hi there,
this is exactly the reason why we have devloped ConstructionClean Consultancy, its all about management, and communication.
Deliver the service, and get paid for the service, believe me, builders need us a lot,,m especially this time of the year, and you will get issues resolved very quickly, if you ever threatened to walk off site.
we have never done that, and the resaon why? is because al of us know exactly what is required, what is tendered ie contracted works and what is extra.
but in the end its down to each individual , how yourun your business.
regards
martin