The data put into the software program is based on proof that the Assessor gathers during the visit. Typically the Assessor will get the majority of the information whilst going around the home.

What we should prevent is the Assessor putting into the software program the term “as built” for items that will be required where no proof is obtained. When the term “as built” has to be used then the software will default to the worst case scenario based upon what would have been there when the property was constructed. This could have a negative effect on the {rating of the EPC}

If you can supply documentary evidence of these kinds of improvements then this can be shown on the Certificate and is likely to increase the rating of your EPC Certificate.

• Loft extensions year it was constructed – building control sign off, dated architectural drawings.

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

• Any wall insulation External/Cavity/Internal– Any guarantees, or invoice from the installer

• Solar Thermal, or Solar PV – An MCS certificate from installer.

• Floor insulation/ sloping ceiling insulation – receipt from installer showing thickness installed.

The three items that have the main 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 homes are generally 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 property heated by gas would cost around 4.64 pence per kwh and the very same property heated by bottled LPG 23p per kwh. {*source 2019 Nottingham Energy Partnership.} So with a typically semi which uses around 12,000 kwh to heat the home, it would cost £696 to heat with gas in comparison to £2,760 for bottled LPG.. Therefore running costs impacts the EPC score. Higher expenses equals lower ratings.

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 one may come as a surprise, but double glazing does not have as big an impact 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. However, where it can have a more substantial impact, is when the property is up-graded from single glazing to double glazing. When you are changing from pre 2002 double glazing, to current double glazing, it will only show as a small increase 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 measured.

 

Low Energy Lights
Again low energy lights does indeed help the Energy Performance Certificate because they are an inexpensive improvement that leads to reduced energy costs but nowhere near the same contribution as insulation, heating and heating controls.