Field

What is quality assurance in construction?

Quality assurance (QA) is the planned system of procedures, responsibilities, and checks that gives confidence a project will meet its requirements. It is about the process, while quality control checks the work itself.

Two construction professionals review paper plans beside a tablet at a jobsite workbench.
Plan reviews connect field conditions, drawings, and the next decisions on a job. AI-generated illustration.

Quality assurance is the management side of quality. It sets up how quality will be achieved: who reviews submittals, what gets inspected and when, which tests are required, how problems are recorded, and how the process is audited. Quality control is the hands-on part, the actual inspecting, testing, and fixing. A simple way to remember it: QA is the plan and the checking of the system, QC is the checking of the work.

In practice the terms get blended, and many contracts say "QA/QC." But the distinction matters when a contract assigns QA to one party, often the owner or its consultant, and QC to the contractor.

What a QA program includes

  • A written quality plan for the project or the company.
  • Clear roles: who is the quality manager, who can stop work, who signs off inspections.
  • Procedures for submittals, mock-ups, and first-installation reviews.
  • An inspection and test plan tied to the specifications.
  • A nonconformance report process with root-cause review.
  • Training for supervisors and subs on the plan.
  • Periodic audits to confirm the procedures are being followed.

Some owners require more. On federal contracts, FAR 46.202-4 lets agencies require compliance with higher-level quality standards when needed, and it lists ISO 9001 among the examples of overarching quality management system standards. Most building contractors never see that requirement, but it is common in some federal, energy, and industrial work.

How QA works on a real job

Say a GC has had two roof leaks on recent projects, both traced to flashing details at curbs. The company's quality manager makes a QA change, not just a fix. The roofing scope now requires a mock-up of a curb flashing on every job, reviewed by the superintendent and the roofing manufacturer's rep before the roof proceeds. The inspection checklist adds a photo of every curb before the cap goes on. The quality manager audits three jobs in the next quarter to confirm the photos exist.

None of that is inspecting a particular roof. It is changing the system so the inspections catch the problem every time. That is quality assurance.

The same thinking applies to subcontractors. A QA program can require each major sub to submit its own inspection checklist before mobilizing, then the GC audits a sample of those checklists during the job. The sub stays responsible for its work, and the GC has evidence that the system is running.

Common mistakes

  1. A quality plan that lives in a binder no one opens. QA only works if the field uses it.
  2. Making the superintendent the only quality check while also running schedule and safety.
  3. Fixing defects one at a time without asking why they keep happening.
  4. Not flowing quality requirements to subs in their subcontracts and kickoff meetings.

Related terms

See inspection, commissioning, specifications, and defective work.

Frequently asked questions

What is the difference between QA and QC in construction?

Quality assurance is the system and process that makes quality likely: plans, procedures, training, and audits. Quality control is checking the actual work through inspections and tests and fixing what fails.

Who is responsible for quality assurance?

It depends on the contract. Contractors run their own QA programs, and owners often have their own QA through a consultant, inspector, or the architect.

Do small contractors need a QA program?

Yes, but it can be simple: a short checklist for each trade, a habit of mock-ups on critical details, and a monthly look at what went wrong and why.

Is ISO 9001 required for construction?

Not generally. On federal contracts, agencies may require higher-level quality standards such as ISO 9001 when they decide it is necessary, under FAR 46.202-4.

Sources

  1. Acquisition.gov: FAR 46.202-4, Higher-level contract quality requirements
Written and edited by

Maurice Francois writes and edits construction operations guides for Smart Business Automator. More from Maurice on the Scaling Legends podcast.

Get a free assessment