Consultants, suppliers & installers of Solar PV

The Energy Performance Certificate

Energy Efficiency and Environmental Impact

Energy Efficiency is self-explanatory, reflecting how effectively energy that is needed around the property is used. A higher rating means a more efficient use of energy. Environmental Impact is essentially a measure of how much carbon dioxide (CO2) is emitted from the property. The higher a rating on the Environmental Impact, the less CO2 is emitted.

EPCs show the current and potential energy usage of a property through the government's approved Standard Assessment Procedure (SAP). The basic underpinning of the SAP rating is a points-based system ranging from 0 to 100. When a property has an EPC assessment it is given a SAP rating with a higher score denoting more efficiency.


EPC Bands

The SAP score has been divided into seven category bands that summarise a property's energy efficiency and environmental impact:

A       92 - 100 SAP points (most efficient)
 B      81 - 91 SAP points
  C     69 - 80 SAP points
   D    55 - 68 SAP points (minimum for Solar Feed-in Tariff)
    E   39 - 54 SAP points
     F  21 - 38 SAP points
      G 0 - 21 SAP points

The Department of Energy and Climate Change (DECC) has established that a property must have a minimum EPC rating of category D in order to receive the full Feed-in Tariff. 


Establishing a D Rating

Properties will need at least 55 SAP points to be eligible to achieve a D rating. DECC have claimed that around 55% of UK domestic properties and approximately 65% of all commercial properties are already at this level.

EPC assessments can be arranged through any registered organisation and vary in cost. They are required before Feed-in Tariff applications can be submitted. 2020SolarPV are able to arrange this for you:

  • An assessment for a home owner should take 2-3 hours.
  • Commercial property owners should be aware that an EPC assessment will involve a more comprehensive and usually more expensive process.

There are quite a few ways you can improve energy efficiency to help achieving a D rating:

 Condensing Boiler47 SAP Points
 Cavity Insulation13 SAP Points
 Roof Insulation10 SAP Points
 Cylinder Stat ad Insulation8 SAP Points
 Double Glazing4 SAP Points
 Low Energy or LED Lighting2 SAP Points
 Solar water heating1 SAP Point


A domestic EPC remains valid for a period of 10 years, or until alterations affect the rating.



There are certain exemptions for the category D requirement for some properties:

  • Places of worship (e.g. churches)
  • Temporary buildings in use for less than 2 years (e.g. portable buildings, site buildings)
  • Low energy demand buildings (e.g. farm outbuildings, barns)
  • Stand-alone buildings less than 50 sq. m (e.g. sheds, summer houses)
  • In general, commercial premises that are less than 50 sq. m Gross Internal Area


We will be able to advise on how these may apply - call on 01386 80 2020 or get in touch!



2020 Heating Limited , trading as 2020 Solar PV.  Registered in England, Incorporated 1 December 2010 

UK Company  # 7456512 ;  VAT  Registration # 106 4420 53

Registered office :  West View House, Neweys Hill, Northwick, Worcester, WR3 7AL

Operational office :  The Old Rectory, Church Road , Strensham, Worcs, WR8 9LW