Insurance and bonds

What does errors and omissions mean in construction?

Errors and omissions are mistakes or missing information in professional work, such as plans and specifications. The term also names the professional liability insurance that covers claims arising from them.

Two construction professionals review paper plans beside a tablet at a jobsite workbench.
Plan reviews connect field conditions, drawings, and the next decisions on a job. AI-generated illustration.

In construction, errors and omissions (E&O) has two meanings that travel together. First, it describes design problems: an error is something drawn or specified wrong (a beam undersized, a door swing that hits a column), and an omission is something left out (no blocking for wall-hung equipment, a missing fire damper). Second, it is the shorthand for professional liability insurance, which covers claims that a professional's negligent service caused someone a loss.

Architects and engineers usually carry E&O coverage. Contractors increasingly need it too, especially on design-build work, delegated design, or when they do in-house drafting, engineering, or construction management.

How E&O plays out on a real job

A general contractor is building a $4.8 million clinic under a design-bid-build contract. During rough-in, the mechanical sub finds that the drawings show a rooftop unit the structural drawings never framed for. The contractor issues an RFI. The architect responds with added steel, and the owner pays a $38,000 change order plus a week of time.

Who ultimately pays? In DBB, the owner generally pays the contractor for the change, then may look to the design team. Whether the architect's E&O policy responds depends on whether the omission fell below the professional standard of care, not simply on whether a mistake happened. Some owners carry a design contingency precisely because perfect drawings do not exist.

For the contractor in DBB, the practical job is documentation. Send the RFI the day the conflict is found, price the fix with backup, and record any lost time in the daily log. If the owner later pursues the architect, the contractor's paper trail is what both sides will read.

Flip the scenario to design-build. Now the contractor holds the design contract with the owner. The same $38,000 is likely the contractor's cost, and its own professional liability coverage (or its architect's) is what stands between that cost and the job's profit.

Common mistakes and disputes

  • Assuming general liability covers design. Standard commercial general liability insurance policies commonly exclude professional services. Ask the broker in writing.
  • Contract language that shifts design risk. Clauses that make the contractor responsible for 'coordination' or 'verification' of drawings can move omissions onto the builder.
  • Delegated design without coverage. Specs that require the sub to engineer stairs, curtain wall, or fire sprinklers carry professional risk.
  • Missed notice. E&O policies are typically written on a claims-made basis, so the claim must be reported while the policy is in force or within its reporting window.

Related terms

E&O is linked to constructability reviews, specifications, shop drawings, and construction defects. For the insurance side of sub management, see how to track subcontractor insurance certificates.

Frequently asked questions

Is E&O the same as professional liability insurance?

In practice, yes. Errors and omissions insurance and professional liability insurance are used interchangeably for coverage of negligent professional services.

Do general contractors need E&O insurance?

Not always. It becomes important when a contractor provides design, delegated engineering, preconstruction consulting, or construction management services. Ask your broker based on your contracts.

Does a design error automatically mean the architect pays?

No. Professionals are generally held to a standard of care, not perfection. Many design errors are treated as an expected cost of construction.

What is claims-made coverage?

A policy that covers claims first made and reported during the policy period, rather than incidents that happened during it. Gaps in coverage can leave old projects uninsured.

Written and edited by

Maurice Francois writes and edits construction operations guides for Smart Business Automator. More from Maurice on the Scaling Legends podcast.

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