Why is a commercial EPC more expensive than a domestic one?

Unlike the EPC software used for residential property, the Commercial EPC software makes
many fewer assumptions on the property and is correctly based on that specific building and
not a notional one as is the case of a domestic EPC, so the Commercial Energy Assessor has to
collect much more accurate data and comment on the construction and fabric of the building
and the services in much more detail;
For example, calculating resulting U values, light output ratios to specific fan power.
The Commercial Energy Assessor has to be more qualified and skilled and the whole energy
assessment process takes significantly longer, including the building of a 3D CAD model of the
property to run through dozens of simulations. The result being that the Commercial EPC is
significantly more expensive than its residential counterpart. Fees will vary depending on the
size, complexity and heating and cooling facilities of the building. The other major factor for the
price increase is that just to place the commercial EPC on the government database costs
more than the entire cost of an average domestic EPC.


For more information: 

http://www.bestcompliance.co.uk/services/building-compliance/epc-energy-performance-certificates/