Building Inspection Services (U.S.) — NAICS 541350

An investor's primer. NAICS (the North American Industry Classification System) code 541350 covers firms whose main business is inspecting the physical condition of buildings and reporting on it — most visibly the home inspection you pay for when buying a house, plus the larger, engineering-led condition reports ordered on commercial property.

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1. Overview

When someone buys a home, a third party usually walks the property for a few hours and writes a report on the roof, foundation, wiring, plumbing, heating, and safety hazards. That service — plus its commercial cousin, the property-condition assessment ordered by investors and lenders before a building changes hands — is the core of this industry.

Why it matters to an investor: building inspection sits directly on top of real-estate transaction volume. Almost every residential inspection is triggered by a purchase, so the industry rises and falls with home sales; the commercial side tracks property acquisitions and refinancing. It is a low-capital, high-fragmentation, labor-led local-service business — tens of thousands of small operators, a handful of franchise brands, and a separate tier of engineering consultancies on the commercial side. Longer-run demand is supported by aging buildings, code complexity, insurer scrutiny, and deferred maintenance.

Public and private ways in differ sharply. There is no pure-play publicly traded home-inspection company; public-market exposure is indirect — a franchise brand buried inside a larger property-services company, an engineering firm that does outsourced code inspection, a software vendor to inspectors, or a global testing-and-inspection conglomerate. The concentrated economic action is private and small-scale: buying, building, or franchising an inspection business, or — on the commercial side — the private-equity-backed roll-ups of engineering firms. This is fundamentally a private / small-business industry, and the sections below treat it that way.

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2. What it is and how it's structured

Scope. NAICS 541350 comprises establishments primarily engaged in inspecting buildings and reporting on their physical condition — evaluating the structure and its component systems, generally for buyers, sellers, owners, or lenders in a real-estate transaction. It includes home-inspection services and building-inspection bureaus.[1] In practice there are three lanes:

• Residential home inspection — the roughly three-hour, ~$344 visual inspection tied to a home purchase (also pre-listing, maintenance, and new-construction reviews). Overwhelmingly done by solo owner-operators and franchisees.[1]
• Commercial property-condition assessment (PCA) — larger, engineering-led due-diligence reports (also facility-condition assessments, capital-needs reviews, and construction monitoring) on office, retail, industrial, and multifamily assets, usually following the ASTM International (formerly American Society for Testing and Materials) E2018 guide, ordered by buyers, lenders, private-equity firms, and real-estate investment trusts (REITs).[6]
• Privately contracted code / plan-review work — municipal plan review, code-compliance checks, and third-party field inspections that a jurisdiction outsources to private firms. Note the distinction: a government's own code inspectors are classified separately (see below), but private firms doing this work under contract fall here.

What it excludes (adjacent NAICS codes). The classification deliberately carves out several related activities:

• Inspecting buildings for termites and other pests → NAICS 561710 (Exterminating and Pest Control Services).[1]
• Inspecting buildings for hazardous materials (asbestos, lead, mold as an environmental matter) → NAICS 541620 (Environmental Consulting Services).[1]
• Real-estate appraisal (valuation, not condition) → NAICS 531320.[1]
• Construction-material testing / inspection → generally NAICS 541380.[1]
• Government building-code enforcement — the municipal inspector who signs off on permits and code compliance → NAICS 926150 (Regulation, Licensing, and Inspection of Miscellaneous Commercial Sectors).[5]

That last exclusion matters: a large share of "building inspection" in the everyday sense is done by government code officials and is not in this industry. NAICS 541350 is the private, fee-for-service inspection done for a transaction or under private contract — not the public-sector code inspector on payroll.

Ownership mix. The industry is a barbell. At one end, tens of thousands of independent sole proprietors and tiny limited-liability companies (LLCs). In the middle, national franchise brands (Pillar To Post, HouseMaster, AmeriSpec, WIN Home Inspection, HomeTeam) whose "units" are still independently owned local operators. At the other end, on the commercial side, a smaller set of engineering consultancies (Partner Engineering & Science, EBI Consulting, AEI Consultants, and the U.S. arms of global testing majors) that are increasingly private-equity-owned.[7][20] The federal data do not publish a clean public/private ownership split.

