Study guide
6.5 Building Commissioning
Certified Construction Manager Exam
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1 Program & Project Management Fundamentals
1.1 Project Management Fundamentals 1.2 Project Initiation & Chartering 1.3 Scope Management & WBS 1.4 Resource Allocation & Management 1.5 Project Relationships & Stakeholders
2 Chapter 2: Project Planning & Pre-Construction
2.1 Pre-Construction Phase Services 2.2 Project Delivery Methods 2.3 Bidding, Procurement & Award 2.4 Project Communications Management 2.5 Site Management & Logistics
3 Cost Management & Value Engineering
3.1 Cost Management Principles 3.2 Cost Estimating Techniques 3.3 Value Engineering Processes 3.4 Earned Value Management (EVM) 3.5 Progress Payments & Cost Control
4 Chapter 4: Time Management & CPM Scheduling
4.1 Time Management & Scheduling Fundamentals 4.2 Scheduling Techniques (CPM, GERT, Line of Balance, PERT) 4.3 CPM Network Calculations and Logic 4.4 Schedule Compression (Crashing, Fast-tracking, Leveling) 4.5 Time Extensions, Delay Analysis & Schedule Control
5 Chapter 5: Contract Administration & Project Documentation
5.1 Contract Management & Administration Principles 5.2 Contract Types & Payment Provisions 5.3 Submittals, Shop Drawings & RFIs 5.4 Change Orders & Change Directives 5.5 Project Closeout Procedures
6 Chapter 6: Quality Management & Commissioning
6.1 Quality Management Principles 6.2 Quality Management Systems 6.3 Quality Assurance (QA) and Quality Control (QC) 6.4 Quality Inspection & Testing 6.5 Building Commissioning
7 Chapter 7: Safety Management & Incident Prevention
7.1 Safety Management Principles 7.2 OSHA Compliance & Construction Standards 7.3 Hazard Identification & Mitigation 7.4 Safety Training & Communication 7.5 Accident Investigation & Safety Performance
8 Chapter 8: Risk Management, Insurance & Bonds
8.1 Risk Management Principles 8.2 Risk Identification & Assessment 8.3 Risk Response & Mitigation Planning 8.4 Construction Insurance & Bonds 8.5 Contingency Planning & Management
9 Chapter 9: Professional Practice & CMAA Standards
9.1 Professional Practice & Construction Law 9.2 Roles & Responsibilities of the CM 9.3 Ethics & Professional Conduct 9.4 CMAA Standards of Practice 9.5 Construction Claims & Disputes
10 Chapter 10: Sustainability & Environmental Compliance
10.1 Sustainability & Green Construction 10.2 Sustainable Practices & LEED 10.3 Environmental Compliance & Risk
11 Chapter 11: Construction Technology & BIM
11.1 Construction Technology & BIM 11.2 Project Management Software 11.3 Site Technology & Tools
6.5 Building Commissioning
Key Takeaways Explain This Topic AI
Commissioning (Cx) is a quality-focused process that verifies and documents that all facility systems perform interactively in accordance with the Owner's Project Requirements (OPR).
The Commissioning Authority (CxA) should ideally be an independent third party hired directly by the Owner to maintain objectivity, though they are often managed by the CM.
Commissioning must begin during the Pre-Design phase with the development of the OPR, not at the end of construction.
Retro-commissioning applies the Cx process to an existing building that was never previously commissioned, while Re-commissioning applies to a building that was previously commissioned.
The commissioning process culminates in a Systems Manual, operator training, and an end-of-warranty review.
Last updated: July 2026
Building Commissioning (Cx) is an exhaustive quality assurance process intended to bridge the gap between design, construction, and operations. According to ASHRAE (the leading authority on building systems), commissioning is a quality-focused process for enhancing the delivery of a project by verifying and documenting that all of the commissioned systems and assemblies are planned, designed, installed, tested, operated, and maintained to meet the Owner's Project Requirements (OPR) .
