The data entered into the software is based on proof that the Assessor gathers during the visit. In most cases the Assessor can get almost all the information whilst going around the home.

What we should avoid is the Assessor putting into the software program the phrase “as built” for items which are needed where no information is obtained. If the term “as built” has to be used then the software program will default to the worst case scenario based on what would have been there when the property was built. EPC score.

If you can provide documentary proof of any of these types of improvements then these can be shown on the Certificate and will probably help the rating of your EPC.

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

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

• Sloping ceiling insulation/ floor insulation – receipt from installers showing thickness fitted.

• Roof extensions year it was built – completion certificate, dated architectural drawings.

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

The 3 mains items that have the most significant impact 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 generally heated by either of these fuel sources: gas, peak rate electric, off peak electric, oil, bulk or bottled LPG. So for instance a property or home heated by gas would cost somewhere in the region of 4.64 pence per kwh and the similar property or home which is heated by bottled LPG 23p per kwh. {*source 2019 Nottingham Energy Partnership.} So using a typically semi using around 12,000 kwh to heat the property, it would cost £696 to heat with gas in comparison to £2,760 for bottled LPG.. Therefore running costs influences the EPC score. Higher costs equates to 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
Although upgrades to the double glazing does make a difference, the most significant difference is actually really achieved if you are improving from single glazing to doubled glazing. If you are modernising from pre 2002 double glazing, this will only show as a small increase in the energy rating of the property. With double glazing the perception is normally felt by the customer in terms of comfort from a decrease in draughts. As the EPC doesn’t take into account the condition of any specific item, this comfort gain is not measured.

 

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