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 Can I park my other vehicles in the RV garage? How much does it cost to build an RV garage? What is the height of most RVs? Can my metal garage be attached to an existing structure? Can I customize the size of the garage? Comments 0 comments Please sign in to leave a comment.