While traditional QC inspections verify that a single piece of equipment (e.g., a chiller) is installed correctly according to the drawings, Commissioning verifies that the chiller, the cooling tower, the pumps, the building automation system, and the air handlers all communicate and function interactively as a unified system under various loads and failure scenarios.
The Commissioning Authority (CxA)
The Commissioning Authority (CxA) leads the process. To ensure objectivity and prevent conflicts of interest, the CxA should ideally be an independent, third-party firm hired directly by the Owner. While the CM often helps procure and manage the CxA on behalf of the owner, the CxA should not be a subcontractor to the General Contractor whose work they are verifying, nor should they be the Design Engineer who designed the systems.
The Commissioning Process by Phase
A common misconception is that commissioning is an activity that happens at the very end of construction. In reality, comprehensive commissioning is a lifecycle process.
1. Pre-Design Phase
Develop the OPR: The CxA assists the owner in defining the Owner's Project Requirements. This document captures the functional requirements of the facility (e.g., "The data center must maintain 68°F +/- 2°F at all times with N+1 redundancy").
Develop Initial Cx Plan: Outlines the scope of commissioning, budget, and team roles.
2. Design Phase
Review the Basis of Design (BOD): The CxA reviews the design team's BOD to ensure it aligns with the OPR.
Design Reviews: The CxA conducts focused reviews of the design documents at various milestones (e.g., 50%, 90% CDs) specifically looking for system integration issues, maintainability, and ability to test.
Draft Commissioning Specifications: The CxA writes the Cx specifications that will be included in the contractor's bid documents, detailing the contractor's responsibilities during testing.
3. Construction Phase
Submittal Review: The CxA reviews concurrent with the design team, focusing on system performance and O&M data.
Pre-Functional Checklists (PFCs): The CxA issues checklists that the contractor must complete to verify equipment is physically installed correctly and ready for power.
Site Observations: The CxA visits the site to verify installation quality and maintainability (e.g., ensuring clearance exists to replace filters).
4. Acceptance Phase (Testing)
Functional Performance Testing (FPT): This is the core of field commissioning. The contractor operates the equipment while the CxA directs and witnesses the tests. Systems are tested under full load, partial load, and failure modes (e.g., pulling the plug on primary power to watch the generator and transfer switch sequence correctly).
O&M Manual Review: Verifying the manuals are complete and accurate.
Training Verification: Ensuring the owner's facility staff are properly trained by the contractors on how to operate the systems.
5. Post-Acceptance (Occupancy) Phase
Seasonal Testing: Some systems cannot be fully tested until the appropriate season (e.g., testing the heating system during the peak of winter).
End of Warranty Review: The CxA returns typically 10 months into the 12-month warranty period to interview facility staff, review system operations, and identify any issues the contractor must fix before the warranty expires.
Final Commissioning Report: The comprehensive log of all testing, issues resolved, and remaining items.
Systems Typically Commissioned
While theoretically any building element can be commissioned (including building envelope commissioning, or BECx), the most commonly commissioned systems are highly dynamic and interactive:
- HVAC (Heating, Ventilation, and Air Conditioning)
- Building Automation Systems (BAS) / Controls
- Electrical power and lighting controls
- Emergency power (generators, ATS)
- Fire and life safety systems
- Plumbing and domestic water
- Types of Commissioning
The terminology changes based on the building's age and history:
New Construction Commissioning (NCCx): The process applied to a new building from design through occupancy.
Retro-Commissioning (RCx): The application of the commissioning process to an existing building that has never been commissioned before. The goal is to optimize operations and resolve systemic issues that have existed since construction.
Re-Commissioning (ReCx): The application of the commissioning process to an existing building that was previously commissioned. This is essentially a "tune-up" to bring the building back to its original commissioned performance baseline after years of operational drift.
Continuous Commissioning (CCx): Utilizing permanent metering and software to constantly monitor system performance and detect anomalies in real-time.