London property would benefit from better environmental construction, according to the UK Green Buildings Council.
Its chief executive Paul King told the Guardian lower energy bills would benefit the taxpayer for several years.
“If we are to cut our carbon, save money and achieve energy security, our buildings have to be on the front line of this battle.”
Currently close to 18,000 buildings are being tested for their energy efficiency and some of the most prominent have returned poor scores.
Parliament and the Bank of England were rated as G, the lowest possible grade, while London City Hall was awarded an E.
Modern commercial properties often incorporate the latest elements of environmental design.
New constructions aim to maximize heat retention and energy efficiency – both help contribute to lower operating costs for firms looking to re-locate to the City.