Other Building Finishing Contractors (U.S.) — NAICS 23839

A short investor's primer for public- and private-market readers.

NAICS stands for the North American Industry Classification System, the U.S. federal statistical code set used to organize the economy by industry. Code 23839 is a five-digit NAICS industry inside the building-finishing trades. It is a single-child pass-through: it contains exactly one six-digit national industry, 238390 — Other Building Finishing Contractors, and is effectively identical to it.[1] This page is a brief rollup; for the full picture, read the 238390 primer.

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1. Overview

Other Building Finishing Contractors are the specialty crews that install and finish the last details of a building — custom closets and shelving, on-site countertops and metal cabinets, window blinds, shades and drapery hardware, waterproofing and concrete coating/sealing, modular (systems) furniture, trade-show exhibits, and bathtub refinishing.[1] It is deliberately a residual, "everything-else" category: the finishing work left over once drywall, painting, flooring, tile and finish carpentry are each pulled into their own codes.[1]

Why an investor should care: this is a real, roughly $14.4 billion-a-year U.S. industry by receipts,[3] but one of the most fragmented in the economy — the four largest firms earn only 6.6% of revenue.[3] There is no dominant listed pure-play; value is created mainly through private ownership of local operators, franchise systems, and private-equity (PE) roll-ups, with only thin, indirect exposure in public equities.[6][7]

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

At the five-digit level, NAICS 23839 has a single national industry beneath it, 238390. There is nothing else in the bucket, so the five-digit "industry" and the six-digit "national industry" describe the same firms, the same receipts and the same employment — the two codes are interchangeable in practice.[1]

That is a quirk of how the Census Bureau built the 2383 "Building Finishing Contractors" group. The large named finishing trades each got their own five-digit industry — drywall/insulation (23831), painting (23832), flooring (23833), tile/terrazzo (23834), finish carpentry (23835) — and everything remaining was swept into one residual five-digit code, 23839, which needed only one six-digit child to hold it.[1]

Practical takeaway: every number, driver, risk and investable name discussed here belongs equally to 238390. This page gives the rollup figures and the shape of the opportunity; the 238390 primer carries the full detail on scope, sub-trades, company-by-company exposure, regulation and outlook.

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3. Size (this level's federal figures)

These are our ingested U.S. federal statistics for NAICS 23839 — identical to 238390 because the codes cover the same firms.

CR4/CR8/CR20/CR50 are the combined revenue shares of the top 4, 8, 20 and 50 firms; HHI is the Herfindahl-Hirschman Index, a standard 0–10,000 market-concentration gauge. An HHI of 23.2 sits near the theoretical floor for "not concentrated at all," and average revenue works out to roughly $2.0 million per firm — essentially every operator here is a small business.[3]

Undercount caveat (matters here). These figures count employer establishments only — businesses with paid employees, tracked in County Business Patterns (CBP). Several of this industry's trades — bathtub refinishing, blind and shade installation, closet installation, one-person waterproofing crews — are exactly the kind of work done by sole proprietors with no employees, tracked separately in the Census Bureau's Nonemployer Statistics program (where a construction business can qualify with as little as $1 in receipts).[5] Our ground-truth dataset holds no nonemployer figure for this code, so we don't invent one — but the number of businesses actually doing this work is materially larger than the employer counts suggest, even though the missing operators are individually tiny and add little to total revenue.

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4. Investable universe (where value concentrates)

Because 23839 equals 238390, the investable map is the same one child primer's map. There is no U.S.-listed pure-play — the industry is too fragmented and too local. What exists is a set of partial exposures:[6][7]

• The cleanest listed operating exposure is FirstService Corporation (NASDAQ/TSX: FSV), which owns California Closets — but that is one brand inside a diversified, roughly $5.5 billion property-services company, so you buy the whole firm, not the closet business.[6]
• Listed installers as partial reads — Installed Building Products (NYSE: IBP) and TopBuild (NYSE: BLD) disclose installation economics but are chiefly insulation businesses (NAICS 238310, excluded from this code); Builders FirstSource (NYSE: BLDR) is mostly a products supplier.
• Suppliers and retailers as demand barometers — RPM International (NYSE: RPM) for waterproofing/sealants; The Home Depot (NYSE: HD) and Lowe's (NYSE: LOW) as renovation-demand proxies. These move with finishing activity without being contractors.
• The direct operators live in private hands — the KKR-backed waterproofing roll-up Groundworks; Percheron Capital's Vanterra Foundation Solutions; trade-show installers Freeman and GES; window-covering leaders Hunter Douglas and Springs Window Fashions; and franchises such as Budget Blinds, Re-Bath and Miracle Method.[7][8][9][10]

See the 238390 primer for the full company-by-company table and the "how much is actually finishing installation?" diligence test.

