The Court of Appeals for the Seventh Circuit determined there was no duty to defend or to indemnify the additional insured for the named insured's defective work. St. Paul Guardian Ins. Co., et al. v. Walsh Construction Co., 99 F. 4th 1035 (7th Cir. 2024).

The City of Chicago contracted with Walsh Construction Company to manage the construction of a canopy and curtain wall system at O'Hare International Airport. Walsh entered into a contract with Carlo Steel Corporation, which in turn subcontracted with LB Steel, LLC to fabricate and install steel columns to support the wall and canopy. LB Steel listed Walsh as an additional insured in its commercial general liability policies. LB Steel's insurers were St. Paul, Travelers, and Charter Oak Fire Insurance Company.

Several years into the project, the City discovered cracks in the welds of the steel columns and sued Walsh. Walsh, in turn, sued LB Steel under its subcontract. Walsh also asked LB Steel's insurers to defend it in the City's lawsuit, but they refused to do so. Walsh eventually secured a judgment against LB Steel, but LB Steel declared bankruptcy. Walsh then sued LB Steel's insurers to recover the costs of defending against the City's lawsuit and indemnification for any resulting losses.