Residential new builds - design SAP, as built and EPCs

SAP - this stands for “Standard Assessment Procedure” and is the Governments procedure of assessing the energy rating of buildings. SAP 2005/2009 is used to demonstrate compliance with building regulations for dwellings, Part F for Northern Ireland, Part L for England and Wales. This test has to be carried out before a building is started, at the design stage and also at the completed “as-built” stage. This is because sometimes when a building is constructed changes may have been made to the materials used or the layout, so when a SAP is calculated at the design stage, it may differ from the completed stage – therefore it needs to be confirmed at both stages to ensure it falls within the “pass rate” energy rating.

What we need from you to complete a SAP:

For a Design SAP we will require a copy of the plans and elevations of your proposed property. These can be emailed in autocad or pdf format or hard copies posted to us.
For an as-built (on-construction) SAP we will require a completed, signed & dated as-built formwhich provides us with information on the actual materials used on your building.  If we haven’t done the design SAP we will also require copies of the plans of your property.

The SAP calculation is based on the energy balance, taking into account a range of factors that contribute to energy efficiency:

The calculation is independent of factors related to the individual characteristics of the household occupying the dwelling when the rating is calculated, for example:  household size and composition ownership and efficiency of particular domestic electrical appliances, individual heating patterns and temperatures.  Ratings are not affected by the geographical location, so that a given dwelling has the same rating in all parts of the UK.

SUMMARY

The Government’s Standard Assessment Procedure (SAP) for assessing the energy performance of dwellings. The indicators of the energy performance are energy consumption per unit floor area, an energy cost rating (the SAP rating), an Environmental Impact rating (based on CO2 emissions) and a Dwelling CO2 Emission Rate (DER). The SAP rating is based on the energy costs associated with space heating, water heating, ventilation and lighting, less cost savings from energy generation technologies. It is adjusted for floor area so that it is essentially independent of dwelling size for a given built form. The SAP rating is expressed on a scale of 1 to 100, the higher the number the lower the running costs. The Environmental Impact rating is based on the annual CO2 emissions associated with space heating, water heating, ventilation and lighting, less the emissions saved by energy generation technologies.  It is adjusted for floor area so that it is essentially independent of dwelling size for a given built form. The Environmental Impact rating is expressed on a scale of 1 to 100, the higher the number the better the standard. The Dwelling CO2 Emission Rate is a similar indicator to the Environmental Impact rating, which is used for the purposes of compliance with building regulations. It is equal to the annual CO2 emissions per unit floor area for space heating, water heating, ventilation and lighting, less the emissions saved by energy generation technologies, expressed in kg/m2/year.

 

 

 

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