Hi Simon
I have put a spreadsheet on our website that you can download and use for your productivity rates. They are open to some personal interpretation (and you can adjust them) but if you are competing for contracts of this size, these are the rates that you should aim for to be competitive.
On the spreadsheet you should enter info into the columns labeled
Floor size (accurate)
Cleans per day
Days per week
You can also enter a variation to the productivity rate in the column marked (funnily enough)
Variation to productivity rate.
This would be to allow for high or low density useage.
When putting in the floor size you should put the TOTAL floor area for that 'type' .
At the end it will give you the hours per week for the whole building.
It's not what I would use for smaller contracts but for bigger ones it's a must.
I could have just emailed it to you but I've made it 'downloadable' as I KNOW I'm going to get asked for this a million times.
http://www.cmscleaning.com/Productivity.xlsGood luck