Residential Building Construction (United States) — NAICS 23611

A Histometrics rollup primer for public- and private-market investors. This level synthesizes the four child industries — custom single-family, rental multifamily, for-sale builders, and remodelers — against our ground-truth federal statistics for the group.

1. Overview

The North American Industry Classification System (NAICS) — the U.S. government's standard scheme for grouping businesses by activity — uses code 23611 for Residential Building Construction: the general contractors and builders who put up, sell, and renovate American homes. It is the largest slice of the residential construction subsector, and it rolls up four very different businesses that happen to share a job site. [1]

The single most useful thing to understand about this level is that "residential building" is not one industry — it is four, sorted by who owns the risk and what the firm actually sells:

• New single-family, built to order (NAICS 236115) — a contractor builds a house for a customer, usually on land the customer already owns. [3]
• New rental multifamily (NAICS 236116) — apartment buildings built to be leased, not sold unit-by-unit. [4]
• New for-sale housing (NAICS 236117) — "merchant" or "spec" builders who own the land, carry the home as inventory, and sell the finished house with the lot included. This is where the big public homebuilders live. [5]
• Residential remodelers (NAICS 236118) — general contractors who renovate, add on to, repair, and rebuild existing homes. [6]

Those four are worth as much as $601.4 billion in combined receipts and employ about 905,000 people across some 204,000 firms. [2] But they differ on nearly every axis an investor cares about — size, growth direction, capital intensity, concentration, who owns them, and how you buy in. The rest of this primer leads with that contrast, then treats the group as a whole.

• Public-market way in: deep in one child (for-sale builders — more than a dozen listed homebuilders), essentially absent in the other three, where public exposure is only indirect (building-products suppliers, big-box retailers, apartment landlords, and fund managers). See Section 4.
• Private-market way in: this is where three of the four children actually live — owner-operated custom builders, apartment developers and their capital stack, and small local remodelers plus the private-equity roll-ups now consolidating them.

2. What's inside — the four child industries and how they differ

All four are general-contractor/builder codes: they capture the firm that orchestrates a project — land, capital, permits, design, and subcontractor crews — while most of the hammer-swinging labor (framing, plumbing, electrical, roofing) is performed by specialty trade contractors classified separately in NAICS Subsector 238. [3][4][5][6] What separates the children is the business model wrapped around that orchestration.

Four contrasts do the analytical work at this level:

(1) Revenue is concentrated where firms are scarce, and vice-versa. For-sale builders are 46% of the money but only 9% of the firms; remodelers are the mirror image — 21% of the money but 63% of the firms. A typical for-sale builder books roughly $15 million in receipts; a typical remodeler about $1 million, and a typical custom single-family builder about $2 million. [3][5][6][7] Rental-multifamily firms are the fewest (under 4,000) but the largest on average, near $20 million each. [4][7]

(2) The four book revenue on completely different bases, which is why "revenue per employee" swings wildly — from about $270,000 at a remodeler (labor-heavy relative to booked revenue), to roughly $500,000 at a custom builder, up to $1.4 million at a multifamily contractor, and about $2.1 million at a for-sale builder (whose books carry the land and finished home, not just the construction fee, while the trades sit off the payroll). [3][4][5][6] A high figure signals more value orchestrated per employee, not more productive labor.

(3) They sit at opposite ends of the capital-intensity spectrum. For-sale builders own land and inventory and live or die by home prices and balance-sheet discipline — capital-intensive and highly cyclical. [5] The other three are far more fee-and-service businesses: custom builders and remodelers build on someone else's dime, and even apartment contractors (as opposed to the developers who fund them) carry little inventory. [3][4][6]

(4) Growth is diverging right now. Remodeling is the steady anchor; custom single-family has been the cyclical bright spot; for-sale and rental multifamily are both working through a rate-driven slowdown (Section 6). [4][5][6][23]

3. How big it is

Our ground-truth federal statistics for the whole group, NAICS 23611. These figures mix two Census programs and two years — the 2022 Economic Census and 2023 County Business Patterns — so they are not a single-year operating snapshot. [2]

The children reconcile almost exactly to these totals — receipts, establishments, employment, and payroll each sum to the group figure — so the rollup is clean rather than estimated. [2][3][4][5][6] The Small Business Administration's (SBA) $45 million threshold is a government eligibility line, not a typical-firm size; against average firm receipts near $3 million, virtually the entire group qualifies as a small business. [9]

