The FLSA does not require extra pay for weekend or night work. However, the FLSA does require that covered, nonexempt workers be paid not less than time and one-half the employee's regular rate for time worked over 40 hours in a workweek.
As of 2014, carpet installers are usually tipped $10 to $15 per job when the job includes removing old carpeting, installation and cleanup. For installation only, carpet installers are usually tipped $5 to $10 each. Continue Reading.
You can always tip your plumber or electrician if you think it is the right thing to do. Most of the plumber working for plumbing contractors are commision based. So again it is your own will to tip them.