When to submit TFEE/DFEE calculations.
DFEE = Design Fabric Energy Efficiency
TFEE = Target Fabric Energy Efficiency
DER = Design emission Rate
TER = Target Emission Rate
As if the design and building of new dwellings wasn’t complex and expensive enough, the introduction of DFEE/TFEE calculations as part of the new dwelling SAP/DER-TER calculation process has created some confusion for Architects, builders and clients alike.
In short, since the introduction of the 6th April 2014 changes, it is essential to have your DER and DFEE calculations carried out by your SAP Assessor and submitted to Building Control along with full working drawings and specification in conjunction with the SAP calculations prior to work commencing on site.
For a full overview of DFEE/TFEE calculations click here.