How Does an EPC work? – epc4less

When the Domestic Energy Assessor (DEA) visits your home, they will have to record information in relation to the fabric (structure) and services of the property. This means that they take evidence showing the property type (i.e, if it is a detached, or mid terrace house, or a flat), as well as evidence of the type of wall (i.e, if the house has cavity walls or solid walls or a mix of both).

The home energy surveyor will measure the length of the exposed walls in order to calculate the heat loss perimeter. They will also work out the area in square meters of all floors and extensions. 

Then the assessor will need to take evidence of the property’s heating system (i.e. if it is a gas heating system, or an oil heating system or an electric storage off peak system) and record the make and model of the boiler. The assessor will want to establish if there are any methods to control the heating such as a wall thermostat, a programmer and even thermostatic valves on the radiators.

The assessor will want to record the type of loft insulation in the property. So they will want to access the loft and check if there is any insulation between the joists or rafters and will measure the depth of that insulation.

Then how is the EPC worked out?

The EPC works based on photographic evidence taken on site. However, the actual EPC rating is produced by the software. The assessor will enter all the above information in government-approved software which then works out the EPC rating.

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