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Predicted Energy Assessments

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Predicted Energy Assessments (PEA’s) must be completed for all New Build Dwellings from 6 April 2006. Building Control require the Dwelling Emissions Rating (DER) to be better than or equal to the Target Emissions Rating (TER) of a Notional Dwelling with equal properties.

On Construction Energy Performance Certificates

On Construction Energy performance certificates (EPCs) are required on construction of new domestic properties from 6 April 2008. The EPC being one of a number of documents produced using SAP software for compliance under Part L of the Building Regulations.

L1B Existing Dwellings

From April 6th 2008, as with New Build Dwellings, all buildings that undergo a material change of use (e.g. building converted to apartments) now require a PEA to be handed to Building Control to achieve compliance. An On Construction Energy Performance Certificate will then be required as part of the Home Information Pack (HIP) when the Properties are marketed on the open market.

Many common projects are subject to the guidance of Part L1B of the Building Regulations. These include the extension, alteration, or renovation of existing dwellings, and 'change of use' of other types of buildings into dwellings. Advanced Energy Assessors are well equipped to support such projects, to identify specification options and to demonstrate how they comply with the requirements.

Background Information on Standard Assessment Procedure (SAP)

The SAP calculates a rating for the energy cost due to the built structure of the home and its heating system, internal lighting and any renewable energy technologies used in the home. It does not include energy used for cooking and appliances. Also, the SAP uses a “middle of England” location for calculating the level of heating required throughout the year.

The SAP rating provides the basis for the Energy Performance Certificates (EPC’s) required by the EPBD, which place the SAP rating on an A-G scale (similar to that used for energy labels on white goods).

The Environmental Impact (EI) rating is based on the estimated annual CO2 emissions per square meter due to space heating, water heating, ventilation and internal lighting, minus any CO2 emissions saved by any generation of electricity. It is expressed on a scale 1-100+, rounded to the nearest integer, with the higher the number the better the standard.

The Dwelling CO2 Emissions rating (DER) is the estimated annual CO2 emissions per square meter due to space heating, water heating, ventilation and internal lighting, minus any CO2 emissions saved by any generation of electricity. In other words, it is the rate of CO2 emissions in kg/m2/year.

The DER is calculated from the total energy consumption estimates for the main space heating system, secondary heating system, water heating system and pumps, fans and internal lighting, multiplied by the appropriate CO2 emissions factor (in kgCO2/kWh) according to the fuel(s) used. The DER is measured to 2 decimal places.

An estimate of the DER based on the SAP is now required to demonstrate compliance with Part L1A & Part L1B of the building regulations 2005. To meet the requirements of Part L1A or Part L1B the DER has to be lower than a corresponding Target Emissions Rate (TER) for a notional dwelling of the same size and shape.