the commissioning ladder: FAT → SAT → pre-functional → functional → Integrated Systems Test (IST)
L1–L5observed
| Value kind | observed — Reported measurements, counts, and specifications keep the precision and scope stated by their source; an exact specification is not treated as a range. |
|---|---|
| Scope | Industry commissioning convention, not a standard; programs vary (some add a Level 0 design review or a Level 6 seasonal stage). ASHRAE Guideline 0 and 1.1 define the commissioning process, not the level numbering. |
| As of | 2025 |
| Source | Construct & Commission; BMP MEP; CxPlanner |
| Review | checking…review by 2027-04-14 · fast cadence |
| Recorded changes | last 2026-07-21 · 2 revisions tracked |
| Claim id | the-commissioning-ladder-fat-sat-pre-functional |
Where the guide uses it
- 4.12 Metering, Power Quality, Monitoring & Electrical Operations
- 5.11 Thermal Design, Reliability, Leak Detection & Commissioning
- 13.1 Commissioning Fundamentals, Levels & Program Governance
← Full numbers register — every date-stamped figure in the guide, with revision history.