, in most cases, no public pure-play. Two are worth singling out: building inspection rides the housing-transaction cycle (not the construction cycle), and geophysical is decoupled from the rest onto the oil-and-gas capital-spending cycle, the single most volatile demand line in the group. [5][6][7][9]

The economics also split. Six children (Engineering, Architecture, Landscape, Surveying, Drafting, and the field side of inspection) are near-pure billable-hours labor businesses with little capital. Testing is the outlier — a hybrid of a factory and a professional service, with heavy fixed costs (instruments, accredited labs), real operating leverage, and reported margins that make it the group's most "industrial" member. Geophysical is a third model again, mixing crew-utilization work with a data-library royalty business. [8][9] Detail in each child primer.

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

These are our ground-truth federal statistics for NAICS 5413. Receipts and concentration come from the 2022 Economic Census (EC); establishments, employment, and payroll from 2023 County Business Patterns (CBP). The two series use different years and methods and should not be added together as one income statement. [1][2]

The concentration ratios (CR4/CR8/CR20/CR50) are the combined revenue shares of the largest 4, 8, 20, and 50 firms; the HHI is the Census firm-revenue concentration measure (a monopoly scores 10,000, and regulators treat anything under 1,500 as "unconcentrated"). At 19.9, group 5413 is one of the most fragmented parts of the entire U.S. economy. Payroll is ~44% of receipts and average pay is roughly $103,000 per worker ($179.0B ÷ 1.74M) [2] — the twin signatures of a high-skill labor business.

How the children add up. Establishments and employment sum exactly to the group totals (the eight children's establishments total 117,417 and their employees total 1,741,313), and receipts sum to essentially the group figure (~$406.6B of children vs. $406.5B reported — a rounding difference) [1]–[10]. Firm counts do not add cleanly, because a single firm can operate in more than one of these industries and be counted in each. Practically: Engineering (54133) alone is ~$304B of the $406B and ~1.26M of the 1.74M workers, so the group's size, growth, and cycle are mostly Engineering's, with Architecture and Testing the only other material contributors. [3][4][8]

Undercount caveat — large, and worse in some children than others. The $406.5B receipts figure is the revenue of employer firms whose primary business is one of these services — a floor, not a ceiling, for four reasons:

1. Nonemployers are excluded. CBP counts only establishments with paid employees. Several children are dominated by sole practitioners — architecture, landscape architecture, drafting, building inspection, and surveying all have large one-person populations that never appear here — so the true count of businesses is well above 117,417. Our federal file gives no reconciled nonemployer total for this level, so none is asserted. [2]
2. In-house work is invisible. Enormous volumes of design, engineering, surveying, drafting, and testing happen inside the companies that consume them — manufacturers, utilities, energy and technology firms, and construction companies — and are counted in their industries, not here. (The Bureau of Labor Statistics reports roughly two-thirds of surveyors, for example, work at engineering and architecture firms rather than standalone surveying firms. [10])
3. Government does much of it in-house. Public agencies run their own design, mapping, inspection, and testing staffs, captured nowhere in this private-industry count. [2][10]
4. Cross-classification leaks revenue in and out. Contract seismic acquisition for oil and gas can be booked under oilfield support (NAICS 213112) rather than geophysical (54136), and large "testing, inspection and certification" (TIC) firms book much revenue under adjacent engineering and consulting codes. [8][9]

Net: treat $406.5B as the reliable core of the pure-play, employer segment. The total economic footprint of this kind of work is materially larger.

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4. Investable universe (where value concentrates across the children)

Value does not spread evenly. It concentrates in Engineering and Testing for public investors, and in private/employee-owned firms and PE roll-ups for everyone else. Treat every listed name below as an exposure vehicle, not a clean one-for-one proxy — each blends the target activity with construction, software, inspection, defense, or non-U.S. operations that must be stripped out before comparison.

