Interior Design Services (U.S.) — NAICS 54141

An investor's primer for a general audience. Core figures are U.S. federal statistics unless otherwise cited. This is a rollup page: NAICS industry 54141 contains a single national industry, 541410, so this level and that child are effectively the same thing. For full detail, see the 541410 primer.

1. Overview

NAICS 54141 is "Interior Design Services" — the business of planning, designing, and administering the inside of buildings (homes, offices, hotels, stores, hospitals, schools) for how they look, function, and comply with building and safety codes.[1] NAICS stands for the North American Industry Classification System, the federal scheme that organizes the economy into nested codes. This particular code sits inside the broader "Professional, Scientific, and Technical Services" sector, alongside architects, engineers, and consultants.

The key point for this page is structural, not economic: at the five-digit level (54141) the classification has exactly one six-digit child (541410). The two codes describe the identical activity, and the federal statistics for them are the same numbers. So rather than repeat the full analysis, this page states the level's own ground-truth figures and points you to the child primer for everything else.

The one thing worth carrying over up front: this is a people business, not a capital business — firms sell time, taste, technical knowledge, and project management, with almost no assets, inventory, or plant. It is also one of the most fragmented industries in the entire U.S. economy.[2]

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

NAICS uses a nested hierarchy: sector (2-digit) → subsector (3-digit) → industry group (4-digit) → NAICS industry (5-digit) → national industry (6-digit). Most five-digit codes split into several six-digit children. 54141 does not. It has a single child:

When a five-digit industry has only one six-digit child, the two are a pass-through: they cover the same firms, the same receipts, and the same employees. There is no aggregation or blending happening at 54141 — it is simply 541410 under a shorter code. Everything substantive about scope (what's in, what's excluded — architecture at 541310, industrial design at 541420, graphic design at 541430, and so on) lives in the child primer and is not restated here.[1]

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

Because 54141 equals 541410, the federal statistics for this level are simply the industry's own numbers. All figures below are our ingested ground-truth federal data for NAICS 54141:

Undercount caveat — this is the headline. These figures count only businesses with payroll, and interior design is overwhelmingly a solo, self-employed profession. County Business Patterns covers only establishments with paid employees, and the Economic Census excludes nonemployer businesses entirely.[6] Our ground-truth federal data contains no nonemployer total, so none is stated here — but the exclusion is large. Private industry research (IBISWorld) estimates roughly 157,000 total interior-design businesses once non-employer sole proprietors are counted, against the ~16,800 employer establishments in the federal data — perhaps one in ten of the businesses actually operating.[7] Any read that stops at the employer statistics badly understates the industry's true footprint. (For context on the employment picture, the U.S. Bureau of Labor Statistics counts 87,100 interior-designer jobs in 2024, a broader universe than the 55,286 CBP paid employees.[5])

4. The investable universe (where value concentrates)

With a single child, there is nothing to allocate across children — all of the value discussion for this level is the 541410 discussion. In short: there is no publicly traded pure-play interior-design firm. The largest design practices (Gensler, HOK, Perkins&Will, HDR, and peers) are private or employee-owned, and the top 100 U.S. design firms booked a record $6.3 billion in interior-design fees in the 2025 industry survey.[8] Public-market exposure is indirect — through diversified architecture/engineering firms, commercial-real-estate service companies, contract-furniture makers, home-furnishings retailers, and design software. See Section 4 of the 541410 primer for the full proxy table with tickers.

5. How the money works

Firms earn the spread between what a project bills and what it costs to deliver — and the cost is mostly staff time. Billing blends hourly rates, flat/fixed fees, and a cost-plus markup (roughly 15%–30%) on furniture and materials the designer buys wholesale and resells ("FF&E" — furniture, fixtures, and equipment).[10][11] The levers professional-services investors watch are billable utilization, net revenue, net multiplier, project margin, and backlog. Because there is little capital to deploy, returns show up as owner's take-home pay, not return on assets — which is exactly why the industry is easy to enter and hard to scale. Full detail is in the child primer.

