Options appraisal identifies cost-effective compliance solution


The lease for an office building was due for renewal and the EPC rating was F144. Under the Minimum Energy Efficiency Standard regulations (MEES) the property owner was unable to grant a new lease or agree a renewal without an EPC rating of E or above.

The priority for the property owner was to avoid the risk of being unable to lease the property.


The property owner required to make an urgent investment decision in order to arrange works in time for lease renewal negotiations.

Numerous retro-fit energy efficiency improvement options had been considered but without clear information to compare costs and outcomes.


arbnco was asked to provide an Options Appraisal.

The consultant from arbnco uploaded the building model (xml data file) to the arbn consult platform and an Asset Energy Report was immediately generated for the client’s review.

Options Appraisal

The report presented 3 compliance routes for the property owner’s consideration :-

Comparison of Energy
Improvement Strategies
Strategy 1 Strategy 2 Strategy 3
Description Boiler, Lighting Multiple Areas Multiple Areas
Investment Cost £24,651 £84,993 £110,142
New EPC Rating E124 E114 E110
Expected Energy Savings (£/yr) £9,481 £13,076 £15,192
Discounted Payback (years) 2.6 6.5 7.3
CO2 Reduction (kg/m²/yr) 14 20.7 23.7


The decision was to implement Strategy 1 with a total supply and installation cost of circa £22,000 – £27,000.

The expected reduction in the energy running cost was around £9,481 per annum with an expected payback of less than 3 years.

Summary of Benefits

The benefits of using arbn consult for the property owner included :-

  • Obtaining a detailed options appraisal quickly and at a cost of a few hundred pounds.
  • Making an informed investment decision on the most appropriate compliance route, using clear data to compare investment costs and outcomes.