To obtain an Energy Performance Certificate (EPC) for a property, the assessment process focuses on evaluating two main factors:

1. Energy Usage per Square Meter:

This factor measures how efficiently energy is used within the property. It considers aspects such as insulation levels, heating systems, lighting efficiency, and the presence of energy-efficient appliances.

2. Carbon Dioxide Emissions:

The assessment calculates the estimated annual carbon dioxide emissions from the property, reflecting its environmental impact based on energy consumption.

Key Features of EPC Calculation:

Segmented Assessment: Each component of the property (windows, heating systems, lighting, etc.) receives a score based on its current condition and efficiency level.
Standard Assessment Procedure (SAP): The overall assessment score is categorized into 7 bands (A to G), with corresponding SAP points ranges:
A (92-100 SAP points) - Green
B (81-91 SAP points) - Green
C (69-80 SAP points) - Green
D (55-68 SAP points) - Yellow
E (39-54 SAP points) - Amber
F (21-38 SAP points) - Orange
G (1-20 SAP points) - Red

Ways to Calculate an EPC:

1. Online Energy Calculator Software:

These tools provide a rough guide based on user-entered data. However, accuracy can vary depending on the completeness and correctness of the information inputted, such as wall type (cavity or solid).

2. Certified EPC Assessor:

A trained and certified Domestic Energy Assessor (DEA) conducts a comprehensive assessment tailored to the specific property. This includes detailed inspections and data collection to ensure accuracy and compliance with regulatory standards.

To calculate the EPC of a dwelling, an assessor requires the following information:

1. Dimensions & Orientation: Dimensional plans to determine floor areas, heights, window and door areas, and the building's orientation.
2. U-values & Thermal Bridging: U-values for all heat loss elements and details of works to minimize thermal bridging at junctions.
3. Ventilation: Information on flues, passive vents, draft stripping for external doors, air permeability test results, and the type of ventilation (natural, mechanical, etc.).
4. Windows, External Doors, and Roof Lights: Certified U-values and orientations of all openings, and areas calculated from drawings.
5. Water Heating: Hot water cylinder capacity, insulation details, type of hot water system, control mechanisms, and manufacturer specifications for specific values.

By adhering to these steps and providing accurate information, property owners can obtain a reliable EPC that reflects their property's energy efficiency and environmental impact, crucial for compliance and informed decision-making in the property market.

How Is an EPC Calculated?