Two Policies, One Seam
Every design firm carries two liability policies that look like overlapping protection and are, in fact, carefully divided labor. The Commercial General Liability policy answers for bodily injury and property damage arising from your operations — the visitor who trips in your office, the space heater that scorches a leased suite. Your Professional Liability, or E&O, policy answers for the consequences of a negligent design — the miscalculated beam, the specification that fails in the field. Between those two mandates runs a seam, and the discipline of coverage is knowing exactly where it falls. A single claim that lands on that seam can be denied by both carriers at once, each pointing to the other’s policy as the right home. Understanding that seam is the difference between a firm that is insured and a firm that merely holds two certificates.
The Exclusion That Draws the Line
The seam exists because the CGL deliberately steps back from your core work. A professional services exclusion — added by endorsement, most commonly ISO form CG 22 43 for architects, engineers, and surveyors — removes coverage for bodily injury, property damage, and personal injury “arising out of the rendering of or failure to render” professional services. IRMI frames its purpose plainly: the exclusion exists to segregate general liability from professional, or E&O, exposures, leaving only the general-liability piece insured under the CGL. And the definition reaches well beyond drawings and calculations. Form CG 22 43 sweeps in supervisory, inspection, and architectural or engineering activities, and courts have read the trigger language expansively — “arising out of” has been held to mean considerably more than “caused by.”
The Other Half Does Not Fill It
The intuitive assumption — my E&O picks up whatever the CGL drops — is where principals get surprised. Professional liability responds to injury and damage when they flow from a professional error, not from ordinary operations, and it is written claims-made rather than occurrence. It will not answer for a garden-variety premises injury any more than the CGL will answer for a flawed design. The two policies were drafted to interlock, not to overlap. When a loss cannot be cleanly characterized — is it a design failure or a construction means-and-methods failure, a professional act or a general one — the interlock can leave a hollow space where each policy’s exclusion begins exactly where the other’s coverage ends.
When Both Carriers Point Away
Consider a decision that still instructs. In “EIC Group v. Travelers” (New Jersey Appellate Division, 2016), an engineering firm’s CGL carrier disclaimed a flooding claim under a professional services exclusion the court called broad — broad enough to reach supervision, inspection, construction administration, and management. Because the firm had provided only design services, every defense dollar was attributed to excluded professional work, and the CGL paid nothing. Now run the mirror image: an architecture firm’s design is sound, a subcontractor’s crew deviates from the specifications, and a worker is injured. The CGL carrier can deny anyway — the firm “created the designs” — even though the loss has nothing to do with professional judgment. Some courts rescue the insured through the illusory-coverage doctrine, honoring a firm’s reasonable expectation that its policy cover its actual operations, but that rescue is jurisdictional and never guaranteed.
The Additional-Insured Collision
The gap widens the moment a contract enters the room. Owners and contractors routinely demand to be named as additional insureds on your CGL, and your certificate dutifully confirms it. Yet additional-insured status on a CGL carries that policy’s exclusions along with it — so when the upstream party is sued over your design, the professional services exclusion bars the very coverage the certificate appeared to promise. The protection looks complete on paper and evaporates on the facts. This is why disciplined contract review treats the additional-insured language and the professional services exclusion as one question rather than two, and why professional liability — which cannot extend additional-insured status the way a CGL does — has to be addressed through its own contractual mechanisms, not a checkbox on a certificate of insurance.
Structuring So Nothing Falls Through
The work, then, is to read GL and PL as a single architecture rather than two purchases. Align the policies’ definitions of professional services so neither carrier can disclaim onto the other’s turf; confirm your E&O does not broadly exclude bodily injury arising from your design; and weigh the carvebacks and supplemental grants — rectification coverage, protective indemnity, means-and-methods language — that close documented gaps. This is precisely the seam our four-step strategic process is built to work: Strategic Discovery to map how your firm actually delivers, Risk Assessment to uncover where the two policies leave daylight, Solution Design to align the forms and endorsements, and Ongoing Optimization as your scope and your contracts evolve. A certificate can tell you that you own two policies. Only a deliberate review can tell you they meet in the middle — and that nothing you do for a living falls into the space between them.
— Ryan Mefford, President & Risk Advisor