QA/QC workflows in construction: a practical guide for your field crew

Quality assurance (QA) and quality control (QC) help ensure that construction work follows the design and meets required tolerances. Traditionally, these checks often require a surveyor to be called back to the site.

With Emlid Reach receivers and the Emlid Flow and Emlid Flow 360 ecosystem, field teams can perform many QA/QC workflows themselves—quickly comparing plans versus actuals, catching issues early, and keeping the project moving without delays.

QA/QC workflows in construction: main differences

Although the terms are often used together, they serve different purposes. Quality assurance focuses on preventing errors, while quality control focuses on verifying results in the field.

Quality assurance defines how a project will maintain accuracy and consistency from the start. It includes establishing control points, verifying coordinate systems, standardizing field procedures, and making sure teams use the correct project data.

Many construction projects formalize these processes in a Project Quality Plan (PQP). By setting these rules early, QA helps reduce the risk of positioning errors during construction.

Quality control occurs during and after construction. It involves checking that installed work matches the design—verifying layout points, confirming elevations, and inspecting utilities before capturing as-builts.

These checks help ensure that construction work follows the design and that positioning errors are detected early.

When QA/QC workflows are weak or missing, mistakes may go unnoticed until construction has already progressed. Fixing those mistakes later can lead to expensive rework and delays.

Strong QA/QC practices help teams:

• Ensure all stages proceed smoothly, one after another, without delay.
• Detect positioning errors early.
• Maintain project tolerances.
• Reduce costly corrections later in the project.

The hidden QA/QC bottlenecks in construction projects

Construction projects require major financial investment, tight coordination between many stakeholders, and structures that must remain safe and functional for decades.

Because of this, quality assurance (QA) and quality control (QC) are critical. Without strong QA/QC processes, projects can face structural defects, safety risks, costly rework, delays, and even legal disputes.

Effective quality management helps prevent these issues, protects workers and the public, and ensures the final structure meets required standards. At the same time, it strengthens a company’s reputation and improves long-term profitability.

Quality assurance and quality control are essential for maintaining accuracy on construction projects. However, in practice, they can sometimes slow down field operations.

In most projects, surveyors are responsible for setting up the quality assurance framework. They establish control points and define coordinate systems. Field teams then rely on this setup to carry out construction work.

When verification is needed on site, crews often have to wait for a surveyor to return and confirm the measurements. This can pause work.

Another challenge is that errors may only be discovered after work has already progressed. Surveyors are a limited resource and must support multiple projects under tight timelines.

As a result, not every point can be verified, and teams may rely on visual checks or skip control steps to stay on schedule. This increases the risk that positioning errors go unnoticed until later stages, when corrections become costly and time-consuming.

To reduce this risk, teams can delegate routine quality control to field crews, while surveyors focus on critical measurements. This approach maintains accuracy without slowing down the project.

As a result, many QA/QC tasks remain dependent on surveyors and specialized workflows. Routine checks that could take minutes may instead delay work on site, creating a bottleneck in the construction process. With Reach receivers, Emlid Flow, and Emlid Flow 360, quality assurance becomes part of the daily construction workflow rather than a separate process.

Related reading: Zero rework: how construction subcontractors win with GNSS

Building a reliable project framework

Quality assurance in construction starts with a clear and structured framework. With Emlid, all key elements are in place to ensure consistent and reliable project delivery:

• Survey-grade GNSS receivers: Reach receivers deliver survey-grade accuracy that meets construction tolerances, ensuring reliable, repeatable results on every job. Tilt compensation enables accurate point collection even when the pole is not perfectly vertical, helping maintain centimeter-level accuracy and speeding up fieldwork.
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• A single, scalable environment with automatic sync between office and field: Emlid Flow and Emlid Flow 360 are two integrated components of the same ecosystem, designed to connect fieldwork with office workflows. Emlid Flow is a mobile app used in the field to work with survey data and control GNSS receivers in real time.
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  Emlid Flow 360, on the other hand, is a cloud-based platform where project data is stored, managed, and shared. Together, they enable seamless data synchronization between the field and the office, ensuring that all team members have access to up-to-date information without the need for manual file transfers.
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  Project setups can be standardized using presets. It means you can configure a project once and reuse it across the team. Each item is linked to its author, ensuring traceability and preventing duplication.
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• Verified coordinate system registry with localization support Projects can be set up in the required coordinate system and adjusted to site conditions through localization. You can import existing localization parameters through Emlid Flow 360 or get a localized version in Emlid Flow using control points. This ensures that all measurements align with the project grid and real-world conditions.

Together, Emlid Flow 360, Emlid Flow, and Reach receivers create a structured workflow: project data is prepared in the office, measurements are verified in the field, and results are reviewed across the team.

This helps construction crews maintain accuracy, detect potential issues early, and keep work moving without unnecessary delays.

Streamlined quality control with Reach receivers and Emlid Flow

Quality control ensures that field-collected measurements align with the project design and meet accuracy requirements. With Reach receivers and Emlid Flow, construction teams can quickly compare field measurements with design models and identify discrepancies before work progresses.

This way, instead of waiting for a surveyor, crews can check control points, confirm layout, and validate measurements themselves:

Align the project to reality with control checks

Field crews can remeasure control points to verify that the project setup is correct and that all work is aligned with the design. In construction, even small positioning errors can lead to costly rework, misaligned structures, or delays.

By comparing measured coordinates with expected values, crews can quickly confirm that the coordinate system, localization, and corrections are properly configured.

If the difference is within the project’s tolerance, the control point is considered reliable. If not, it signals a potential issue—such as an incorrect setup, shift in coordinates, or problems with corrections—that needs to be resolved before continuing work.

This step is essential because it ensures that all layout, stakeout, and measurements are based on accurate references, reducing the risk of errors propagating throughout the project.

Catch errors early with spot checks

During the process, site conditions can change, and small errors can accumulate over time. By periodically remeasuring selected points and checking grades with Emlid Flow, crews can confirm that positioning and elevations remain accurate throughout the project.

This helps detect shifts in control, setup errors, grade deviations, or construction discrepancies before they affect larger areas. Regular spot checks reduce rework, keep structures within tolerance, and maintain compliance with design specifications.

Using Reach receivers with the Emlid Flow and Emlid Flow 360 apps allows teams to:

• Reduce downtime waiting for survey verification.
• Detect positioning errors earlier.
• Maintain consistent accuracy on site.
• Improve coordination between survey and construction teams.

Instead of relying entirely on a single specialist, crews can verify measurements independently on-site. Learn more about Emlid Flow workflows in our documentation.

Take control of QA/QC with Emlid

QA/QC is essential for maintaining accuracy in construction projects, but it shouldn’t slow down field operations. With Reach receivers and the Emlid Flow and Emlid Flow 360 ecosystem, construction teams can perform many verification tasks directly in the field while maintaining professional-level accuracy.

Equipped with Reach and Emlid Flow, crews confirm measurements, detect issues early, and keep projects moving efficiently.