What Standard Of Care Actually Means In A World Of 30 Alternatives

What Does "Construction" Actually Mean?

In everyday use, construction is the process of building structures, infrastructure, and industrial facilities. The U.S. Bureau of Labor Statistics classifies the industry under NAICS 23² across three subsectors:

• Construction of Buildings (236) — residential and commercial structures
• Heavy and Civil Engineering Construction (237) — roads, bridges, utilities, energy
• Specialty Trade Contractors (238) — electrical, plumbing, mechanical, finishes

That's the dictionary answer. It's also the answer that does the least work for an AEC principal.

In legal use, the same word means something else entirely. In contract law, "interpretation" determines what words mean. "Construction" determines what they do¹. The clause that decides whether your insurance pays a $4M claim will be construed by a judge, not by the architect who drafted it.

The legal sense is where the money lives. And it starts with one phrase: standard of care.

The One Standard Your Insurance Actually Protects

The common-law standard of care for an architect or engineer is the ordinary, reasonable skill and care that competent peers in the same locality, at the same time, on a similar project would exercise. It is not perfection. It is the only version your professional liability policy is built to cover.

This formulation is the source of truth your E&O carrier underwrites against. Two contract documents express it almost identically.

AIA B101-2017 §2.2 is the dominant U.S. architect agreement. Its standard-of-care clause reads³:

The Architect shall perform its services consistent with the professional skill and care ordinarily provided by architects practicing in the same or similar locality under the same or similar circumstances. The Architect shall perform its services as expeditiously as is consistent with such professional skill and care and the orderly progress of the project.

EJCDC E-500 is the flagship agreement for engineers, published jointly by ASCE, ACEC, and NSPE. Its parallel clause reads⁴:

The standard of care for all professional engineering and related services performed or furnished by Engineer will be the care and skill ordinarily used by members of the subject profession practicing under similar circumstances at the same time and in the same locality.

Three things are doing the work in both clauses. Ordinarily provided. Same or similar locality. Same or similar circumstances. Together they anchor the duty to what a reasonably prudent peer would actually do— not to a perfectionist ideal nobody could meet.

The American Society of Civil Engineers (ASCE) put it bluntly in its December 2025 analysis: "Negligence, not perfection, is the appropriate basis for liability"⁵. AIA Trust frames it the same way: "Perfection is not the standard of care for the practice of architecture"⁶. ConstructionRisk Counsel notes that courts have observed design professionals work in inexact sciences and cannot be held to perfect accuracy⁷.

The locality rule is the formal standard. In practice it's evolving toward broader regional or national comparisons in some jurisdictions⁵. That nuance matters when a firm in a small market gets compared to peers in a larger one.

Why does this matter for insurance? Because professional liability (E&O) policies are underwritten against exactly this common-law floor. The moment a contract pushes you above it, the policy that's supposed to have your back has a gap in it.

If this were the only standard out there, contracts would be boring. It isn't— and the catalog is wider than most principals realize.

The Catalog Of Alternatives— Why There Are 30+ Versions In Active Use

There isn't one standard of care. Between three dominant contract families, multiple editions, owner-drafted heightened variants, project-delivery-method adjustments, and a growing roster of state statutes, an AEC principal can plausibly encounter 30+ materially different formulations in active rotation. Here is the catalog.

4A. The three canonical contract families

The first family is AIA B101-2017, the dominant architect agreement, anchored to ordinary skill and care in the same locality and circumstances³.

The second is EJCDC E-500, the engineer-side flagship. Its locality-and-circumstances anchor matches AIA B101's almost word for word— with one important addition: the agreement explicitly disclaims warranties⁴. Engineers walk in with the same standard plus a defensive layer architects sometimes have to add by hand.

The third is ConsensusDocs 240, drafted by a coalition led by the Associated General Contractors. Its language is similar to the AIA and EJCDC forms with a subtle shift. ConsensusDocs 240 requires the design professional to furnish services "necessary to design the Project" and to perform them "in accordance with the standard of professional skill and care required for a project of similar size, location, scope, and complexity"⁸. The "necessary to design the Project" phrasing moves buildability risk a step toward the designer. It's small. It's also the kind of small that pays in court.

