I don't know if you're an agile person or not but if you are you can do an awful lot of basic work yourself. Do you know if the walls are insulated, is there a good seal on your front and back doors, how well insulated is your attic, check seals on windows, what sort of heating do you use, etc? These are all DIY jobs that you would be well capable of doing with a little advice and you'll find plenty of help online and also from the hardware stores that stock the products you might need to purchase. It will save you a lot of money as a survey could cost you from €300 to €1000 and might not be as easy to get done as you might think.