One physical renovation I would make in schools is to replace the woodchips on playgrounds with something much softer or even just leave it as grass. It hurts children's feet when they don't wear the correct footwear and can harm the child if they fall. Another renovation would be to add a fence around the playground to make sure that no kids decide to run off, unnoticed. A third change would be to add a safe room or space to hide in case of a threat. Make sure to add multiple locks, such as a boot or the expensive option, a Haven lock. Haven locks are military-strength locks and are locked and unlocked remotely by mobile. A fourth structural change I would make to schools is to...
I've written three renovation options but I have no idea what your school is like, which also depends on the area you live in. I hope this helped and that you can come up with 2 more changes!! :]