Other Building Finishing Contractors (U.S.) — NAICS 238390

An 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 238390 is a catch-all "other" bucket inside the building-finishing trades — the specialty jobs done near the end of a construction or renovation project that do not fit the large named finishing trades.[1]

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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, countertops and metal cabinets fabricated or fitted on site, 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 category — the finishing work left over after 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 it is one of the most fragmented in the entire economy. The four largest firms earn only 6.6% of revenue, and the concentration index — the Herfindahl-Hirschman Index (HHI), a standard 0-10,000 market-concentration measure — is just 23.2, near the theoretical floor for "not concentrated at all."[3] That single fact frames how you can participate: there is no dominant listed pure-play. Value here is created mainly through private ownership of local operators, franchise systems, and private-equity roll-ups, with only thin, indirect exposure available in public equities.

• Public route: limited and diluted — the cleanest listed operating exposure is FirstService Corporation, which owns California Closets, but finishing work is only one slice of a diversified property-services company.[6]
• Private route: the center of gravity — buying or franchising a local finishing contractor, or backing a private-equity platform such as the KKR-backed waterproofing roll-up Groundworks.[7]

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2. What it is, and how it's structured

Scope (what's in). The Census Bureau places in 238390 establishments doing building-finishing work not captured by the other specialty finishing codes. Illustrative activities: on-site bathtub refinishing; fabricating and installing metal cabinets and countertops on site; closet-organizer systems; modular/systems-furniture installation; concrete coating, sealing and glazing; waterproofing; trade-show exhibit installation and dismantle; and drapery-hardware, window-shade and blind installation.[1] Firms may work directly for property owners or as subcontractors to a general contractor, and the work spans new construction, additions, alterations, maintenance and repair.[1]

What it excludes (and where that work goes). This is essential context — the name sounds broad, but the largest finishing trades are carved out into neighboring codes:[1]

So 238390 is genuinely the "everything else" of finishing. When market-research firms quote trillion-dollar "building finishing" markets, they are almost always describing the whole 2383 group (drywall, paint, flooring, tile) or global figures — not this specific U.S. residual code, whose true size is far smaller. Treat those headline numbers with care.

Ownership mix. Overwhelmingly small, owner-operated, private businesses. Across the industry there are about 7,065 firms running 8,076 establishments — barely more than one location per firm.[2][3] Average revenue works out to roughly $2.0 million per firm and about 10 employees per establishment (derived from the federal totals below).[2][3] The federal data do not report a public-versus-private ownership split; the low concentration, the prevalence of local specialty contractors, and the absence of a dominant listed pure-play together imply a market led by private local operators — an editorial inference, not a reported statistic. Three organized ownership models layer on top of the mom-and-pop base: (a) franchise systems (e.g., California Closets, Budget Blinds), (b) private-equity (PE) roll-ups (e.g., Groundworks), and (c) manufacturer-plus-dealer networks in window coverings (Hunter Douglas, Springs Window Fashions).[6][7][9]

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3. How big it is (federal figures)

From our ingested U.S. federal statistics:

CR4/CR8/CR20/CR50 are the combined revenue shares of the top 4, 8, 20 and 50 firms; SBA is the U.S. Small Business Administration. The $19 million size standard means essentially every firm in this industry counts as a "small business" for federal purposes[4] — consistent with an average firm around $2 million in revenue.[3]

The undercount caveat (important here). These figures count employer establishments only — businesses with paid employees, tracked in County Business Patterns (CBP). Several 238390 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. The Census Bureau tracks those separately in its Nonemployer Statistics program, where a construction business can qualify with as little as $1 in annual receipts;[5] they are not in the 8,076-establishment or 84,342-employee counts.[2] Our ground-truth dataset does not include a nonemployer figure for this code, so we won't invent one — but the practical takeaway is that the number of businesses actually doing this work is materially larger than the employer statistics suggest, even though the missing operators are individually tiny and add little to total revenue.

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4. The investable universe

There is no U.S.-listed pure-play in NAICS 238390. The industry is too fragmented and too local. What exists instead is a set of partial exposures — one public parent with a genuine operating brand, several public installers/suppliers with only overlapping activity, large private platforms, and upstream suppliers whose shares track demand for finishing work rather than the contracting itself.

Listed proxies (all partial; none maps cleanly to the code).

Suppliers can also serve as demand proxies — for example RPM International (NYSE: RPM), whose Tremco and Euclid units make waterproofing and sealant systems that flow through these crews. Like the retailers, they rise and fall with finishing activity without being 238390 contractors.