6. What drives demand

Demand is cyclical and tied to construction, real estate, and discretionary spending. The residential side moves with renovation and home sales (the "renovate-rather-than-relocate" dynamic supports remodeling when high mortgage rates freeze moves); the commercial side moves with office repositioning, hospitality, retail, health care, senior living, education, and adaptive reuse.[13][14] The measured design market dipped about 2% in 2025 as home sales stayed frozen.[7] See the child primer for the demand breakdown and current forecast detail.

7. Regulation

Interior design is regulated at the state level, and inconsistently — legislation touches the profession in 29 U.S. states plus D.C., Puerto Rico, and Canadian jurisdictions, via either "title acts" (only credential-holders may use a protected title) or the stricter "practice acts."[17][18] The common credential is passing the NCIDQ exam (the National Council for Interior Design Qualification examination).[17] A federal and local overlay — the Americans with Disabilities Act (ADA), the Fair Housing Act, and local building, fire/life-safety, and energy codes — shapes project scope.[19][20] The Small Business Administration (SBA) size standard for this industry is $9.0 million in annual receipts.[4] Detail in the child primer.

8. Consolidation

This is one of the least concentrated industries in the federal data. For NAICS 54141, our ground-truth concentration figures are: top 4 firms hold 3.3% of employer revenue, top 8 4.8%, top 20 7.4%, and top 50 just 11.6%; the Herfindahl-Hirschman Index (HHI, a standard concentration measure where 10,000 is a monopoly) sits at 4.7 — effectively zero.[2] Fragmentation persists because the moats are personal, not structural. Where consolidation is happening, it is on the edges — furniture makers rolling up (HNI–Steelcase; Herman Miller–Knoll), tech-enabled design services converging on selling furniture (Havenly), and adjacent architecture/engineering platforms adding scale — not in the core design-fee category.[18][19][20] See Section 8 of the child primer.

9. Risks

The main risks carry over unchanged from 541410: cyclicality (discretionary, construction-linked demand); no moat / easy entry with acute key-person risk (a studio often is its founder); thin, undiversified economics (no assets, revenue tied to billable hours plus procurement markup); fee and markup pressure from free retailer design services and AI/online tools; office concentration exposure to hybrid work; professional-liability and procurement exposure; a regulatory patchwork across states; and classification/public-proxy risk — federal NAICS statistics and public-company revenue can omit interior work done inside larger A/E, construction, or real-estate platforms, so an investor may own a company with design capabilities while holding little direct exposure to the category.[7]

10. How to invest and the outlook

Public-market routes are indirect — no pure design-services stock exists, so the listed names are exposure types: integrated design & engineering (the closest listed service proxies), commercial-real-estate / workplace services, contract-furniture makers, home-furnishings retailers with design studios, and design software as a picks-and-shovels play. Evaluate each on its own fundamentals — segment fee revenue, backlog, utilization, project margins, cash generation — and do not equate total company revenue with this industry's revenue. Private routes are the direct way in: founding or buying a studio, backing a growing regional commercial-interiors firm, or a succession-driven roll-up of profitable regional practices.

Near-term outlook. The direction depends mostly on interest rates and housing. Construction demand is bifurcated — health care, hospitality, institutional work, remodeling, adaptive reuse, and selected technology facilities look more supportive than traditional office construction.[13][14] The base case is a choppy, low-to-moderate-growth environment rather than a broad boom, with durable client relationships, disciplined project controls, and diversified end markets separating winners from the rest. The structural picture — a very large, growing population of small independent practitioners, no dominant firm, and consolidation confined to the furniture, retail, and A/E-platform edges — is unlikely to change.

For the complete analysis — full investable-universe table with tickers, detailed economics, demand forecasts, and the named private firms — see the 541410 primer, which this page summarizes.