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5. How the money works

Finishing contractors are project-based, labor-and-materials businesses: a job is won by bid or quote, revenue is the contract price, and gross margin is what's left after field labor, materials, any subcontracting and equipment. Fixed assets and entry barriers are low, so margins are thin and competition constant — the average worker earns about $62,800 a year, and labor is the swing cost on nearly every job.[2] Owners watch field-labor productivity, gross margin per job, bid win rate and backlog, and working capital (contractors front labor and materials, and commercial owners typically hold back retainage of 5–10% until completion).

Two structures reshape these economics: the franchise model (asset-light franchisor collecting royalties while local owners carry job risk — how FirstService participates) and the PE roll-up (buy many small operators, centralize marketing, procurement and compliance, and earn both operating improvement and valuation "multiple arbitrage").[6][7][8] A crucial mix point: much of this industry is repair, remodel and renovation (R&R) / aftermarket work, tying it more to existing-home turnover and remodeling than to new housing starts. Full detail is in the 238390 primer.

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6. Demand drivers

Demand comes from four overlapping markets: new residential construction, commercial and institutional construction (including tenant improvements), repair and remodeling (R&R) — the largest single driver for the residential-facing trades — and maintenance and damage repair (moisture control, sealing, insurance-funded work). Underneath sit existing-home sales and turnover, the events economy (trade-show exhibit labor), aging housing stock and climate/water risk (a structural tailwind for waterproofing), building codes and energy/accessibility standards, construction labor supply (immigrant workers play an outsized role), and interest rates, which gate both home turnover and construction financing.[7][10][15][17]

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7. Regulation

There is no single federal contractor license — oversight is a patchwork of state and local licensing, bonding and permits; OSHA (Occupational Safety and Health Administration) construction-safety rules (29 CFR Part 1926 — fall protection, scaffolding, silica); the EPA (Environmental Protection Agency) lead-safe Renovation, Repair and Painting (RRP) rule and stormwater permitting; and union labor jurisdictions in convention-city trade-show work.[16][17][18] The single sharpest, segment-specific overhang is the respirable crystalline silica standard (29 CFR 1926.1153), which hits engineered-stone countertop fabrication and installation hardest — OSHA and the CDC (Centers for Disease Control and Prevention) have documented silicosis clusters among these workers, driving focused enforcement and, in California, an emergency standard.[16] See the 238390 primer for the full regulatory map.

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8. Consolidation

The defining feature is extreme fragmentation: CR4 of 6.6%, the top 50 firms at only 26.3% of revenue, and an HHI of 23.2.[3] Consolidation is running on three tracks — PE roll-ups (Groundworks, backed by KKR; Vanterra, backed by Percheron Capital), franchise scaling (FirstService expanding California Closets), and industrialization/prefab in commercial finishing.[6][7][8] Integration risk is high — local brands, technicians and customer relationships are often the principal assets — and even after all this activity the field remains overwhelmingly small-business, leaving a long runway for further roll-up.

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9. Risks

The risk profile is 238390's: cyclicality and rate sensitivity (demand tracks home turnover, remodeling and commercial capex); thin margins plus labor inflation and scarcity; fixed-price execution risk (a missed estimate or change-order dispute can erase a job's profit); silica/OSHA liability in the countertop segment; collection, lien and retainage risk; input-cost volatility; customer/channel concentration; roll-up- and franchisor-specific risks (integration missteps, over-leverage, multiple compression); and statistical risk — federal employer statistics understate the number of very small and nonemployer businesses, limiting precision in any market-share analysis.[3][5][16]

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10. How to invest & outlook

Public routes are limited and indirect: FSV is the only listed name with a genuine operating business in this code (California Closets), inside a much larger property-services compounder; IBP and BLD are chiefly insulation; suppliers and retailers (RPM, HD, LOW) are demand barometers, not contractors.[6] The private routes are where the industry lives: owning or acquiring a local operator, regional buy-and-build, buying a branded franchise/dealership, or backing a PE roll-up as a limited partner.[7][8][9]

