What type of Cx typically occurs for a building renovation?

• A. New construction Cx for all systems
• B. Cx limited to the systems or portions being modified or replaced
• C. Only energy performance tests
• D. Cx excludes interface with new work

Answer: (B)

In a renovation, the commissioning approach is to verify and validate only what is changing. The focus is on the systems or portions being modified or replaced, ensuring they perform as intended and interface correctly with the existing, unchanged portions of the building. This scoped approach is cost- and risk-effective, aligning with how renovations typically unfold, where full re-commissioning of every system would be unnecessary and impractical. While energy performance testing can be part of the process, it doesn’t by itself cover the full verification of operability and control sequencing for the modified systems. Also, you wouldn’t skip checking how the new work interfaces with the rest of the building, since integration is essential to prevent issues after turnover.