Size Measurement Guide: What Every Homeowner Should Know
2024-01-05 6 min read
Whether you're planning a garage door replacement or a new installation, accurate measurements are essential for a successful project. Incorrect measurements can lead to doors that don't fit, increased costs, and delays. This comprehensive guide will help you measure your garage door opening like a professional.
Why Accurate Measurements Matter
Garage doors are not one-size-fits-all. They come in standard sizes, but your opening may require a custom fit. Getting measurements wrong can result in:
- Ordering the wrong size door
- Gaps that let in drafts, pests, and moisture
- Doors that don't operate properly
- Additional construction costs to modify the opening
Tools You'll Need
Before you start measuring, gather these tools:
- A quality tape measure (at least 25 feet long)
- A ladder for reaching high points safely
- A pencil and notepad or smartphone for recording measurements
- A level (optional but helpful)
The Essential Measurements
1. Width of the Opening
Measure the width at the widest point of the opening, from one inside edge of the frame to the other. Take measurements at both the floor level and at the height where the door will seal. If there's a difference, use the larger measurement and note both.
2. Height of the Opening
Measure from the floor to the underside of the header (the beam across the top of the opening). Again, measure on both sides as floors and headers can be uneven. Use the larger measurement.
3. Side Room (Sideroom)
This is the space on either side of the opening for the vertical tracks. Measure from the edge of the opening to the nearest obstruction (wall, pipe, etc.) on each side. Standard tracks require about 3.75 inches, though some systems need more.
4. Headroom
Measure from the top of the door opening to the ceiling or nearest obstruction. This space is needed for the horizontal tracks and opener. Standard installations require 10-12 inches, though low-headroom options are available for spaces with less clearance.
5. Backroom (Depth)
Measure the depth of the garage from the door opening to the back wall. Your garage door, when fully open, will extend into this space. Generally, you need depth equal to the door height plus 18 inches.
Standard Garage Door Sizes
While custom sizes are available, most residential garage doors fall into these standard dimensions:
- Single car: 8' x 7', 9' x 7', or 10' x 7'
- Double car: 16' x 7', 18' x 7', or 16' x 8'
- RV/Oversized: Various sizes up to 20' wide and 12' tall
Tips for Accurate Measuring
- Measure twice, record once
- Round up to the nearest 1/4 inch
- Check for level and plumb, an out-of-square opening affects installation
- Note any obstructions like lights, outlets, or pipes
- Take photos of the opening and surrounding area
When to Call a Professional
While measuring is something most homeowners can do, there are situations where professional help is valuable:
- The opening appears to be out of square
- You're considering a non-standard door type
- There are potential obstruction issues
- You're unsure about any of your measurements
At Troy Garage Doors, we offer free in-home consultations where our experts will take precise measurements and help you choose the perfect door for your home. Contact us today to schedule your consultation.
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