New Single-Family Housing Construction (except For-Sale Builders) — NAICS 236115

A Histometrics industry primer for public- and private-market investors

1. Overview

The North American Industry Classification System (NAICS) — the federal scheme for sorting businesses by activity — uses code 236115 for the general contractors who build new single-family homes to order: under a direct contract with a customer, typically on land the customer already owns or controls, rather than building houses on the builder's own account to sell. In plain terms, this is the custom and "build-on-your-lot" home-builder industry — the firm you hire to put a house on your acreage, not the production builder who develops a subdivision and sells you a finished spec home. [1]

That one distinction — building for a client versus building inventory to sell — shapes everything. It is a fragmented, service-heavy construction trade, not a manufacturing or public-equity sector. The marquee, publicly traded homebuilders (D.R. Horton, Lennar, PulteGroup, NVR) build for sale on their own land and sit in a different code, NAICS 236117 (New Housing For-Sale Builders). [2] As a result, 236115 has essentially no pure-play public company. It is a main-street industry of roughly 54,000 mostly small, private, local builders. [5]

• Public-market way in: indirect and imperfect — a couple of listed builders with disclosed build-on-your-lot segments, the larger for-sale production builders, the building-products suppliers who sell to all builders, and homebuilder ETFs (exchange-traded funds). See Section 4.
• Private-market way in: direct — owning or operating a custom-building business, funding a regional "on-your-lot" builder or franchise, providing construction lending or working capital, or investing upstream in land, lots, and materials.
• The core investment question is execution: can the builder price jobs correctly, secure skilled trades, control cycle time, manage customer change-orders, and convert contracts into cash without cost overruns or warranty losses.

2. What it is and how it's structured

Scope. Establishments whose primary business is acting as the general contractor (GC) for the entire construction of a new single-family house — detached houses and townhouses/row houses (each unit separated from its neighbor by a ground-to-roof wall, nothing built above or below). It includes on-site assembly of modular and prefabricated houses, plus single-family design-build firms and construction-management firms acting as the GC. [1]

A typical 236115 builder: (1) designs or adapts a home plan; (2) evaluates the customer's land — utilities, access, drainage, soils, permitting; (3) pulls permits and coordinates subcontractors; (4) procures materials and manages construction; (5) delivers the finished home and provides warranty service. [1]

What it excludes (the adjacent codes worth knowing):

• 236117 — New Housing For-Sale Builders: builders who construct homes on their own account to sell (spec/"merchant"/production builders). Where the large public homebuilders sit. [2]
• 236116 — New Multifamily Housing Construction (except For-Sale Builders): apartment/condo buildings built to order. [1]
• 236118 — Residential Remodelers: additions, renovations, rebuilds of existing homes. [1]
• 237210 — Land Subdivision: developing raw land into building lots. [1]
• 238xxx — Specialty Trade Contractors: the subcontractors (framing, plumbing, electrical, HVAC, roofing) a GC hires. [1]
• 531110 — Lessors of Residential Buildings: owners who build on their own account to lease, not to contract-build for others. [1]
• Sector 31–33 (Manufacturing): the factory that fabricates a modular/prefab home (as opposed to the on-site assembly captured here). [1]

Ownership mix. Overwhelmingly private, local, and small. The federal count is 60,635 establishments run by 54,266 firms — meaning most firms operate a single location. [3][4] Averaging the federal figures, a typical firm books about $2.2 million in annual receipts and a typical establishment employs roughly four people. [3][4] Ownership is dominated by owner-operators, family businesses, and closely held S-corporations, with a thin top tier of multi-state "on-your-lot" brands and cost-plus franchises (Section 8). The public-versus-private revenue split is not published at the 236115 level. [4]

3. How big it is

Federal statistics for NAICS 236115 (U.S.). Note the figures mix two programs and two years — 2022 Economic Census and 2023 County Business Patterns — so they are not a single-year operating snapshot:

At a $45 million size standard from the U.S. Small Business Administration (SBA) — a government eligibility threshold, not a typical-revenue estimate — against a ~$2.2 million average firm, virtually the entire industry qualifies as a small business. [5][6]

The federal extract does not publish an industry-wide gross margin, capacity-utilization measure, backlog, warranty rate, geographic revenue split, or public-versus-private split for this code; where those are absent we say so rather than estimate.

