How to improve the Energy Performance Certificate (EPC) rating from the real F141

The Ashchurch Business Centre Tewkesbury

The Ashchurch Business Centre, Tewkesbury is predominantly a warehouse unit with two storey offices to the front. The unit had been empty for over a year and the landlord was negotiating a long lease, which was about to be signed. The prospective incoming tenant’s M&E consultant had identified a roof mounted R22 system and had also cast some doubt on the validity of the existing C rated Energy Performance Certificate (EPC).

Challenges and Actions

The potential incoming tenant would not take up the lease unless the EPC rating was a B or above and would not consider the property with any systems using R22. We had just a week to determine a solution.

An assessor attended site and a new Energy Performance Certificate was produced. This assessment identified that the full height warehouse was conditioned for heating and cooling via an all air system comprising an air handling unit, gas fired boiler and external chiller. The boiler also served a separate air system to the offices.

The accurate EPC produced was an F141. Therefore, we needed to explore options to improve the EPC rating to an E or better.

The original EPC model was uploaded to arbn consult which allowed us to immediately see all the original EPC assessor’s inputs from the file as the system unlocks the EPC model file.

The arbn consult software allowed us to assess each of the inputs entered by the original EPC assessor, comparing these against site data from the landlord’s agent. This audit identified that the original system type entered was incorrect and that the assessor had used a system with a much lower expected energy consumption than that which was installed.

Using the accurate EPC produced, the F141 was uploaded into arbn consult and simulations run which identified options to achieve an EPC rating of D91.

Without arbn consult, the assessor would have had to run a number of EPC improvement simulation packages manually and record results at each stage. They would then have had to research costings and the output report would have taken at least a day to complete.

But using arbn consult, we were able to select from a range of costed retrofit solutions manually before running multiple simulations in minutes. The user can also request that the software automatically produces optimal simulations in a report called an Asset Energy Report (AER).

Lessons & Results

arbn consult’s functionality meant that the report, costings and all options available to the client were quickly and efficiently delivered in one professionally packaged document.

arbn consult ensured that the landlord’s interests were protected, that they were not at future risk under MEES regulations and were able to complete a ten-year lease on a previously empty building.

This project has:

  • Quickly identified accuracy issues with the original Energy Performance Certificate.
  • Simulated fully costed retrofit options to improve the EPC from an F141 to a D91.
  • Provided an intuitive investment report with costs, energy savings and ROI.
  • Provided a fast turnaround allowing lease negotiations to be satisfactorily completed.

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