Concentration is very low, but it is an average of two different worlds. The group HHI of 54.3 (against a 10,000 monopoly ceiling) signals near-perfect competition. But that single number hides a wide spread across the children: for-sale builders are the most concentrated (HHI ~249, CR4 ~24.6%), while remodelers are among the least concentrated industries in the entire economy (HHI ~1.9, CR4 ~1.9%); custom single-family (HHI ~14.5) and rental multifamily (HHI ~22.8) sit in between. [3][4][5][6] Read the group figure as "residential construction is fragmented on average," not "every corner of it is." Competition is intensely local in all four, because land, permits, codes, weather, labor pools, and buyer preferences reset in every market. [5]

The undercount caveat — large here. County Business Patterns (CBP) counts only employer establishments. Residential construction is thick with nonemployer businesses — self-employed contractors and one-person remodelers who subcontract every trade and carry no payroll. The Census Bureau's separate Nonemployer Statistics program counts construction nonemployers in the millions industry-wide (the great majority sole proprietors). [10] So the true population of firms building and renovating homes is far larger than the ~212,000 employer establishments here, and the receipts total understates total activity — heavily in the remodeling and custom-single-family children, where small operators dominate. A second undercount runs the other way: because the labor is subcontracted to NAICS 238 trades and (for apartments) the developer/owner function sits in real estate (NAICS 531), the $601 billion of builder-firm receipts is smaller than the total economic value of the homes built and renovated. Total home-improvement-and-repair spending alone runs $500–600 billion a year, and new multifamily construction spending runs near $125 billion, both larger than their respective child-code receipts. [6][4][13] Treat $601 billion as "revenue booked by residential building-contractor firms," not "the value of all housing built."

4. The investable universe — where value concentrates across the children

The defining feature of this level for public investors: all of the tradeable depth sits in one child. For-sale builders (236117) offer one of the deepest, most liquid rosters in construction; the other three children have essentially no pure-play public company, so public exposure to them is indirect — through suppliers, retailers, landlords, and fund managers that also touch the rest of the housing economy. Private-market investors face the reverse: the direct, operating industry is overwhelmingly in the three "no pure-play" children. Tickers below are representative proxies, not a NAICS-verified roster; scale figures are approximate and change.

A REIT (Real Estate Investment Trust) is a company that owns income-producing real estate and passes most of its income to shareholders; apartment REITs are landlords first but run development pipelines, making them the closest public proxy for new rental construction. [4] An ETF (exchange-traded fund) bundles a theme in one ticket but is not pure builder exposure. [21]

Where the actual businesses are (private). For-sale building also has a huge private and foreign-owned tier (Japan's Sekisui House, Daiwa House, and Sumitomo Forestry own major U.S. builders; David Weekley, Perry Homes, and Shea Homes are family-owned). [5] Rental multifamily is almost entirely private — vertically integrated platforms (Greystar, Wood Partners, Dominium) and pure fee builders (Summit Contracting Group). [4][14] Custom single-family is a main-street industry of ~54,000 small builders with a thin brand/franchise layer (Schumacher, America's Home Place, Alair). [3] Remodeling is ~128,000 employer firms plus a long nonemployer tail, now topped by a fast-growing private-equity (PE) roll-up tier (Renuity, Power Home Remodeling, West Shore Home). [6]

5. How the money works

One code, four distinct profit models — the reason a single set of margin benchmarks does not describe this level:

• Custom single-family (236115): a fee for building someone else's house. Revenue is recognized over the life of each contract (percentage-of-completion) against progress "draws." Pricing is either cost-plus (actual costs plus a ~15–25% markup, overruns pass to the client) or fixed-price (one number, higher built-in margin, but the builder eats an overrun). Little inventory, low capital intensity; the average single-family builder ran an 8.7% net margin in 2023, with the bottom quarter losing money. [3][12]

• Rental multifamily (236116): two models under one roof. Fee builders earn a thin single-digit construction fee (construction net margins run ~6–7%). Merchant developers earn a "build-to-a-yield spread" — they underwrite a project to a stabilized yield-on-cost (expected net operating income, or NOI, divided by total development cost) and profit when that yield beats the market cap rate at which the finished building trades. Build to a 6% yield and sell at a 5% cap rate, and the spread is the developer's margin — the fattest in the chain, and the first thing a rate spike erases. Affordable projects lean on the Low-Income Housing Tax Credit (LIHTC). [4][17]

