The information entered into the software program is based on proof which the Assessor gathers during the visit. Typically the Assessor will get almost all the information whilst going around the home.

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

Whenever you can provide documentary evidence of these kinds of improvements then this can be shown on the Certificate and will likely help the rating of your EPC Certificate.

• Any type of wall insulation Cavity/Internal/External– 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 fitted.

• Roof extensions year it was constructed – completion certificate, dated architects drawings.

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

The three items that have the main impact on the energy rating are:

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

Main Source of Fuel
UK homes are typically heated by either of these fuel sources: gas, peak rate electric, off peak electric, oil, bulk or bottled LPG. So for example a property or home heated by gas would cost somewhere in the region of 4.64 pence per kwh and the exact same property or home which is heated by bottled LPG 23p per kwh. {*source 2019 Nottingham Energy Partnership.} So with a typically semi-detached which uses around 12,000 kwh to heat the property, it would cost £696 to heat with gas compared to £2,760 for bottled LPG.. Therefore running costs impacts the Energy Performance rating 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
Although improvements to the double glazing will make a difference, the most significant difference is actually really achieved if you are upgrading from single glazing to doubled glazing. If you are upgrading from pre 2002 upvc double glazing, this will only show as a small increase in the energy rating of the home. With upvc double glazing the perception is generally experienced by the customer in terms of cosiness from a reduction in draughts. Since the EPC doesn’t take into account the condition of any particular item, this kind of comfort gain is just not measured.

 

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