What is a SAP Calculation?
SAP calculations are a Building Regulations requirement for all new houses & conversions and some extensions.
The Standard Assessment Procedure (SAP) is a measure of the energy efficiency and carbon emission of a residential property and must be carried out by an accredited company such ECO Logic Limited.
For more information visit https://www.gov.uk/guidance/standard-assessment-procedure
HOW IS A SAP RATING CALCULATED?
SAP rating is the calculation that is required in order to produce a Predicted Energy Assessment and an On Construction Energy Performance Certificate.
Building Regulations require that a SAP calculation and a Predicted EPC is submitted for new dwellings prior to the commencement of work.
A SAP calculation indicates a score from 1 to 100+ for the annual energy cost based on:
- The elements of structure
- The heating and hot water system
- The internal lighting
- The renewable technologies used in the home.
The higher the score the lower the running costs, with 100 representing zero energy cost. Dwellings with a rating in excess of 100 are net exporters of energy.
The data is collected from drawings, building notes and spec sheets are inputted into accredited software and a draft report is created. If the project fails, recommendations will be made on how to improve your rating- e.g. lowing u values, increasing the amount of energy saving lights in the house, more insulation.
Since SAP calculations are based upon a desktop exercise, and not a site survey, it is critical, that the correct information is submitted, the following is a suggested list of the information sources and data items required.
1. Site address and postcode.
2. Site plan to include orientation of the dwelling(s).
3. Plans of each storey, normally at 1:100 scale.
4. Elevations drawings for each elevation.
5. Sectional drawings of the dwelling.
6. A written specification which must include:
- Details of the principal heating and hot water system to include make and model of boiler, details of heating emitters, hot water cylinder size (if applicable) and the system controls.
- Details of any secondary heating system present.
- Details of ventilation systems.
- Details of the internal and external lighting.
- Details of the construction of all different floors to the property to include type and thicknesses of insulation and any other building products used.
- Details of the construction of all different external walls to the property to include type and thicknesses of insulation and other building products used.
- Details of the construction of all different roofs to the property to include type and thicknesses of insulation and other building products used.
- Details of the doors and windows to include sizes, type of frame, type of glazing, thickness of glazing, any low emissivity applications.
- Details of any renewable technologies utilised such as ground source heat pumps, solar water heating or photovoltaics