• For-sale builders (236117): a gain on selling owned inventory. The cash cycle is front-loaded — spend on land, lots, and models long before revenue is recognized at closing. The levers are gross margin per home (running ~20–25% and compressing as builders discount), the owned-versus-optioned land model (the "land-light" option model now dominates), and captive-mortgage rate buydowns used in place of price cuts. Capital-intensive and operating-leveraged to volume. [5]

• Remodelers (236118): project-based labor-and-materials. Cost of sales runs ~70% of revenue, gross margin in the mid-20s%, net margin thin and cyclical (~4.7% long-run; an unusually strong 6.3% in 2024). The big replacement firms (windows, baths, roofing) are really sales-and-marketing machines that live on lead cost and close rate; the PE roll-up thesis is "multiple arbitrage" — buy small firms cheap, centralize back-office, re-rate the platform. [6]

What unites all four: thin, cyclical margins; volume as the primary margin lever (fixed overhead eats profit when starts fall); and working-capital timing — floating subcontractor and material costs between draws or closings — that sinks undercapitalized firms even in profitable years. [3][5][6] No margin index is published at the 23611 level; the Bureau of Labor Statistics' construction-input Producer Price Index and labor Employment Cost Index are the usable gauges of margin pressure. [3]

6. What drives demand

All four children answer to the same master variables, but with different sensitivity:

• Mortgage and interest rates — the dominant driver. Rates set affordability for buyers, construction-loan cost and exit cap rates for apartment developers, and financed-project affordability for big remodels. For-sale and rental multifamily are the most rate-sensitive; custom single-family (affluent, cash-and-construction-loan buyers) and remodeling are steadier. As of mid-2026 the 30-year fixed sat near 6.5%, and the NAHB/Wells Fargo Housing Market Index (HMI, a builder-confidence gauge where 50 is neutral) had fallen to the mid-30s. [5][11]
• The mortgage "lock-in" effect — a shared tailwind. With most outstanding mortgages below 6%, owners won't sell and lose their cheap loan. That freezes resale inventory, which pushes buyers toward new homes (helping for-sale builders) and pushes stay-put owners to renovate instead of move (helping remodelers). [5][6]
• A structural housing shortage. Estimates of the U.S. shortfall range from roughly 3.7 million to 4.9 million units — the long-run demand floor under new construction of every type. [4][5]
• Aging housing stock (remodeling-specific). The median U.S. home is now over 40 years old, a compounding tailwind unique to the remodeling child. [6]
• Demographics, migration, and household wealth. Millennial/Gen-Z household formation and Sun Belt in-migration concentrate new-build demand; equity-market and home-equity gains feed the affluent custom and high-end remodeling segments. [3][5]
• Construction costs (materials and labor). Rising inputs and tariffs erode affordability and shelve projects across all four (Section 9).

The current divergence (2025–2026): custom single-family expanded its share (~+3% custom starts) as speculative building pulled back; for-sale single-family starts cooled toward a ~895,000 annual rate; rental-multifamily starts are absorbing a record supply wave with vacancies at multi-decade highs; and remodeling grinds slowly positive (Harvard's Leading Indicator of Remodeling Activity, LIRA, points to ~0.5% growth toward ~$523 billion by early 2027). [4][5][6][11][23]

7. Regulation

There is no single federal regulator; the binding rules for all four children are state and local — zoning, land use, density and permitting, building and energy codes, contractor licensing (which varies enormously by state), impact fees, mechanic's-lien and consumer-protection/warranty law. Local zoning and entitlement is the single biggest swing factor on whether — and how much — housing gets built. [3][4][5][6]

Federal overlays that reach the job site, some shared and some child-specific:

• Shared: EPA construction-stormwater permitting under the National Pollutant Discharge Elimination System (NPDES), generally at sites disturbing ≥1 acre; OSHA safety rules (fall protection, silica); and the HUD Fair Housing Act barring discrimination in housing. [3][22]
• Remodeling-specific: the EPA Renovation, Repair and Painting (RRP) Rule requires lead-safe certification for disturbing paint in pre-1978 homes — touching a large share of remodeling jobs given the age of the stock. [6][22]
• Multifamily-specific: LIHTC (run by state agencies), Davis-Bacon prevailing-wage rules on federally assisted projects, and FHA mortgage insurance (Section 221(d)(4)) for new construction. [4][17]
• For-sale-specific: RESPA/Regulation X governs the captive mortgage/title arms most large builders own. [5]