Major private platforms and networks (where the direct operators live).

Bottom line: this is a private-markets industry. Tickers, share prices and dividend yields matter only at the FirstService / IBP / supplier / retail edge; the operating economics below play out mostly in privately held companies.

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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 negotiated quote; revenue is the contract price; the gross margin is what's left after direct field labor, materials, any subcontracted work, and equipment. Some firms bill labor and materials separately; others buy materials, add a markup, and deliver a bundled project price. Because fixed assets and entry barriers are low, margins are thin and competition is constant — the average worker earns about $62,800 a year,[2] and labor is the swing cost on nearly every job.

The metrics owners actually watch:

• Field-labor productivity and installer utilization. Revenue per field employee and hours-per-job are the core levers; a crew that finishes a closet or countertop faster earns more per day. Prefabrication (building components in a shop, installing fast on site) is the main way larger players lift productivity.
• Gross margin per job and materials as a % of contract — priced job-by-job, so a mispriced bid shows up immediately. Rework, warranty claims, callbacks and job-site damage all erode it.
• Bid win rate and backlog — signed-but-unstarted work is the closest thing to forward visibility in a project business.
• Working capital and retainage. Contractors front labor and materials and bill on progress; commercial owners typically hold back retainage (often 5-10% of each invoice) until final completion, tying up cash. A contractor can book revenue well before collecting it, while disputed change orders and slow project closeout consume working capital. Slow collections and mechanic's-lien exposure are perennial.
• Customer concentration — dependence on a few general contractors, builders or a single franchisor's lead flow.

Two structures change these economics:

• Franchise model (California Closets, Budget Blinds): the franchisor is asset-light, collecting royalty and marketing fees on franchisee sales while local owners carry the labor and job risk. This is how FirstService participates.[6]
• Private-equity roll-up (Groundworks, Vanterra): buy many small regional operators, centralize lead generation, marketing, procurement and safety/compliance, and earn both operating improvement and a valuation "multiple arbitrage" — small firms bought cheaply, aggregated into a larger, more valuable platform.[7][8]

For the listed installers, investors should track organic growth, installation revenue, gross and branch-level margins, backlog conversion, acquisition integration, warranty reserves, leverage, and earnings before interest, taxes, depreciation and amortization (EBITDA) — plus the central diligence question: how much of the economics is actual finishing installation, versus insulation, roofing, manufacturing, retailing or distribution?

A crucial revenue-mix point: much of 238390 is repair, remodel and renovation (R&R) / aftermarket work — waterproofing an existing home, redoing closets or window treatments after a move, refinishing a tub — rather than new construction. That makes the industry more tied to existing-home turnover and remodeling activity than to housing starts.

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6. What drives demand

Demand comes from four overlapping markets:

• New residential construction — closets, window coverings, waterproofing, fixtures and related installs in new homes.
• Commercial and institutional construction — offices, hotels, healthcare, schools and labs, plus commercial interiors and tenant improvements ("TIs") that drive countertop, systems-furniture and finishing work.
• Repair and remodeling (R&R) — the largest single driver for the residential-facing trades; aging buildings need waterproofing, coatings, replacement fixtures and storage upgrades.
• Maintenance and damage repair — moisture control, concrete sealing and post-disaster/insurance-funded work.

R&R is a partial buffer against housing starts. Harvard's Joint Center for Housing Studies (JCHS) Leading Indicator of Remodeling Activity (LIRA) projected homeowner improvement-and-repair spending to reach roughly $523 billion in early 2027, but with annual growth slowing to about 0.5% — positive in nominal terms, below inflation in real terms.[20]

Other structural supports and drags:

• Existing-home sales and turnover. New owners redo closets, window coverings and baths; home equity funds discretionary finishing. Higher mortgage rates that freeze home sales directly cool this channel.
• The events economy — trade-show and convention calendars drive exhibit I&D labor demand.[10]
• Aging housing stock, water damage and climate risk — a structural tailwind for waterproofing and foundation-water management, often insurance-funded.[7]
• Building codes, energy efficiency, accessibility and water management — regulatory pull-through for finishing work.
• Labor supply. JCHS research finds immigrant workers play an outsized role in construction trades; slower immigration would worsen existing skilled-labor shortages.[21]
• Interest rates sit underneath all of the above, gating both home turnover and construction financing.

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7. Regulation

There is no single federal contractor license; oversight is a patchwork spanning safety, environmental and state-licensing rules.

