Hi all, thanks for all the replies.
I’ve visited the school now and have counted 320 windows of various sizes, which more or less average out to be ‘regular’ house sizes.
Without breaking my balls I’m thinking 4 days work, external only.
With deductions, and taking into consideration everyone’s comments, I’m thinking £960. Or am I being too generous?
With all my customers being residential, Im thinking, without reason, that over £1000 makes it feel a huge amount of money, especially to a school.
Opinions would be useful. Cheers