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What Is a Peer Review in Structural Engineering and When Is It Required?

Imagine a project where a single miscalculated lateral load leads to an inadequate seismic system, and the error is not caught until construction is well underway. The cost of correcting that mistake in the field can be many times the cost of catching it on paper. This is precisely the risk a structural peer review is designed to eliminate. A peer review is an independent technical evaluation of a structural design performed by a qualified engineer who was not part of the original design team. It is one of the most effective quality assurance tools available in structural engineering, yet many owners, developers, and even contractors are unclear about what it involves and when it becomes mandatory. This article explains what a structural peer review is, how it differs from a standard plan check, who is qualified to perform one, and the specific situations where building codes, jurisdictions, and prudent risk management call for one. JMVC Consulting Structural Engineers performs and coordinates peer reviews across a range of building types, and the goal here is to give you a clear, practical understanding of the process.

What a Structural Peer Review Actually Is

A structural peer review is an independent check of the engineering behind a project. The reviewer examines the structural calculations, the analysis model, the load assumptions, the lateral force resisting system, the connection design, and the drawings, then evaluates whether the design satisfies the governing code and sound engineering practice. The reviewer does not redesign the structure. The responsibility for the design remains with the engineer of record. Instead, the reviewer provides a second set of experienced eyes to confirm that the design is safe, code compliant, and internally consistent.

Peer reviews vary in depth. A limited review may focus only on the seismic force resisting system or on a specific element of concern, such as a transfer girder or a complex foundation. A comprehensive review covers the entire structural system, including gravity loads, lateral loads, load paths, and detailing. The scope should always be defined in writing before the review begins, so the owner, the engineer of record, and the reviewer share the same expectations. A well structured review produces a formal comment log, the engineer of record issues responses, and the two parties resolve each item until the reviewer is satisfied.

Peer Review Is Not the Same as a Plan Check

Owners often assume that the building department plan check already provides an independent review, so a separate peer review is redundant. This is a misunderstanding worth correcting. A plan check confirms that a submittal meets the minimum administrative and code documentation requirements for a permit under the International Building Code, including the duties of the building official described in IBC Section 104. Plan checkers work under time and staffing constraints and generally verify that required information is present and that obvious code provisions are addressed. They rarely rebuild the analysis model or independently verify every calculation.

A peer review, by contrast, is a deeper technical audit performed by a practicing structural engineer with expertise in the specific structural system. The reviewer interrogates the assumptions behind the numbers. Are the seismic design parameters from ASCE 7 correct for the site? Is the load path complete and continuous from the roof to the foundation? Are the drift limits satisfied? Are the connections capable of developing the required forces? These are questions a plan check may not reach. The two processes are complementary rather than interchangeable, and on complex or high risk projects, both are necessary.

When Building Codes Require a Peer Review

For most conventional buildings, the model codes do not mandate an independent peer review, and the decision rests with the owner or the jurisdiction. However, there are clear cases where review is codified. When a structure uses a seismic isolation system, ASCE 7-22 Chapter 17 requires an independent design review of the isolation system and the structure by a team that did not participate in the original design. Similarly, structures incorporating supplemental damping systems fall under ASCE 7-22 Chapter 18, which also calls for independent design review. These provisions exist because isolation and damping technologies rely on specialized analysis that carries a higher consequence of error.

Performance-based seismic design is another trigger. When an engineer designs a structure using alternative means and methods rather than the prescriptive provisions of the code, most jurisdictions require an independent peer review panel to validate the approach. Guidelines such as the Pacific Earthquake Engineering Research center Tall Buildings Initiative formalize this expectation for tall buildings designed outside the prescriptive height limits of ASCE 7. In these cases, the peer review is not optional, and the design cannot be approved without it.

When Jurisdictions and Prudence Call for a Review

Beyond the codified cases, many local jurisdictions impose their own peer review requirements. Cities in high seismic regions, including several in California, require independent review for buildings above certain heights, for structures using nonprescriptive lateral systems, or for essential facilities. Hospitals and certain healthcare facilities reviewed under state agencies frequently require an independent structural review as part of their approval process. Always confirm the specific requirements with the authority having jurisdiction early in the project, because a late discovery of a review requirement can delay a permit significantly.

Even where no rule applies, a peer review is often the prudent choice. Projects with irregular geometry, large transfer conditions, long span systems, unusual foundations, or high occupancy loads carry elevated risk. So do fast tracked projects where design and construction overlap. In these situations, the modest cost and schedule impact of a review is small compared to the exposure created by an undetected error. An independent review also strengthens the design record, which is valuable if a project is later scrutinized. For an engineer of record, a clean peer review is a mark of confidence, not a criticism.

How a Peer Review Fits Into the Project Schedule

The most effective peer reviews begin early. When a reviewer is engaged during the design development phase, fundamental issues with the structural system or the analysis approach can be corrected before the drawings are substantially complete. Waiting until the construction documents are finished means any significant comment forces expensive rework. For performance-based designs, the review typically runs in parallel with the design in defined stages, from the basis of design document through the final analysis. Coordinating the review timeline with the overall project schedule is a task JMVC handles routinely, and it is central to keeping a review from becoming a bottleneck.

Conclusion

A structural peer review is an independent, expert evaluation that confirms a design is safe, code compliant, and sound before it is built. It is distinct from a building department plan check, and it is mandatory in specific situations, including seismically isolated structures under ASCE 7-22 Chapter 17, damped structures under Chapter 18, performance-based designs, and many jurisdiction specific cases such as tall buildings and essential facilities. Even when it is not required, a review is often the wise choice for complex or high risk projects. If you are planning a project and are unsure whether a peer review applies, or if you need a qualified independent reviewer, contact JMVC Consulting Structural Engineers. We can clarify the requirements, define an appropriate scope, and help protect your project from costly and avoidable errors.