• State and local licensing, bonding and permits. Requirements vary widely by state and trade; commercial work commonly requires bonding, insurance and inspections, and building/fire/accessibility codes govern much finishing work (e.g., waterproofing details, fire and acoustic assemblies).
• OSHA construction safety rules (Occupational Safety and Health Administration), 29 Code of Federal Regulations (CFR) Part 1926 — fall protection, scaffolding, ladders, personal protective equipment, electrical and general job-site safety.[17]
• Respirable crystalline silica standard (29 CFR 1926.1153), a 50-µg/m³ (micrograms-per-cubic-meter) exposure limit that hits engineered-stone countertop fabrication and installation hardest. OSHA and the Centers for Disease Control and Prevention (CDC) have documented clusters of silicosis — an irreversible lung disease — among engineered-stone workers, prompting a focused enforcement initiative and, in California, an emergency engineered-stone standard.[16] This is a genuine, escalating compliance and liability risk for the countertop segment specifically.
• EPA Renovation, Repair, and Painting (RRP) rule (Environmental Protection Agency). Paid work that disturbs lead-based paint in pre-1978 housing and child-occupied facilities requires firm certification, trained renovators and lead-safe practices.[18] Asbestos rules similarly apply to older-building work.
• Construction stormwater permitting under the National Pollutant Discharge Elimination System (NPDES) can apply when activity disturbs at least one acre, including as part of a larger development.[19]
• Union labor jurisdictions. In many U.S. convention cities, trade-show I&D work is unionized, and contractors operate under local labor agreements.[10]
• Prevailing-wage and procurement rules on federal and public projects; immigration/workforce policy materially affects labor supply for a manual-crew trade.

Compliance raises costs, but it also favors larger operators with formal safety, documentation and training systems. Sole proprietors with no employees fall outside OSHA's employee-protection coverage — another reason the smallest operators sit partly outside the regulated, counted economy.[16]

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8. Competitive dynamics and 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] Competition is local, relationship-driven and price-sensitive, with low barriers to entry that continuously admit new one-truck operators. Customers compare price, workmanship, availability, schedule reliability, warranties, safety records and prior experience.

Where scale does pay off, it comes from advantages the corner operator can't easily match:

• Lead generation and brand trust — national digital marketing and a recognizable name (California Closets; a Groundworks brand) win jobs.
• Procurement — volume buying on stone, metal, glazing sealants and window-covering hardware.
• Prefabrication and process — shop-built components and standardized installs lift labor productivity, especially in commercial finishing.
• Compliance and safety infrastructure — meaningful in silica-exposed countertop work.
• Consumer financing, warranties and multi-market execution — larger players can offer all three, which national builders and commercial customers value.

Consolidation is running on three tracks: PE roll-ups (Groundworks, backed by KKR with Cortec as a minority holder, and Vanterra, backed by Percheron Capital, are the visible foundation/waterproofing platforms),[7][8] franchise scaling (FirstService steadily expanding company-owned California Closets territories),[6] and industrialization/prefab in commercial finishing. Integration risk is high — local brands, technicians, owners and customer relationships are often the principal assets — and even after all this activity, the industry remains overwhelmingly small-business: a long runway for further roll-up, but also a reminder that no single owner is close to controlling it.

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9. Risks

• Cyclicality and rate sensitivity. Demand tracks home turnover, remodeling and commercial capex — all sensitive to interest rates, credit and confidence. Nonresidential building spending is projected to grow only ~1.7% in 2026, with widespread reports of project delays and cancellations.[22][23]
• Thin margins + labor inflation and scarcity. Construction wages are running up roughly 4% year-over-year, with specialized trades higher, squeezing already-slim job margins amid a persistent skilled-labor shortage.[23] Immigration-policy shocks would tighten a manual-labor workforce further.[21]
• Fixed-price execution. A missed estimate, material-cost spike, weather delay or change-order dispute can erase a project's profit.
• Silica/OSHA liability in the countertop segment — silicosis litigation and potential engineered-stone restrictions are a real, growing overhang.[16]
• Collection, lien and retainage risk — cash is tied up until completion; disputes and slow-paying general contractors hurt small balance sheets.
• Input-cost volatility — stone, metal, glass sealants and window-covering components.
• Customer/channel concentration for crews dependent on a few general contractors, builders, retailers or a single franchisor's lead flow.
• Roll-up / franchisor-specific risks — integration missteps, technician turnover, over-leverage, and valuation-multiple compression if acquisition financing tightens.
• Statistical risk. Federal employer statistics understate the number of very small and nonemployer businesses, limiting precision in any market-share analysis.[5]

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10. How to invest, and the outlook

Public-market routes (limited, and proxies rather than direct measurement).

