If you agree a price that has been quoted and that work has been done to a satisfactory standard, then you have not been overcharged, if the work takes ten minutes or ten days this is not a factor on the price quoted!
I don't agree. If I'm quoted a price, I assume that this price not only reflects the completed job but also the amount of work that's gone into it. If a job can be easily completed in two hours, then the customer shouldn't be charged as if it was for 5 hours.
I think you may have had a bad experience, which has scarred you and given you a heavily biased opinion against tradesmen in general.
I suggest in future you research your tradesmen well, then make an informed decision based on that research, then agree a price and the quality expected based on that price, then ask for contracts to be exchanged.
Anyone who deals with workmen, will have good and bad experience, and you learn not to be too trusting. This has nothing to do with "scars".
If asked I am always willing to show quality of my work, offer genuine testimonies of my work and if you want to look at the certificates/quals I have attained over the years, I have a folder full, that is available.
I am also a member of trade organisations, where I can be checked up and there are compliant procedures that can be made against me, if they are required.
If all workmen were that consciencious, people wouldn't have any problems with them.
Don't get it into your head that this is all one way traffic, there are many despicable customer out there, that when they require work to be done there objectives are on completion not to pay or not pay in full. Unfortunately BCC, ITV, CH4, CH5 etc.. Don't seem to think this would make good TV viewing.....
If a contract has been signed and the work's been done properly, then I can't see how a customer can renegotiate the price or refuse to pay. The real problem seems to be that contracts are NOT made, which means that the tradesman can cash in the money without declaring it. But on the other hand, he has a problem when the customer doesn't pay up.