And some wonder why window cleaners get looked down upon :
Confess to the home owner, apologise and let them decide whether they want to take it further. If they do, you then have to decide whether to fight your corner or foot the bill.
Shocking attitude from some on here! 
totally agree with this post, you guys really need to have a word in your own ear that said it is the home owners fault, you broke it admit it and put it right. so many times do i hear of things like this , it really is a joke, then again I get extra work from this because of the way others are not honest in the way they work.
if your wfp you should not be on the roof simples, if you cant do it from the ground dont do it its not hard to work out, let some other chancer break things, there is plenty of work out there that does not have this problem, but to hide the fact you damaged it and for others to reply saying hide the fact is shocking.