The tween years serve as a warm-up of sorts for the challenging teen years to come. Major projects like a room design can lead to battles between kids struggling to assert their independence and parents who are footing the bill. Make your tween room remodel as smooth as possible by sitting down and planning the project with your child in advance. Help him sketch his desired layout and make a list of what features he'd like to have. Use this time to talk about why certain ideas work and others might not. This is also the perfect opportunity to talk about things you're not willing to compromise on, such as sufficient storage space to keep their belongings neat and organized and no lock on the bedroom door.
Even the best-laid plans won't prevent some conflict between what your child wants in his room and what you think he should choose. When you butt heads, remember that the tween bedroom is the only space he can truly call his own. This type of perspective can help you pick and choose your battles and allow your kid to assert himself within reason. So if your daughter has her heart set on bright purple curtains or a sequined lampshade, let her have them. She'll grow out of them sooner or later, and these things are easy and cheap to change once her tastes mature in a few years.