Although it is not necessary, you may decide to tip your contractor for a job well done. Since you will have already set a price, tip between 15 to 20 percent of the service price.
physiological reward
There are many ways to give acknowledgement of a job well done. Some are by giving a reward, trophy, award, raise, or promotion. It all depends on the type of job that has been done.
the reward of a thing rightly done is to have done it
a reward
An example would be --- you win a reward/prize for doing a good job.
You done the job really well, means you done it well but also better than expected in other words a job well done.
Very probably one of your friends or relatives, it doesn't appear to have been said in anything published.
Good job ...or you can say job well done...
1. As in job well done: Vel gert 2. As a well done steak: Vel steikt
You get payed
Another word for "well done" referring to meat is over cooked. Other words for "well done" referring to a job are super work, nice job, tremendous performance, wonderful work, congratulations
You can say "Hoʻomaikaʻi iā ʻoe no ka hana maikaʻi ʻana" which translates to "Congratulations to you for a job well done" in Hawaiian.