hi there,
was the price agreed prior to starting the work? was it agreed with your client, ie the main contractor.?
did you get a day work sheet signed off from the developer?
did you have any discussions with site personnel, during the cleaning operation to inform them of the work load and therefore the implications regarding the cost.
we have several different methods of operation, where we are on site full time, IE it is our site and do all the cleans, then we work on tender and day work sheets. if we go back into a property to check the floors then its FOC , bit of give and take.
if we are doing one off work and we do it a lot, we will photograph prior to work start, and in extreme circumstances we will bring site manager into plot and highlight, ie excess paint on window frames, light fittings etc.
these photos are then available for the client to view if thay want to dispute.
my opinion would be to speak to site management firtst, and ask why the invoice for the clean has been rejected. site may not even know its been rejected. if they dont then use them to speak to the surveying department, and explain the extent of the work carried out.
another route, would be to invoice the cleint, so that they can then contra charge the decorators, for making even more mess ie excess paint on floors.
contra charging by the developers back to other trades happens every day of the week. (there is a warning in there for you aswell) if you ever see scratches in bathrooms, kitchens, or on any windows, report it the same day to site management. PROTECT YOURSELF.
i hope that the above provides some form of guidance.
regards
martin