How Are EPC’s Calculated
Energy Performance Certificates are calculated by a non-invasive inspection of a property to ascertain how energy efficient it is. The assessment looks at insulation levels, what materials walls are made of, the general construction of the property, how it is heated and what sort of lighting is used. It also takes into account any energy that is generated on site which could be from solar pv panels or a wind turbine.
The average property in the UK is a D or E so the chances are, unless you are in a new-build, that your house will be at this level or below.
Newer houses tend to be more energy efficient than older houses, building practices have changed over the years and building regulations have put rules in place to ensure that new properties are built in a way that makes them more efficient, setting out minimum levels of insulation, for example.
The inspection that is carried out is non-intrusive – this means that the inspector will require evidence that a property has been updated if some modernisation has been done. If walls have been internally insulated during a renovation project an inspector may require photos of the work or invoices to show that it has been completed. If this is not available and the refurbishment did not go through building regulations the inspector will assume the construction is standard for the year of the property.
If you are renovating a property, it is important to keep detailed records in order to ensure that an EPC inspector can take all of the improvements into account when carrying out his assessment. It is also a good idea to seek the advice of a home efficiency expert before commencing works as certain works can improve the energy efficiency of a property but be detrimental to the property at the same time.
For advice on how to improve the energy efficiency of your home please contact us.