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Project Managementaka: Cxaka: building commissioningaka: CxA

Commissioning

In Plain English

A testing and verification process to confirm all building systems work correctly before the owner moves in.

Definition

Commissioning is a systematic quality assurance process that verifies all building systems (mechanical, electrical, plumbing, controls, life safety) are designed, installed, tested, and calibrated to operate as the owner intended. Fundamental commissioning is required by energy codes such as ASHRAE 90.1 and LEED. A commissioning authority (CxA) oversees the process from design through occupancy.

Why It Matters in Bidding

Commissioning is a defined scope line on many commercial and public projects, so estimators must clarify whether the CxA fee, contractor support hours, and functional testing labor sit in the GC's bid or are owner-furnished. Underestimating the field time MEP subs spend supporting functional tests is a common margin leak, and late or incomplete commissioning can delay substantial completion and trigger liquidated damages.

Example

During scope review, a GC's estimator adds line items for HVAC controls testing support and as-built coordination after noticing the spec requires fundamental commissioning by an independent CxA before occupancy.

Related Terms

TurnoverProject CloseoutCertificate of OccupancyConstruction Administration

Frequently Asked Questions

The owner usually contracts the commissioning authority directly, but the contractor still bears cost for trade labor to support functional testing, deficiency corrections, and documentation. Estimators must read the spec to split these responsibilities; assuming the owner covers all commissioning cost can leave significant trade support hours unpriced in the bid.
Commissioning happens late in the build and gates substantial completion, so functional testing and deficiency rework must be sequenced into the schedule. If estimators don't reserve float and crew hours for retesting, commissioning findings can push closeout past the contract date and expose the GC to liquidated damages.
Standard testing confirms a single device or system functions, while commissioning is a structured, third-party-verified process checking that integrated systems meet the owner's project requirements across all operating modes. It includes design review, installation checks, functional performance testing, and training, generating more documentation and trade coordination than routine startup.

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