Most contractors assume professional liability is for architects and engineers. That was a reasonable assumption twenty years ago. The way projects are delivered now, a contractor can carry design responsibility without ever stamping a drawing.

How contractors picked up design risk

Design-build, design-assist, integrated project delivery, and construction-manager-at-risk arrangements all move work that used to sit with the design team onto the contractor's side of the contract. The contractor hires or coordinates the designers, contributes to constructability and value engineering, and signs a contract that makes them answerable for the result.

Delegated design does the same thing on ordinary hard-bid jobs. Fire protection layout, curtain wall, precast connections, structural steel connections, mechanical and electrical systems — trades are routinely handed a performance specification and told to engineer the solution. That is professional services, performed by a subcontractor, on the contractor's contract.

What the coverage responds to

Contractors professional liability covers claims alleging a negligent act, error, or omission in professional services performed by the contractor or by anyone acting on the contractor's behalf. In practice:

  • A design-build project where a design error produces structural or system failure
  • A specification error that forces rework and delays the schedule
  • Construction management services — scheduling, sequencing, coordination — done negligently
  • Delegated design performed by a subcontractor whose work the contractor is responsible for
  • Failure of a system to meet a performance standard the contract guaranteed, including energy and sustainability targets

Why general liability does not cover it

Two reasons, and they stack. First, most CGL policies carry a professional services exclusion. Second, even without it, the CGL responds to bodily injury and property damage. A design error that causes months of delay and millions in rework may produce no bodily injury and no damage to anyone's property — just economic loss, which the CGL was never built for.

Where the design sub's policy runs out

A common answer is "my design sub carries professional liability, so I am fine." Sometimes. But the sub's limit may be $1,000,000 on a problem that costs $4,000,000 to fix, the policy may have lapsed or been written claims-made with a retro date after the work, and the sub may have dissolved by the time the defect shows up — which in construction is frequently years later.

That gap is what contractors protective professional indemnity addresses. It is first-party coverage: it reimburses the contractor's own damages when a design professional's error causes a loss that exceeds the designer's available limit. Different product from CPL, and the two are often bought together on large design-build work.

Rectification coverage is the underrated part

Some contractors professional forms include rectification, sometimes called mitigation. It pays the cost of correcting a discovered design error before it becomes a claim or causes damage. Find the error at 40% complete and fix it for $200,000 instead of litigating a $2,000,000 failure two years after handover. For a contractor, this is often the feature that justifies the premium on its own.

How it is structured

  • Practice policy — covers all the contractor's work during the policy period. The default for a firm doing design-build regularly.
  • Project-specific policy — a dedicated limit for one project, often for a defined term plus an extended reporting period covering the discovery years after completion. Owners on large jobs frequently require this.
  • Written claims-made, so the retroactive date and tail matter as much as the limit

Which contractors should be asked about it

Anyone doing design-build or design-assist, any GC delivering under CM-at-risk, mechanical and electrical contractors taking delegated design, and specialty trades that engineer their own systems — fire protection, curtain wall, precast, structural steel, controls. Also worth asking any contractor who has signed a contract with a performance guarantee in it, whether or not they think of themselves as doing design work.

Related: CGL vs. professional liability · Tail coverage explained

Educational only — confirm against the actual policy form, the construction contract, and the certificates on file.