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3. How big it is

Federal statistics (our ground-truth figures):

That works out to about $598,000 in average annual receipts per firm and fewer than four employees per establishment[2][3] — the statistical signature of a very small-business industry. The U.S. Small Business Administration's (SBA) size threshold of $11.5 million[4] means essentially every firm in the industry qualifies as a small business. The supplied federal file does not include growth rates, margins, earnings before interest, taxes, depreciation and amortization (EBITDA), geographic splits, or nonemployer receipts; those are noted as absent rather than estimated.

The undercount caveat (important here). These federal figures count employer businesses — those with payroll. Home inspection is dominated by one-person shops that often operate as nonemployer sole proprietors and never show up in County Business Patterns (CBP) or the Economic Census employer tables. The trade body InterNACHI (International Association of Certified Home Inspectors) alone reports more than 27,000 members, and industry estimates put the number of practicing U.S. inspectors around 25,000-plus[9] — well above the 28,755 payroll employees[2] at employer firms. So the federal data undercounts the number of people doing this work and understates total industry revenue. The federal receipts figure (~$4.46 billion) is best read as the employer core of a somewhat larger whole; the research firm IBISWorld estimated total U.S. building-inspection revenue near $5.0 billion in 2025, down about 4% on the year as home sales slumped.[8]

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4. The investable universe

There is no pure-play public home-inspection stock. For public-market investors this is the headline fact: you cannot buy "the home-inspection industry" as a listed security. The closest exposures are diluted, and each carries substantial unrelated end-market exposure:

The TIC majors (a "TIC" firm sells testing, inspection, and certification) give broad inspection exposure but are non-U.S.-listed and not concentrated in the U.S. building-inspection niche.

Major private and franchise owners (where the industry actually consolidates):

Bottom line: public investors get, at best, thin indirect exposure. The genuine ownership opportunities are private — franchises, independent firms, PE roll-ups of residential operators, and commercial PCA consultancies.

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5. How the money works

The residential inspector's economics are simple and worth understanding because they explain the whole industry structure.

Revenue = inspections completed × average fee + add-ons. The core fee for a standard single-family home averages about $344, typically $296–$424 depending on home size and market (higher in the Northeast, lower in the Midwest).[21] On top of the base inspection, inspectors sell ancillary services at extra cost — radon testing, mold sampling, sewer-line scoping, thermal-imaging scans, water-quality tests, and (in some states) wood-destroying-organism (WDO) or wind-mitigation checks. Add-ons are the margin lever: they raise the ticket without proportionally raising time on site.

Cost structure is light. No inventory, minimal fixed assets — a vehicle, tools, a laptop, and inspection software. The recurring costs are errors-and-omissions (E&O) and general-liability (GL) insurance, licensing and continuing education, marketing, and software subscriptions. A solo inspector keeps most of each fee. Because there is no capital moat, the binding constraint on income is simply inspection volume — how many jobs the inspector can book and physically complete per week.

The key operating metrics:

• Job volume / inspections per week — the single most important number; it tracks local home-sale activity almost one-for-one.
• Average ticket (base fee plus add-on attach rate).
• Agent-referral flow. Most residential jobs come from real-estate agents recommending an inspector to their buyer. Referral relationships are the primary customer-acquisition channel — a structural feature (and a criticized one; see Risks).
• Utilization. A solo inspector's revenue ceiling is bounded by daylight hours and travel time; scaling means hiring W-2 inspectors (a "multi-inspector firm").

Owner income tracks volume: self-employed inspectors' net earnings range widely, roughly from the $50,000s for part-timers up into the six figures for busy multi-inspector operators.[22] (Treat these as estimates — self-employed income is revenue minus expenses, not a salary.)

The franchise model. Brands like Pillar To Post, AmeriSpec, and WIN sell a startup package: an all-in cost commonly in the ~$40,000–$60,000 range plus an ongoing ~7% royalty on gross revenue, in exchange for brand, training, software, and national-account referral programs.[7] The trade is classic franchising — the operator gives up a slice of every fee to lower the cost of getting started and finding customers.

