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 comes standard on my General Steel building? What size building can I build on my property? Comments 0 comments Please sign in to leave a comment.