• Engineering (54133) — the deepest public bench. A short list of large, diversified design and program-management firms: AECOM (NYSE: ACM), Jacobs Solutions (NYSE: J), WSP Global (TSX: WSP), Stantec (TSX/NYSE: STN), Tetra Tech (NASDAQ: TTEK), Parsons (NYSE: PSN), Fluor (NYSE: FLR), KBR (NYSE: KBR), Amentum (NYSE: AMTM), and small-cap consolidator Bowman Consulting (NASDAQ: BWMN). A much larger private and employee-owned universe sits behind them (Burns & McDonnell, HDR, Black & Veatch, Kimley-Horn, HNTB), plus PE-backed roll-up platforms. [3]
• Testing (54138) — the cleanest listed "pure-ish" exposure, mostly foreign. U.S.-listed: UL Solutions (NYSE: ULS), TIC Solutions (NYSE: TIC), Mistras Group (NYSE: MG), Montrose Environmental (NYSE: MEG). The global majors — SGS, Bureau Veritas, Intertek, Eurofins, ALS — are foreign-listed (reachable via American Depositary Receipts, or ADRs) and are the deepest pure-plays. PE platforms (Element, Pace Analytical, Applus+) hold much of the rest. [8]
• Surveying (54137) — thin and indirect. Closest listed proxy is Bowman (BWMN); equipment/software "picks-and-shovels" Trimble (NASDAQ: TRMB) and Hexagon (OTC: HXGBY) arm the surveyors; the largest dedicated service platform, SAM Companies, is PE-owned (New Mountain Capital). [10]
• Geophysical (54136) — foreign majors plus two micro-caps. TGS and Viridien (formerly CGG) in data/imaging, Fugro in offshore site characterization — all foreign-listed; U.S. micro-caps Dawson Geophysical (NASDAQ: DWSN) and Geospace Technologies (NASDAQ: GEOS). Most domestic activity is private (e.g., Shearwater). [9]
• Architecture (54131), Landscape (54132), Drafting (54134), Building inspection (54135) — no pure-play public stock. Public exposure is either diluted inside the AEC conglomerates above, or comes through the tools — CAD/BIM software leaders Autodesk (NASDAQ: ADSK), Bentley (NASDAQ: BSY), Nemetschek, Trimble — which capture value as design activity rises. The marquee design firms (Gensler, Perkins&Will, HKS, HOK, SOM; Sasaki, SWA in landscape) are private and employee-/partner-owned. Building inspection adds a franchise/software angle: FirstService (NASDAQ: FSV) owns the largest home-inspection franchise (a rounding error in its results), and Porch Group (NASDAQ: PRCH) owns the leading inspector software. [4][5][6][7]

The single most important takeaway: the public market meaningfully represents only Engineering and Testing. The other ~15% of the group is a private-markets story.

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5. How the money works

Group-wide, this is a billable-hours labor business: revenue ≈ billable staff × utilization (the billable share of paid time) × billing rate, with staff typically billed at roughly 2.5–3× their salary cost to cover overhead and leave a profit. Capital intensity is low; the metrics that drive returns are utilization, the net labor multiplier (net revenue per dollar of billable salary), the overhead rate, backlog / book-to-bill for forward visibility, and days-sales-outstanding on collections. Because overhead is large and fixed while payroll is hard to cut quickly, small swings in utilization move profit sharply — the source of the group's operating leverage and its generally thin (single-digit to low-teens) service margins. [4][10]

Three children break the mold and are worth pricing differently:

• Testing labs (54138) run like a factory-services hybrid: revenue is sample volume × price per test (bench labs) or billable hours × utilization (field crews), sitting on heavy fixed costs for instruments and accreditation. That produces real operating leverage and the group's healthiest reported margins — earnings before interest, taxes, depreciation and amortization (EBITDA) around the mid-teens for typical labs and high-teens for the best global majors. [8]
• Geophysical (54136) earns three ways: contract acquisition (a crew/vessel utilization business), multi-client data libraries (a data-royalty model — shoot data once, license it for years), and instruments. [9]
• Building inspection (54135) is a per-job model: revenue = inspections × average fee (~$344 residential) + add-ons, with a franchise route that trades a ~7% royalty for brand and referral flow. [5]

The one federal figure we can anchor group-wide is that payroll is ~44% of receipts [1][2]; utilization, margin, and backlog are not in our federal file for this level and are drawn only from child-primer company disclosures.

