Design-build has stopped being the alternative delivery method and started becoming the default. Industry research projects that design-build will account for roughly 47 percent of construction spending — near $1.9 trillion across the segments studied — with total design-build spending growing more than 22 percent through the middle of this decade. Progressive design-build, where the owner splits the work into distinct phases to lock in cost and schedule, is gaining ground in 2026 as data centers, energy infrastructure, and complex institutional work move to the model. The delivery method has changed. For many mid-size general contractors, the risk profile has not caught up.
Here is the shift that too often stays hidden until a claim surfaces. Under design-bid-build, the owner carried the design and handed you the drawings — you built to them. Under design-build and EPC, you own the outcome of the design, not merely its execution. Delegated design accelerates that transfer: when the architect or engineer of record hands responsibility for a component down to you or your specialty subcontractors, the associated design liability travels with it. Design assist is collaboration and keeps the designer on the hook; delegated design is a transfer of ownership. The distinction is not academic — it decides who answers for the error.
The contract is where that exposure is written, and the language rewards discipline. Watch the standard-of-care clause first. The common-law standard for a design professional is ordinary negligence — the care a reasonably prudent designer would exercise. Many design-build agreements quietly elevate that to a performance warranty or a fitness-for-purpose obligation, promising the finished work will meet the owner's intended use. That is not a subtle edit. A negligence standard is insurable in the ordinary market; an uninsurable warranty of results is a contractual assumption that your professional policy may decline to follow. Design-delegation and indemnity provisions compound it, pulling you into liabilities your subcontractors created.
Now the coverage problem. Your commercial general liability policy was built for construction — bodily injury and property damage arising from your operations. It was not built for design judgment, and it says so. Standard professional-services exclusions, and the designated-professional-services endorsements layered onto contractor programs, carve out claims arising from the rendering of or failure to render professional services. As you assume design responsibility, you assume exposures the CGL is engineered to exclude. The policy that anchors most contractors' programs goes quiet at the precise moment design-build puts you in the designer's chair.
The result is a gap that can leave a contractor uncovered from both directions. Professional services now reach well beyond drawings — supervision, project management, constructability reviews, submittal coordination, value engineering, sequencing. When a loss traces to one of those, the CGL carrier can argue it arose from professional services and decline, while a professional carrier can argue it arose from construction means and methods and decline as well. Two policies, one loss, and the contractor caught in the space between them.
Two products close that space, and they do different work. Contractor's professional liability — the practice program — is your own errors-and-omissions coverage, responding to claims that your professional services, or those you are responsible for, were performed negligently. Contractor's protective professional indemnity, or CPPI, does something distinct: it is first-party protective coverage that indemnifies you for costs driven by the negligence of the design professionals you retain, sitting excess of their policies and providing difference-in-conditions breadth above them. Picture improper rebar sizing that forces $3 million of demolition and rebuild — when the designer's $1 million limit exhausts, protective coverage carries the remaining $2 million rather than draining your balance sheet. It preserves both your capital and your future insurability.
Two enhancements deserve deliberate attention. Rectification, or mitigation-of-damages, coverage funds the cost to correct a discovered design error before it matures into a third-party claim — you fix the defect on your runway rather than litigate the collapse. And because protective and professional forms frequently exclude the cost to correct faulty workmanship and may exclude means-and-methods exposure, the carvebacks and exclusion deletions you negotiate at submission determine whether the policy performs when it is needed.
Structure is the last strategic decision. A practice program follows your firm year to year across a book of work and leverages a shared limit. Project-specific professional liability dedicates a limit to a single venture on a primary basis — the intentional choice for the large, concentrated design-build project whose risk, contract terms, and required limits stand apart from your ordinary portfolio. One controls cost across a steady pipeline; the other isolates the outlier before it contaminates the whole program.
This is precisely the terrain our 4-Step Strategic Process is built to illuminate. Strategic Discovery surfaces where design responsibility actually sits across your contracts. Risk Assessment measures the gap between your obligations and your current program. Solution Design closes it with the right combination of professional, protective, rectification, and project-specific limits. Ongoing Optimization keeps that structure aligned as your book of design-build work grows. The delivery method has already moved. Your coverage should move with intention, not after the loss.
Sources: DBIA — New Design-Build Research Shows Continued Growth + Opportunities to Mitigate Market Challenges; FMI Corp — DBIA Design-Build Utilization Study; Insurance Journal — Snapshot: Environmental and Construction Professional Liability Insurance Market (July 2026); NFP — Construction Professional Liability and CGL Coverage Gaps; IRMI — Understanding Contractor's Protective Insurance; IRMI — Project-Specific Professional Liability for Design-Build Projects; McGriff — Delegated Design in Construction: Liability Risks for Contractors; Chambers and Partners — Construction Law 2026 (USA) Trends and Developments
— Ryan Mefford, President & Risk Advisor