Low carpark height

Today I drove my brother's van out to town. I suppose to park at Shaw Tower. But this weekend got PC show and Shaw Tower is full. So I detour to park at some nearby housing estate. There is a basement carpark but initately I dun want to get in cos I feel my van is too tall. But I saw a similar van came out so I thought it is safe. Who knows it is not! The top of the van is dented and looks pretty bad. Tough luck! Have to be more careful next time.