Short Answer
Some professional liability policies include a general liability warranty. It requires the insured to keep separate general liability coverage in force during the professional liability policy period. The requirement may specify minimum limits and Products and Completed Operations coverage. Because the exact terms and consequences depend on the policy wording, architects and engineers should check the warranty before binding.
Why professional liability and general liability are separate
Professional liability responds to claims that arise from professional services, such as a design error or a missed detail in a drawing. General liability responds to bodily injury and property damage from premises, operations, and completed work. A design firm often needs both, and each policy is written to leave the other's exposure alone.
Why a carrier may require general liability
Some carriers want to know the firm has a general liability program before they take on the professional exposure. The requirement helps keep claims on the policy built for them. A bodily injury claim that belongs under general liability is less likely to land on the professional liability policy when the firm maintains proper GL coverage.
What a warranty is in an E&O policy
A warranty is a promise the insured makes as a condition of coverage. In this case, the insured agrees to maintain certain general liability coverage while the professional liability policy is active. If the promise is not kept, the policy's stated consequences can apply. Those consequences are written into the applicable warranty and vary by carrier.
Products and completed operations coverage
A per-occurrence limit is the most the policy pays for a single event. An aggregate limit is the most it pays during the policy period. A warranty may set a minimum for one, the other, or both. It may also set separate minimums for general liability and for products and completed operations.
Why having a GL policy may not be enough
A firm can hold a general liability policy and still fall short of the warranty. The limits may be lower than required, or the products and completed operations aggregate may not match. The policy may also exclude coverage the warranty expects, or leave out the type of work the firm performs.
Why exclusions on the GL policy matter
Some general liability policies carry exclusions or limitations that affect design work, such as a professional services exclusion. A warranty may require coverage that those exclusions remove. Reading the GL endorsements alongside the warranty shows whether the two fit together.
Why to verify compliance before binding
Checking after a claim is the wrong time to learn about a gap. Comparing the GL policy to the warranty before the professional liability policy is bound lets the firm fix any shortfall in advance. That may mean raising limits, adding coverage, or asking the carrier to clarify the wording.
Potential consequences if coverage isn't maintained
The consequences depend on the wording of the warranty. Some policies may reduce or limit coverage, and others may address it differently. The policy language controls, so the firm should read that section and ask the broker to explain it.
Example
An engineering firm carries a $1M professional liability limit. Its BOP provides $1M general liability per occurrence and a $2M products and completed operations aggregate.
The firm should compare those limits and coverages directly against the warranty in the professional liability policy. It should not assume the BOP satisfies the requirement. The warranty might ask for higher per-occurrence limits, a different aggregate, or specific completed operations wording. Only the actual policy language answers that.
What to check in your own policy
- Look for a general liability warranty in the conditions, declarations, or endorsements
- Note the required per-occurrence and aggregate limits
- Confirm whether products and completed operations coverage is required
- Compare the requirements against your current GL policy and its exclusions
- Ask your broker what the warranty says happens if coverage lapses
Related Questions
What is a general liability warranty in professional liability insurance?
It's a condition requiring you to maintain separate general liability coverage while the professional liability policy is in force. The details vary by carrier.
Does my BOP satisfy the general liability warranty?
Possibly. Compare your BOP limits, products and completed operations coverage, and exclusions against the warranty wording before assuming it does.
Why does professional liability need general liability alongside it?
The two policies cover different exposures. Professional liability addresses design errors, while general liability addresses bodily injury and property damage.
What happens if I let my general liability policy lapse?
The consequences depend on the warranty wording. Read that provision or ask your broker before letting any required coverage lapse.
Do all E&O policies include a general liability warranty?
No. Some do and some don't, so check the specific form you're considering.
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Read MoreAuthor:
Hardcover Editorial Team
Reviewed by:
Hardcover Insurance Team
Last reviewed:
September 28, 2026
This article is educational and does not provide legal advice or determine whether a specific claim is covered. Policy terms, exclusions, underwriting requirements, and applicable law vary. Consult your insurance professional and qualified legal counsel regarding your circumstances.