The undercount caveat — important here. County Business Patterns (CBP) counts only employer establishments (those with paid employees). Home construction is thick with nonemployer businesses: self-employed general contractors and one-person builders who subcontract every trade and carry no payroll. The Census Bureau's separate Nonemployer Statistics program counts construction nonemployers in the millions industry-wide (roughly 92% of them sole proprietors). [7] So the true population building single-family homes to order is materially larger than the 60,635 employer establishments, and the $117.8 billion receipts figure understates total contract-building activity. This is the biggest statistical blind spot for 236115 — and it confirms the industry is small-operator-dominated, not government- or corporate-dominated.

For scale in the other direction: most new single-family homes are built by the for-sale production builders in 236117. The custom/contract slice measured here is roughly 20% of single-family housing starts — about 186,000 custom starts out of ~943,000 single-family starts in 2025. [8][9]

4. The investable universe

There is no pure-play public company in NAICS 236115. The custom/contract builders that make up this code are private and mostly small; public-market investors get exposure only through neighbors of the industry. The table separates the tiers.

Scale figures for the public builders reflect their 236117 for-sale businesses, shown only because they are the nearest tradeable proxy for single-family construction. The named private builders are among the larger custom operators, yet even they are a rounding error against the ~54,000-firm total. [5]

5. How the money works

Custom/contract builders earn a fee for building someone else's house, not a gain on selling their own inventory. That flips the economics versus the public production builders: little to no speculative land or finished-home inventory on the balance sheet, far lower capital intensity, and revenue recognized over the life of each contract (percentage-of-completion) against a schedule of progress "draws" tied to construction milestones. A Dream Finders public filing illustrates the mechanics: for customer-controlled-land jobs the builder acts as GC, draws funds on a schedule agreed among bank, customer, and builder as labor and materials are completed, and recognizes revenue over the construction period. [12][20]

The basic formula: contract price plus approved change-orders, minus materials, labor, subcontractors, permits, site work, overhead, financing, and warranty costs, equals operating margin. Customer-owned land removes land-acquisition and carrying risk but adds site-specific uncertainty — difficult soils, utility connections, access, drainage, permitting, design changes, and customer delays.

Two pricing models drive margins:

• Cost-plus: the builder bills actual costs plus a markup or fixed fee (commonly ~15–25%). Lower margin-miss risk because overruns pass through to the client; transparent, but caps upside. [20]
• Fixed-price (lump-sum): one contracted price, with a higher built-in margin to absorb material/labor swings — and the place a builder can lose money if costs run over the estimate. [20]

The metrics owners actually watch: signed backlog (the forward-revenue gauge); gross margin by job and market (typically ~20–30% — cost-plus leaner at ~20–26%, fixed-price higher to cover risk); build-cycle time; change-order conversion and pricing discipline; cancellation and customer-financing rates; construction-in-progress and contract assets; cash collected versus costs incurred; subcontractor availability; and warranty reserves. [20]

Net margins are thin and volatile. The National Association of Home Builders' (NAHB) 2025 Cost of Doing Business study put the average single-family builder at an 8.7% net margin (2023), with the top quarter near 17.7% and the bottom quarter losing money (–1.4%). [21] Because overhead (office, supervision, insurance) is largely fixed, volume is the margin lever — too few homes and general-and-administrative (G&A) cost eats the profit. Builders also float subcontractor and material costs between draws and against retainage, so cash-flow timing, not just profit, sinks undercapitalized firms.

No margin index is published for this code specifically, but the Bureau of Labor Statistics (BLS) Producer Price Index (PPI) for construction inputs and Employment Cost Index (ECI) for labor are useful gauges of margin pressure. [22]

Because custom clients skew wealthier and often pay cash or use their own construction loans, the segment is somewhat less rate-sensitive than production building — custom starts actually grew ~3% in 2025 even as overall single-family starts fell ~7%, helped by rising household wealth and a strong stock market while spec building pulled back. [8][9]

