Retro-commissioning
Systematic review and fine-tuning of existing technical systems to ensure they perform as designed.
Retro-Commissioning (RCx) is a structured method for returning existing buildings to their as-designed performance. Most installations do not operate as drawn — sequences have been changed, sensors drift, and energy leaks where no one sees it. RCx finds the deviations and closes them.
We offer three variants depending on building complexity, data availability and ambition.
Full RCx
Complete system optimisation with maximum long-term savings.
- Mapping of all technical systems against the as-designed functional specification
- Functional testing of sequences, control and interactions
- Measurement and verification (M&V) of performance before and after
- Detailed action plan with documented savings
Suitable for complex buildings, portfolios with reporting requirements, or owners who want to document full performance over time.
Light RCx (LRCx)
Fast diagnosis and immediate optimisation.
- Walkthrough of central systems and BMS/SCADA
- Identification of the largest, quickest-to-implement measures
- Short corrective actions carried out together with operations staff
Suitable for buildings that have not been reviewed for some time and where a short effort yields immediate results. Often the first step before deciding on Full or Tailored.
Tailored RCx (TRCx)
A tailored combination of Full and Light, designed for the individual building or portfolio.
- Scoped to the systems with the greatest potential
- Combines quick diagnosis with deeper investigation where it matters
- Adapted to operational capacity and the building’s operational phase
After RCx
- Documented performance against the as-designed function
- Input to energy management and continuous follow‑up
- Documentation for the 3P-garantien if applicable
RCx is not a one‑off project. We recommend regular reviews — typically every three to five years — to prevent deviations from building up again.