---
title: What is SAP and EPC?
description: "**SAP (Standard Assessment Procedure)** is the methodology used in the United Kingdom to assess and compare the energy and environmental performance of buildings. It's a way to calculate the energy efficiency of residential dwellings based on various factors such as…"
url: "https://energyadvicehelpline.org/support-centre/what-is-sap-and-epc/"
updated: "2024-07-04"
category: ECO4 Eligibility Routes
---

# What is SAP and EPC?

**SAP (Standard Assessment Procedure)** is the methodology used in the United Kingdom to assess and compare the energy and environmental performance of buildings. It's a way to calculate the energy efficiency of residential dwellings based on various factors such as insulation, heating systems, and renewable energy technologies.

**EPC (Energy Performance Certificate)** is a document that provides a rating of the energy efficiency of a building, ranging from A (most efficient) to G (least efficient). The EPC includes information about the property’s energy use, typical energy costs, and recommendations on how to reduce energy use and save money.

### How is it calculated?

The SAP calculation takes into account a variety of factors:

1. **Thermal characteristics** of the building (walls, floors, roof, windows, etc.).
2. **Heating and hot water systems**: Efficiency and control.
3. **Internal lighting**: Types of light fittings and their efficiency.
4. **Renewable energy technologies** such as solar panels.
5. **Geographical location** of the property which affects climate-related factors.
6. **Ventilation** and air quality considerations.

The result of the SAP calculation is expressed as a score from 1 to 100+; the higher the score, the lower the running costs. This score is then used to generate the EPC.

### Why is it important?

The importance of the SAP and EPC can be summarised as follows:

1. **Energy Efficiency**: They help homeowners and potential buyers understand how energy-efficient a building is, which directly correlates to energy costs.
2. **Environmental Impact**: Buildings with better ratings (higher SAP scores) have a lower carbon footprint.
3. **Regulatory Compliance**: In many regions, achieving a certain SAP rating is mandatory for new buildings.
4. **Property Value**: Properties with better EPC ratings can often command higher prices and are more attractive to buyers and renters.

### How can people find out their EPC?

Property owners can obtain an EPC by hiring an accredited assessor who will come and inspect the property. These certificates are also available online in a publicly accessible register which can be searched using the property’s address. In the UK, you can find this information on the government’s EPC register website.

### How to improve your EPC?

Improving an EPC involves increasing the energy efficiency of the building. Some common measures include:

1. **Upgrading insulation**: Improving loft, wall, and floor insulation.
2. **Installing more efficient heating systems**: Such as modern boilers, heat pumps, or biomass heaters.
3. **Using renewable energy sources**: Such as solar panels or wind turbines.
4. **Replacing windows**: Installing double or triple-glazed windows.
5. **Improving lighting efficiency**: Using LED lighting and better controls.
6. **Enhancing ventilation systems** to improve air flow and heat recovery.

Improving the energy efficiency of a building not only raises its EPC rating but also reduces energy costs, increases comfort, and supports environmental sustainability.