We've not moved house for 22 years, ( and even then we did it ourselves, self drive van etc ) so I'm probably out of touch, but I would tip good service.
We recently had some tree work done in the garden ( bigger job than we could tackle ), and the 3 young men were polite, hardworking , and did a good job. It cost an eye watering amount, but I provided hot drinks, and tipped them on completion. They followed my instructions and were careful of my other trees and plants, so they deserved it.
At Christmas I also give boxes of chocolates/biscuits to the vet's surgery ( we see a lot of them with our 2 elderly cats ), our 2 regular postmen, and my hairdressers.
Mr LP takes a box of chocolates at Christmas to the nurses at his blood clinic.
We appreciate good service and good manners.
Take care xxx