The commercial side works differently: fewer, larger jobs at much higher fees, sold to institutional buyers and lenders, delivered by salaried engineers and staffed like a consultancy. Revenue tracks commercial-real-estate (CRE) transaction and refinancing volume rather than home sales, and the relevant metrics shift to revenue per assignment, billable utilization, backlog, repeat lender/REIT relationships, and claims history.

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6. What drives demand

• Existing-home sales volume — the dominant driver. Because most residential inspections are purchase-triggered, transaction count is the master variable. U.S. existing-home sales ran near a 30-year low in 2025 (about 4.06 million, with the annualized rate ending the year around 4.35 million as rates eased),[23] which is exactly why the industry's revenue fell in 2025.[8] A recovery in transactions is the biggest single upside for residential inspectors.
• Mortgage rates and affordability. Rates drive transaction volume; rates easing from ~7% toward ~6% through 2025 began to thaw sales late in the year.[23]
• Market temperature and inspection waivers. In red-hot seller's markets buyers waive inspections to win bids. The National Association of Realtors (NAR) began tracking this in April 2021 at 25% of buyers waiving, peaking near 30% in mid-2022, then falling back toward ~18% as the market cooled.[24] Waivers are a direct demand headwind that has since receded.
• Aging housing stock. Harvard's Joint Center for Housing Studies (JCHS) reported the median age of an owner-occupied U.S. home reached 42 years in 2023 — older homes mean more roofs, wiring, plumbing, moisture, and deferred maintenance to find, and more reason to inspect.[29]
• New construction and renovation. New-build and phased-construction inspections, plus more complex building systems, energy-efficiency requirements, and resilience standards, all generate inspection, testing, and commissioning work.
• Commercial/institutional underwriting. CRE deal and lending volume drives PCA demand; a growing overlay is energy-efficiency and climate-resilience ("green") assessments bolted onto traditional condition reports.[20][31]
• Insurance and disasters. Insurers increasingly require roof-condition and property data; some markets — Florida especially — mandate four-point and wind-mitigation inspections for coverage. Post-disaster inspections (e.g., FEMA, the Federal Emergency Management Agency) add non-transaction demand.[30]

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7. Regulation

There is no federal license for home inspectors. Regulation is state-by-state and uneven: roughly 35 states license or otherwise regulate home inspectors, while about 15 have no licensing requirement at all — including, notably, California, which leans on standards of practice and association membership instead.[25] Where states do regulate, requirements typically include pre-licensing education, supervised experience, an exam (often the National Home Inspector Examination, NHIE), continuing education, and mandatory E&O/GL insurance. Concrete examples: Texas requires education, supervised experience, and examinations for real-estate inspectors;[26] Washington requires a state license and exam.[27]

Two private standard-setters shape practice nationwide: ASHI (American Society of Home Inspectors, founded 1976) and InterNACHI (founded 1994), which publish standards of practice, certify inspectors, and provide continuing education.[9] In states without licensing, association standards effectively fill the gap.

Building codes are also jurisdictional. The International Code Council (ICC) publishes model codes — including the International Building Code (IBC) and International Residential Code (IRC) — that states and localities adopt, amend, and enforce; the model codes are not automatically federal law.[28] On the commercial side, property-condition assessments follow the voluntary ASTM E2018 guide rather than a licensing regime, and the engineers who lead them carry their own professional credentials.[6] Firms must police scope carefully — a visual PCA is not structural engineering, environmental consulting, pest inspection, appraisal, or material testing — with report disclaimers, independence, and record retention as central risk controls.

The regulatory patchwork is itself a business fact: light or absent licensing in many states keeps barriers to entry low, which is a root cause of the industry's fragmentation.

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8. Competitive dynamics and consolidation

This is one of the most fragmented service industries in the federal data. The largest four firms account for just 7.6% of receipts; the top eight, 12.7%; the top twenty, 22%; and even the top fifty firms combined make only ~32.7% of revenue.[3] The Herfindahl-Hirschman Index (HHI) — a concentration score where 10,000 is a monopoly and anything under 1,500 is "unconcentrated" — sits at 33.1,[3] essentially zero. In plain terms: nobody has meaningful national market share, because the "market" is thousands of local, one-person businesses. Local concentration can still be higher, since the work is geographically bounded and referral-driven.

