An EPC is required when a building is let, sold or constructed.
A domestic EPC, which is short for Energy Performance Certificate, is an energy efficiency rating for dwellings. They were first introduced in August 2007 and are mandatory for the sale, let and construction of dwellings. An EPC is valid for 10 years.
The ratings are banded from A to G, with A being the best. The scale also runs from 1 to 100, with 100 being the top A rating. The purpose is to show prospective buyers or tenants how energy efficient the dwelling is. The average rating of dwellings should be improving over time, as upgrades are carried out and more new housing is developed. In 2020, the average energy rating in England and Wales is reported to be a 60 D.
Domestic EPCs are split into two types. Those required for existing dwellings are assessed via a site visit by the assessor, with data collected at the property and desk-based calculations run using software known as rdSAP. For new build dwellings and conversions, the assessment is desk based, using drawings and specifications, and is calculated using software known as SAP.
The key point to understand with domestic EPCs is the rating is based on the cost to run the building. Although the underlying calculations do not rely on regularly updated prices, typical prices are set at certain points, and these generally reflect the relationship between various fuels and energy sources.
As well as the overall rating, property features are given a rating, this time from very poor to very good. Categories are as follows:
Insulated walls, floors and roofs perform better than uninsulated ones. Some traditional methods of construction have slightly improved thermal properties, e.g. cob, whereas solid stone, even if thick, does not retain heat well.
Double (and triple) glazing gives a better result than single glazing.
Heating systems that are cheaper to run give a better rating. Gas boilers perform well. Night storage heaters, especially the high heat retention versions can also be a reasonable choice, given the off-peak cost is lower. Simple electric panels do not help the domestic EPC rating, as the cost to run them is high.
An EPC is required when a building is let, sold or constructed.
There is a central register, publicly accessible, that lists EPCs. Check here to see if you already have one for your property.
The assessor visits the property to take measurements and photographs and collect information about heating, hot water, lighting and the building fabric. The assessor needs access to all rooms including the loft, if there is one.
The site visit typically takes between 30 minutes and 2 hours. The remainder of the work is carried out at a desk, though some assessors work on tablet computers to enter details as they go.
Costs are fairly low but can vary depending on the size and complexity of the property. Please get in touch if you would like a quote.
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