The line between building and designing keeps blurring — design-build delivery, delegated design on connections and systems, value engineering suggestions, BIM coordination. Every step across that line creates professional exposure, and here's the problem: your general liability policy excludes professional services. The claim alleging your design was wrong lands in a gap unless someone built coverage for it.
Where contractors pick up professional exposure
- Design-build contracts, obviously — you own the design, even when you subcontract it to an architect or engineer
- Delegated design: specs that make you responsible for engineering — steel connections, cold-formed framing, fire suppression layout, trusses
- Value engineering: your money-saving substitution becomes your design liability the moment it's incorporated
- Means-and-methods engineering: shoring, formwork, crane plans — engineered temporary works are professional services
- Construction management and owner's-rep work, where your product is judgment rather than construction
Why the GL won't answer
GL responds to bodily injury and property damage from your operations — and excludes professional services. A design error claim is often neither injury nor damage in the GL sense anyway: it's the cost of redesign, delay, and correction, which are economic losses GL was never built for. Contractors professional liability (CPrL) — construction-specific E\&O — covers design errors, both your in-house work and your liability for design professionals you hire, plus in better forms, protective coverage when the designer you hired can't pay for their own mistake.
Who should buy it
Any contractor signing design-build contracts, full stop. Beyond that: trades with routine delegated design (steel, mechanical, fire protection), CM firms, and anyone whose contracts include design responsibility language — which is worth actually checking, because owners increasingly slip it in. Premiums scale to the exposure, and the first design-build job that requires the coverage is the natural moment to build it. Bring the contract; the exposure is usually visible right there in the scope.
This material is for general information only. Coverage depends on the actual policy language, and availability varies by carrier.