Commissioning starts at the inception of a building project during which phase?

• A. Pre-design phase
• B. Design phase
• C. Construction phase
• D. Post-acceptance phase

Answer: (A)

Starting commissioning early, at the very beginning of the project, is essential. In the pre-design phase, the owner, design team, and commissioning authority establish the owner's project requirements and the basis of design, and outline the commissioning plan, acceptance criteria, and responsibilities. This early planning ensures that performance goals are built into the project from the start, informing equipment selection, control sequences, and system integration so they can be tested and verified as design decisions are made.

Choosing this early phase avoids trying to retrofit performance verification later, which can lead to design changes, added costs, and missed test opportunities. When testing and handover activities are delayed to design, construction, or post-acceptance phases, there’s less room to influence outcomes, and commissioning becomes reactive rather than collaborative.

So, starting in the pre-design phase sets up the Cx process to align with owner goals, secure the required tests and documentation in the contract, and plan for testing and training long before systems are installed, making it the most effective time to begin commissioning.