6. What drives demand

• Interest and mortgage rates — the dominant housing-cycle driver; less acute for custom clients leaning on cash or construction loans, but still the swing factor for affordability.
• Land and lot ownership — this industry is built on customers who already own the land: inherited acreage, rural/exurban lots, teardown sites, Sun Belt in-migration. Developed-lot supply and lot prices set the ceiling.
• Existing-home inventory and the "lock-in" effect — homeowners holding sub-4% mortgages won't sell, starving the resale market and pushing some buyers to build instead on owned land. A structural tailwind.
• Household wealth and equities — custom buyers are affluent; stock-market and home-equity gains feed the segment (visible in the 2025 divergence). [8]
• Construction costs (materials and labor) — rising inputs erode affordability and push projects out; falling costs pull them forward.
• Demographics and household formation, regional migration, local zoning/permitting/utility capacity, and disaster rebuilds on already-owned lots.

Broader housing data — not direct 236115 data — confirm a rate-sensitive market. In June 2026, single-family building permits ran at an annualized 871,000 units (down 2.4% from May) and single-family starts at 895,000 (down 0.2%). [10] NAHB's single-family Housing Market Index (HMI) — a builder-sentiment gauge where 50 is the break-even line — read 35 in June 2026, below 40 for the 14th straight month, citing mortgage rates, material costs, and affordability. [11]

7. Regulation

There is no single federal regulator; the binding rules are state and local.

• Contractor licensing varies enormously by state. California requires a state license for jobs over $1,000; Michigan for residential work of $600+; Texas has no statewide general-contractor license (local rules only); some states only require registration, and many separate residential from commercial classifications. [23]
• Building permits, codes, and inspections are issued and enforced locally, typically on the International Residential Code (IRC) plus state energy codes. [23]
• Zoning, land use, impact fees, mechanic's-lien statutes, owner-builder laws (which let homeowners act as their own GC — a partial substitute for hiring a 236115 firm), and consumer-protection/warranty laws all bear on each project.

Federal overlays that still reach the job site:

• EPA stormwater permitting. The Environmental Protection Agency's (EPA) National Pollutant Discharge Elimination System (NPDES) construction-stormwater program generally applies to sites disturbing at least one acre (or smaller sites within a larger common plan). [24]
• OSHA safety rules. Occupational Safety and Health Administration (OSHA) requirements — fall protection, electrical safety, silica exposure, subcontractor oversight. [25]
• HUD fair-housing law. The Department of Housing and Urban Development's (HUD) Fair Housing Act bars discrimination in housing sales, rentals, and financing; federal mortgage-program rules apply when homes use government-backed financing. [26]

Regulation is a real cost line: NAHB estimates federal, state, and local regulation adds $131,734 to a typical new single-family home — 26.4% of an average $499,500 sales price (January 2026). That is an industry-association estimate for new-home construction broadly, not a federal 236115 figure. [27] Trade and immigration policy also hit the industry through input costs and labor supply — see Risks.

8. Competitive dynamics and consolidation

This is one of the most fragmented industries in the U.S. economy, and the federal concentration data make it vivid. Concentration ratios (CRn) show the combined revenue share of the top n firms; the Herfindahl-Hirschman Index (HHI) sums squared market shares on a 0–10,000 scale:

An HHI of ~15 (against a 10,000 ceiling) signals near-perfect competition — the 50 largest firms together hold barely an eighth of the market. [5] Competition is intensely local, because land, permits, building practices, weather, labor pools, utility rules, and customer preferences all vary by market. Builders compete on reputation, referrals, subcontractor relationships, design quality, difficult-site know-how, and reliability — not national scale.

Scale, where it helps, shows up in material purchasing, trade scheduling, permit/plan processing, customer acquisition, construction software, financing access, and warranty administration. Small builders counter with local relationships, customization, and faster decisions, but carry weaker purchasing power, thinner financing, owner dependence, and less capacity to absorb a warranty claim or a stalled project.

