Architectural Services (United States) — NAICS 54131

An investor's primer (rollup level). NAICS = North American Industry Classification System, the U.S. government's standard code for an industry. This is a NAICS industry (five-digit code) that contains a single child, the national industry 541310. Figures below prefer official federal statistics; where a number is a market estimate or a forward-looking judgment, the wording says so. Current as of July 2026.

Read this first: NAICS 54131 has exactly one child — 541310 Architectural Services — and the two are effectively the same industry. This page gives the rollup's own ground-truth stats and the short version of the story. For full detail (fee mechanics, benchmarks, named firms, tickers, regulation, risks, and outlook), see the 541310 primer.

---

1. Overview

Architectural services is the business of planning and designing buildings — deciding what gets built, drawing it, and shepherding the design through construction. It sits at the very front of the construction value chain: an architect's drawings are what a developer finances, a contractor prices, and an engineer details.[1]

Three features define it for anyone underwriting it: it is a people business (the main asset walks out the door every night; profit comes from billing skilled labor at a multiple of its cost), it is early-cyclical (architects are hired 9–12 months before ground breaks, so their billings lead nonresidential construction), and it is overwhelmingly private and small-firm — there is essentially no pure-play publicly traded U.S. architecture company.[8][15]

---

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

At the five-digit level, NAICS splits into national six-digit industries. Architectural Services (54131) has only one:

Because the split is one-to-one, 54131 and 541310 are the same industry described at two levels of the code. There is no aggregation happening here — no sibling industries to blend, no rollup arithmetic. The scope, the firms, the economics, and the federal statistics are identical.

Worth remembering is what sits outside this code, because it carves real "design" work out of the number: landscape architecture (541320), engineering services (541330, a much larger industry where most integrated design firms report), drafting (541340), interior design (541410), and actual construction (Sector 23) are all separate.[1] So the figures below describe pure-play architecture firms, not every dollar of building design performed in the U.S.

For the full breakdown of scope, exclusions, and the small-firm-plus-a-few-giants ownership mix, see 541310, Section 2.

---

3. How big it is

Federal statistics roll up to the same figures as the child (this level is the child):

Payroll is about 39% of revenue — the signature of a labor-driven professional service. Revenue per employee runs roughly $250,000–$260,000.[2][3] (Receipts are 2022 and headcount/payroll are 2023, from different federal programs, so these are approximate and should not be read as a single current market size.)

Undercount caveat — real here, in two directions. (1) Nonemployers are excluded. County Business Patterns counts only establishments with paid employees; because sole practitioners make up a large share of architecture, the ~22,800 establishment count understates the true number of architecture businesses. Our ground-truth file has no nonemployer total for this level, so we do not state one.[2] (2) In-house and cross-classified design is missing — a large amount of building design happens inside engineering firms that report under 541330, and public agencies run in-house design offices captured nowhere here. So $48.6B is best read as the revenue of pure-play employer architecture firms, not the total economic value of architectural design in the U.S.

---

4. Investable universe (where value concentrates)

With a single child, all of the level's value concentrates in that one industry — and within it, the value sits in private firms, not listed ones. There is no pure-play, publicly traded U.S. architecture stock. Public exposure comes only through diversified architecture-engineering conglomerates (where architecture is a minority of revenue) or through design-software companies. The marquee design firms — Gensler, Perkins&Will, HKS, HOK, SOM — are private, employee-owned, or partnership-structured.[6][7]

The full company-by-company map (listed proxies, design-software "picks-and-shovels," and the private leaders with revenues and ownership) is in 541310, Section 4.

---

5. How the money works

Architecture is a billable-hours business with low capital intensity. Net revenue (gross billings minus outside consultants and pass-through costs) drives everything, and three benchmarks decide profitability: utilization (the billable share of staff time, firm-wide targets ~60–65%), the net labor multiplier (net revenue per dollar of billable salary, benchmark ~3.0), and the overhead rate (~150–175% of direct labor). Because overhead is large and fixed and payroll is hard to cut fast, small swings in utilization move the bottom line sharply — the source of the sector's operating leverage and thin (single-digit to low-teens) margins.[11]

Fee structures, project phases, and the working-capital items (receivables, professional-liability reserves, backlog) are detailed in 541310, Section 5.