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Sources

1. U.S. Census Bureau. North American Industry Classification System: 541410 Interior Design Services, 2022. https://www.census.gov/naics/?details=541410&input=541410&year=2022
2. U.S. Census Bureau. 2022 Economic Census — Selected Sectors: Concentration of Largest Firms for the U.S. (receipts, firms, CR4/CR8/CR20/CR50, HHI). https://data.census.gov/table/ECNSIZE2022.EC2200SIZECONCEN
3. U.S. Census Bureau. County Business Patterns, 2023 (establishments, employees, payroll). https://data.census.gov/table/CBP2023.CB2300CBP?g=010XX00US
4. U.S. Small Business Administration. Table of Small Business Size Standards (NAICS 541410 = $9.0M receipts), 2023. https://www.sba.gov/document/support-table-size-standards
5. U.S. Bureau of Labor Statistics. Occupational Outlook Handbook: Interior Designers (87,100 jobs 2024; median wage $63,490, May 2024; ~3% growth 2024–2034), 2025. https://www.bls.gov/ooh/arts-and-design/interior-designers.htm
6. U.S. Census Bureau. Economic Census FAQ — nonemployer coverage, 2022. https://www.census.gov/programs-surveys/economic-census/year/2022/about/faq/faq-general.html
7. IBISWorld. Interior Designers in the US — Market Size (2005–2031) (~157,000 businesses; ~$26.8B in 2025; −2% in 2025), 2026. https://www.ibisworld.com/united-states/market-size/interior-designers/1410/
8. Interior Design magazine. Unveiling Interior Design's 2025 Top 100 Giants ($6.3B interior-design fees), 2025. https://interiordesign.net/research/interior-designs-2025-top-100-giants/
9. HomeGuide. 2026 Interior Designer Costs — Charges, Hourly Rates & Fees to Hire, 2026. https://homeguide.com/costs/interior-designer-cost
10. American Society of Interior Designers (ASID). Costs and Fees, 2026. https://mn.asid.org/costs
11. American Institute of Architects. July 2026 Consensus Construction Forecast, 2026. https://www.aia.org/resource-center/july-2026-consensus-construction-forecast
12. Harvard Joint Center for Housing Studies (JCHS). Remodeling Growth to Downshift in Late 2026 (~$518B improvement spending), 2026. https://www.jchs.harvard.edu/blog/remodeling-growth-set-downshift-late-2026
13. Council for Interior Design Qualification (CIDQ). Regulated Jurisdictions and Requirements / Legislative Map (29 states + D.C. + Puerto Rico + Canada; NCIDQ), 2026. https://www.cidq.org/for-advocates/legislative-map/
14. Wikipedia. Interior design regulation in the United States (title vs. practice acts; Alabama 1982), 2025. https://en.wikipedia.org/wiki/Interior_design_regulation_in_the_United_States
15. U.S. Department of Justice. 2010 ADA Standards for Accessible Design, 2010. https://www.ada.gov/law-and-regs/design-standards/2010-stds/
16. U.S. Department of Housing and Urban Development. Design and Construction Requirements of the Fair Housing Act, 2013. https://archives.hud.gov/news/2013/pr13-055.cfm
17. Jones Lang LaSalle. 2025 Form 10-K, 2026. https://www.sec.gov/Archives/edgar/data/1037976/000103797626000037/jll-20251231.htm
18. Woodworking Network. HNI completes $2.2B acquisition of Steelcase, creating $5.8 billion furniture giant, 2025. https://www.woodworkingnetwork.com/management/fdmc-300/hni-completes-22b-acquisition-steelcase-creating-58-billion-furniture-giant
19. MillerKnoll. 2025 Annual Report (SEC), 2025. https://www.sec.gov/Archives/edgar/data/0000066382/000006638225000091/mlknars2025.pdf
20. Modern Retail. How Havenly is expanding from an online design service to a brick-and-mortar retailer after its acquisition spree, 2024. https://www.modernretail.co/operations/how-havenly-is-expanding-from-an-online-design-service-to-a-brick-and-mortar-retailer-after-its-acquisition-spree/