Standard Assessment Procedure (SAP)

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Standard Assessment Procedure, is the method for estimating the energy performance of new domestic buildings. The SAP calculation is based on energy performance taking into account a range of factors that contribute to energy efficiency. It is the only official, government approved system for assessing the energy rating for a new home.

Our expert team will consider the following factors for SAP calculations:

Our SAP calculations provide a number of indicators of energy performance these being, an energy cost rating (the SAP rating), an Environmental Impact rating based on CO2 emissions (the Environmental Impact rating) and a Dwelling CO2 Emission Rate (DER).  The ratings are expressed on a scale of 1 to 100, the higher the number the lower the running costs and better the standard.

The SAP and Environmental Impact rating are based on the energy costs and annual CO2 emissions associated with space heating, water heating, ventilation and lighting, less cost savings from energy generation technologies. They are adjusted for floor area therefore independent of dwelling size for a given built form.

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. It is this measurement that compliance for building control is measured against. 

The SAP tool is also used to generate Energy Performance Certificates for on-construction domestic buildings.

When is a SAP assessment required?

If you are planning to construct any new building that will be used as a residence, obtaining a SAP Rating and a Dwelling Emission Rating is generally required prior to starting the construction phase.

Although relatively straightforward to produce, striking the right balance of improvement is not simple. Whilst the SAP should never be used as a design tool, it is highly recommended dealing with an assessor who will be able to spot easy to remedy problems and offer sensible advice to ensure compliance. Coates Design have a huge span of experience in challenging, tricky building developments and always take a client - first perspective when approaching compliance.

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