top of page
NRG Assessments - Frequently Asked Questions

Frequently Asked Questions

Not sure what an EPC is or why
you need one? Let us answer
your questions...

Please find below some of our most commonly asked questions. If there is a question not covered, please fill in our Contact NRG Form and we'll get back to you as soon as we can.

What is an Energy Performance Certificate (EPC)?

Energy Performance Certificates (EPCs) are a legal document displaying an energy efficiency assessment of a dwelling or commercial unit. The certificate visually displays the rating from A – G also in Green to red, depending on how energy efficient the property is. This is like new electrical appliances, displayed in a similar fashion.

It is assumed the better the rating, the lower the energy usage…. The rating considers the heating, lighting, and hot water -assumed usage.

How long is an EPC valid for?

An EPC is valid for 10 Years

When is an EPC needed?

By law EPC is required when a building is constructed, sold, or rented. EPC are also required for the renewable heat incentive and the feed in tariff.

Is a commercial property exempt from having an EPC?

EPC are not required for.

  • Places of Worship

  • Temporary buildings with less than 2 years in situ

  • Detached (standalone) buildings with a total floor area of 50m2 or less. Commercial only.


Are EPC assessors qualified and how do I check?


  • EPC's can only be completed by a qualified /registered Assessor. The Assessors accreditation details can also be checked on the Landmark official register; Get a New Energy Certificate



How will I receive my EPC?



I have had my report; why does it say, 'Insulation Assumed'?


  • The assessor will gather the required data which will include evidence to support his /her conclusions If the stakeholder has any other supporting evidence, we ask this be made readily available prior to the site visit or while in the property. As this is a nonintrusive survey the assessor is limited to observations.

  • If no evidence is available, the assessor may have to default the insulation based on age of the property and building regulations at the time of construction.


When do I get the report?

The report is emailed within 24 hours after the Survey and when payment is received.

What does the EPC say about the property?

EPC’s gives simulated information about the energy performance of a property; this will include recommendation as to how to improve the energy efficiency of all properties surveyed.

How long does it take to perform an EPC assessment?

Domestic EPC’s take from 30 minutes to one hours depending on size. Commercial EPC’s can take from 1 hour to 2 days depending on the size. The assessor will not cause any inconvenience and the site survey is nonintrusive.

What is an energy assessor looking for?

  • Construction of the building fabric, walls, roof floors and any relevant insulation.

  • Glazing type and percentage.

  • Number of open fireplaces.

  • Checking the make and model of the boiler include the efficiency under EU SEDBUK regulations.

  • Looking for renewable or low carbon technology e.g. solar panels, air source heat pumps.

  • Total amount of low energy light bulbs.

  • Ascertaining the type of heating system in situ Elec, Gas Boiler to radiators, air source heat pump etc.

  • Domestic Hot water type, e.g. from Combination (combi) Boiler, cylinder and insulation measures etc.

  • Calculating the exposed heat loss walls.

  • Checking for excessive window area, larger than typical.

  • Conservatory’s types, if its heated and or separated.

  • Extensions, age and building control sign off.

  • Total amount of habitable rooms.

How long till I receive the report?

Residential Reports are usually emailed within 24 hours after the site survey, but only when payment is received. Larger Commercial buildings will take longer to send.

What is the Minimum energy efficiency standards?

  • Currently properties with a new or lease extension must achieve an EPC rating of E or above to be legally rented.

  • This will change in April 2023 when all leased properties with an existing lease must achieved an E or above.

  • The government is looking at reduce the rating to a C in 2027 and a B in 2030 however this has not been confirmed. They are also suggesting that all private rented properties must have a valid EPC by 2025.

For more information, please click on the links below.

Domestic / Residential

Commercial /Non-Domestic

What do our clients say about us?

See our google reviews Click here to see

bottom of page