Professional Liability Insurance
When Does a Subcontractor Need Their Own Professional Liability Policy?
When Does a Subcontractor Need Their Own Professional Liability Policy? — what contractors need to know to protect against professional liability claims.
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Not Every Sub Needs PL — But Some Absolutely Do
Professional liability insurance (also called Errors & Omissions or E&O) protects contractors when a client claims your professional advice, design input, or project management decisions caused them financial harm. It covers legal defense costs and settlements — gaps that general liability leaves wide open.
The General Rule: Does the Sub Provide Professional Services?
Subcontractors who install per the GC’s or owner’s specifications with no design input, sizing recommendations, or professional consulting role typically don’t need professional liability. Trade contractors following plans provided by others are primarily a GL and workers’ comp exposure.
When Subs Cross Into Professional Services Territory
A subcontractor needs their own PL when they: provide system sizing or design (HVAC, electrical, plumbing), recommend specific products with performance implications, prepare shop drawings with engineering implications, manage other subcontractors, or perform any advisory role beyond installation.
Design-Assist Subcontractors
Design-assist arrangements — where a specialty sub contributes design expertise to the GC’s design-build process — create clear professional liability exposure for the sub. If the sub’s design contribution proves wrong, they can be named in a professional liability claim even if the GC is the primary design-build entity.
Contractual Requirements From GCs
Many GCs now include professional liability requirements for certain specialty subs — particularly HVAC, electrical, and structural specialty contractors. Review your subcontractor agreement for any PL requirements before executing the contract.
Subrogation Risk Without PL
If a GC’s professional liability insurer pays a claim and the root cause is a subcontractor’s professional error, the insurer may subrogate against the sub. Without their own PL, the sub faces this claim uninsured — a financially devastating position for a small specialty contractor.