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The recent cold snap has cost UK businesses and householders an extra 拢1.2 billion in heating according to estimates by Faithful + Gould.

The cost consultant looked at the amount of extra energy required to maintain a typical home at 20潞C as the outside temperature dropped over the worst two weeks of the winter so far. The team assumed an average outside temperature of -2潞C for the period.

The study showed that the residents of an average poorly-insulated three bed semi-detached house would have spent an extra 拢37 keeping their house warm over the fortnight. If all UK homes used the same amount of additional energy as the average, this would mean a total additional spend of 拢962 million. A heat efficient house would also have seen higher bills but that extra cost would have been reduced to around 拢23.

The calculation for the UK's two million offices assumed a higher outside temperature of 5潞C as most offices are in built up areas and benefit from a 'heat island' effect. A 2潞C drop in temperature would have used an extra 拢284 million of energy to keep inside temperatures at 20潞C over the same two weeks, based on an average 1500m虏 office building. However the team also estimated that a particularly poorly insulated office could have cost an extra 拢149 to heat over that same period.

Ellie Horwitch-Smith, an energy management expert with Faithful + Gould, said: 鈥淎s outside temperatures fall, the cold truth is that already inefficient buildings perform increasingly badly as heating systems struggle to maintain the indoor temperatures demanded of them. Heat is simply lost at a greater rate if the temperature drops鈥�.

Horwitch-Smith added that while the 拢1.2 billion figure was shocking figure it is a very conservative estimate.