For some children it just isn’t possible to get clean and dry before they start school. Information about toileting/changing can be found on our school toilets page.
Like with any big change in routine, there's a lot for your child to adapt to when they first start school and toileting accidents are common. It may be the first time they've used the loo away from home and there are lots of distractions in the class room. Pack them a bag with some spare clothes, pants and wipes so they have these ready.
Accidents usually settle down after a few months, but if you're feeling worried, speak to your child's teacher and look at our resources on bladder and bowel problems if you think something else could be going on.