Government release its response to SAP consultation

In November 2016, the Department for Business, Energy and Industrial Strategy (BEIS) published a consultation to seek views on making changes to the Standard Assessment Procedure (SAP).

After reviewing the industry’s feedback on the proposed amendments, the Government has published its final response to the SAP consultation and concerns from a range of interested groups.

What is the purpose of the SAP consultation?

The Government last made changes to the SAP methodology back in 2012. Since then, several technical improvements have been identified due to improved research, innovation and technology developments.

The BEIS released its consultation in 2016 to gather the industry’s views and opinions on proposed changes to how SAP assesses the energy performance of domestic dwellings.

The purpose of the consultation document is to set out the Government’s response to the industry’s feedback. Responses will then be used to update the next version of the SAP methodology.

After a consultation has been carried out into changes to the Building Regulations, the SAP2016 methodology is expected to be published in 2018. It’s also worth mentioning that Part L of the Building Regulations will not be reviewed until the investigation into the Fire Regulations has been released in spring next year.

Stroma’s response to the SAP consultation

After the SAP consultation was announced, we published our response to the consultation on behalf of our member’s.

Andrew Parkin (Technical Manager), along with the technical team compiled their views and opinions on 20 questions regarding the proposed changes. These were then sent to BEIS to help form their final response.

View Stroma Certifications response to the SAP Consultation.


Andrew Parkin, Technical Manager said: "As one of the largest accreditation bodies of DEA and OCDEA assessors, Stroma Certification has taken the time to respond to the government’s consultation on potential changes to the SAP and RdSAP methodologies.

Stroma is keen for the SAP methodology to become more accurate, and where inaccuracies have been identified or new technologies become common place, then the methodology must change.

Overall, Stroma welcomes the opportunity to provide feedback on this consultation and again suggest that our members do likewise. It is clear to Stroma that where empirical evidence exists to prove that SAP2012 requires improvement (to methodology or default values) then changes should be made. However, increased accuracy should not come at the expense of difficult to follow conventions or time consuming methodology."


What are the proposed changes to the SAP methodology?

The SAP consultation included 17 questions regarding proposed changes to SAP and three questions which requested industry feedback on broader issues.

The proposed changes to the SAP methodology included:

  • Updating Carbon Emission Factors
  • SAP heating regime
  • Distribution loss factors for heat networks
  • SAP’s lighting calculation including RdSAP
  • Treatment of thermal bridges
  • Treatment of areas next to unheated spaces
  • U-Values for walls in existing dwellings – RdSAP
  • Hot Water methodology in SAP
  • Summer temperatures assessment
  • Mechanical Ventilation Systems
  • Chimneys
  • Secondary Fraction from Storage Heating
  • Solid fuel heating efficiencies
  • Solar P systems and overshading
  • Treatment of Solar PV and solar thermal systems – diverters
  • Boilers and seasonal efficiency in the Product Characteristics Database (PCDB) – including RdSAP
  • Heat pump default values
  • Technology costs in RdSAP
  • Heating controls

What was the Government’s final response?

For more detailed information on the questions asked and the Government’s response, download the published SAP consultation.




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