Darren Duke
Hi Maryam, It sounds like the windows have not been fitted correctly or have not been sealed correctly when installed. We have fixed many windows and doors with similar problems to what you have described. You have not said what the windows are made of? Wood or UPVC if they are wooden windows are they rotten around the edges? UPVC can you see any gaps around the window where water could get in? I would imagine that its a smaller job than you think but without seeing the problem it's hard to advise or give you a better solution to your problem. If you want to contact me look up Red Security Design with Rated People for more advice on this matter. Regards, Darren. Red Security Design.