Unlike the for-sale side (236117), where public builders consolidate aggressively for land and scale, the custom side stays stubbornly fragmented. The consolidators that exist are multi-state "on-your-lot" brands (Schumacher, America's Home Place, Adair) and cost-plus franchises (Alair) that give local operators purchasing power, systems, and a brand — a thin layer over a sea of independents. [17] The likely consolidation path is regional platform roll-ups sharing back-office, purchasing, financing, and lead generation — not a single national production model. That is an investment judgment grounded in the low reported concentration and local operating structure. [5]

9. Risks

• Cyclicality. New construction is among the most cyclical activities in the economy; rate spikes, recessions, and confidence shocks cut demand fast, and thinly capitalized builders fail in downturns.
• Fixed-price cost overruns. A lump-sum contract signed today can be built at a loss if materials or labor jump — a 4% labor spike can consume nearly a full point of a 15% gross margin. [29]
• Labor shortage. The skilled-trades gap is structural and aging; the Home Builders Institute estimates the need at roughly 349,000 net new construction workers in 2026 just to hold equilibrium. [30]
• Tariffs and material prices. Softwood-lumber and derivative tariffs have added an estimated ~$10,000 to the cost of a home, with lumber up ~15% year-on-year; contractors report canceled or scaled-back projects. [29]
• Financing dependence and cancellations. Client construction-loan availability and rates gate starts; a failed customer loan can kill a signed job.
• Site, warranty, and liability exposure — difficult soils, weather, natural disasters, construction defects, warranty claims, and dependence on subcontractor quality and availability.
• Permitting and zoning delays that stretch cycle times and carry costs.
• Small-business fragility — undercapitalization, draw-timing cash-flow risk, customer concentration in a small builder, and surety-bond constraints, across a mostly sub-$5-million-revenue field. [5]
• Public-market misclassification — a production-builder stock bought for "custom-home exposure" may have little direct 236115 activity; the listed proxies track the broad housing cycle, not this niche. [14]

10. How to invest and the outlook

Public routes (indirect). No listed pure-play exists, so a public investor buys the theme, not the industry:

• Closest partial references: Dream Finders (DFH) and Hovnanian (HOV), which disclose build-on-your-lot / customer-controlled-land contracts — imperfect, since neither breaks out 236115. [12][13]
• For-sale production builders (236117): D.R. Horton (DHI), Lennar (LEN), PulteGroup (PHM), NVR (NVR), plus Meritage (MTH) and Century Communities (CCS), for broad single-family exposure; Toll Brothers (TOL) is the closest luxury build-to-order analog, though it sells rather than contract-builds. [14][16]
• Building-products suppliers: Builders FirstSource (BLDR), Masco (MAS), Owens Corning (OC) — capture spend from custom and production builders alike. [19]
• ETFs: ITB and XHB bundle builders, materials, and home-improvement retail. [18][19]

For public-stock analysis, emphasize normalized, through-cycle economics: price-to-earnings (P/E), price-to-book (P/B), enterprise value to EBITDA (earnings before interest, taxes, depreciation, and amortization), net debt, inventory, cash conversion, gross margin, warranty reserves, and return on invested capital. A low P/E can mislead near a cyclical earnings peak.

Private routes (direct — where the actual industry is). Owning or operating a custom-building company; funding a regional "on-your-lot" builder; taking a cost-plus franchise (e.g., Alair) for systems and brand; or investing upstream in lots, land, and local materials/lumber businesses. This is a working-owner, main-street industry — returns come from operating skill, backlog discipline, and cost control, not a stock quote. Diligence should underwrite each job and market: contract type, deposit/draw terms, fixed-price exposure, change-order history, backlog quality, work-in-progress, customer financing, permits, insurance, warranty reserves, subcontractor depth, owner dependence, and liquidity.

Near-term outlook (as of mid-2026). NAHB expects mortgage rates to hold slightly above 6% through 2026, drifting lower on projected Fed cuts, with sustained sub-6% unlikely before 2027, and only slim single-family construction growth in 2026 against affordability, labor, and tariff headwinds. [28] Builder sentiment sits below break-even (HMI 35) and monthly single-family permits/starts are running near 0.87–0.90 million annualized. [10][11] Within that soft backdrop, custom/contract building has been a relative bright spot — it expanded its share as spec building retreated in 2025, buoyed by cash-rich, land-owning, wealthier clients. [8] The structural case (chronic housing undersupply, the resale lock-in effect keeping existing homes off the market, Sun Belt/exurban land ownership) supports build-to-order demand even while the broad cycle stays subdued. The counterweights — cost inflation, tariffs, and the deepening skilled-labor shortage — press hardest on this industry's thin, volatile margins. Land-light builders with disciplined contracts, strong local trade networks, low leverage, and fast cash conversion should weather it best.