---

6. Demand drivers

Architecture demand is derived demand for construction, filtered through financing conditions: the nonresidential building cycle, interest rates and credit availability, institutional and public budgets (health care, higher education, government — the stabilizers), and structural booms. As of 2025–26 the dominant boom is data centers and artificial-intelligence (AI) infrastructure, plus industrial reshoring, while traditional offices stay weak and adaptive reuse grows.[10][18] The AIA/Deltek Architecture Billings Index (ABI — American Institute of Architects; a monthly diffusion index where 50 = flat) leads construction spending by 9–12 months and read below 50 for essentially all of 2025 into 2026 (December 2025: 48.5).[8] See 541310, Section 6 for the current forecast detail.

---

7. Regulation

Architecture is a licensed profession, and licensure is the defining regulatory feature. There is no national license: the National Council of Architectural Registration Boards (NCARB) counts 55 U.S. licensing jurisdictions, each issuing its own; a building's architect of record must be licensed where it is built, firms need a state certificate of authorization, and drawings must be stamped and sealed by a licensed architect who takes legal responsibility.[13] Federal work runs on a separate qualifications-based selection track under Federal Acquisition Regulation (FAR) Part 36, implementing the Brooks Act.[14][15] Licensure is both a moat (it limits who can compete and protects fees) and a constraint (you cannot offshore the act of sealing drawings, and it creates real legal exposure). Full detail in 541310, Section 7.

---

8. Consolidation

This is the most fragmented professional-services industry you will find: the four largest firms hold just 5.5% of receipts (CR4), the top 50 only 22.2%, and the Herfindahl-Hirschman Index (HHI, a standard concentration measure) is 18 — far below the ~1,500 threshold regulators consider even "moderately" concentrated.[3] Yet consolidation is the live theme, driven by (1) integration of architecture into larger engineering/AEC firms and (2) private-equity roll-ups (one adviser puts PE near 40% of AEC transactions), with founder succession supplying a steady flow of sellers.[17] See 541310, Section 8.

---

9. Risks

The dominant risk is cyclicality — as an early indicator, architecture feels construction downturns first (the ABI's 2025–26 sub-50 run is a live example).[8] Compounding it: thin margins with high operating leverage (a modest revenue drop can erase profit and force layoffs of scarce licensed staff), sector concentration on the data-center/AI wave, key-person risk, fixed-fee overruns, professional liability, slow collections, and roll-up integration risk. Generative-design and building-information-modeling (BIM) tools are a productivity tailwind but a potential threat to the billable-hours model. Full list in 541310, Section 9.

---

10. How to invest, and the outlook

Because the level equals its one child, the investment routes are identical. Public markets offer only partial exposure: diversified design/engineering companies (AECOM, Jacobs, Stantec, Arcadis, NV5, Willdan) as proxies — don't treat their consolidated revenue as architecture revenue — or higher-margin design-software names (Autodesk, Bentley, Nemetschek, Procore) as a bet on design activity. The real architecture exposure lives in private markets: employee ownership (ESOP/partnership), PE-backed AEC platforms, founder-succession and specialist deals, and private credit.[18][15][17]

Reported outlook: demand is soft — the ABI signaled contraction through 2025 into 2026, and the AIA now projects nonresidential building spending to dip slightly (~-0.3%) in 2026, with data centers, health care, and select public work the stronger areas.[8][9] Forward-looking judgment: the near term hinges on interest-rate relief and on whether the data-center/AI and reshoring booms broaden beyond a few states and clients; institutional work should stay resilient while traditional offices remain weak. For most investors the practical conclusion is unchanged: architecture is a fragmented, private, cyclical people-business best accessed indirectly. For the complete analysis, tickers, benchmarks, and diligence checklist, read the 541310 primer.