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6. Demand drivers

Nearly all of the group is derived demand — it rises and falls with someone else's construction, capital, or transaction budget — but the source of that demand differs by child, which is why the children do not move together:

• Construction-and-capex cyclical (most of the group): Architecture, Landscape, Surveying, Drafting, and much of Engineering track the building and capital cycle and are interest-rate-sensitive. Architecture leads (architects are hired 9–12 months before ground breaks; the AIA/Deltek Architecture Billings Index — a monthly diffusion gauge where 50 = flat — ran below 50 through 2025 into 2026, signaling contraction). [4]
• Infrastructure- and policy-stabilized (Engineering, Surveying): the Infrastructure Investment and Jobs Act (IIJA, ~$1.2 trillion, 2022–2026), grid and power expansion, water systems, the artificial-intelligence (AI) data-center build-out, and reshoring/semiconductor plants (CHIPS Act) give the largest children unusual forward visibility. [3][7][10]
• Regulation-mandated, non-discretionary (Testing, parts of inspection): environmental, food-safety, drug, product, and building-code rules require accredited third-party testing, making it the group's most defensive demand. The live wave is PFAS (per- and polyfluoroalkyl substances, or "forever chemicals"), with new enforceable drinking-water limits and roughly $1 billion of federal funding in 2026. [8]
• Housing-transaction cyclical (Building inspection): most residential inspections are purchase-triggered, so revenue tracks existing-home sales — which ran near a 30-year low in 2025, pushing the niche into a revenue trough. [5]
• Energy-cycle cyclical (Geophysical): demand is a derivative of upstream oil-and-gas exploration budgets — the first line cut in a downturn — with a growing energy-transition slice (carbon storage, offshore wind, critical minerals). [9]
• Climate/resilience (cross-cutting): green infrastructure, stormwater, floodplain remapping, and climate-adaptation mandates support Landscape, Surveying, and the commercial side of inspection. [6][10]

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7. Regulation

The unifying feature is professional licensure with personal legal accountability — but its form and strength differ sharply across the children, and that is itself an investment fact (licensure is both a moat and a constraint).

• Strong individual licensure ("stamp and seal"): Architecture, Engineering, Landscape Architecture, and Surveying are all state-licensed. An architect, Professional Engineer (P.E.), licensed landscape architect, or Professional Land Surveyor (PLS) must sign and seal the work and carries personal liability. Licensure is state-by-state (the National Council of Architectural Registration Boards, NCARB, counts 55 U.S. jurisdictions; engineers and surveyors are standardized through the National Council of Examiners for Engineering and Surveying, NCEES; landscape architects sit the LARE exam). Federal design work is bought on qualifications-based selection under the Brooks Act and Federal Acquisition Regulation (FAR) Part 36 — reputation over low bid, which supports fees. [4][10]
• Accreditation rather than personal licensure (Testing): labs compete on ISO/IEC 17025 accreditation granted method-by-method, plus environmental (NELAP) and product-safety (Nationally Recognized Testing Laboratory, NRTL) recognitions. Each accreditation is a competitive asset. [8]
• Light or uneven regulation (Drafting, Building inspection): drafters are generally unlicensed (the sealing engineer/architect carries the liability); home inspection is regulated in only ~35 states. Low barriers here drive the deepest fragmentation in the group. [6][5]
• Environmental permitting, not price regulation (Geophysical): the binding constraints are marine-mammal and land-access permits (via NOAA Fisheries, the Bureau of Ocean Energy Management, and the Bureau of Land Management, often triggering National Environmental Policy Act review) — a commercial barrier more than a cost. [9]

Across the group, regulation both creates work (mandated testing, environmental review, accessibility and code compliance) and protects it (licensure limits who can compete).

