A building that looks finished is not a building that works. What commissioning actually proves, and the beliefs that let owners skip it.
Commissioning is the process of proving that installed systems work individually and together, under realistic conditions, and that the people who will operate them know how. It is the last activity in a programme and the first to be compressed when the project is late. An owner who accepts a building on the strength of its appearance inherits every system problem as an operating cost.
How to test a claim like this
Test any commissioning claim with two questions. Is there a document recording measured results against the design requirement, rather than a statement that the system was started and ran? And was the test carried out under conditions resembling use, with the building in the state it will be occupied in? A system that ran for an hour in an empty building has demonstrated that it switches on.
Myth 1: If the air conditioning runs, it has been commissioned.
Reality: Running is not performance. Commissioning measures air volumes at each outlet against the design, checks balancing between zones, verifies control sequences and confirms that the system holds conditions under load. Unbalanced systems run continuously while some rooms stay warm, which shows up as an energy bill rather than a defect.
How to check it yourself: Ask for the balancing report with measured flows against design flows for every outlet, not a certificate that the plant operated.
Myth 2: Commissioning is the contractor internal process.
Reality: Commissioning results are evidence you rely on for the life of the building, and they support warranties and operating decisions. A process witnessed by nobody on your side produces paperwork rather than proof, and the gaps only become apparent during the first summer.
How to check it yourself: Require witnessing by your supervising engineer or an independent commissioning specialist, with attendance recorded on each test sheet.
Myth 3: Systems can be commissioned while finishing work continues.
Reality: Many tests need the building in its final state: ceilings closed, doors hung, dampers accessible, power stable and the space free of dust. Commissioning around ongoing work produces results that have to be repeated, and the repeat rarely happens once the certificate is issued.
How to check it yourself: Sequence commissioning after the areas concerned are complete, and refuse results obtained in areas still being worked on.
Myth 4: Integrated testing is unnecessary if each system passed.
Reality: The interactions are where buildings fail. Fire alarm activation should shut down air handling, release doors, recall lifts and trigger pressurisation, and each of those systems has a different installer. Individual passes prove nothing about the sequence that matters most in an emergency.
How to check it yourself: Require a cause and effect test of the integrated fire and life safety sequence, witnessed and documented, before acceptance.
Myth 5: Training the operator can happen after handover.
Reality: The people who installed the systems leave when the project closes, and the knowledge goes with them. Training delivered later, if at all, is delivered by someone reading the same manual your operator has. An untrained operator defeats correctly commissioned systems within a year.
How to check it yourself: Make recorded training sessions with a named attendee list a condition of practical completion rather than an item for later.
Myth 6: The commissioning certificate is the document I need.
Reality: The certificate is a summary. The value is in the underlying test sheets with measured readings, the balancing report, the control settings as left, and the manuals and as built drawings that let a future engineer understand the installation.
How to check it yourself: Collect the underlying test data and settings, not only the certificates, and check that readings are actually filled in rather than left blank.
What this changes in your decision
- Write the commissioning requirement into the specification, including which tests must be witnessed.
- Programme commissioning as a distinct activity with its own duration, not as a few days before handover.
- Require integrated cause and effect testing of fire and life safety systems before acceptance.
- Make operator training with a recorded attendee list a condition of practical completion.
- Collect the measured test data, balancing report and control settings, not only the certificates.
Domira designs, builds and manages projects across Saudi Arabia for owners who are based abroad: land appraisal, feasibility, design, construction, handover and asset management under one accountable contract. Send us the plot or the brief and Domira will put the numbers in front of you before you commit.
Frequently Asked Questions
What does commissioning involve on a new building?
Pre commissioning checks that equipment is installed correctly, individual system testing against design performance, balancing of air and water systems, verification of control sequences, integrated testing of interactions such as the fire alarm shutting down ventilation, recording of all measured results, delivery of manuals and as built records, and training of the people who will operate the building.
How long should be allowed for testing and commissioning?
It depends on the systems installed, and the answer should come from the commissioning plan rather than from the space left at the end of the programme. What matters for an owner is that the duration is shown as activities on the baseline programme, that it follows completion of the relevant areas, and that it is not the buffer absorbed whenever earlier work runs late.
Can an owner take handover with commissioning incomplete?
You can, and owners under pressure to occupy frequently do, but the incomplete items should be listed, valued and covered by retained money rather than left as a promise. Understand also that occupying a building changes the conditions under which tests are performed, so some measurements become harder to obtain. Before agreeing any partial acceptance, have the wording checked so it does not read as acceptance of the whole.
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