Certainly not thirty!
So if you did 5 houses and they had 5 window`s each would you only charge £25 on the basis that it`s a pound a window,that`s where this pound a window dosen`t work.It only works like that on large jobs when your going to be there for hours on end.
I'd say it's the other way around, if you'd charge a pound a window, then there is a equal amount of time that you work on the window, according to your hourly rate. Usually we're quicker then that. So if you only have 10 windows, your faster then you've quoted for, but not by that much.
But if you have 200 windows, priced a pound, and you don't spend a pounds worth on time on them, multiply that by 200, and your much much quicker done then what you have quoted for, so you've overpriced it. Nice if you get away with it ofcourse, most of my quotes are like that, take me much less time.
But just stating that pricing per window doesn't work the bigger the job gets, would be ideal if you know exactly how long a window takes. Tried that a little while ago with the stopwatch, but there are so many different windows, it's quite difficult.
