I just wanted some advice on when it is ok to charge more when windows are particularly bad. I had to do some windows recently which were caked in cement due to work that had been done in the garden. I wasn't able to agree a price before I started as the customer was not in, so I went and did the windows and explained when collecting that the windows had taken a lot longer than normal and I would have to charge double.
Anyway, the next month I got a phone call and was told not to bother doing their windows again. They made some excuse about their dog going barmy after I'd been, but I think it was because I charged them more the previous time.
Was I right to charge more? I've recently done a house which had lots of glue on the window and I haven't seen them yet to see how much to charge but I'm worried about losing a customer over it again. It took an extra 20 minutes to do, so again it took almost twice as long. Any help/suggestions