4B. The owner-drafted heightened variants

This is where the catalog explodes. Owner counsel routinely draft language that pushes design professionals above the common-law floor. Insurance-broker risk-management literature flags the trigger vocabulary that does it⁹¹⁰:

• "Highest standard of care"
• "Best practices of the industry"
• "Best efforts"
• "Ensure," "guarantee," "warrant"
• "Error-free" / "complete and accurate"
• "Fit for purpose" (UCC-style warranty)
• Absolute compliance with "any and all" laws
• Budget guarantees forcing redesign at firm cost

Each phrase looks reasonable in isolation. Together they form a vocabulary that takes a firm out of common-law coverage and into uninsurable contractual territory¹⁰. Picture a 50-person engineering firm signing an owner-drafted construction contract that says the firm "warrants designs are complete, accurate, and free of errors." That single phrase moves the firm above the standard its E&O carrier assumed it signed.

4C. Project-delivery-method adjustments

Delivery method tweaks the formulation in practice. Design-Bid-Build brings the Spearin Doctrine into play— a 1918 U.S. Supreme Court case that implies a warranty that design documents are buildable¹¹. Design-Build merges design with constructability risk in a single entity, which changes how a court reads the standard. CMAR (Construction Manager at Risk) splits design and construction duties differently again. IPD (Integrated Project Delivery) layers collaborative liability sharing on top. Each method tweaks the standard. Full treatment of each is its own article.

4D. State statutory baselines

A growing list of states now sets the standard of care for design professionals by statute and voids contract provisions that try to raise it. Texas leads the pack with HB 2116 / §130.0021. Alabama enacted parallel protection in 2021. California, Colorado, and Louisiana have similar statutes⁵. Section 6 walks through Texas in detail and explains the practical leverage.

4E. Sustainability and AI-augmented practice

The standard of care isn't static. It's pinned to what a reasonably prudent peer does now. Two pressures keep moving the floor.

LEED certification and green-building outcomes raise an open question: are sustainability expectations part of the ordinary standard of care? The AIA Trust's 2016 report flagged this as under-litigated¹². It still is.

The second pressure is technological. AI design tools, BIM, parametric modeling, and automated clash detection are quietly raising "ordinary practice" in some markets. A firm that falls materially behind peer tooling is being judged by a standard that's drifting away from them. This is also where contract review and AI strategy quietly meet— how AI clauses are reshaping engineering services contracts is the next conversation a sophisticated principal is already having.

Why does this catalog matter financially? Because your professional liability policy was underwritten against exactly one of the formulations above— and it's not the one most owners try to draft you into.

What Your Insurance Assumes Versus What You Actually Signed

Heightened-care contract language voids professional liability (E&O) coverage through two stacking policy exclusions: the contractual liability exclusion and the express warranty exclusion⁹¹⁰. Together they deny coverage for any duty above the common-law standard. The firm absorbs both the claim and the litigation cost from its own balance sheet.

The mechanism is straightforward. The contractual liability exclusion in standard E&O policies removes coverage for liabilities the insured assumed by contract above what the law would have imposed. The express warranty exclusion does the same for warranty-like promises. Stack the two and you have a policy that will pay for ordinary negligence but disappear the moment a heightened-care clause is in play.

Greyling Insurance Brokerage states the principle directly: "If a design professional agrees by contract to perform duties beyond those required by ordinary standards of care, the quality of that performance must comport with the contractual terms"¹⁰. Courts enforce that language literally¹³. The Hartford's underwriting guidance reinforces the same trigger vocabulary listed above⁹. ASCE reframes the entire premise: "Negligence, not perfection, is the appropriate basis for liability"⁵.

Most clauses never trigger a claim. When one does, the firm loses everything. A $4M change-order claim against a contract requiring "error-free" deliverables becomes a $4M-plus-defense-costs claim with no carrier coverage. That's the math owners aren't running for you when they hand you the contract.

This is also why building a defensible AI governance posture belongs in the same risk conversation— the same disciplines that keep contract liability bounded keep AI deployment liability bounded, and they share the same review cycle.

The law has started to notice. A growing list of states now voids heightened-care clauses by statute— and Texas leads the pack.

What The Law Is Doing About It

As of September 1, 2021, Texas voids any contract provision that establishes a standard of care different from the statutory baseline— ordinary professional skill and care. Alabama, California, Colorado, and Louisiana have passed parallel protections, and the model is spreading⁵.

Texas Civil Practice and Remedies Code §130.0021 makes the rule explicit¹⁴¹⁵:

A construction contract for architectural or engineering services or a contract related to the construction or repair of an improvement to real property must require that the architectural or engineering services be performed with the professional skill and care ordinarily provided by competent architects or engineers practicing under the same or similar circumstances and professional license. A provision in a contract that establishes a different standard of care is void and unenforceable, and the standard of care required by Subsection (a) applies.

