Siding Contractors (U.S., NAICS 23817)

Read this first — this is a roll-up page. NAICS (North American Industry Classification System) code 23817 is a five-digit "industry" level that contains exactly one child industry, 238170 Siding Contractors. At this level the two are effectively identical: every establishment, worker, and dollar counted under 23817 is the same one counted under 238170. This page gives the level's own ground-truth federal statistics and the short version of the investment story. For the full detail — unit economics of a job, the investable universe, demand drivers, regulation, consolidation, and how to invest — read the 238170 primer.

1. Overview

Siding contractors install the exterior skin of a building — vinyl, fiber cement, engineered wood, aluminum, or steel siding, plus the gutters, downspouts, fascia, soffits, and flashing that usually go with it. It is a labor-intensive, local, project-based trade: crews bid a job, buy materials from a distributor, install over a few days, and move on. The work spans new construction, additions, alterations, repairs, and maintenance.[1]

Why it matters to an investor — public or private — is that siding sits at the intersection of two durable spending streams: new-home construction and the much larger, more stable repair-and-remodel (R&R) market, where U.S. homeowner improvement spending has run near a record ~$524 billion.[4] A meaningful slice of demand is non-discretionary (aging homes, storm damage funded by insurance), which cushions the cyclicality. There is no listed pure-play siding contractor — the trade is overwhelmingly private and fragmented — so public investors get indirect exposure through material makers and distributors, while private investors buy or back local installers directly. All of that detail lives one level down, in 238170.

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

NAICS is a nested hierarchy. The five-digit industry 23817 is the parent of six-digit national industries. Here there is only one of them:

Because 238170 is the only child, the parent contains nothing the child does not. The U.S. Census Bureau assigns 23817 exactly one national industry, so the roll-up is a pass-through: 23817 = 238170. (In many other NAICS families a five-digit industry splits into several six-digit children whose figures must be summed; here there is nothing to sum.) The scope — installing wood, aluminum, vinyl, or other non-masonry exterior finish, plus gutters and downspouts, on new and existing work — and the explicit exclusions (masonry under 238140, curtain wall under 238190, roofing under 238160, and siding manufacturing, which is a factory activity, not a contractor code) are identical at both levels.[1]

3. How big it is (this level's roll-up figures)

These are our ingested ground-truth federal statistics for NAICS 23817. Because the level has a single child, they equal the 238170 figures exactly. The years differ because the sources are separate federal programs; do not treat them as a single-year trend series.

The Herfindahl-Hirschman Index (HHI, a standard market-concentration measure) is suppressed in our federal source for this level, so no value is stated. The implied average establishment has about five employees and the average firm about $1.3 million in receipts.

Undercount caveat — real here. These figures cover establishments and firms with payroll. They miss two big pieces. First, nonemployer siding businesses — self-employed installers and one- or two-person crews with no payroll — are excluded from the counts, and small/individual ownership dominates this trade, so the true operator population is materially larger. Second, an enormous amount of siding installation is performed by firms classified elsewhere (roofing contractors, general remodelers, direct-to-consumer exterior remodelers). For that reason private research firms put the U.S. siding contractor-services market nearer ~$18 billion and ~35,000 contractors — well above the ~$10.8 billion and ~8,600 employer firms the Census counts.[5] Treat those private estimates as order-of-magnitude, not directly comparable. The honest read: the federal data accurately describe the employer core of the trade; the full activity of installing siding in the U.S. is larger.

4. Where value concentrates (investable universe)

Because 23817 has a single child, the investable map is exactly the 238170 map — summarized here, detailed there. There is no listed pure-play siding installer. Public exposure runs through three adjacent layers plus private consolidators:

• Material makers (most direct to siding product, but manufacturing economics): James Hardie (JHX, fiber cement), Louisiana-Pacific (LPX, engineered-wood siding), Westlake (WLK, vinyl and other exterior products).
• Distribution and diversified installation: QXO (Beacon distribution plus TopBuild's installation platform), Builders FirstSource (BLDR), Installed Building Products (IBP), with Home Depot (HD) and Lowe's (LOW) as retail-channel proxies.
• Private consolidators and remodelers: Power Home Remodeling, ABC Supply (distributor), and private-equity (PE) exterior-services roll-ups (Vertex Service Partners, Infinity Home Services, Omnia Exterior Solutions, Aligned Exteriors Group).

None gives clean, direct exposure to siding-contractor economics; the value that is actually 238170 sits in the private, fragmented long tail. See the 238170 primer for the full table and the important caveat that each listed proxy reflects siding only partially.

5. How the money works

A siding contractor is a project-margin business, not a recurring-revenue one — owners earn on the spread between the price of an installed job and its cost in materials, labor, and overhead. Work is priced per square foot (or per "square" = 100 sq ft); materials run roughly 40–50% of job cost and labor 35–55%, leaving thin net margins (single digits to low teens) after sales and marketing, trucks and lifts, insurance, bonding, permits, and warranty. Two channels differ: the new-construction (builder) channel is higher-volume/lower-margin and rate-sensitive; the repair/remodel/replacement (homeowner) channel is higher-margin, steadier, and often storm- and insurance-funded. Revenue is seasonal and lumpy, and scale is hard because labor is local and hands-on. Full unit economics are in the 238170 primer.

