The paper gives methodology of the Latvian buildings’ energy certification scheme proposed in 2000 for existing and new multi-storey dwelling buildings. It shows the results of the trial implementation of the scheme done with the support of EU LIFE programme in Ogre town in 2002-2004 that had proved it to be an effective mechanism of the reduction of buildings heat consumption. The existing buildings’ energy certification scheme considers only space heating and hot water supply. In order to comply with the requirements of the Directive 2002/91/EC on the certification by total energy consumption the building energy certification scheme has to take into account also gas and electricity consumption. The paper for the first time presents and analyses measured data on total building energy consumption in Latvia. The paper gives theoretical basis and methodology for incorporation of electricity and gas consumption in the standardized annual specific energy consumption used as criterion in the existing building energy certification scheme.