Dwelling emission rate DER
The Building Regulations set out requirements for specific aspects of building design and construction. Regulation 26 of the building regulations states that “Where a building is erected, it shall not exceed the target CO2 emission rate for the building…”,
The target CO2 emission rate (TER) sets a minimum allowable standard for the energy performance of a building and is defined by the annual CO2 emissions of a notional building of the same size and shape to the proposed building. TER is expressed in annual kg of CO2 per m2.
The DER for the proposed building must not exceed the TER.
Before construction begins, a design stage calculation must be issued to the Building Control Body (BCB), setting out the TER, and DER for the proposed building, along with details of its proposed specification.
Within 5 days of the completion of the construction, a report must be issued to the Building Control Body (BCB), setting out the TER, and DER of the completed building, along with any changes that have been made to the specification, and an energy performance certificate (EPC). These ‘as-built’ calculations require that an air-permeability test is carried out to ensure that the building envelope has been constructed to a suitably high level of workmanship so that air (and with it, heat) will not ‘leak’ through the building fabric. In addition, the BCB is likely to require a commissioning notice.
The TER and DER can be calculated by following the Standard Assessment Procedure (SAP). This can be done by using a computer program approved for SAP calculations by BRE on behalf of the government.
NB 2013 changes to part L of the building regulations which came into force on 6 April 2014 introduced a Target Fabric Energy Efficiency (TFEE) rate for dwellings to sit alongside the Target Emission Rate. The TFEE is the minimum energy performance requirement for a new dwelling. The Dwelling Fabric Energy Efficiency (DFEE) rate is the actual energy performance of the new dwelling. The DFEE must not exceed the TFEE. See Target fabric energy efficiency rate for more information.
 Related articles on Designing Buildings Wiki
- Air permeability testing.
- Approved documents.
- Building emission rate.
- Building regulations.
- Dwelling type.
- Improving the energy efficiency of buildings.
- National Calculation Method.
- Simplified Building Energy Model.
- Standard Assessment Procedure.
- Target emission rate.
- Target fabric energy efficiency rate.
 External references
- Planning portal: Approved document L.
Featured articles and news
What is liquidation and how does it apply to contractors in the construction industry?
Scrutiny is placed on Carillion's controversial 2013 decision to extend subcontractor payment terms to 120 days.
RSHP unveil their involvement in a boundary crossing which will provide a new entry point into Hong Kong.
With PFI currently under the spotlight due to Carillion, this introductory article explains what they are.
Estimates suggest that up to 30,000 small firms could be at risk of non-payment as a result of Carillion's collapse.
Sir Oliver Letwin to lead an independent review into the delays in the delivery of housing.
As Carillion collapses, read our article explaining insolvency in the construction industry.
43,000 jobs at risk as Carillion declares insolvency..
1961 saw the publication of three important books about urban design that remain relevant today.
Next week the planning fee increases by 20% and new fees are introduced.
How the transformative power of BIM and other digital technologies can be used to gain a competitive edge.