April 20, 2026
You’ve invested millions into a new commercial building. The mechanical contractor says the systems are installed. The general contractor says the project is done. But how do you actually know everything works the way it was designed to work?
That’s exactly what building commissioning answers.
In this guide, we’ll break down what building commissioning is, why it matters, and what the process looks like for commercial projects in Florida and beyond.
What Is Building Commissioning?
Building commissioning (Cx) is the process of verifying, documenting, and confirming that all building systems, HVAC, electrical, plumbing, controls, and more are installed correctly and operating according to the owner’s project requirements (OPR) and the design intent.
Think of it as a structured quality assurance process. Not a final inspection. Not a contractor’s self-certification. An independent, third-party verification that your building actually performs the way it was designed to.
Commissioning a building is not the same as testing and balancing, though the two often work together. TAB focuses specifically on airflow, pressure, and temperature in HVAC systems. Commissioning is broader; it looks at how all systems integrate and perform together under real operating conditions.
Why Building Commissioning Matters
Without commissioning, building owners often discover system problems the hard way through uncomfortable occupants, unexpectedly high energy bills, failed inspections, or equipment failures that could have been prevented.
A study by Lawrence Berkeley National Laboratory found that commissioned buildings use an average of 13% less energy than those that skipped the process. In large commercial buildings, that translates directly into real dollars saved every year.
Beyond energy, commissioning protects building owners in several critical ways:
- Ensures systems meet energy code requirements, including compliance with ASHRAE 90.1 and Florida’s energy standards
- Supports LEED certification and other green building programs
- Reduces warranty claims and callback costs
- Provides documented proof of system performance for liability and insurance purposes
- Catches design and installation errors before they become expensive problems
Who Needs Building Commissioning Services?
Building commissioning services are typically required or strongly recommended for:
- New commercial construction projects over a certain square footage threshold
- Buildings pursuing LEED, FGBC, or other energy certification
- Healthcare and educational facilities with strict ventilation requirements
- Government and institutional buildings subject to public procurement standards
- Renovation or retrofit projects where existing systems are being significantly modified
In Florida, commissioning requirements have expanded significantly in recent years. Many commercial projects now require independent third-party commissioning as a condition of a certificate of occupancy or compliance with ASHRAE 90.1 and related energy codes.
What Does the Building Commissioning Process Look Like?
The commissioning process begins long before construction ends, and that’s intentional. Here’s a high-level overview of what a full commissioning scope includes:
1. Pre-Design and Design Phase
A commissioning firm reviews the owner’s project requirements and design documents early in the process, identifying potential performance issues before they’re built into the structure. This phase sets the foundation for everything that follows.
2. Construction Phase
As systems are installed, the commissioning agent conducts site visits, reviews submittals, and monitors installation quality. Issues identified here are far less expensive to correct than problems found after systems are operational.
3. Functional Performance Testing
This is the heart of the commissioning process. The commissioning firm conducts functional tests on each system — running equipment through its sequences of operation, verifying controls respond correctly, and confirming that systems deliver what the design specified.
4. Documentation and Reporting
A commissioning report documents everything: test results, deficiencies identified, corrective actions taken, and final system performance data. This document becomes a permanent record for the building owner and a reference for future facility management.
5. Post-Occupancy Follow-Up (for Full Cx)
For projects requiring full commissioning, follow-up visits occur after occupancy to verify that systems continue to perform correctly under real-world conditions. This phase is particularly important for complex HVAC systems and buildings with variable occupancy patterns.
New Building Commissioning vs. Retro-Commissioning
New building commissioning applies to construction projects. Retro-commissioning (RCx) applies to existing buildings, particularly those experiencing comfort complaints, rising energy costs, or aging equipment.
Both follow similar principles, but retro-commissioning focuses on optimizing systems that are already in place, often uncovering years of deferred maintenance, control drift, and equipment degradation.
What to Look for in a Building Commissioning Firm
Not all commissioning firms are the same. When selecting a commissioning partner for a commercial project, look for:
- Certification from recognized bodies like ACG (Associated Commissioning Group) or AABC
- Independence — a firm with no financial interest in the systems being tested
- Experience in your building type and sector (healthcare, education, commercial, government)
- A track record of completed projects and strong references from general contractors and building owners
- Local knowledge of Florida energy codes, humidity conditions, and compliance requirements
SITA has been delivering independent building commissioning services in Florida for over 40 years. Our team holds certifications from ACG, AABC, NEBB, and ITC, and we’ve completed over 15,000 projects across healthcare, education, entertainment, commercial, and government sectors throughout Central and West Florida.
We have no systems to sell and no contractors to protect. Our only job is to verify that your building performs exactly as designed.
Ready to Commission Your Next Project?
Whether you’re in the early design phase or approaching substantial completion, SITA can help. Our commissioning team works with general contractors, mechanical engineers, and building owners across Florida to deliver documented, defensible verification that buildings work. Contact SITA at brian@sita-tab.com or call 813.949.1999 to get started.
Frequently Asked Questions About Building Commissioning
How long does the building commissioning process take?
The timeline depends on the size and complexity of the project. For most commercial buildings, the commissioning process runs concurrently with construction, meaning it doesn’t add time to the schedule when started early. Functional performance testing typically takes one to three weeks, with the commissioning report following shortly after. Projects that skip early-phase commissioning and try to compress everything into the final weeks before occupancy often take longer and encounter more deficiencies.
Is building commissioning required by code in Florida?
Yes, for many project types. Florida’s energy code, which aligns with ASHRAE 90.1, includes commissioning requirements for new commercial buildings above certain thresholds. Healthcare facilities, government buildings, and projects pursuing LEED or FGBC certification have additional commissioning requirements. It’s always worth confirming specific requirements with your project’s mechanical engineer or code consultant early in the design phase.
What’s the difference between building commissioning and a final inspection?
A final inspection verifies that systems are installed per the permitted drawings and meet minimum code requirements. Building commissioning goes much further; it verifies that systems actually perform as the engineer designed them to, tests sequences of operation under real-world conditions, and documents the results. Inspections are pass/fail for compliance. Commissioning is a performance verification process that catches problems that inspections aren’t designed to find.
Can we commission an existing building, or is it only for new construction?
Both are possible. New building commissioning is integrated into the construction process from design through occupancy. Retro-commissioning (RCx) applies the same verification process to existing buildings, particularly those with rising energy costs, comfort complaints, or aging controls. Retro-commissioning often uncovers years of deferred maintenance, sensor drift, and control issues that have quietly been costing building owners money. SITA provides commissioning services for both new construction and existing facilities across Florida.
