I have looked at some of your replys to the length of time it would take to clean the windows on this job , and i am seriously taken aback at the thought of cleaning all windows in the pictures in half-a-day ??
The only person i could imagine cleaning within that time would be "BENNY HILL".
If i was quoting i would say 2 days to do a proper job , & i would price it at £350 ,may not get the job looking at some of your other replys as to quote , but it doesnt mean to say the cheapest price would get the job.
I would however say if i did get it, they would get a very good window cleaner & get a very good job done if i won the contract.
You price it at what you think you "believe" is the correct price , basically only you know how good you are !
chris.