Measure the backroom the distance from the garage door opening to the back wall of the garage.
How tall is the average garage door.
The standard garage door height is 7 feet 2 1 meters but an 8 foot 2 4 meter height is also available.
On average it should be aroudn 12 14 feet in width and 14 feet in height.
A garage will need backroom that equals the door height plus 18 inches and possibly more based on the installation of an automatic garage door opener.
If you are replacing a garage door the easiest way to determine the size you need is to simply measure the existing door.
Doors made for two cars can be as little as 14 feet wide 4 3 meters but are more commonly 15 or 16 feet wide 4 6 or 4 9 meters.
Buildng own garage for rv saves on storage costs.
Use a step ladder to more easily measure the ceiling height.
Recreational vehicles loom taller than the average suv and as such need extra height built into the garage and the garage door.
In the event you are adding a door to a garage without one you will need to carefully measure the width and height of the opening.
For an approximately 12 x 22 detached garage or one attached to your house the most common width is 8 or 9 feet as for the height it is 7 or 8 feet however in terms of height it can go up to 12 feet to accommodate an rv.