Commissioning Test
Written by Justin Goodman, CIC, CRIS, CCIP, CEO and Co-Founder, Total CSR
Published: August 27, 2026 · Last reviewed: August 27, 2026
In plain language: A commissioning test is the process of turning on new equipment or a new building system for the first time to confirm it works correctly before the owner starts using it for real. Boilers, chillers, generators, and production lines all go through this step.
Technical definition: A commissioning test is the formal startup, calibration, and performance verification of newly installed equipment or systems, conducted before beneficial occupancy or operational use begins. It appears in builders risk policies as a coverage trigger, often narrowing or excluding testing-related loss, and in equipment breakdown and inland marine forms governing installation risk.
Commissioning Test at a Glance
| Attribute | Detail |
|---|---|
| Also known as | Startup testing, performance testing, test and balance, functional testing |
| Category | Property and liability coverage trigger event |
| Lines of business | Builders risk, commercial property, CGL, inland marine, equipment breakdown |
| Industries most affected | Construction, manufacturing, power generation, water treatment, HVAC contracting, renewable energy |
| Related forms or endorsements | CP 10 30 (Causes of Loss – Special Form), builders risk testing exclusion endorsements, installation floaters |
| Who bears the risk | General contractor, equipment manufacturer, commissioning agent, and property owner, depending on contract terms |
| Common solution | Testing exclusion buyback endorsement or a dedicated hot testing/commissioning endorsement on the builders risk policy |
| Also interacts with | Occupancy clauses, completed operations coverage, warranty and performance bonds |
Key Takeaways
- A commissioning test is the startup and verification process that confirms new equipment or building systems perform as designed before an owner takes over normal use.
- Commissioning testing matters in agency work because many builders risk policies automatically exclude or restrict coverage once testing begins, creating a gap right when equipment failure risk peaks.
- The most common pitfall is assuming builders risk coverage runs continuously through startup, when many policies actually terminate or reduce coverage at the moment "testing" begins rather than at substantial completion.
- Agencies get the best result by confirming, in writing, exactly when the carrier considers testing to start and by securing a hot testing or commissioning endorsement before equipment is energized.
What Is a Commissioning Test in Insurance?
A commissioning test is the checkpoint where a construction project or capital equipment installation shifts from being built to being operated. Boilers get fired up, generators get loaded, chillers get run at capacity, and control systems get validated against design specifications. Carriers treat this moment as a distinct risk category because equipment is most likely to fail, overheat, over-pressurize, or malfunction the first time it operates under real conditions rather than during static installation.
The insurance concern exists because builders risk policies are written to cover a structure or system during the course of construction, not during operational use. Testing sits in a gray zone between the two. A carrier that priced the risk as "under construction" did not price it as "operating equipment," so many builders risk forms carve out testing entirely or require a separate endorsement, commonly called a hot testing endorsement or commissioning endorsement, to extend coverage through startup.
Consider a hospital installing a new backup generator system. The electrical contractor completes installation, and the commissioning agent schedules a load bank test to confirm the generator can carry the full emergency electrical load. During the test, a fuel injection component fails, causing an engine fire that damages the generator and surrounding electrical room. If the builders risk policy excludes loss during testing and no commissioning endorsement was purchased, the owner and contractor may have no first-party property coverage for that fire, even though the building itself was still under construction.
How Does a Commissioning Test Work?
- The installation. A contractor or manufacturer completes physical installation of equipment or a building system, such as an HVAC unit, generator, or production line, but the item has not yet been operated under real load.
- The scheduling. A commissioning agent, engineer, or manufacturer's technician schedules startup testing to verify the equipment performs to design specifications before the owner accepts it.
- The coverage check. The agent or risk manager reviews the builders risk, installation floater, or property policy to confirm whether coverage continues through testing or terminates when testing begins.
- The test. The equipment is energized, loaded, and run through its operational range, often including load banks, pressure tests, or full-capacity runs that stress the system beyond normal startup conditions.
- The outcome. The equipment either passes and moves to substantial completion and owner acceptance, or it fails and generates a loss, at which point the applicable testing exclusion, endorsement, or occupancy clause determines whether the loss is covered.