The reason is structural: barriers to entry are almost nonexistent — one person, a vehicle, a license (where required), and insurance. That keeps supply plentiful and pricing competitive, and it caps any single operator's pricing power. The strongest competitive advantages are therefore local reputation and agent relationships, inspector quality and turnaround, and — for larger firms — centralized scheduling, software, marketing, and lender/insurer/municipal relationships.

Consolidation is happening, but at the edges rather than the core:

• Brand-level franchising. Franchisors have consolidated the brands — FirstService (Pillar To Post), Neighborly/KKR (HouseMaster), Eagle Merchant Partners (AmeriSpec) — but the operators remain independent locals.[7][10][11][12]
• Private-equity residential roll-ups. Platforms such as LaunchPad Home Group (RFE-backed) are assembling regional multi-inspector firms, centralizing back-office and marketing while keeping service delivery local.[13]
• Multi-inspector firms. The clearest organic path to scale is hiring salaried inspectors and covering a metro with a fleet.
• Public acquirers of code/inspection work. Engineering firms like Willdan (Alpha Inspections) buy operators doing outsourced municipal inspection.[15]
• Private-equity roll-ups on the commercial side. The PCA/engineering consultancies are actively being consolidated by PE, where the top ~10 providers already hold an estimated 77% of that sub-market[20] — a very different structure from the residential free-for-all.
• Technology. Inspection-software platforms (scheduling, digital reports, agent portals) plus drones and thermal imaging are raising the professionalism floor and modestly favoring larger operators.

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9. Risks

• Cyclicality. Revenue is tethered to housing-transaction volume (and, on the commercial side, CRE finance), which swings hard with mortgage rates and affordability. The 30-year-low sales environment of 2025 pushed industry revenue down.[8][23] This is the defining risk.
• Inspection waivers. In tight seller's markets buyers skip inspections entirely, cutting demand independent of transaction count.[24]
• Professional liability. A missed defect can lead to lawsuits and insurance claims; E&O coverage is a permanent cost and a real exposure, especially for firms with employed inspectors.
• Commoditization and price competition. Near-zero barriers to entry mean constant new supply and limited pricing power.
• Referral-channel dependence. Reliance on real-estate-agent (or lender/insurer) referrals creates a criticized conflict of interest and concentrates customer acquisition in relationships an inspector doesn't control.
• Labor constraints. Growth depends on recruiting and retaining qualified inspectors; an aging inspector population raises succession and capacity questions.
• Regulatory fragmentation. Inconsistent state licensing and local code rules complicate multi-state expansion and quality assurance.
• Technology disruption. Remote imagery, automated report writing, and artificial intelligence may erode the value of basic inspections, even where human verification remains necessary.
• Franchise / roll-up execution. Inconsistent franchisee quality, excessive leverage, or poorly integrated acquisitions can damage a brand or platform.
• Data limits and public-company mismatch. Federal statistics omit large parts of the market, blurring market-share and valuation analysis; and listed testing, engineering, and property-services firms carry heavy exposure to unrelated end markets, so their shares may not track U.S. building-inspection demand.

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10. How to invest and the outlook

Public routes (limited and indirect). The most relevant research set is FSV, WLDN, NVEE, PRCH, BVI, SGSN, and ITRK. There is no pure-play listed security for U.S. building inspection, so the work is to isolate each company's building/inspection/software/municipal exposure, then judge organic growth versus acquisitions and watch utilization, margins, backlog, customer concentration, and liability trends. FirstService (FSV) gives the most direct franchise exposure, but an FSV thesis is really about the whole property-services company; the TIC majors offer broad inspection exposure with little U.S.-residential concentration; Porch Group (PRCH) is a bet on the inspector software layer rather than field work.[10][17]

Private routes (where the industry lives).

• Buy or build a firm. Acquire an existing local inspection business (small, cash-flowing, owner-dependent) or start one.
• Franchise. A branded startup runs roughly $40,000–$60,000 all-in plus ~7% royalties, in exchange for brand, training, and referral programs.[7]
• Roll-ups. The most institutionally interesting angles are consolidating multi-inspector residential firms (as LaunchPad is doing) or backing/buying commercial PCA consultancies — the segment PE is already actively rolling up.[13][20]
• Software / insurtech. Provide capital to inspection software, data, or insurance-technology platforms serving the trade.

