
Many homeowners mistakenly assume that the garage door size is the same as the opening size. When considering a garage doors opening measurement, it is key. For garage doors, opening measurement is an essential factor to consider. In fact, accurate garage doors opening measurements are essential—whether you’re installing a roller door, panel lift door, or tilt door. Measuring the opening correctly ensures you choose the right door size, design, and installation method.
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Common Measurement Mistakes
To avoid costly errors, keep these tips in mind when we measure an garage door opening to ensure the correct garage doors opening measurement:
- Always measure from inside the garage looking out. This determines the correct left and right orientation.
- Left vs. Right confusion is common—especially when measuring height differences with garage doors opening measurement.
Tools Required:
- Laser Distance Measurer
- Laser Level
- Tape Measure

Step-by-Step Measurement Instructions
1. Measure Width & Height
Use a tape measure or laser distance measurer to record the door opening width and height (see label 1 in the diagram) to get an accurate garage doors opening measurement.
Important:
- Measure both the left height and right height.
- Use a laser level to check if the ground is level.
- If the left side is higher than the right, this is called a left-hand taper. If the right is higher, it’s a right-hand taper.
âś… You now have:
- Right Height
- Door Width
- Left Height
2.Measure Sideroom
Measure the left and right siderooms (label 2)—the space between the edge of the opening and the nearest wall or obstruction.
Important:
- Sideroom is critical for track installation and motor clearance.
- Measure to the nearest obstruction in the backroom area.
âś… You now have:
- Left Sideroom
- Right Sideroom
3.Measure Headroom
Check the headroom (label 3)—the vertical space between the top of the door opening and the ceiling or first obstruction.
Tip: Use a laser level to identify the first obstruction clearly.
âś… You now have:
- Headroom
4.Measure Backroom
Measure the backroom (label 4)—the distance from the garage door opening to the rear wall or first obstruction.
âś… You now have:
- Backroom
By following these steps, you’ll have precise garage doors opening measurement—giving you the confidence to select the right door style and size, design with accuracy, and ensure a smooth, safe installation tailored to your space.
What’s the Next
Now that you’ve measured your garage door opening, explore the next steps in your garage door journey:
- Garage Door Specifications – Understand sizing, materials, and performance feature
- Garage Door Design Options – Choose styles that match your home’s architecture
- Garage Door Installation Services – Learn about professional installation and setup
- Garage Door Maintenance & Repairs – Keep your door operating safely and smoothly
Each link helps you make informed decisions and ensures your garage door is functional, stylish, and built to last.
Find Your Perfect Garage Door in Sydney
Choosing the right garage door doesn’t have to be complicated. Whether you’re focused on style, space, or security, Aussie Garage Doors offers tailored solutions for every Sydney home.
🔍 Ready to explore your options? Discover our full range of garage doors and get expert advice today.