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SAP stands for Standard Assessment Procedure, which is the UK Government’s approved method for assessing the energy performance of residential buildings. It provides a calculation of how energy efficient a home is and how much it will cost to run.
A SAP calculation looks at a range of factors that affect a building’s energy efficiency, including:
These details are entered into specialist software, which then calculates the dwelling’s predicted energy consumption and carbon emissions.
SAP forms the basis of compliance with Part L of the Building Regulations in England and Wales. It ensures that new homes are designed and built to meet minimum energy efficiency standards, helping to:
A completed SAP assessment produces a Dwelling Emission Rate (DER), which must be equal to or better than the Target Emission Rate (TER) set by the regulations.
When a home is completed, the final SAP assessment generates an Energy Performance Certificate (EPC). This document provides a rating for the property, showing how energy efficient it is on a scale from A (most efficient) to G (least efficient).
SAP assessments are required for:
Without a valid SAP calculation, Building Control approval cannot be granted.
The process involves two main stages:
By following this process, SAP ensures that homes are energy efficient in both design and reality.
TIP: don’t skip the As Designed SAP stage, it could cost you later!
Discover four real-life UK building projects where skipping the ‘As Designed’ SAP assessment led to costly delays, retrofit work, and compliance failures. Learn from these mistakes, understand how early SAP input saves money, and grab your free planning checklist.
Learn the difference between SAP and RdSAP EPCs, when each applies, and how Harpr Surveyors can help – locally in Cornwall and nationally across the UK.
We’ve developed an average ceiling height calculator for EPC assessors, Retrofit professionals and anyone else that would require the calculation. You can also download a calculation overview in PDF format for audit evidence.
Developed for estate agents, landlords and property professionals where an EPC graph is required. Create a clean graphic that can be displayed on sales particulars, online portals or simply email. No sign up or email required, just the Current and Potential score needed!