The Scottish Technical Handbook for Domestic Buildings looks at the entire building’s performance and CO2 emissions, rather than isolating one particular element. All domestic buildings must be designed and built so their individual Dwelling CO2 Emissions Rate (DER) is no worse than the Target CO2 Emissions Rate (TER).
The TER is generated from a package of measures set for each main heating fuel type; if buildings are constructed following the full package, then it is likely that the DER will meet the TER. As a simplified approach, the dwelling can be considered to reduce CO2 emissions to the same level. CO2 Emission Rates are calculated using a calculation methodology called SAP (Standard Assessment Procedure) 2012.