Great news! You won the contract to build that new project. You've seen to the details, like sending certificates of insurance to the owner that meet their workers' compensation and general liability requirements. Make sure those certificates follow best practices; see Contractor Insurance, Certificates and Liability Issues.
And now you begin gathering submittals, shop drawings and change orders. What's missing?
Have you considered the engineering, value‑engineering or design aspects of those documents? General liability typically excludes these professional services from coverage. It's an important grey area to understand before a problem arises.
Any time you vary from the architect's or engineer's drawing, you are technically redesigning the project. Many changes are minor and inconsequential to overall building strength, but other seemingly small substitutions can affect systems and code compliance.
For example, if you substitute a slightly less efficient light fixture because the specified unit is unavailable, you may violate the project's energy code. Because energy-code compliance is design driven, that substitution can expose you to a professional liability claim.
When the architect is sued over the compliance issue, they may point to changes made in the field. The resulting claim can be a grey area: did you simply fail to complete an operation correctly, or did you effectively redesign the building's energy performance? Often it's a mix, but the professional-liability element can be significant.
Do you build or install prefabricated components such as roofing assemblies? If the manufacturer provides structural drawings, do you review and endorse them before installation? Who assumes responsibility for the design intent?
Does your company perform construction management, expediting, or value engineering? When you submit change orders, do you suggest improvements in design or function? Those actions can be treated as professional consulting or design work, and mistakes may fall under professional liability.
There is an element of design and value engineering in many routine decisions. Where the grey ends and professional exposure begins is not always clear, so document your choices and communications.
For instance, if you use a high‑early concrete mix to get steel erected sooner, note any questions about long‑term setting qualities and ask the project architect or engineer to confirm the change in writing.
If you do actively engage in consulting, value engineering or design work, purchase professional liability coverage regardless of project insurance requirements; learn more about options at Contractors Professional Liability Insurance. If you're unsure how a given substitution or recommendation affects coverage, talk to an agent.
Frequently Asked Questions
When can a substitution trigger a professional liability claim?
If a substitution affects design performance, code compliance, or system interactions, it can trigger professional exposure even if the change seems minor.
Does general liability ever cover design mistakes?
General liability usually excludes errors in professional services; design-related mistakes are often addressed by professional liability policies instead.
How should contractors document design-related decisions?
Write memos, request written confirmation from the architect or engineer, and record change orders and communications to create a clear paper trail.
Should I buy professional liability if I only make occasional design suggestions?
Yes—if you provide any consulting, value engineering, or design advice, professional liability can protect against errors and omissions claims.