Regulation is a real cost line: NAHB estimates federal, state, and local regulation adds about $131,734 — 26.4% — to the price of a typical new single-family home (an industry-association estimate for new construction, not a federal 23611 figure). Trade and immigration policy hit all four through input costs and labor supply (Section 9). [5][18]

8. Consolidation

The four children are consolidating on different tracks and at different speeds — the group's low average concentration masks real divergence:

• For-sale builders (236117) — the most consolidated and consolidating fastest. The ten largest builders captured a record ~44.7% of new single-family closings in 2024, and in some metros the top ten exceed 90% share. Three consolidation engines run at once: foreign strategic buyers (Sekisui, Daiwa, Sumitomo), private equity (Apollo-backed New Home Co.), and public M&A (a reported Berkshire Hathaway bid for Taylor Morrison; Dream Finders' bid for Beazer). [5][16]
• Rental multifamily (236116) — consolidating vertically, not horizontally. Large platforms (Greystar the archetype) combine development, construction, property management, and investment management rather than buying rivals. The most visible horizontal move is on the ownership side — the pending AvalonBay–Equity Residential merger of equals would create a landlord with 180,000+ apartments and a ~$69 billion enterprise value. [4][15]
• Remodelers (236118) — fragmentation so deep that roll-ups barely dent it. PE has aggressively rolled up the exterior/replacement niches, but the bigger money — and the more durable economics — is one layer up in the supply chain: QXO's ~$11B Beacon and ~$17B TopBuild deals, and Home Depot's and Lowe's distribution acquisitions, all chasing the ~$800 billion building-products market. One major remodeling roll-up (Renovo) collapsed into bankruptcy in 2025 — a reminder the model is not risk-free. [6][24]
• Custom single-family (236115) — stubbornly fragmented. The only consolidators are multi-state "on-your-lot" brands and cost-plus franchises — a thin layer over a sea of independents. [3]

The pattern across the level: scale compounds where land, capital, and marketing dominate the economics (for-sale building, replacement remodeling, apartment ownership), and stays elusive where the work is bespoke and locally relationship-driven (custom homes, general remodeling). National scale never eliminates local competition, because permits, labor, and codes reset in every market. [5][6]

9. Risks

• Cyclicality and rate risk. Residential construction is among the most cyclical activities in the economy; for-sale builders and merchant apartment developers are hit hardest, but no child is immune. Thinly capitalized firms fail in downturns. [5]
• Cost inflation and tariffs. Softwood-lumber and derivative tariffs have added an estimated ~$10,900 to the cost of a home; steel/aluminum tariffs lift remodeling and mid-rise apartment costs. Fixed-price contracts signed today can be built at a loss. [5][6][20]
• Skilled-labor shortage. Structural and aging; the Home Builders Institute estimates a need for roughly 349,000 net new construction workers in 2026 just to hold equilibrium — a constraint on all four children. [3]
• Thin, volatile margins. Net margins run mid-single-digit across custom (~8.7%), remodeling (~4.7%), and multifamily contracting (~6–7%); a single mispriced job, schedule slip, or subcontractor default can erase a builder's profit. [3][4][6]
• Financing and inventory risk. For-sale builders carry land and inventory exposure (the 2008 killer); apartment developers depend on the yield-to-cap-rate spread; custom builders and remodelers depend on client construction and consumer-financing availability. [4][5]
• Roll-up and leverage risk. PE consolidation in remodeling and homebuilding adds execution and leverage risk (see Renovo's 2025 bankruptcy). [6]
• Public-market proxy risk. Outside for-sale builders, the listed names track the broad housing cycle or unrelated end-markets, not the specific child an investor may be targeting. [3][6]
• Small-business fragility and measurement risk. A mostly sub-$5-million-revenue field with draw-timing cash-flow risk; and federal employer statistics omit a large nonemployer tail, so top-down sizing is approximate. [2][10]

