Not an easy one, as you might not get a good finish! Whats top of the frames that goes into the building like! If it has not been sealed right, this could be a problem! The frames them self’s are NOT in perfect conditions and I have done frames like this and it could be hard work, so you either tell the customer this (not going to be perfect finish) or your going to have to spend more than normal time to clean
You could be lucky and have no problems! However a pre test is normally the best way to go
PriceTime to get to this job and the next SHOULD be factored in with the price
Ground floor (bay of 3 windows) £1-50
First floor (bay of 3 windows) £2-00
Second floor (bay of 3 windows) £2-50
Third floor (bay of 3 windows) £3-00
If the windows was put to a open tender then I would say you wont get the job on the above prices, however if it’s a local job, that are looking for a good reliable services with just a on going agreement then I would go with the above pricing
Good Luck Andy