How tall of a garage door do I need for an RV? Follow The door for an RV garage needs to be two feet taller than the RV. So, if you have a 14' tall RV, you need a 16' tall garage. Related articles How much does it cost to build an RV garage? Can I park my other vehicles in the RV garage? What is the height of most RVs? Does an attached garage raise insurance? Is it cheaper to build an attached or detached garage? Comments 0 comments Please sign in to leave a comment.