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Sources

1. U.S. Census Bureau. "2022 NAICS Definition — 236115 New Single-Family Housing Construction (except For-Sale Builders)" (scope, inclusions, exclusions incl. 236116/236118/237210/238/531110/manufacturing). 2022. https://www.census.gov/naics/?details=236115&input=236115&year=2022
2. U.S. Census Bureau. "2022 NAICS Definition — 236117 New Housing For-Sale Builders." 2022. https://www.census.gov/naics/?details=236117&input=236117&year=2022
3. U.S. Census Bureau. "Construction: Summary Statistics for the U.S., 2022" (firm vs. establishment structure). 2024. https://data.census.gov/table/ECNBASIC2022.EC2223BASIC
4. U.S. Census Bureau. "County Business Patterns, 2023 — NAICS 236115" (establishments 60,635; employees 236,076; annual payroll $15.3B; Q1 payroll $3.5B; employer-only coverage). 2023. https://www.census.gov/programs-surveys/cbp.html
5. U.S. Census Bureau. "2022 Economic Census — Concentration and Receipts, NAICS 236115" (receipts $117.8B; 54,266 firms; CR4 6.5%, CR8 8.3%, CR20 10.4%, CR50 13.7%, HHI 14.5). 2022. https://www.census.gov/programs-surveys/economic-census.html
6. U.S. Small Business Administration. "Table of Size Standards — NAICS 236115 ($45 million average annual receipts)." 2023. https://www.sba.gov/document/support-table-size-standards
7. U.S. Census Bureau. "Nonemployer Statistics — Construction" (millions of nonemployer establishments industry-wide; ~92% sole proprietors; receipts threshold $1). 2024. https://www.census.gov/newsroom/press-releases/2024/2022-nonemployer-statistics.html
8. National Association of Home Builders / Eye On Housing. "Custom Home Building Expanded in 2025" (186,000 custom starts, +3%; ~20% of single-family starts). March 2026. https://eyeonhousing.org/2026/03/custom-home-building-expanded-in-2025/
9. National Association of Home Builders / Eye On Housing. "Overall Housing Starts Inch Lower in 2025" (single-family starts 943,000, –6.9%). Feb. 2026. https://eyeonhousing.org/2026/02/overall-housing-starts-inch-lower-in-2025/
10. U.S. Census Bureau. "Monthly New Residential Construction, June 2026" (single-family permits 871,000 annualized, –2.4% m/m; single-family starts 895,000, –0.2%). 2026. https://www.census.gov/construction/nrc/current/
11. National Association of Home Builders. "Builder Sentiment Remains Weak Amid Affordability Concerns" (single-family HMI 35 in June 2026; below 40 for 14 straight months). June 2026. https://www.nahb.org/news-and-economics/press-releases/2026/06/builder-sentiment-remains-weak-amid-affordability-concerns
12. U.S. Securities and Exchange Commission. "Dream Finders Homes (DFH) 2025 Form 10-K" (customer-controlled-land GC contracts; bank/customer/builder draw schedule; over-time revenue recognition). 2026. https://www.sec.gov/Archives/edgar/data/1825088/000162828026010837/dfh-20251231.htm
13. U.S. Securities and Exchange Commission. "Hovnanian Enterprises (HOV) 2025 Form 10-K" and Build-on-Your-Lot subsidiary exhibit. 2025. https://www.sec.gov/Archives/edgar/data/357294/000175392625001938/hov-20251031.htm
14. U.S. Securities and Exchange Commission. Selected 2025 Form 10-K filings — D.R. Horton (DHI), Lennar (LEN), PulteGroup (PHM), NVR (NVR), Meritage Homes (MTH), Century Communities (CCS) (for-sale/236117 classification; land, financing, labor, cycle-time, warranty risk factors). 2026. https://www.sec.gov/cgi-bin/browse-edgar?action=getcompany&type=10-K
15. Toll Brothers. "Frequently Asked Questions" (heavy personalization offered; not currently building on privately owned land). 2026. https://www.tollbrothers.com/faq
16. Statista. "Largest U.S. home builders 2024, by revenue" (D.R. Horton $33.83B; Lennar $35.44B; PulteGroup ~$18.0B; Toll Brothers $10.6B / 10,813 homes). 2024. https://www.statista.com/statistics/199304/leading-us-homebuilding-companies-based-on-revenue/