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8. Consolidation

Group 5413 is a textbook buy-and-build landscape: fragmentation near the theoretical floor (HHI 19.9; CR4 6.3%; even the top 50 firms hold under a quarter of revenue) [1], recurring demand, scarce licensed talent, and a wave of retiring founders supplying sellers. The roll-up is running in every child, though led by different buyers:

• Engineering — strategic + PE, the loudest. WSP acquired POWER Engineers (~$1.78B, 2024) and TRC (~$3.3B, 2025–26); Stantec bought Page; PE advisers put sponsor involvement near 40% of AEC transactions. Many deals are effectively "acqui-hires" for scarce P.E.s. [3]
• Testing — global majors + PE platforms. Acuren's merger with NV5 formed the >$2B TIC Solutions (2025); SGS and Bureau Veritas explored (then abandoned) a ~$33B merger; deal volume topped 280 announced TIC transactions in 2025. [8]
• Surveying — PE buy-and-build. Platforms like SAM Companies (New Mountain Capital) and listed acquirers like Bowman roll up local licensed shops. [10]
• Building inspection — franchise + PE. Brand franchising (Pillar To Post) and residential roll-ups (LaunchPad), plus active PE consolidation of commercial property-condition consultancies. [5]
• Geophysical — crisis-driven. A brutal down-cycle rewired the global top end: TGS and PGS merged (2024) into the largest energy-data company; onshore U.S. bankruptcies left Dawson as effectively the only listed land contractor. [9]

The common thread: consolidation happens at the top and the edges, while the base of each market — thousands of small local firms — stays fragmented.

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9. Risks

• Cyclicality — but graded. The group is early-cyclical overall, yet its members carry very different beta: Architecture and Geophysical are the most cyclical (design billings sub-50 into 2026; oil-exploration budgets are first-cut), Building inspection swings on home sales, while Testing and the infrastructure-tilted parts of Engineering and Surveying are the most defensive. [4][5][8][9]
• Thin margins, high operating leverage. In the labor-business children, a modest revenue drop can erase profit and force layoffs of scarce licensed staff. [4]
• Licensed-talent scarcity and wage inflation. Engineers and surveyors are aging (the average licensed surveyor is ~58); the scarce asset in most deals is people, and wages are rising. [3][10]
• AI and automation — double-edged. Generative-design, BIM, and automated drafting/reporting lift productivity but threaten the billable-hours model, most acutely in Drafting and commodity inspection. [6]
• PE roll-up risk. Aggressive multiples, leverage, and integration risk in sponsor-backed platforms across Engineering, Testing, Surveying, and inspection. [3][8]
• Fixed-price / engineering-procurement-construction (EPC) losses in the engineering segment, and professional liability (design failure, missed defects, drainage/grading) group-wide. [3][5]
• Funding and policy dependence. Much of the current tailwind rests on IIJA money running through 2026, whose reauthorization is uncertain; testing's regulated core is only as strong as enforcement; geophysical's energy-transition slice hinges on subsidies and permits. [3][8][9]
• Measurement risk. The employer-only federal statistics omit nonemployers, in-house work, and government — so reported size is a baseline, not a full census (Section 3). [2]

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10. How to invest, and the outlook

Where the public routes actually are. For listed exposure, the group narrows to two children. Engineering offers the deepest bench of diversified design/program-management firms (ACM, J, WSP, STN, TTEK, PSN, FLR, KBR, AMTM, plus small-cap BWMN), valued as growth-and-cyclical stories on enterprise-value-to-EBITDA rather than yield — compare on organic growth, utilization, fee realization, backlog quality, cash conversion, and fixed-price exposure, not gross revenue. Testing offers the cleanest "pure-ish" exposure, with a few U.S. names (ULS, TIC, MG, MEG) and the deeper foreign majors (SGS, Bureau Veritas, Intertek, Eurofins, ALS) via ADRs. Beyond those two, exposure gets thin and indirect: Surveying (Bowman as proxy; Trimble/Hexagon as tools), Geophysical (foreign majors + micro-caps DWSN/GEOS), and — for Architecture, Landscape, Drafting, and Building inspection — the CAD/BIM software vendors (ADSK, BSY, Nemetschek) as a bet on design activity, since no pure-play stock exists. There is no dedicated ETF for this group, though broad infrastructure funds hold many of the engineering names.

Where the industry actually lives — private markets. Most of NAICS 5413 cannot be bought on an exchange. The real ownership routes are employee ownership (ESOP/partnership), PE-backed AEC and testing platforms, founder-succession and specialist acquisitions, and private credit to the sponsors doing the roll-ups. This is the only way to own architecture, landscape, drafting, and residential inspection at scale, and it is where the consolidation return is being manufactured.

