The information entered into the software program is based on evidence which the Assessor gathers during the visit. Typically the Assessor will get the majority of the information whilst going around the home.

Your Assessor will take photographic or obtain documentary evidence that is important for audit purposes. If no evidence is obtained then the Assessor has to enter the term “as built” in to the software. In this situation the software program will use what the property would have been built with based upon it’s age.

If you can supply documentary proof of any of these sorts of improvements then this can be shown on the Certificate and is likely to enhance the rating of your EPC Certificate.

• Any type of wall insulation Internal/Cavity/External– Any guarantees, or receipts from the contractor

• Solar PV or Solar Thermal – MCS certificate from contractor.

• Sloping ceiling insulation/ floor insulation – receipt from contractor showing thickness installed.

• Roof extensions year it was constructed – completion certificate, dated architectural plans.

• Double glazing improvements made to the majority of the property – Certificate from Fensa, or dated receipt from the installer.

The 3 mains things that have the biggest effect on the energy rating are:

• The main source of fuel for heating the property
• The levels of insulation in the property.
• The heating system.

Main Source of Fuel
UK properties are typically heated by either of these kinds of fuel sources: gas, peak rate electric, off peak electric, oil, bulk or bottled LPG. So for instance a home heated by gas would cost around 4.64 pence per kwh and the same home which is heated by bottled LPG 23p per kwh. {*source 2019 Nottingham Energy Partnership.} So with a typically semi using around 12,000 kwh to heat the property, it would cost £556 to heat by gas in comparison to £2,760 for bottled LPG.. Therefore running costs influences the Energy Performance rating rating. Higher expenses equates to lower scores.

Levels Of Insulation
Good levels of insulation ensures that the demand on the heating system is kept down, and it also results in a more comfortable home with lower running costs.

The Heating System
An efficient heating system with good controls such as room thermostat, thermostatic valves and programmer helps to keep energy bills down. This all contributes to a better rating on the EPC.

Double glazing
This particular one will come as a surprise, but double glazing does not have as big an effect on the EPC as most people would think. Certainly not nearly as much as the heating, the insulation and the type of fuel used in the property as mentioned above. Where it can have a greater effect, is if the property is up-graded from single glazing to double glazing. When you are changing from pre 2002 double glazing, to current double glazing, this will only show as a small rise in the energy rating of the property.

With double glazing the perception is normally noticed by the customer in terms of comfort from a reduction in draughts. Because the EPC doesn’t take into account the condition of any particular item, this comfort gain is not recorded.

 

Low Energy Lights
Again low energy lighting does help the EPC as they are an inexpensive improvement that contributes to lower energy costs but nowhere near the same contribution as heating controls, heating system, and insulation.