Bracewell LLP confirms the statute went into effect on September 1, 2021 and applies to construction contracts entered into on or after that date¹⁶. There's a caveat principals running design-build or EPC work should know: Texas's duty-to-defend rule has different treatment for those project structures— a question worth a quick call with counsel before signing.

ASCE reports that parallel statutes have been enacted in Alabama (2021) and exist in California, Colorado, and Louisiana⁵. The pattern is clear: the law is catching up with the heightened-care drafting problem.

The strategic point: in protected states, the statute does the negotiating for you. An owner can draft "highest standard of care" into a Texas construction contract all they want. The clause is void on arrival.

Knowing the catalog is one thing. Walking into Monday's contract review with a plan is another. Here's what to do this week.

What To Do This Week— A Contract-Review Move

The single most consequential contract-review move an AEC firm can make is to red-pen any clause that imports heightened-care language and replace it with the common-law formulation from AIA B101 §2.2 or EJCDC E-500. Insurance brokers and construction-risk attorneys have been recommending the same redline for years⁹¹⁰. Here's the working list— review the marked-up contract with construction counsel before sending it back, since heightened-care language interacts with indemnification, defend, and insurance clauses in ways the strike-list alone won't catch.

7A. The strike-list (what to red-pen)

Phrases that move a firm out of E&O coverage and into uninsurable contractual territory⁹¹⁰¹⁷:

• "Highest standard of care"
• "Best practices of the industry"
• "Best efforts"
• "Ensure," "guarantee," "warrant"
• "Error-free" / "complete and accurate"
• "Fit for purpose"
• Absolute compliance with "any and all" laws
• Budget guarantees forcing redesign at firm cost

Greyling also recommends an express disclaimer added defensively: "Design Professional expressly disclaims all express or implied warranties and guarantees"¹⁰.

7B. The insist-list (what to put back in)

Replace struck language with the common-law formulation³:

• "The professional skill and care ordinarily provided by [architects/engineers] practicing in the same or similar locality under the same or similar circumstances."
• A locality, time, and circumstances anchor
• An explicit warranty disclaimer (Greyling's language above)
• A standard tied to "ordinarily provided" or "ordinary professional skill and care"

The American Bar Association's Forum on Construction Law makes the same point in its Spring 2025 analysis titled Less than Perfection: Demystifying the Standard of Care for Design Professionals¹⁸. ENR has flagged the same trap¹⁷. This isn't fringe risk-management advice. It's the consensus from the publications the audience already reads.

In Texas, Alabama, California, Colorado, and Louisiana, the statute already voids the heightened version— let the law negotiate for you⁵. In the other 45 states, the red pen has to do the work.

The AI/technology angle

The standard of care is a moving floor. AI design tools, BIM clash detection, and parametric modeling are quietly raising what counts as "ordinary practice" in some markets. A firm that falls materially behind peer tooling is being judged by a standard that's drifting away from them. This is where contract review and AI strategy quietly intersect— both come down to understanding what "ordinary" means in your practice area right now, and setting AI-era expectations in the project kickoff is part of the same operating discipline.

If your firm is sorting through which contract templates, AI tools, and process changes belong in your next-year roadmap, that triage is the conversation working with a technology consultant who knows your contract landscape can structure. The contract conversation is rarely separate from the strategy conversation.

A few questions come up in nearly every contract review. Quick answers below.

FAQ — Standard Of Care, Construction, And Contracts

What does "construction" mean in a contract?

In a contract, "construction" has two senses: the physical work of building, and the legal process of interpreting contract language to determine its legal effect. The second sense is what governs how a court will read your standard-of-care clause¹.

What is the standard of care for an architect?

The skill and care ordinarily provided by architects practicing in the same or similar locality under the same or similar circumstances— not perfection. This is the language in AIA B101-2017 §2.2³.

What is the standard of care for an engineer?

The care and skill ordinarily used by members of the profession practicing under similar circumstances at the same time and in the same locality. The EJCDC E-500 agreement uses this formulation and explicitly disclaims warranties⁴.

Does professional liability insurance cover a "highest standard of care" clause?

No. Professional liability (E&O) insurance covers only the common-law standard. Heightened-care language falls under the contractual liability exclusion and the express warranty exclusion, leaving the firm to absorb the claim⁹¹⁰.

Can a state law override a contract's heightened standard of care?

Yes. Texas Civil Practice and Remedies Code §130.0021 voids any contract provision establishing a different standard of care for architectural or engineering services¹⁴. Alabama, California, Colorado, and Louisiana have parallel statutes⁵.

