Resource · Commissioning 101
Commissioning (often shortened to "Cx") is a quality-assurance process that verifies a building's systems are designed, installed, and actually perform the way the owner intended — from the earliest design decisions through the first year of occupancy. Think of it as an independent check that the building delivers what was promised.
A commissioning authority (also called a commissioning agent, or CxA) is an independent set of eyes working for the building — and the owner. Rather than designing or installing the systems, the CxA verifies them. That means capturing the Owner's Project Requirements, reviewing the design and contractor submittals against them, witnessing functional performance testing, tracking every issue found to resolution in a log, and handing over a systems manual, operator training, and a final report. The value is independence: the CxA has no incentive except getting the building right.
Document the Owner's Project Requirements and set up the commissioning plan and scope.
Review the design and Basis of Design against the owner's requirements — catching issues while they're cheap to fix.
Review submittals, observe installation, and track issues as systems go in.
Functional performance testing — proving each system does what it's supposed to under real operating conditions.
Systems manual, operator training, and a post-occupancy review (often around 10 months) to confirm everything still performs.
Beyond the fact that it's often required by energy code, LEED, or a federal agency, commissioning pays for itself: it catches design and installation problems before they become warranty callbacks, reduces energy use, smooths the punch-list and turnover, and — most importantly — gives the owner documented proof the building performs. It typically covers the energy-consuming systems (HVAC, controls, lighting, hot water, and related equipment). For what it costs, see our commissioning cost guide.
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It's an independent quality-assurance process that verifies a building's systems are designed, installed, and perform as the owner intended — from design through the first year of occupancy.
A commissioning authority documents the owner's requirements, reviews design and submittals, witnesses functional performance testing, tracks issues to resolution, and delivers a systems manual, training, and a final report — working independently on the building's behalf.
As early as possible — ideally in pre-design, when the owner's requirements are set. Starting early catches issues while they're inexpensive to fix; the earlier the CxA is engaged, the more value commissioning delivers.
No. A code inspection checks minimum compliance at a point in time. Commissioning is a process across the whole project that verifies systems actually perform to the owner's requirements, with functional testing and documentation.
The owner typically funds commissioning as part of the project budget — and utility incentive programs often offset part of the cost. It routinely pays for itself through fewer callbacks and lower energy use.