Choosing a new wrought iron door is an exciting way to enhance your home's curb appeal, security, and architectural style. However, before ordering a custom iron door, accurate measurements are one of the most important steps to ensure a proper fit.
Unlike standard stock doors, wrought iron doors are often custom-made based on your home's existing opening. Understanding how to measure your entry opening correctly will help avoid installation issues and ensure your new door fits perfectly.
This guide will walk you through the key measurements you need before purchasing a wrought iron front door.
1. Understand the Difference Between Door Size and Rough Opening Size
One of the most common mistakes when ordering a custom iron door is confusing the door unit size with the rough opening size.
The door unit size refers to the complete pre-hung door system, including:
- Door slab(s)
- Frame/jambs
- Threshold
The rough opening (RO) is the opening in your wall where the complete door unit will be installed.
For most installations, we recommend the rough opening to be:
- At least 1" wider than the door unit width
- At least 1/2" taller than the door unit height
This allows enough space for proper installation, leveling, and adjustments.
Example Rough Opening Requirements for Pre-Hung Iron Doors:
| Door Unit Size(W*H) | Recommended Rough Opening (RO)(W*H) |
|---|---|
| 36" × 80" Single Door | Approx. 37" × 80 1/2" |
| 42" × 80" Single Door | Approx. 43" × 80 1/2" |
| 48" × 96" Single Door | Approx. 49" × 96 1/2" |
| 60" × 80" Double Door | Approx. 61" × 80 1/2" |
| 72" × 80" Double Door | Approx. 73" × 80 1/2" |
| 72" × 96" Double Door | Approx. 73" × 96 1/2" |
| 84" × 96" Double Door | Approx. 85" × 96 1/2" |
2. Measure the Width of the Opening
To measure the width:
- Measure the opening at the top
- Measure the opening at the middle
- Measure the opening at the bottom
Record the smallest measurement.
For example:
- Top: 72 1/4"
- Middle: 72"
- Bottom: 71 7/8"
Your usable opening width should be based on the smallest measurement.
For double doors or doors with sidelights, measure the entire opening width, including all sections.
3. Measure the Height of the Opening
Measure the height from:
The highest point of the finished floor/threshold bottom area to the top of the opening
Take measurements on:
- Left side
- Center
- Right side
Use the smallest measurement.
Keep in mind:
- Flooring changes
- Existing thresholds
- Trim and molding
can affect the final door size.
4. Check Your Wall Thickness and Jamb Depth
The jamb depth should match the thickness of your finished wall, not only the wall framing size.
Common jamb sizes include:
- 4 9/16" jamb – commonly used for standard 2×4 wall construction
- 6 9/16" jamb – commonly used for 2×6 wall construction
- Custom jamb sizes are available for walls with different thicknesses
Before ordering your door, we recommend measuring the actual wall thickness or consulting with your installer to confirm the correct jamb size.
5. Consider Door Swing Direction
Before finalizing your order, confirm:
- Inswing or outswing
- Left-hand or right-hand operation
The available space around your entry affects the swing direction.
Check for:
- Interior walls
- Furniture
- Stairs
- Exterior landscaping
- Walkways
A door may not be able to open fully if there are obstacles nearby.
6. Should You Measure the Door Yourself?
Many homeowners can take basic measurements themselves. However, because wrought iron doors are heavy and custom-made, we recommend having an experienced contractor or installer verify the final measurements before production.
A professional installer can help confirm:
- Rough opening size
- Installation requirements
- Swing direction
- Structural conditions
Ready to Order Your Custom Wrought Iron Door?
Accurate measurements are the first step toward creating a beautiful and properly fitted entry door.
If you are planning a custom wrought iron door project, send us your opening measurements, door design preferences, and project details. Our team will review your requirements and help recommend the best configuration for your home.
