The main reason for draughty noisy windows is faulty hinges. This is where the window opening won’t come in tight to meet the rubber seal as a result of stiff or strained hinges. The net result is that there is a gap usually on the bottom left or right corner of the window thus allowing draughts and noise (you hear talking, dogs barking or louder than usual traffic noise). Apart from noise and draughts you are loosing heat and you heating system will have to work harder and longer to maintain your set temperature which will cost you more to run.
Call our window wizard to get it sorted.