• FirstService Corporation (FSV) — the only listed name with a genuine 238390 operating business (California Closets), but a small part of a diversified ~$5.5B property-services compounder; you're buying the whole company, not the closet business.[6]
• Listed installers as partial reads — Installed Building Products (IBP) and TopBuild (BLD) disclose installation economics, but both are chiefly insulation businesses (238310, excluded); Builders FirstSource (BLDR) is mostly a products supplier.[11][12][13] The diligence question is always the finishing-installation share of revenue.
• Suppliers and retailers as demand barometers — RPM International (RPM) for waterproofing/sealants; Home Depot (HD) and Lowe's (LOW) as renovation-demand proxies. These move with finishing activity without being contractors.[14][15]

Private-market routes (where the industry actually lives).

• Own or acquire a local operator — the classic path; valuations are low and the market is deep, but returns depend on hands-on operating skill.
• Regional buy-and-build — assemble several operators into a platform.
• Buy a franchise or branded dealership — California Closets, Budget Blinds, Re-Bath, Miracle Method and similar systems offer a branded, lead-fed entry with royalty costs.[6][9]
• Back a PE platform — as a limited partner in roll-up funds (the KKR/Cortec model behind Groundworks; Percheron behind Vanterra), capturing operating scale and consolidation upside.[7][8]
• Asset-backed or working-capital financing for established operators.

The highest-quality private targets tend to have recurring repair/maintenance demand, a strong local reputation, trained crews, documented pricing discipline, low owner-dependence, diversified customers, and clean licensing and insurance records.

Near-term outlook (forward-looking). The setup is soft-but-stable rather than boom or bust. New-construction finishing volume faces a modest year — nonresidential spending is forecast up only ~1.7%, with high long-term rates, cautious confidence and labor shortages capping growth; data centers and power are bright spots but carry little finishing content.[22][23] Remodeling should stay nominally positive but roughly flat in real terms (LIRA growth slowing toward ~0.5%).[20] The renovation/aftermarket portions of this industry — 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 (PE roll-ups and franchise expansion) in a still-fragmented field, and watch the silica-regulation trajectory as the key segment-specific wildcard for countertop players. For investors, the practical conclusion is unchanged from the top: enter privately or through franchising and roll-ups, with public markets offering only a side door — and don't assume every finishing contractor deserves a premium multiple.

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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). 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); GoGather — "Top Trade Show Management Companies." https://exhibitconcepts.com/trade-show-industry-anatomy-who-are-the-key-players/; https://gogather.com/blog/top-trade-show-management-companies
11. Installed Building Products, Inc. — 2025 Form 10-K, SEC EDGAR. https://www.sec.gov/Archives/edgar/data/1580905/000158090526000004/ibp-20251231.htm
12. TopBuild Corp. — 2025 Form 10-K, SEC EDGAR. https://www.sec.gov/Archives/edgar/data/1633931/000110465926020481/bld-20251231x10k.htm
13. Builders FirstSource, Inc. — 2025 Form 10-K, SEC EDGAR. https://www.sec.gov/Archives/edgar/data/1316835/000119312526054643/bldr-20251231.htm
14. The Home Depot, Inc. — Form 10-K, SEC EDGAR. https://www.sec.gov/Archives/edgar/data/354950/000162828026019436/hd-20260201.htm
15. Lowe's Companies, Inc. — Form 10-K, SEC EDGAR. https://www.sec.gov/Archives/edgar/data/60667/000006066725000049/low-20250131.htm
16. 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); "Worker Exposure to Silica during Countertop Manufacturing, Finishing and Installation" (OSHA 3768). https://www.osha.gov/silica-crystalline; https://www.osha.gov/laws-regs/standardinterpretations/2023-09-22
17. U.S. Occupational Safety and Health Administration — "1926 — Safety and Health Regulations for Construction." https://www.osha.gov/laws-regs/regulations/standardnumber/1926
18. 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
19. U.S. Environmental Protection Agency — "Stormwater Discharges from Construction Activities" (NPDES). https://www.epa.gov/npdes/stormwater-discharges-construction-activities
20. 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
21. 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
22. American Institute of Architects — "AIA Consensus Construction Forecast, January 2026." https://www.aia.org/resource-center/consensus-construction-forecast/january-2026
23. Associated General Contractors of America — "2026 Construction Hiring and Business Outlook" / "2026 Construction Industry Outlook." https://news.agc.org/economics/2026-construction-industry-outlook/