Private underwriting should focus on owner dependence, license portability, inspector retention, referral concentration, E&O claims history, report quality, recurring versus transaction-based revenue, ancillary-service economics, and acquisition-integration capability.

Outlook (forward-looking judgment). Constructive but measured. Near term, the residential industry's fortunes hinge on a housing-transaction recovery: with mortgage rates drifting toward ~6% and pent-up demand from a multi-year sales trough, a rebound in existing-home sales would flow almost directly into inspection volume and reverse the ~4% revenue decline seen in 2025.[8][23] Structural tailwinds should persist regardless of the cycle — aging housing stock,[29] growth in ancillary/specialty services (radon, sewer, thermal, energy), insurance-mandated inspections in disaster-exposed states, and, on the commercial side, the expansion of climate-resilience and energy assessments layered onto traditional condition reports.[20][31] Working against all of that, near-zero barriers to entry and extreme fragmentation will keep pricing power scarce. Expect continued consolidation at the brand, platform, and firm level, slow professionalization via software, and a business whose top line will keep tracking, above all, how many buildings change hands. It is a durable-demand niche — not a high-growth software category.

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Sources

1. U.S. Census Bureau, 2022 NAICS Definition — 541350 Building Inspection Services (scope and exclusions). https://www.census.gov/naics/?input=541350&year=2022 (also 2022 NAICS Manual, https://www.census.gov/naics/reference_files_tools/2022_NAICS_Manual.pdf)
2. U.S. Census Bureau, County Business Patterns 2023, NAICS 541350 (establishments, employment, annual and Q1 payroll). https://www.census.gov/programs-surveys/cbp.html
3. U.S. Census Bureau, 2022 Economic Census — Concentration / Comparative Statistics, NAICS 541350 (firms, receipts, CR4/CR8/CR20/CR50, HHI). https://www.census.gov/programs-surveys/economic-census.html
4. U.S. Small Business Administration, Table of Size Standards, NAICS 541350 ($11.5M average annual receipts) (2023). https://www.sba.gov/document/support-table-size-standards
5. U.S. Census Bureau, NAICS 926150: Regulation, Licensing, and Inspection of Miscellaneous Commercial Sectors (government building inspection classified here). https://www.census.gov/naics/?details=926150&input=926150&year=2022
6. ASTM E2018 property-condition-assessment standard; Partner ESI, Commercial Building Inspection / Property Condition Assessments. https://www.partneresi.com/services/building-assessments-engineering/property-condition-assessments/ (background: https://en.wikipedia.org/wiki/Property_condition_assessment)
7. Topfranchise, The 10 Best Home Inspection Franchise Businesses in USA (franchise counts, fees, royalties) (2026). https://topfranchise.com/articles/the-10-best-home-inspection-franchise-businesses-in-usa/
8. IBISWorld, Building Inspectors in the US — Market Size (~$5.0bn 2025, −4.0%) (2025). https://www.ibisworld.com/united-states/market-size/building-inspectors/1405/
9. InterNACHI (International Association of Certified Home Inspectors) — membership (27,000+); ASHI (American Society of Home Inspectors) profile (2024). https://www.nachi.org/
10. FirstService Corporation, Fourth Quarter & Full-Year 2024 Results (revenue ~$5.22B) and Investor Presentation (Pillar To Post ~2% of ~$5.4B FirstService Brands system-wide sales); FirstService Brands. https://www.firstservice.com/; https://www.firstservice.com/brands/
11. PR Newswire / Neighborly, Neighborly Acquires HouseMaster (2020); Neighborly, KKR to Acquire Leading Home Services Platform Neighborly (2021). https://www.prnewswire.com/news-releases/neighborly-acquires-housemaster-301087423.html; https://www.neighborlybrands.com/press-center/news/2021/kkr-to-acquire-leading-home-services-platform-ne/
