Depending on where you are, it's good to start planning a bit of independence when they coming up to year 7, so it's not a big shock when they go to secondary school.
Going to the local shop or out to post a letter if they can get there safely, eg no roads or only quiet roads to cross, or using a pedestrian crossing.
Is there somewhere they can go on a bus on their own? Somewhere they're familiar with, that's not very far away?
Leave them at home alone for an hour, with strict instructions about not opening the door, cooking etc. Playing out with friends without adult supervision, that sort of thing.
Because if they can do all that when they start secondary school, where they'll often need to get there and come home by themselves and stay in, maybe make a snack, until you get home from work, it will make your life a lot easier and mean they're well on the way to gaining more independence.