The highest percentage of heat lost from your home is 35% lost through the walls, particularly through stone walls, and through the roof (25%) so concentrate on these areas if you only have a limited budget. You have paid for this heat so why let it escape to the street?
From which parts of your home do you lose the most heat?
Walls – 35%
Roof – 25%
Through gaps e.g. doors – 15%
Through the floor – 15%
Windows – 10%
If you have very little budget but want to make a difference concentrate on draught proofing which you can do yourself.