i only do work for myself on weekends and i still class weekend work as overtime so i try to charge a decent amount , if i was solely working for myself i dont know to be honest because if youre booking work in it would be tricky to know which job will land on the weekend ..............i suppose it all depends on how much you want the job witch would probably relate to all youre work you price, do you want to take the kids out or do a job for an extra 100 quid??.........or do you need the money and dont have a choice?...............but then being self employed you can take the kids out mid week and work a saturday to make up for it ............if you had lads working for you however they wont get out of bed for the same money so you would need to charge for it as you dont want to lose out