BEIS issue consultation on next versions of RdSAP and SAP

Updated: 10/11/16

BEIS have today announced via the BRE that they are going to run consultations on the next versions of RdSAP and SAP.*

*please note since writing this news article yesterday, the BRE webpage indicating the BEIS consultation and changes to the methodologies has been removed

Elmhurst have been expecting this consultation from BEIS for some time and clearly the BRE site has beaten the consultation site. However we assume that the rest of the news article is correct, and we await details within the consultation for further guidance as the direction of both RdSAP and SAP methodologies.

We have quickly analysed the high level impact of this, but we will, as per usual, being giving more concise analysis over the next few weeks.


RdSAP 2012 v9.93

BEIS are suggesting that RdSAP has some minor changes, it will also continue to use SAP2012 methodology as its underlying calculator. A summary of the changes is as follows:

  • Default U-values for certain age bands have been adjusted, which is reflective of recent research
  • Addition of a new recommendation for ‘Party Wall Insulation’
  • Small points of clarification at various points, aligning conventions.


BEIS are issuing the next version of SAP which is SAP2016. The changes here are reflective of more research and technological advances since 2012. The main changes are summarised below:

  • fuel prices, CO2 emissions and primary energy factors have been updated
  • the calculation of hot water consumption has been adjusted to take account of shower type
  • the calculation of lighting energy has been updated to deal with new lighting technologies
  • the default distribution loss factors associated with communal heating networks have been revised
  • the air flow rates associated with chimneys and flues have been updated
  • the calculation of losses from thermal bridges has been revised
  • the assessment of summer internal temperatures has been refined
  • the treatment of mechanical ventilation system heat recovery and aerodynamic performance has been revised
  • the treatment of the overshading of PV systems has been amended

Elmhurst have understood that there will be an update to RdSAP next year 2017. But there are currently no plans for new Building Regulations where SAP2016 could be used for compliance purposes.

Elmhurst will go through both documents and will be responding to the consultation. We will keep our members and the wider industry abreast of what these changes mean. We will be very interested to see the consultation questions; at the time of writing, these were not present on the Government Website. The impact these have on the industry whether existing dwellings or new build will be further understood, and we will give our members as much information as possible in a timely manner.

A further clarification to this news article, whilst RdSAP will likely be changed some time next year, in order to add the extra requirements, it is likely to be based on the current SAP2012 methodology.

The changes implied to SAP2016 will be ‘just’ changes to the methodology; as far as we understand there are no planned Building Regulation updates, so the document may exist, but with no TER or DER for Building Regulation compliance, it may be a ‘dry’ document.

We assume the detail will give a clear steer towards the future direction of the SAP methodology; the output of any calculation using it will continue to be carbon and cost, but with no benchmark of Building Regs, it may be hard to decipher the impact it will have on house building – we will wait to see the Consultation and the draft RdSAP & SAP documents, were we will be able to comment and give our expert opinion.

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