Size Measurement Guide: What Every Homeowner Should Know

2024-01-05 6 min read

Whether you're replacing an old garage door or installing one in new construction, accurate measurements are crucial for a proper fit. This guide will walk you through everything you need to know about measuring for a garage door.

Why Accurate Measurements Matter

An improperly sized garage door causes numerous problems:

- Gaps that let in weather, pests, and intruders, Binding or rubbing against the frame, Premature wear on components, Safety hazards, Void warranties

Tools You'll Need

Before starting, gather these items:

- Tape measure (25 feet recommended) - Step ladder, Notepad and pen, Level, Flashlight

The Essential Measurements

1. Opening Width

Measure the width of the garage door opening at the widest point:

- Measure at floor level, Measure at the middle of the opening, Measure at the top, Use the largest measurement

Standard widths: 8', 9', 10', 12', 16', 18' (single and double doors)

2. Opening Height

Measure the height from the floor to the header:

- Measure on both sides, Measure in the center, Use the smallest measurement

Standard heights: 7', 8' (most common residential sizes)

3. Side Room (Left and Right)

This is the space between the door opening and the side walls:

- Measure from each side of the opening to the nearest obstruction, Minimum required: 3.75" - 5.5" depending on track type

4. Headroom

The space between the top of the door opening and the ceiling:

- Measure from the header to the ceiling or lowest obstruction, Minimum required: 10" - 15" depending on opener type, Low-headroom tracks available for tight spaces

5. Backroom (Depth)

How far back the door extends when open:

- Measure from the header into the garage, Should equal door height plus 18" minimum, More depth needed for high-lift or vertical-lift configurations

Special Considerations

Existing Door Replacement

If replacing an existing door:

- Measure the actual door, not just the opening, Note the door's thickness, Check if current tracks are standard or special

Uneven Floors

Many garage floors slope for drainage:

- Measure height at multiple points, Note the slope direction, Bottom weather seal can accommodate minor variations

Obstructions

Document anything that might interfere with installation:

- Light fixtures, Pipes or ductwork, Electrical panels, Water heaters, Storage shelves

When to Call a Professional

While taking preliminary measurements yourself is helpful, we always recommend a professional measurement before ordering. Our free in-home estimates include:

- Precision measurements with professional tools, Assessment of structural conditions, Recommendations for track configurations, Discussion of door style options, Written quote with no hidden fees

Ready to Replace Your Garage Door?

Contact Garage Door Wilmot at 1-330-977-5095 for a free measurement and estimate. Our experts will ensure you get the perfect fit for your new garage door.

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