Retro Commissioning

Retro-commissioning (Retro-Cx) applies the commissioning process to a building that is already in use. We investigate how the MEP systems actually run today, compare that to the original design intent, and give you a prioritised plan to restore performance and cut energy waste.

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Buildings Drift. Retro-Commissioning Brings Them Back.

Over the years, setpoints get overridden, dampers get stuck, filters load up and control loops end up running in manual. Nobody decides to waste energy; it just happens one small change at a time. Retro-commissioning finds those changes and reverses them, usually without major capital spend.

Retro-Commissioning Scope

1. Mechanical systems

AHU condition: filters, coils, belts, bearings and drain pans
Airflow re-survey at terminals compared with the original TAB report
Re-balancing of air and chilled water systems
Chiller performance, condenser cleaning and chilled water reset strategy
Pump duty points, VSD settings and strainer condition
Water treatment sampling

2. Electrical systems

Infrared thermographic survey of switchgear, busbars and terminations under load
7 day power quality analysis: harmonics, power factor and voltage unbalance
Protection relay re-testing
Generator, ATS and UPS re-testing, including battery autonomy
Panel schedule and earthing audit

3. Controls and BMS

Control logic review and overridden points
PID loop re-tuning
Setpoint and schedule optimization
Alarm history review and fault detection
Energy baseline from 12 months of consumption data

How We Run Retro-Commissioning

Document review. As-built drawings, maintenance records and previous commissioning reports collected and reviewed.
Site investigation. Inspections and measurements during normal occupancy, coordinated with your facility team to avoid disruption.
Findings report. Every deficiency classified by severity, with recommended action and estimated energy saving.
Implementation support. We verify each corrective action carried out by your maintenance team or contractor.
Completion certificate. Issued once agreed actions are verified and documented.

What You Receive

Retro-Cx findings report with an implementation priority matrix · Energy saving opportunities with estimated kWh per year · Updated TAB report · Thermographic and power quality reports · BMS change log · Updated as-built mark-ups · Retro-Cx completion certificate

Recent Retro-Commissioning Projects

InterContinental Riyadh · Abha Palace Hotel, Abha · Hilton Garden Inn, Al Khobar · Mouwasat Hospital, Madinah · King Saud Library, Buraydah · King Fahad Cultural Center, Buraydah · Asir Regional Museum

Retro- Commissioning FAQ

Do you have any question?

1. What is retro-commissioning?

Retro-commissioning is a systematic investigation of an existing building’s MEP systems to find faults, restore design performance and reduce energy use. It applies to buildings that were never commissioned or have drifted over time.

2. How is retro-commissioning different from re-commissioning?

Retro-commissioning is for a building that was never commissioned. Re-commissioning repeats the process on a building that was commissioned before. TABCOMM delivers both with the same method.

3. Will retro-commissioning disrupt hotel guests or patients?

We plan every site activity with your facility team. Thermal surveys and power quality logging run under normal load with no shutdown, and BMS data is pulled remotely where possible

4. How much energy can retro-commissioning save?

It depends on the building’s condition. Our findings report gives an estimated kWh saving for each recommended action so you can prioritise by return.