10. How to invest and the outlook

Public routes. The only child with genuine public depth is for-sale builders — the mega-caps (DHI, LEN, PHM) for scale, NVR for its capital-light high-return model, TOL for luxury, and mid-caps for growth/beta. For the other three children, buy the theme: apartment REITs (AVB, EQR, MAA, CPT) for rental multifamily; retail and building-products names (HD, LOW, MAS, IBP, BLDR) for remodeling; and cross-cutting suppliers and ETFs (BLDR, OC, ITB, XHB) for total construction volume. Value builders on price-to-book and normalized, through-cycle earnings — not a single-year price-to-earnings ratio, which misleads near a cyclical peak — watching order growth, incentive load, gross margin after incentives, SG&A (selling, general and administrative) leverage, land-option coverage, and return on invested capital (ROIC). [5][21]

Private routes — where three of the four children actually are. Owning or operating a custom-building or remodeling business; taking a cost-plus franchise or backing a regional roll-up; acting as an apartment developer, general partner (GP) sponsor, or limited partner (LP) equity, or providing construction/mezzanine lending and LIHTC tax-credit equity. Returns come from operating skill, backlog discipline, and cost control. Diligence should underwrite contract type, backlog quality, work-in-progress, financing, permits, warranty reserves, subcontractor depth, owner dependence, and liquidity. [3][4][6]

Near-term outlook (mid-2026). The whole level is rate-gated and margin-pressured, but the four children are out of phase. For-sale building is low-volume and discounting, with the biggest builders still taking share. Rental multifamily is mid-correction, absorbing a record supply wave with vacancies near multi-decade highs — today's under-building is seeding the next crunch. Custom single-family has been a relative bright spot, buoyed by cash-rich, land-owning clients. Remodeling is the steady anchor, growing slowly on an aging housing stock and the lock-in effect. [4][5][6][23] The shared structural case — a multi-million-unit housing shortfall, frozen resale inventory, aging stock, and demographic demand — supports the level through the cycle; the shared counterweights — elevated rates, tariff-driven cost inflation, and a deepening labor shortage — press hardest on its thin margins. The common swing factor is mortgage rates: a decisive decline would unfreeze resale turnover and re-accelerate all four at once. Across every child, the operators best positioned are the land-light, low-leverage, disciplined ones with strong local trade networks and fast cash conversion. [5][6][11]

---

Sources

This rollup synthesizes our four child primers (236115, 236116, 236117, 236118) and our ground-truth federal statistics for NAICS 23611. Figures for the group level come from the ground-truth file; figures attributed to a child come from that child's primer and its underlying federal and industry sources.