Real Claim Examples Involving Commissioning Test
Boiler rupture during a manufacturing plant startup
A manufacturing company installed a new industrial boiler as part of a plant expansion. During commissioning, the boiler was pressure-tested beyond its rated capacity due to a calibration error by the testing technician, causing a rupture that damaged adjacent piping and a control panel. The builders risk policy contained a standard testing exclusion, and because no hot testing endorsement had been purchased, the insured's property claim was denied, shifting the loss to the contractor's professional liability coverage instead.
Elevator fire during high-rise commissioning
A general contractor on a mixed-use high-rise project scheduled elevator commissioning before the certificate of occupancy was issued. A motor overheated during a full-load test, sparking a small fire in the machine room that triggered smoke damage on three floors. Because the builders risk policy on this project had been endorsed to extend coverage through commissioning testing, the claim was accepted, and the loss was paid under the property form rather than becoming a dispute over who was liable for the fire.
Water damage from a chiller test at a hospital renovation
A hospital renovation project involved replacing a rooftop chiller unit. During the commissioning test, a refrigerant line fitting failed under test pressure, releasing water and refrigerant into a mechanical room and damaging newly installed drywall and electrical conduit below. The owner's property policy had already assumed partial occupancy of the building, so the loss fell into a dispute between the builders risk carrier and the owner's permanent property carrier over which policy was in effect at the moment of the failure.
Commissioning Test vs. Occupancy Clause: What Is the Difference?
A commissioning test is an event, the startup and verification of equipment, while an occupancy clause is a policy provision that defines when a builders risk policy terminates because the owner has begun using the building or a portion of it. The two concepts frequently collide because commissioning often happens right before or during partial occupancy, and a carrier may point to either provision to deny a claim.
| Comparison area | Commissioning Test | Occupancy Clause |
|---|---|---|
| Primary use case | Verifying equipment or system performance before operational use | Defining when builders risk coverage ends due to owner use |
| Coverage / concept type | Trigger event often excluded or requiring a buyback endorsement | Policy condition terminating or limiting coverage |
| Typical exclusions | Loss from testing itself, unless a hot testing endorsement applies | Loss occurring after the insured takes occupancy or beneficial use |
| Who is most affected by errors | Contractors and equipment installers who test before confirming coverage | Owners who move in or start using space before construction is fully complete |
| Common mistakes | Assuming builders risk covers all startup activity by default | Assuming partial occupancy of one area does not affect the whole policy |
What Are the Most Common Mistakes With Commissioning Test?
- Agencies assume builders risk coverage automatically extends through commissioning, when many standard forms exclude testing losses unless a specific endorsement is added, leaving a costly first-party gap.
- Contractors schedule load bank tests or pressure tests without notifying the agency first, so the carrier never has the opportunity to confirm or add testing coverage before the exposure occurs.
- Certificates of insurance are issued showing builders risk in force without verifying whether the certificate holder's testing activities fall inside or outside the policy's testing language, creating false assurance for owners and lenders.
- Commissioning agents and general contractors disagree on who is responsible for procuring testing coverage, and the ambiguity in the contract surfaces only after a loss, not before.
- Agencies treat "testing" as a single defined term, when carriers vary widely in how they define it, some distinguishing between cold testing, hot testing, and full-load commissioning with different coverage treatment for each.
- Renewable energy and manufacturing risks are underwritten as standard construction projects without recognizing that commissioning of turbines, solar inverters, or production lines carries materially higher equipment breakdown exposure than typical building trades work.
How to Explain Commissioning Test to a Client
Explaining Commissioning Test to a personal lines client
Commissioning testing generally will not come up for a personal lines client, but if they mention a home generator or solar installation being tested for the first time, it is worth flagging. The installer's contractor policy, not the homeowner's policy, should be covering any damage that happens while that equipment is being started up and tested.
Explaining Commissioning Test to a small business owner
Commissioning testing is the moment your new equipment gets switched on and run for the first time to make sure it works right. That moment is actually one of the riskiest points in the whole project, because equipment is most likely to fail under real conditions rather than while it is just sitting there installed. We need to confirm your builders risk policy actually covers that testing period, because a lot of policies do not include it automatically.