What's the difference between AIA B101 and ConsensusDocs 240?

AIA B101 anchors the standard to professional skill and care "ordinarily provided"³. ConsensusDocs 240 adds "necessary to design the Project" language— a subtle shift that moves buildability risk toward the designer⁸.

Are LEED certification or green-building outcomes part of the standard of care?

Whether sustainability expectations fall within the ordinary standard of care remains an open, under-litigated question¹². Design professionals should avoid guaranteeing LEED outcomes by contract.

References

1. Cornell Law School Legal Information Institute, "construction — Wex Legal Dictionary" (2024) — https://www.law.cornell.edu/wex/construction
2. U.S. Bureau of Labor Statistics, "Construction: NAICS 23 — Industries at a Glance" (2024) — https://www.bls.gov/iag/tgs/iag23.htm
3. American Institute of Architects, "AIA Document B101-2017 Standard Form of Agreement Between Owner and Architect" (2017) — https://agendasuite.org/iip/fannin/file/getfile/17693
4. Engineers Joint Contract Documents Committee (EJCDC), "EJCDC E-500, Agreement Between Owner and Engineer for Professional Services" (2014) — https://www.cityofjohnday.com/sites/default/files/fileattachments/public_works/page/4813/attachment_d_-_ejdc_e500_professional_services_contract.pdf
5. American Society of Civil Engineers (ASCE), "The design professional's standard of care: Legal foundations, contractual risks, and evolving protections" (2025) — https://www.asce.org/publications-and-news/civil-engineering-source/article/2025/12/17/the-design-professionals-standard-of-care-legal-foundations-contractual-risks-and-evolving-protections
6. AIA Trust, "Understanding the Standard of Care" (2017) — https://theaiatrust.com/understanding-standard-care/
7. ConstructionRisk Counsel (J. Kent Holland), "Standard of Care for Design Professionals" (2015) — https://www.constructionrisk.com/2015/09/standard-of-care-for-design-professionals/
8. ConsensusDocs, "Designing a Fair Standard of Care in Design Agreements" (2022) — https://www.consensusdocs.org/designing-a-fair-standard-of-care-in-design-agreements/
9. The Hartford, "What is the Professional Standard of Care: Ordinary" (2020) — https://assets.thehartford.com/image/upload/standard_of_care_article.pdf
10. Greyling Insurance Brokerage, "Standard of Care" (2024) — https://greyling.com/insights/standard-of-care/
11. Engineers Joint Contract Documents Committee (EJCDC), "Spearin and the Standard of Care" (Kevin O'Beirne, 2018) — https://www.ejcdc.org/wp-content/uploads/2018/04/Spearin-and-Standard-of-Care.pdf
12. AIA Trust, "A Sustainable Standard of Care?" (2016) — https://theaiatrust.com/wp-content/uploads/2016/01/A-Sustainable-Standard-of-Care-Report.pdf
13. Lewis Brisbois (Professional Liability Update), "Design Contracts Imposing Duties Beyond Ordinary Care Create Extraordinary Risk" (2018) — https://professionalliabilityupdate.com/2018/08/30/design-contracts-imposing-duties-beyond-ordinary-care-create-extraordinary-risk/
14. State of Texas / Justia U.S. Law, "Texas Civil Practice and Remedies Code Section 130.0021 — Architect's, Engineer's, or Land Surveyor's Standard of Care" (2021) — https://law.justia.com/codes/texas/civil-practice-and-remedies-code/title-6/chapter-130/section-130-0021/
15. Texas Legislature, "Texas Statutes — Civil Practice and Remedies Code, Chapter 130" (2021) — https://statutes.capitol.texas.gov/Docs/CP/htm/CP.130.htm
16. Bracewell LLP, "The New Rules (Part 2): Restrictions on the Duty to Defend for Architects and Engineers" (2021) — https://www.bracewell.com/resources/new-rules-part-2-restrictions-duty-defend-architects-and-engineers/
17. Engineering News-Record, "Perfection Not Required: Beware Standard-of-Care Contract Clause Traps" (2020) — https://www.enr.com/blogs/21-why-risk-it/post/15995-perfection-not-required-beware-standard-of-care-contract-clause-traps
18. American Bar Association Forum on Construction Law, "Less than Perfection: Demystifying the Standard of Care for Design Professionals" (2025) — https://www.americanbar.org/groups/construction_industry/resources/construction-lawyer/2025-spring/less-perfection-demystifying-standard-care-design-professionals/