Man given wrong energy rating after £60k green upgrades on house

All EPCs and the people who carry out the assessments must be accredited.

Elmhurst Energy runs software assessors used to collect information, calculate a rating and produce the certificate.

Its CEO, Stuart Fairlie, said incorrect ratings was a common problem and he has had hundreds of complaints.

“Unfortunately, the methodology by which the energy assessors uses is based on price and electricity is more expensive than gas,” he said.

Mr Fairlie said the process was “out of date” but there was not a lot which could be done unless the government changed the methodology.

He said he hoped it would happen next year.