How to Measure for a New Garage Door

Knowing your garage door opening measurements helps you begin to shop for the perfect new garage door. Learn how to take initial measurements of your garage door opening in order to get a cost estimate from a local garage door installer. 

Measure for a New Garage Door

  1. Measure Width & Height


    The width and height of the garage door opening is the same size as your new garage door.

  2. Measure Sideroom


    This is the width of the areas on the left and right of the garage door opening. Opening must be at least 3-3/4” on each side.

  3. Measure Headroom


    This is the distance between the top of the door and the ceiling (or 1st obstruction). Distance required for most doors with an opener is 15”.

  4. Measure Backroom


    This is the distance from the garage door to the rear of the garage (or 1st obstruction). This must be at least the door height plus 18”; or door height plus 50” if an opener is installed.