I used to work for a utilities company for electricity and the "average" takes into account the little old lady down the street in a 1 bed bungalow who is frugal with her usage.
Compare that to a house with 2 adults and 2 teens in it, usually games console, mobile phones, laptops, plus kitchens with fridge freezers, washing machines (bigger clothes take up more space in machine means more washing,) dishwashers, kettles, toasters, ovens, hobs, tumble dryers, then moving on to electric showers and toothbrushes etc it is a hell of a difference.
We are in a 4 bed house, the electric doesn't change that much from summer to winter as it is only lights that change usage wise and they are on timers, gas for winter is the killer. We have done meter readings and have a spreadsheet (with graph
) for the last 10 years. Prices rise and fall but you can see the consumption.
This house holds the heat well but we have recently bought a thermometer thing that you point at stuff and it tells you the temperature. It allowed us to see where we have draughts coming in such as where cables come through into the lounge, or around a door to the outside which meant we could seal them better.
I pay more than you but I am home all day and do have 2 boys at secondary so I probably do more laundry than you and I use a tumble dryer every day. Plus the boys shower every day before school using an electric shower.