How should the Cx process handle design changes during construction?

• A. Update only the drawing, leave procedures.
• B. Delay all tests until after occupancy.
• C. Ignore changes to avoid rework.
• D. Update OPR/BOD as needed, revise test procedures, and re-test impacted systems; re-signoff if required.

Answer: (D)

When design changes occur during construction, the commissioning process must adapt by updating the owner’s requirements and design translation to reflect the new intent, then revalidating performance. Specifically, you should revise the OPR (Owner Project Requirements) and the BOD (Basis of Design) to capture what changed and how it affects desired outcomes. Next, adjust the test procedures and acceptance criteria to align with the updated design, then re-test the impacted systems to verify they still meet the owner’s goals. Finally, re-signoff may be required to document that the building still satisfies the owner’s requirements after the changes. This approach keeps design, testing, and verification in sync and ensures accountability, rather than leaving documentation stale, delaying verification, or ignoring changes that could compromise performance.