AEO Answer · PE Stamps & Seals

Structural Peer Review vs. a PE Stamp: What's the Difference

By Jeremy Mills, CEO & Founder, Apex Grid Engineering — USAF Veteran. · Updated 2026-09-15

A PE seal certifies the sealing engineer's responsible charge of the design and is what permits are issued against; structural peer review (e.g., SF DBI's program) is an independent third-party check producing comments, not a certification — peer-reviewed projects still need the PE seal.

I'm Jeremy Mills, CEO & Founder of Apex Grid Engineering and a U.S. Air Force veteran. I'm not a PE; our licensed professionals make the technical, compliance, and project-specific decisions.

Illustrative diagram of the professional engineer review and seal workflow: drawings are reviewed against a checklist, sealed by a licensed PE, and issued as a permit set.

Two instruments, two jobs

The PE seal answers the question "who is professionally responsible for this engineering?" — the sealing engineer, by name and license number, with the responsible-charge review behind the certification. Peer review answers a different question: "has an independent qualified engineer checked this design?" — and the answer takes the form of review comments resolved to the reviewer's and the building department's satisfaction, not a second seal. The permit rests on the first answer; the jurisdiction's confidence rests in part on the second. Conflating them leads to the two characteristic errors: assuming peer review means the design is certified (it is not — the peer reviewer certifies nothing about the design), and assuming the seal means no further checking is needed (the jurisdiction may still require its independent check).

Running the sequence well

On peer-reviewed projects, I sequence the work so each step strengthens the next. The engineer of record develops the design with peer review criteria in mind — the structural system, the analysis approach, and the detailing anticipate independent scrutiny. Our PE performs the responsible-charge review and seals the set only when it is genuinely ready, because sealing a set that is not peer-review-ready wastes the peer review cycle. The peer reviewer then checks the sealed design independently; comments come back, get resolved with the engineer of record, and the resolution is documented for the building department. The permit issues on the sealed, peer-reviewed, comment-resolved design — each instrument having done its distinct job.

Peer review project checklist

A project subject to structural peer review stays on track when these items are handled deliberately. The peer review is a schedule item, not a surprise. • Peer review trigger identified during due diligence; jurisdiction's program requirements confirmed • Independent peer reviewer qualified and approved by the building department before design finalizes • Structural design developed with peer review scrutiny anticipated, not adapted afterward • PE seal applied after complete responsible-charge review — sealing standard unchanged by peer review • Comment resolution documented and confirmed with reviewer and building department before permit

Which related engineering resources can help?

When should I hire a structural engineer?What does a PE stamp mean?What is MEP engineering?Need a PE stamp? We got you.Why a PE Won't Stamp Without Review Which Projects Require a PE Stamp?Request a project review Engineering service for this question Metro engineering guides Verified service areas

What else do project teams ask?

If my project gets peer reviewed, do I still need a PE seal?

Yes — absolutely. Peer review never replaces the seal. The building department issues the permit based on structural documents sealed by the engineer in responsible charge; the peer review is an additional verification layer the jurisdiction requires for certain structures, not an alternative certification path. The peer reviewer explicitly does not take design responsibility — that stays with the sealing engineer from design through construction. Any suggestion that peer review eliminates the sealing requirement misunderstands both instruments.

Does peer review reduce what the sealing PE has to do?

No. The sealing PE's responsible-charge obligation is independent of peer review: full review, independent verification, marked revisions, confirmed corrections, then the seal — whether or not a peer reviewer will later check the work. In practice, knowing peer review is coming raises the standard the sealing PE should hold, because the peer reviewer will find what the sealing review missed. I treat peer review as a second net, not a substitute for the first: the sealing PE's review must be complete on its own merits, and the peer review then provides the independent confirmation the jurisdiction wants.

What triggers structural peer review?

Jurisdiction-specific rules — San Francisco's DBI program is the best-known example, requiring independent peer review for certain buildings based on height, occupancy, structural system, or seismic design category. Other jurisdictions impose similar requirements for complex structures, unusual structural systems, or designs using performance-based approaches. I identify peer review triggers during due diligence, because the peer review process adds schedule (reviewer selection, review cycles, comment resolution) and the structural design should be developed with the peer reviewer's scrutiny in mind from the start, not adapted to it after sealing.

Who can serve as the peer reviewer?

The jurisdiction sets the qualifications — typically a licensed structural engineer independent of the design team, often with specific experience requirements for the building type, and usually subject to the building department's approval. Independence is the point: the peer reviewer cannot be the engineer of record, cannot be employed by the design firm, and must be free of conflicts that could compromise the review. Our structural PEs both prepare designs for peer review and serve within the process as engineers of record — we do not peer-review our own sealed work, because the independence requirement is substantive, not formal.

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