Structural QA/QC Services

What Is Structural QA/QC Review?

Structural qa qc services verify someone else’s structural engineering work rather than produce it. Quality assurance refers to the checks built into a process to prevent errors before they occur. Quality control refers to the inspection that confirms finished calculations, drawings, or built conditions meet the intended standard. ISTA Engineers combines both: a documented check of the engineering, paired with verification that the construction matches the design.

A QA/QC engagement differs fundamentally from a design engagement. ISTA Engineers does not produce the original stamped drawings or calculations when engaged for structural QA/QC. Instead, the engineers independently work through the engineer of record’s design, load paths, and detailing to confirm they hold up. The engineers then compare as-built or in-progress construction against the approved documents. A licensed Colorado Professional Engineer backs the resulting independent opinion on whether the structural work is sound.

Why Do Structural QA/QC Services Matter for Colorado Projects Under the IBC?

Structural errors cost the most to fix after concrete is poured or steel is erected. Independent QA/QC review, performed at the design stage or during construction, verifies that calculations, drawings, and built conditions match the design intent. Early verification keeps problems from becoming permanent and far more costly to correct.

Colorado’s building conditions add specific risk factors that make independent structural QA/QC particularly valuable on projects across the state:

• Expansive soils found throughout much of the Front Range and Denver metro area can generate significant heave forces on foundations and slabs if the geotechnical recommendations were not correctly translated into the structural design; QA/QC review confirms that translation was made correctly.
• Frost depth requirements vary by jurisdiction and elevation across Colorado, and footing and foundation designs need to reflect the local frost line, not a generic assumption carried over from another region.
• Snow and wind load variation by elevation and jurisdiction means a design correct for one Colorado municipality may not be correct for another; an independent reviewer checks that the governing loads used in the calculations match the project’s actual location.
• Jurisdiction-specific amendments to the adopted building code are common across Colorado’s cities and counties, and a QA/QC review confirms the design and construction reflect the specific code amendments enforced by the local building department, not just the base code.
• Seismic detailing requirements, while typically lower than in higher-seismic regions of the country, still apply and are sometimes overlooked in designs adapted from out-of-state templates.

Independent structural QA/QC review catches these region-specific issues early. Catching them early prevents a field problem, a plan review rejection, or, worse, a performance issue after occupancy.

How Do Structural QA/QC Services Work: What ISTA Includes

ISTA Engineers structural QA/QC services can include calculation checks against the structural design, independent peer review of drawings, and field verification comparing built conditions to approved plans. Depending on the project stage and the client’s needs, a QA/QC engagement may include:

• Independent calculation review – working through the engineer of record’s load takedowns, member sizing, and connection design to confirm the numbers hold up and the governing code provisions were applied correctly.
• Drawing set review – checking structural drawings for internal consistency, coordination with architectural and MEP drawings, and completeness of details needed for construction.
• Design intent verification – confirming that the load path shown on paper is complete and buildable, from roof to foundation, with no gaps in the framing or connection details.
• Field verification against approved plans – site visits during construction to confirm that footings, foundations, framing, connections, and steel erection match the approved structural drawings.
• Documented findings – a written report identifying any discrepancies found, organized so the design team or contractor can act on them directly.

Each ISTA Engineers engagement is scoped around what the client actually needs reviewed. An architect preparing to submit for permit may only need a calculation and drawing check. A general contractor mid-construction may need periodic field verification visits tied to milestones, such as foundation placement or steel connections, before later work covers those elements.

How Do Structural QA/QC Services Work at ISTA Engineers?

ISTA Engineers delivers structural qa qc services as an independent, third-party review, separate from the design process itself. The general process typically follows these steps:

• Scope definition – ISTA works with the client to define exactly what needs review: full calculations and drawings, a specific structural system, or field conditions at defined construction stages.
• Document collection – the client provides the calculations, drawings, geotechnical report, and any other design documents produced by the original engineer of record.
• Independent evaluation – ISTA’s licensed engineers perform their own review of the load paths, member design, and code compliance, working independently of the original designer’s assumptions.
• Field observation, where applicable – for construction-stage QA/QC, ISTA visits the site to compare actual conditions against the approved structural drawings.
• Findings report – ISTA documents any discrepancies, open items, or concerns in a clear report the client can route back to the design team or contractor for resolution.

ISTA Engineers serves as the independent checker, not the designer of record. The firm delivers findings objectively, with no incentive to defend a design decision it did not make.

Who Relies on Structural QA/QC Review and Peer Review from ISTA?

Architects request an independent structural check before permit submittal.

General contractors verify that field conditions match the structural design.

Owners and developers add a further layer of quality assurance to a project.

Public agencies and municipalities use ISTA’s structural QA/QC services when approval requires independent structural verification. Lenders and insurers want independent confirmation of structural adequacy before financing or underwriting a project. Design-build teams want an outside check on in-house engineering before permit. In each case, the value is the same: a licensed, independent engineer confirms the structural work holds up, separate from whoever produced it.

Structural QA/QC FAQ