Retro-Commissioning
Systematic review and fine‑tuning of existing technical installations to ensure they perform as designed.
Retro-Commissioning (RCx) is a structured method for bringing existing buildings back to their designed performance. Most installations do not operate as drawn — sequences have been changed, sensors drift, and energy is lost where no one notices. RCx finds the deviations and closes them.
We offer three variants depending on the building's complexity, data access and ambition.
Full RCx
Complete system optimisation with maximum long-term savings.
- Mapping of all technical systems against the design intent
- Functional testing of sequences, controls and interactions
- Measurement and verification 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)
Rapid diagnosis and immediate optimisation.
- Walkthrough of central plantrooms and the BMS
- Identification of the largest, quickest-to-implement measures
- Short corrective actions carried out together with operations staff
Suitable for buildings that haven't been reviewed for some time and where a short intervention delivers immediate gains. 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.
- Limited to the systems with the greatest potential
- Combines rapid diagnosis with deeper investigation where it matters
- Adapted to the operations team's capacity and the building's operational phase
After RCx
- Documented performance against the design intent
- Recommendations for energy management and continuous follow-up
- Basis for 3P-garantien if relevant
RCx is not a one-off project. We recommend regular review — typically every three to five years — to prevent deviations from building up again.