Explaining Commissioning Test to a CFO or risk manager
Commissioning testing sits in a coverage gap that standard builders risk forms were never designed to fill, since those forms price construction risk, not operational equipment risk. We recommend confirming whether your policy has a testing exclusion and, if so, securing a hot testing or commissioning endorsement before any load testing begins, particularly on capital equipment like generators, boilers, or production lines where a failure during startup can produce a loss well beyond typical construction damage. We should also map out contractually who is responsible for procuring that coverage, since disputes between owner, GC, and commissioning agent are common when this is left ambiguous.
Frequently Asked Questions About Commissioning Test
Does builders risk insurance cover commissioning testing automatically?
Not automatically. Many standard builders risk forms include a testing exclusion that removes coverage for loss occurring during testing of machinery or equipment, even though the surrounding construction project is still covered. A commissioning or hot testing endorsement is typically required to close that gap.
What is the difference between cold testing and hot testing?
Cold testing generally refers to checking equipment without energizing it under full operational conditions, such as verifying wiring and connections, while hot testing means running the equipment under actual load or pressure. Carriers often treat hot testing as significantly higher risk and may price or exclude it differently than cold testing.
Who is responsible for buying commissioning test coverage?
Responsibility varies by contract and should be spelled out explicitly rather than assumed. On many projects the general contractor procures the builders risk policy and is expected to add a testing endorsement, but on equipment-heavy projects the owner or equipment manufacturer sometimes carries that responsibility instead.
Can a commissioning test loss fall under equipment breakdown coverage instead of builders risk?
It can, depending on when the equipment breakdown policy attaches and whether the equipment is already considered "in service." Some owners layer an equipment breakdown policy to pick up losses that occur once startup begins, but this needs to be coordinated with the builders risk carrier to avoid a gap between the two policies.
Does completed operations coverage apply to damage during commissioning?
Completed operations coverage under a CGL policy typically applies to bodily injury or property damage arising from work after it has been completed and turned over, not to first-party property damage to the project itself during testing. Commissioning test damage to the equipment or structure is usually a property coverage question, not a completed operations liability question.
How can an agency confirm whether a policy excludes commissioning testing?
The clearest way is to request written confirmation from the underwriter identifying the specific exclusion or endorsement language addressing testing, rather than relying on a generic reading of the builders risk form. Total CSR's training work with agency teams consistently shows that CSRs who read only the declarations page miss testing exclusions buried in the causes of loss form, so the underlying form language always needs a direct check.
Related Insurance Terms
- Builders Risk Insurance: A property policy covering a structure during construction, which frequently excludes or restricts coverage for loss occurring during commissioning testing of installed equipment.
- Testing Exclusion: A policy provision that removes coverage for loss arising from the testing of machinery or equipment, commonly found in builders risk forms and addressed through a buyback endorsement.
- Occupancy Clause: A builders risk policy condition that terminates or limits coverage once the insured begins using or occupying the property, which can overlap with or precede commissioning testing.
- Installation Floater: An inland marine form covering materials and equipment being installed at a job site, sometimes extended to include testing exposures that builders risk excludes.
- Equipment Breakdown Coverage: A specialized form covering mechanical or electrical failure of equipment, often used to address losses occurring after commissioning when the equipment is considered operational.
- Completed Operations: Liability coverage under a CGL policy for bodily injury or property damage arising from finished work, distinct from first-party property damage that occurs during commissioning testing itself.
Sources and References
- International Risk Management Institute (IRMI). Builders Risk Coverage Form.
About the Author
Justin Goodman, CIC, CCIP, CISC, CLCS, CRIS, PCIA, QCLS, MFHR CEO and Co-Founder, Total CSR, Inc.
Justin Goodman is a third-generation insurance broker with over two decades in agency operations. He has trained more than 50,000 CSRs, account managers, and producers in commercial and personal lines coverage, from workers' compensation to construction risk. He was named 2024 Insurance Journal Agent of the Year and one of the nation's top five construction insurance experts by Risk & Insurance. He is the author of Retain, which applies cognitive science research on memory and knowledge transfer to insurance training, and speaks nationally on how agencies build durable technical expertise in their teams.