1. U.S. Census Bureau. "2022 NAICS Definition — 23611 Residential Building Construction" (industry-group scope; four child industries 236115/236116/236117/236118). 2022. https://www.census.gov/naics/?input=23611&year=2022
2. Histometrics ground-truth federal statistics — NAICS 23611 (receipts $601.377B and firms 203,762, Economic Census 2022; establishments 212,178, employment 905,357, annual payroll $64.356B, Q1 payroll $15.649B, County Business Patterns 2023; CR4 11.4%, CR8 15.7%, CR20 24.2%, CR50 29.8%, HHI 54.3, Economic Census concentration 2022).
3. Histometrics primer — NAICS 236115, New Single-Family Housing Construction (except For-Sale Builders) (custom/contract model; receipts $117.8B, 54,266 firms; CR4 6.5%, HHI 14.5; net margin 8.7%; custom-start divergence; labor and regulatory-cost figures). 2026.
4. Histometrics primer — NAICS 236116, New Multifamily Housing Construction (except For-Sale Builders) (rental model; receipts $77.9B, 3,811 firms; CR4 5.5%, HHI 22.8; fee-builder vs. merchant-developer economics, yield-on-cost/cap-rate spread, LIHTC; ~$125B new multifamily construction spending; starts cycle and vacancy). 2026.
5. Histometrics primer — NAICS 236117, New Housing For-Sale Builders (merchant/spec model; receipts $276.6B, 18,094 firms; CR4 24.6%, HHI 248.9; land-light options, buydowns, gross-margin compression; top-10 builder share; public roster and private/foreign ownership; consolidation). 2026.
6. Histometrics primer — NAICS 236118, Residential Remodelers (renovation model; receipts $129.1B, 127,652 firms; CR4 1.9%, HHI 1.9; ~$500–600B total remodeling market; cost-of-sales/margin structure; PE roll-ups and supply-chain consolidation; aging-stock demand; RRP rule). 2026.
7. U.S. Census Bureau. "2022 Economic Census — Receipts and Concentration of Largest Firms, NAICS 236115/236116/236117/236118" (per-child receipts, firm counts, CRn, HHI). 2022. https://www.census.gov/programs-surveys/economic-census.html
8. U.S. Census Bureau. "County Business Patterns, 2023 — NAICS 236115/236116/236117/236118" (per-child employer establishments, employment, payroll). 2023. https://www.census.gov/programs-surveys/cbp.html
9. U.S. Small Business Administration. "Table of Small Business Size Standards — NAICS 2361 series ($45 million average annual receipts)." 2023. https://www.sba.gov/document/support-table-size-standards
10. U.S. Census Bureau. "Nonemployer Statistics — Construction" (millions of nonemployer establishments industry-wide; majority sole proprietors). 2024. https://www.census.gov/programs-surveys/nonemployer-statistics.html
11. National Association of Home Builders / U.S. Census Bureau & HUD. "Housing Market Index and Monthly New Residential Construction" (mid-2026 mortgage rate ~6.5%; HMI mid-30s; single-family starts ~895,000 SAAR) and "2026 Housing Outlook." 2026. https://www.nahb.org/news-and-economics
12. National Association of Home Builders. "2025 Cost of Doing Business Study" (single-family builder net margin 8.7% in 2023; bottom quartile negative). 2025. https://www.nahb.org/
13. Joint Center for Housing Studies of Harvard University. "Improving America's Housing 2025 / Leading Indicator of Remodeling Activity" (owner improvement-and-repair spending ~$500–600B a year; ~0.5% growth to ~$523B by Q1 2027). 2025–2026. https://www.jchs.harvard.edu/improving-americas-housing-2025
14. National Multifamily Housing Council. "NMHC 50 — largest apartment builders and developers, 2024" (Summit, Greystar, Dominium, Wood Partners, NRP). 2025. https://www.nmhc.org/
15. AvalonBay Communities / Equity Residential. "Merger of Equals" (combined landlord 180,000+ apartments, ~$69B enterprise value). May 2026. https://investors.avalonbay.com/
16. National Association of Home Builders / Eye on Housing. "Top Ten Builder Market Share" (record ~44.7% of 2024 closings; metro concentration >90% in 11 of top-50 metros). 2025–2026. https://eyeonhousing.org/
17. Tax Policy Center. "What is the Low-Income Housing Tax Credit and how does it work?" (LIHTC mechanics; 2025 One Big Beautiful Bill Act expansion). 2025. https://taxpolicycenter.org/briefing-book/what-low-income-housing-tax-credit-and-how-does-it-work
18. National Association of Home Builders. "Regulatory Costs Add $131,734 to New Home Prices" (26.4% of an average sales price; industry estimate, not federal 23611 data). 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
19. Home Builders Institute. "Construction Labor Market Report, Fall 2025" (~349,000 net new construction workers needed in 2026). 2025. https://hbi.org/
20. National Association of Home Builders / HousingWire. "Tariffs and building-material costs" (~$10,900 per home from tariff actions; lumber and steel/aluminum volatility). 2025. https://www.nahb.org/advocacy/top-priorities/building-materials-trade-policy/how-tariffs-impact-home-building
21. State Street / BlackRock. "SPDR S&P Homebuilders ETF (XHB)" and "iShares U.S. Home Construction ETF (ITB)" — fund composition (builders + materials + home-improvement retail). 2026. https://www.ssga.com/; https://www.ishares.com/us/products/239512/ishares-us-home-construction-etf
22. U.S. EPA, OSHA, and HUD. NPDES construction-stormwater program (≥1 disturbed acre); Renovation, Repair and Painting (RRP) lead rule for pre-1978 homes; OSHA residential fall protection; Fair Housing Act. 2026. https://www.epa.gov/npdes/stormwater-discharges-construction-activities; https://www.epa.gov/lead/renovation-repair-and-painting-program-contractors; https://www.osha.gov/residential-fall-protection; https://www.hud.gov/helping-americans/fair-housing-act-overview
23. National Association of Home Builders / Eye on Housing. "Custom Home Building Expanded in 2025" (~186,000 custom starts, +3%, ~20% of single-family starts, as speculative building retreated). March 2026. https://eyeonhousing.org/2026/03/custom-home-building-expanded-in-2025/
24. ResiClub Analytics / SEC filings. "QXO to acquire TopBuild (~$17B); Beacon Roofing (~$11B); Kodiak" and Lowe's / Home Depot distribution acquisitions (building-products supply-chain consolidation). 2025–2026. https://www.resiclubanalytics.com/