---

Sources

1. U.S. Census Bureau, "2022 NAICS Manual — 541310 Architectural Services (definition)," 2022. https://www.census.gov/naics/?details=541310&year=2022
2. U.S. Census Bureau, County Business Patterns 2023 — NAICS 54131/541310 (establishments, employment, annual and Q1 payroll), 2023 (Histometrics ingested federal statistics). https://data.census.gov/profile/541310_-_Architectural_services?n=541310
3. U.S. Census Bureau, Economic Census 2022 — Concentration of Largest Firms, NAICS 541310 (receipts, firms, CR4/CR8/CR20/CR50, HHI), 2022 (Histometrics ingested federal statistics). https://data.census.gov/table/ECNSIZE2022.EC2200SIZECONCEN
4. American Institute of Architects, "AIA Firm Survey Report 2024" (small-firm character, size distribution), 2024. https://www.aia.org/resource-center/aia-firm-survey-report-2024
5. Architectural Record, "Top 300 U.S. Architecture Firms of 2024 / 2025" (firm revenues and ownership), 2024–2025. https://www.architecturalrecord.com/articles/17547-top-300-us-architecture-firms-of-2025
6. American Institute of Architects / Deltek, "Architecture Billings Index (ABI) — December 2025" and 2025–2026 monthly releases (leading indicator, 48.5, backlog months). https://www.aia.org/resource-center/abi-december-2025-architecture-firm-billings-remain-soft-end-year
7. American Institute of Architects, "July 2026 Consensus Construction Forecast" (2026 nonres spending cut to ~-0.3%), 2026. https://www.aia.org/resource-center/july-2026-consensus-construction-forecast
8. American Institute of Architects, "January 2026 Consensus Construction Forecast" (health care +4.6%; office decline), 2026. https://www.aia.org/resource-center/consensus-construction-forecast/january-2026
9. Deltek, "Clarity: 46th Annual Architecture & Engineering Industry Study" (utilization, net multiplier, overhead, backlog, DSO benchmarks), 2025. https://www.deltek.com/en/-/media/pdfs/2025-aec-clarity-report.pdf
10. National Council of Architectural Registration Boards (NCARB), "How to Earn Your Architecture License" (55 jurisdictions; NAAB/AXP/ARE), 2026. https://www.ncarb.org/become-architect/earn-license
11. Acquisition.gov, "Federal Acquisition Regulation, Part 36 — Construction and Architect-Engineer Contracts" (qualifications-based selection), 2026. https://www.acquisition.gov/far/part-36
12. U.S. Code, "40 U.S.C. §§ 1101–1104" (Brooks Act), 2026. https://uscode.house.gov/view.xhtml?path=/prelim@title40/subtitle1
13. AECOM, "Fiscal 2025 Annual Report on Form 10-K," 2025. https://investors.aecom.com/sec-filings/sec-filing/10-k/0000868857-25-000013
14. Jacobs Solutions, "Fiscal 2025 Annual Report on Form 10-K," 2025. https://www.sec.gov/Archives/edgar/data/52988/000162828025053316/jec-20250926.htm
15. Company ownership disclosures — Gensler, HOK, HDR, DLR Group, CannonDesign, HKS (employee-/partner-ownership), 2025–2026. https://www.hok.com/ideas/publications/making-a-difference-by-design-2025-esg-report/
16. Stantec, "Stantec Closes Page Acquisition," 2025, and Perkins&Will, "Architecture Plus Information (A+I) Joins Perkins&Will," 2025. https://www.stantec.com/en/news/2025/stantec-closes-page-acquision-becoming-second-largest-architecture-firm-us
17. Capstone Partners, "AEC Services Sector M&A Update" (PE ~40% of transactions), 2025. https://www.capstonepartners.com/insights/article-aec-services-sector-ma-update/
18. ConstructConnect, "Data Centers Power U.S. Nonresidential Building Growth," 2026. https://news.constructconnect.com/july-2026-data-center-report-year-to-date-spending-four-times-the-2025-record

Full source list (26 references) in the 541310 primer.