Architects and Engineers Errors and Omissions and Professional Liability Insurance

What is Architects and Engineers Errors and Omissions and Professional Liability?

Architects and Engineers Errors and Omissions (E&O) and Professional Liability Insurance is designed to protect professionals and their firms against claims arising from alleged mistakes or negligence in the course of their work. This coverage is essential for architects, engineers, and design professionals who provide specialized services where errors could lead to financial losses, property damage, or other liabilities for their clients.

The policy is typically written on a claims-made basis, meaning it covers claims made during the policy period, provided the incident occurred after the retroactive date. High deductibles are common due to the potential severity of claims in this field.

Who Needs It

This insurance is important for:

  • Licensed architects and engineers
  • Architectural and engineering firms
  • Design-build contractors
  • Project managers and consultants in the construction or design industries

If your work involves planning, designing, or managing construction projects, this coverage can help protect your business from legal and financial risk.

What It Typically Covers

Coverage generally includes protection against claims of:

  • Professional negligence
  • Design errors or omissions
  • Breach of contract related to professional services
  • Failure to meet industry standards
  • Environmental and pollution liability (if included)

Policies may also extend to legal defense costs, even if the claim is groundless.

Common Exclusions and Limitations

While coverage is broad, there are standard exclusions such as:

  • Intentional wrongdoing or fraud
  • General liability exposures (e.g., bodily injury on premises)
  • Claims arising before the retroactive date
  • Employment-related claims
  • Cost to repair or replace faulty work

Always review your policy terms to understand specific limitations and conditions.

Factors That Influence Cost

Several underwriting factors can affect premium rates and coverage availability, including:

  • Professional qualifications of the firm's principals
  • Types of services offered
  • Project size and complexity
  • Geographic location and regulatory environment
  • Claims history
  • Staff size and organizational structure

Proof of Insurance and Compliance

Clients and project owners often require proof of professional liability coverage before awarding contracts. Certificates of insurance (COIs) are commonly used to verify coverage. Some states or licensing boards may also have compliance requirements related to minimum coverage limits.

How to Get a Quote

Getting coverage tailored to your firm’s needs is simple. Start your quote online today by visiting our quote page.

Frequently Asked Questions

What is the difference between E&O and professional liability insurance?

They are often used interchangeably. Both protect against claims of professional negligence, but some policies may use different terminology depending on the industry.

Is this insurance required by law?

Not always, but many clients, contracts, and licensing bodies require proof of coverage before work begins.

Does the policy cover work done before I bought it?

Only if the policy includes prior acts coverage and the work occurred after the retroactive date listed in your policy.

Will it cover subcontractors or consultants I hire?

Typically, only if they are specifically named in the policy or covered under your firm’s operations. Separate coverage may be needed.

How long should I keep this insurance?

As long as you’re providing professional services—and even afterward, to protect against late claims. Claims-made policies require continuous coverage.

Still have questions? Talk to a local insurance expert.

Partners, Programs & Market Access


We maintain relationships with nationally recognized and specialty-focused insurance providers that actively underwrite this class of business. Our network includes both admitted and non-admitted markets, allowing us to match risks—from straightforward accounts to more complex or hard-to-place exposures—with appropriate underwriting partners.


Program availability, coverage terms, and underwriting appetite can vary based on operations, location, and loss history, so access to multiple markets is key to securing the right fit. This approach helps ensure broader coverage options and more competitive placement across a range of risk profiles.



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