Outlook (forward-looking judgment). The group-level demand backdrop is favorable and unusually broad: infrastructure (IIJA), power and grid expansion, the AI/data-center build-out, reshoring and semiconductor/battery plants, climate/resilience work, and regulation-driven testing (PFAS) are all running at once, giving the largest children rare forward visibility. The tempering factors are real: rate-sensitive commercial construction, a soft architecture leading indicator into 2026, a housing-transaction trough weighing on inspection, oil-cycle volatility in geophysical, and uncertainty over IIJA reauthorization after 2026. The most credible value creation therefore concentrates in two places — the engineering and testing majors on the public side, and private consolidation of the fragmented base — rather than in any single pure-play across the smaller children. This is an industry framework, not a recommendation of any security. For the complete company tables, unit economics, and diligence checklists, read the eight child primers linked above.

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Sources

Headline figures for this level ([1] receipts/concentration; [2] establishments/employment/payroll) are our ingested ground-truth federal statistics for NAICS 5413 (stats-5413.md). Child-level figures and the named-company detail are drawn from the eight child primers (54131–54138), whose own numbered sources give the underlying filings and releases.

1. U.S. Census Bureau, 2022 Economic Census — Concentration of Largest Firms, NAICS 5413 (receipts, firm count, CR4/CR8/CR20/CR50, HHI). Histometrics ingested federal statistics. https://data.census.gov/table/ECNSIZE2022.EC2200SIZECONCEN
2. U.S. Census Bureau, County Business Patterns 2023 — NAICS 5413 (establishments, employment, annual and Q1 payroll). Histometrics ingested federal statistics. https://www.census.gov/programs-surveys/cbp.html
3. Histometrics primer, NAICS 54133 Engineering Services (child), synthesizing 2022 Economic Census / 2023 CBP for 541330, AECOM/Jacobs/WSP/Stantec/Tetra Tech disclosures, IIJA funding, and WSP–POWER/TRC M&A. See primer-54133-DRAFT.md.
4. Histometrics primer, NAICS 54131 Architectural Services (child), synthesizing 2022 EC / 2023 CBP for 541310, the AIA/Deltek Architecture Billings Index (Dec. 2025), AIA Consensus Construction Forecast, Deltek Clarity A&E study, and NCARB licensure. See primer-54131-DRAFT.md.
5. Histometrics primer, NAICS 54135 Building Inspection Services (child), synthesizing 2022 EC / 2023 CBP for 541350, IBISWorld market size, NAR existing-home sales, FirstService/Porch disclosures, and franchise/PE roll-up detail. See primer-54135-DRAFT.md.
6. Histometrics primer, NAICS 54134 Drafting Services (child), synthesizing 2022 EC / 2023 CBP for 541340, BLS Drafters outlook, CAD/BIM software vendors, and offshore ER&D providers. See primer-54134-DRAFT.md.
7. Histometrics primer, NAICS 54132 Landscape Architectural Services (child), synthesizing 2022 EC / 2023 CBP for 541320, BLS Landscape Architects, CLARB/LARE licensure, and climate/green-infrastructure drivers. See primer-54132-DRAFT.md.
8. Histometrics primer, NAICS 54138 Testing Laboratories and Services (child), synthesizing 2022 EC / 2023 CBP for 541380, EPA PFAS methods/limits, ISO/IEC 17025 & NRTL accreditation, TIC-major disclosures (SGS, Bureau Veritas, Intertek, Eurofins, ALS; ULS, TIC, MG, MEG), and Aventis/Houlihan Lokey TIC M&A data. See primer-54138-DRAFT.md.
9. Histometrics primer, NAICS 54136 Geophysical Surveying and Mapping Services (child), synthesizing 2022 EC / 2023 CBP for 541360, TGS/PGS merger, Viridien/Fugro/Dawson/Geospace disclosures, USGS Earth MRI, and global-market forecasts. See primer-54136-DRAFT.md.
10. Histometrics primer, NAICS 54137 Surveying and Mapping (except Geophysical) Services (child), synthesizing 2022 EC / 2023 CBP for 541370, BLS Surveyors, NCEES/PLS licensure and the Brooks Act, IIJA transportation spending, SAM Companies/New Mountain, Bowman, and Trimble/Hexagon. See primer-54137-DRAFT.md.