6. What drives demand

The demand drivers are identical to the child's: an aging housing stock and replacement cycle (vinyl lasts ~20–40 years, fiber cement ~30–50); record-level repair-and-remodel spending (~$524 billion) with aging homes, energy efficiency, and resilience as tailwinds;[4] existing-home sales and home equity (siding is often replaced around a sale, and big-ticket jobs are frequently financed, so demand softens when rates rise); new single-family construction for the builder channel; weather and storms (hail, wind, hurricanes drive insurance-funded, partly counter-cyclical replacement); and a material-mix shift from vinyl toward premium fiber cement and engineered wood that raises the dollar value per job. Harvard's Leading Indicator of Remodeling Activity (LIRA) projects remodeling-spending growth slowing to roughly 0.5% by early 2027, even as the level stays near record highs.[6]

7. Regulation

Regulation is the same at both levels and applies to the installer, not the code number. Licensing is state- and local-level and highly variable (no federal siding license). OSHA (the Occupational Safety and Health Administration) construction standards require fall protection at six feet and govern ladders, scaffolds, and lifts; cutting fiber-cement board triggers OSHA's respirable crystalline silica standard (29 CFR 1926.1153; CFR = Code of Federal Regulations). The EPA (Environmental Protection Agency) Lead Renovation, Repair, and Painting (RRP) Rule applies whenever painted surfaces are disturbed in pre-1978 housing. Local building codes and permits (commonly based on the International Code Council I-Codes), consumer-protection statutes, and Form I-9 employment-eligibility enforcement round it out. Full detail is in the 238170 primer.

8. Consolidation

The industry is extremely fragmented: the largest four firms hold only ~11.1% of receipts, the top 8 ~14.6%, the top 20 ~19.8%, and even the top 50 just 28.4%; the HHI is suppressed but clearly very low.[3] Three forces are reshaping it — PE roll-ups buying local siding/roofing/exterior installers at mid-to-high-single-digit EBITDA (earnings before interest, taxes, depreciation, and amortization) multiples and centralizing marketing and procurement; distribution/installation consolidation (QXO's ~$11 billion Beacon and ~$17 billion TopBuild deals); and manufacturer pull-through via certified-contractor programs. None of this yet proves the direct siding-contractor market has concentrated. The 238170 primer covers the deal cadence and the roll-up value-creation-versus-risk trade in full.

9. Risks

Same risk profile as the child: housing and rate cyclicality (builder channel and financed remodels contract when rates rise, partly offset by non-discretionary storm demand); labor availability and cost (a heavily foreign-born workforce exposed to immigration enforcement, with construction wages ~9% above the private-sector average);[7] material-cost and tariff volatility (vinyl resin, fiber cement, aluminum, steel); thin margins and fixed-price risk on bid work; safety and insurance (falls, silica); seasonality and customer concentration; compliance penalties; and PE leverage against volatile cash flows. For public investors there is the added indirect-exposure risk that the listed proxies are materials, distribution, or insulation-weighted businesses whose results reflect siding only partially.

10. How to invest and outlook

Because 23817 is a single-child pass-through, the how-to-invest map is exactly the 238170 map. Public routes are indirect: material makers (JHX, LPX, WLK) for product exposure with manufacturing economics; distribution/installation (QXO, BLDR, IBP) and retail (HD, LOW) for channel exposure — none a pure siding play, so size positions accordingly. Private routes are direct: acquiring or backing regional siding/exterior contractors, the exterior-services roll-up (Vertex, Infinity Home Services, Omnia, Aligned Exteriors), the direct-to-consumer remodeler model (Power Home Remodeling), private credit against receivables and equipment, or franchising and manufacturer-certified networks as lower-cost entry points. Because the trade is so fragmented, sourcing and integration — not underlying demand — are the hard part, and the diligence priority is job-level economics (customer-acquisition cost, close/cancellation rates, crew productivity, warranty history, cash conversion, and the true share of revenue that is actually siding).

Outlook. Near term is mixed: remodeling should be steadier than new construction, but broad growth is decelerating (LIRA points to ~0.5% by early 2027) and financing costs matter.[6] Structural tailwinds — an aging housing stock, deferred exterior maintenance, the vinyl-to-fiber-cement mix shift, storm-driven replacement, and accelerating consolidation of a very low-concentration market — look more durable than the near-term cycle. Watch labor supply and input-cost/tariff inflation, both of which can compress already-thin margins even when demand holds.

Bottom line: 23817 is not a distinct market from 238170 — it is the same industry viewed one rung up the NAICS ladder. Use this page for the level's headline federal statistics; go to the 238170 primer for everything else.

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Sources

1. U.S. Census Bureau, "2022 NAICS Definition — 238170 Siding Contractors" (scope and cross-references). https://www.census.gov/naics/?input=238170&year=2022&details=238170
2. U.S. Census Bureau, "County Business Patterns 2023 (NAICS 238170)," 2025. https://data.census.gov/table/CBP2023.CB2300CBP?codeset=naics~238170
3. U.S. Census Bureau, "2022 Economic Census — Concentration of Largest Firms / Selected Statistics (NAICS 238170)," 2024–2025. https://data.census.gov/table/ECNSIZE2022.EC2200SIZECONCEN
4. Joint Center for Housing Studies of Harvard University, "Remodeling Soars to New Heights, but Industry Struggles to Address Labor Shortages and Urgent Needs for Energy Efficiency and Disaster Resilience," 2025. https://www.jchs.harvard.edu/press-releases/remodeling-soars-new-heights-industry-struggles-address-labor-shortages-and-urgent
5. Fortune Business Insights, "Siding Market Size, Share, Growth & Trends Forecast," 2025. https://www.fortunebusinessinsights.com/siding-market-117264
6. Joint Center for Housing Studies of Harvard University, "Remodeling Growth to Slow Sharply in Early 2027" (Leading Indicator of Remodeling Activity), 2026. https://www.jchs.harvard.edu/press-releases/remodeling-growth-slow-sharply-early-2027
7. Roofing Contractor, "Labor Shortages Mount Under Tariffs, Immigration Crackdown," 2025. https://www.roofingcontractor.com/articles/101248-labor-shortages-mount-under-tariffs-immigration-crackdown