17. Company websites — Schumacher Homes, America's Home Place, Adair Homes, Alair Homes, Drees/Elevate, United Built Homes, AR Homes, David Weekley Homes, Design Tech Homes (custom / build-on-your-land models; "on-your-lot" brands and cost-plus franchise). 2024–2026. https://www.schumacherhomes.com/; https://www.americashomeplace.com/; https://www.adairhomes.com/; https://www.alairhomes.com/
18. BlackRock iShares. "iShares U.S. Home Construction ETF (ITB)" (~46 holdings; builders, materials, retail). 2026. https://www.ishares.com/us/products/239512/ishares-us-home-construction-etf
19. State Street. "SPDR S&P Homebuilders ETF (XHB) — holdings" (~35 roughly equal-weighted; Builders FirstSource NYSE: BLDR, Masco: MAS, Owens Corning: OC). 2026. https://www.ssga.com/us/en/intermediary/etfs/state-street-spdr-sp-homebuilders-etf-xhb
20. Buildwise / Projul. "Cost-Plus vs. Fixed-Price in Residential Construction" (percentage-of-completion, draw schedules, ~15–25% markup, gross-margin targets). 2025. https://www.buildwiseapp.com/construction-finance-blog/cost-plus-vs-fixed-price-construction
21. National Association of Home Builders. "2025 Cost of Doing Business Study" (average single-family builder net margin 8.7% in 2023; top quartile 17.7%; bottom quartile –1.4%). 2025. https://www.nahb.org/
22. U.S. Bureau of Labor Statistics. "Producer Price Index (PPI)" and "Employment Cost Index (ECI)" (construction-input and labor-cost indicators; not 236115-specific). 2026. https://www.bls.gov/ppi/; https://www.bls.gov/eci/home.htm
23. Procore / NEXT Insurance. "General Contractor License Requirements by State (2026)" (CA $1,000 threshold; MI $600; TX no statewide GC license; local permits; IRC). 2026. https://www.procore.com/library/contractors-license-guide-all-states
24. U.S. Environmental Protection Agency. "Stormwater Discharges from Construction Activities (NPDES)" (permit generally applies at ≥1 disturbed acre, or smaller sites in a common plan). 2026. https://www.epa.gov/npdes/stormwater-discharges-construction-activities
25. U.S. Occupational Safety and Health Administration. "Fall Protection in Residential Construction" (fall protection, electrical, silica, subcontractor oversight). 2026. https://www.osha.gov/residential-fall-protection/guidance
26. U.S. Department of Housing and Urban Development. "Housing Discrimination Under the Fair Housing Act." 2026. https://www.hud.gov/helping-americans/fair-housing-act-overview
27. National Association of Home Builders. "Regulatory Costs Add $131,734 to New Home Prices" (26.4% of an average $499,500 sales price; industry-wide estimate, not 236115-specific). June 2026. https://www.nahb.org/news-and-economics/press-releases/2026/06/regulatory-costs-jump-40-in-five-years-add-131734-to-new-home-prices
28. National Association of Home Builders. "2026 Housing Outlook: Ongoing Challenges, Cautious Optimism" (mortgage rates slightly above 6% through 2026; sub-6% unlikely before 2027; slim single-family growth). Feb. 2026. https://www.nahb.org/news-and-economics/press-releases/2026/02/2026-housing-outlook-ongoing-challenges-cautious-optimism-and-incremental-gains
29. HousingWire / NAHB. "Commodity price volatility hits homebuilders as tariffs reshape costs" (softwood-lumber tariffs ~$10,000 added per home; lumber +15% YoY; margin sensitivity to labor). 2025. https://www.housingwire.com/articles/builder-material-costs-tariffs/
30. Home Builders Institute. "Construction Labor Market Report, Fall 2025" (~349,000 net new construction workers needed in 2026). Oct. 2025. https://hbi.org/wp-content/uploads/2025/10/Fall-2025-Final-Construction-Labor-Market-Report-Update.pdf