Near-term outlook (forward-looking): soft-but-stable rather than boom or bust. New-construction finishing volume faces a modest year — nonresidential building spending is forecast up only about 1.7%, with high long-term rates and labor shortages capping growth — while remodeling stays nominally positive but roughly flat in real terms (the Harvard Joint Center's Leading Indicator of Remodeling Activity, or LIRA, projects growth slowing toward ~0.5%).[15][17][18] The renovation/aftermarket portions — waterproofing an aging, water-stressed housing stock, insurance-driven repair, closet and window-treatment work tied to home turnover — should prove more resilient than new-build. Expect consolidation to continue in a still-fragmented field, and watch the silica-regulation trajectory as the key segment-specific wildcard. Because this five-digit industry equals its one child, that conclusion applies identically to 238390 — read the 238390 primer for the complete analysis.

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Sources

1. U.S. Census Bureau — "North American Industry Classification System: 238390 Other Building Finishing Contractors" (2022 definition, scope and exclusions; 23839 five-digit industry contains only 238390). https://www.census.gov/naics/?details=238390&year=2022
2. U.S. Census Bureau — County Business Patterns, 2023 (establishments, employment, annual and Q1 payroll for NAICS 238390). https://www.census.gov/programs-surveys/cbp.html
3. U.S. Census Bureau — 2022 Economic Census, Concentration of Largest Firms, NAICS 238390 (receipts, firm count, CR4/CR8/CR20/CR50, HHI). https://www.census.gov/programs-surveys/economic-census.html
4. U.S. Small Business Administration — "Table of Size Standards" (2023). https://www.sba.gov/document/support-table-size-standards
5. U.S. Census Bureau — Nonemployer Statistics (construction-sector receipts threshold). https://www.census.gov/programs-surveys/nonemployer-statistics.html
6. FirstService Corporation — Annual Information Form for the year ended Dec. 31, 2025, SEC EDGAR (FirstService Brands / California Closets). https://www.sec.gov/Archives/edgar/data/1637810/000117184326000985/ex_920194.htm
7. Groundworks — company site and "Groundworks Announces KKR as a New Strategic Partner to Support Growth" (2023). https://www.groundworks.com/; https://www.groundworks.com/2023/02/03/groundworks-announces-kkr-as-a-new-strategic-partner-to-support-growth/
8. Percheron Capital — "Vanterra Foundation Solutions Launches National Platform of Foundation Repair and Basement Waterproofing Services Companies" (2024). https://percheron.com/media/vanterra-foundation-solutions-launches-national-platform/
9. Global Market Insights — "Window Coverings Market Size & Share" (Hunter Douglas, Springs Window Fashions market shares). https://www.gminsights.com/industry-analysis/window-coverings-market
10. Exhibit Concepts — "Trade Show Industry Anatomy: Who Are the Key Players?" (Freeman, GES, I&D labor). https://exhibitconcepts.com/trade-show-industry-anatomy-who-are-the-key-players/
11. U.S. Occupational Safety and Health Administration — Respirable Crystalline Silica standard (29 CFR 1926.1153); "Focused Inspection Initiative in the Engineered Stone Fabrication and Installation Industries" (2023). https://www.osha.gov/silica-crystalline
12. U.S. Occupational Safety and Health Administration — "1926 — Safety and Health Regulations for Construction." https://www.osha.gov/laws-regs/regulations/standardnumber/1926
13. U.S. Environmental Protection Agency — "Renovation, Repair and Painting Program: Contractors" (lead-safe RRP rule). https://www.epa.gov/lead/renovation-repair-and-painting-program-contractors
14. U.S. Environmental Protection Agency — "Stormwater Discharges from Construction Activities" (NPDES). https://www.epa.gov/npdes/stormwater-discharges-construction-activities
15. Harvard Joint Center for Housing Studies — Leading Indicator of Remodeling Activity (LIRA), "Remodeling Growth to Slow Sharply in Early 2027" (2026). https://www.jchs.harvard.edu/press-releases/remodeling-growth-slow-sharply-early-2027
16. Harvard Joint Center for Housing Studies — "Homebuilding and Remodeling Depend on Immigrant Labor in Major Metros" (2026). https://www.jchs.harvard.edu/blog/homebuilding-and-remodeling-depend-immigrant-labor-major-metros
17. American Institute of Architects — "AIA Consensus Construction Forecast, January 2026." https://www.aia.org/resource-center/consensus-construction-forecast/january-2026
18. Associated General Contractors of America — "2026 Construction Hiring and Business Outlook." https://news.agc.org/economics/2026-construction-industry-outlook/