12. Eagle Merchant Partners, Investment in Furniture Medic and AmeriSpec (2023). https://eaglemerchantpartners.com/news-article/eagle-merchant-partners-makes-investment-in-furniture-medic-and-amerispec-/
13. LaunchPad Home Group (RFE Investment Partners), Platform Companies (2026). https://launchpadhomegroup.com/total-home-services/
14. HomeTeam Inspection Service, Our Story (team-based franchise model) (2026). https://hometeamfranchise.com/about-us/our-story/
15. Willdan Group, Form 10-K (Alpha Inspections — municipal building inspection and plan review) (2026). https://www.sec.gov/cgi-bin/browse-edgar?action=getcompany&CIK=0001370450&type=10-K
16. NV5 Global, Form 10-K for Fiscal Year 2024 (code compliance, third-party building inspection) (2025). https://www.sec.gov/Archives/edgar/data/1532961/000162828025007077/nvee-20241228.htm
17. Porch Group, Inspection Product Enhancements (Inspection Support Network, Home Inspector Pro, Palm-Tech) (2024). https://ir.porchgroup.com/
18. Bureau Veritas, 2024 Universal Registration Document (Building & Infrastructure; U.S. EMG acquisition) (2025). https://group.bureauveritas.com/investors
19. SGS, Building and Infrastructure Services and 2025 Full-Year Results (2026). https://www.sgs.com/en/industry/building-and-infrastructure
20. Intertek, Annual Report & Accounts 2025 (North American Building & Construction) (2026). https://www.intertek.com/investors/; commercial PCA market structure / PE consolidation: EBI Consulting, Due Diligence, https://ebiconsulting.com/services/due-diligence/
21. Angi, How Much Does a Home Inspection Cost? (avg. $344; range $296–$424) (2026); Bankrate, How Much Does a Home Inspection Cost? https://www.angi.com/articles/how-much-does-home-inspection-cost.htm; https://www.bankrate.com/real-estate/how-much-does-home-inspection-cost/
22. Inspection Support Network, Independent Home Inspector Salaries / ZipRecruiter, Self-Employed Home Inspector Salary (2026). https://www.inspectionsupport.com/independent-home-inspector-salaries/; https://www.ziprecruiter.com/Salaries/Self-Employed-Home-Inspector-Salary
23. National Association of Realtors, Existing-Home Sales (2025 total ~4.06M; Dec. 2025 SAAR ~4.35M) (2025–2026). https://www.nar.realtor/research-and-statistics/housing-statistics/existing-home-sales
24. Marketplace, Homebuyers are still waiving inspections (NAR waiver data: 25% Apr-2021 → ~30% mid-2022 → ~18%) (2024). https://www.marketplace.org/story/2024/09/30/homebuyers-are-still-waiving-inspections-could-the-latest-fed-rate-cut-help-turn-the-tide
25. Spectora, State-by-State Home Inspector Licensing Requirements (~35 states regulate; ~15 without licensing, incl. California; NHIE) (2025). https://www.spectora.com/r/home-inspector-license-requirements-map/
26. Texas Real Estate Commission, Become a Real Estate Inspector (2026). https://www.trec.texas.gov/become-licensed/real-estate-inspector
27. Washington State Legislature, Chapter 18.280 RCW: Home Inspectors (2025). https://app.leg.wa.gov/RCW/default.aspx?cite=18.280&full=true
28. International Code Council, The International Codes (IBC, IRC) (2026). https://www.iccsafe.org/products-and-services/i-codes/the-i-codes/
29. Harvard Joint Center for Housing Studies, Improving America's Housing 2025: Key Facts (median age of owner-occupied homes 42 years, 2023) (2025). https://www.jchs.harvard.edu/sites/default/files/interactive-item/files/Harvard_JCHS_Improving_Americas_Housing_2025_Key_Facts.pdf
30. Federal Emergency Management Agency (FEMA), Why Do I Need a FEMA Home Inspection? (2025). https://www.fema.gov/assistance/individual/after-applying/home-inspections
31. GlobeNewswire, CDW Engineering and Ecovert Launch Climate-Enhanced Building Condition Assessments (2025). https://www.globenewswire.com/news-release/2025/03/26/3049670/0/en/CDW-Engineering-and-Ecovert-Launch-Climate-Enhanced-Building-Condition-Assessments.html