You have to look at the building and take into account things like:
Method: WFP - Ladders - Both?
Access - can you get to each and every window.
How many ups/downs (downs are obviously quicker)
What obstacles will be in your way, parked cars etc...
Travelling cost
Setting up/packing away.
Do you need to provide Risk Assessment. Method Statements, Health & Safety Policy
Payment - will you invoice, chase accounts dept (this all costs money)
When you have taken all this into account look at your own daily/hourly average. Decide how long the job will take and price according to your hourly rate, allow a small % increase to the job to cover how much time will be spent on administration.
If this is contact work don't forget you will be able to clean this in asll weathers so its guarenteed work?
Best wishes,
Trev
