Standard Door Dimensions Explained: Width, Height & Sizes for Every Door Type
Whether you’re renovating your home, replacing a damaged door, or building from scratch, understanding door dimensions is a must. A door that’s too wide or too narrow can cause headaches during installation, and may not even meet building codes. By learning about standard door sizes, you can save time, money, and effort in your next home improvement project.
In this guide, we’ll walk you through the standard width, height, and other key measurements for different types of doors, so you can make informed decisions and avoid common mistakes.
What Are the Standard Door Dimensions in the U.S.?
In the United States, most door dimensions follow standard measurements that simplify construction and replacement. Here’s a quick overview of typical sizes:
| Door Type | Width (inches) | Height (inches) | Thickness (inches) |
|---|---|---|---|
| Interior Door | 28–32 | 80 | 1 3/8″ |
| Exterior Door | 36 | 80–96 | 1 3/4″ |
| Sliding Door | 60–96 | 80–96 | N/A (glass panels) |
These dimensions serve as a general guideline, but always measure before making a purchase.
Standard Interior Door Sizes
Interior doors connect rooms within your home—like bedrooms, bathrooms, closets, and hallways. The most common width for interior doors ranges from 28 to 32 inches, with 30 inches being the most standard. The standard height is typically 80 inches.
Common widths for interior doors:
- 24 inches (closets or small bathrooms)
- 28 inches
- 30 inches (most bedrooms)
- 32 inches (main hallway doors)
- 36 inches (ADA accessible rooms)
Older homes may have smaller or less consistent door sizes, so always measure first.
Standard Exterior Door Dimensions
Wider exterior doors allow easier access for moving furniture and improve curb appeal. If you’re also considering upgrading your garage access, check out our detailed Garage Door Sizes Guide for standard dimensions and tips.
Exterior Door Specs:
- Width: 36 inches (can go up to 42 for double doors)
- Height: Standard is 80 inches, but 84 or 96 inches is common in modern homes
- Thickness: 1 3/4 inches (for better durability and insulation)
Sliding Glass Door Dimensions
Sliding doors are a popular choice for patios and backyard access. They offer large, open views and easy outdoor access without swinging into a room.
Common sliding door sizes:
- Width: 60, 72, or 96 inches
- Height: 80, 82, or 96 inches
A 72-inch wide sliding door is the most standard size, accommodating two glass panels: one fixed and one sliding. Taller doors are often used in modern homes with high ceilings to create a spacious, airy feel.
ADA-Compliant Door Dimensions (Wheelchair Access)
If your home needs to be accessible for someone using a wheelchair, it should follow ADA (Americans with Disabilities Act) standards. These regulations recommend:
- Minimum door width: 36 inches (3 feet)
- Clear opening when open: At least 32 inches
These standards apply to both interior and exterior doors. If you’re remodeling for accessibility, consider upgrading all major doorways for comfort and convenience.
How to Measure a Door Correctly
Even with standard dimensions, no two homes are the same. Proper measurement is crucial for a perfect fit. Here’s how to measure your door like a pro:
1. Measure the Width at Three Points:
- Measure across the top, middle, and bottom of the door frame.
- Use the smallest measurement to ensure the door fits properly.
2. Measure the Height:
- Measure from the floor to the top of the frame.
- Don’t forget to include the threshold if it’s part of the frame.
3. Check the Door Thickness:
- Standard interior doors are 1 3/8 inches thick.
- Exterior doors are usually 1 3/4 inches.
4. Account for Swing Clearance:
- Make sure there’s enough space for the door to swing open without hitting walls or furniture.
Common Questions About Door Sizes
Q: What is the most common interior door width?
A: 30 inches is the most commonly used width for bedroom and bathroom doors.
Q: Are all doors 80 inches tall?
A: Most are, but modern homes may feature 84 or 96-inch tall doors.
Q: What size door do I need for a wheelchair?
A: A 36-inch wide door ensures wheelchair accessibility.
Q: Can I replace a 30-inch door with a 32-inch one?
A: Yes, but you may need to resize the frame and adjust the wall opening.
Custom Door Dimensions: When and Why
While standard sizes work for most homes, some situations require custom doors:
- Older homes with non-standard frames
- Luxury or modern homes with taller ceilings
- Special design preferences (arched tops, barn doors, etc.)
- ADA accessibility upgrades
Custom doors offer more flexibility but come with a higher price tag and longer lead times.
Final Thoughts: Get the Right Fit
Knowing standard door dimensions helps you plan better, avoid costly mistakes, and ensure smoother installation. Whether you’re replacing an old door or choosing one for a new home, accurate measurements are key.
If you’re unsure, work with a professional installer or supplier to confirm sizes and find the perfect fit. Choosing the right door size improves both functionality and aesthetic appeal in any space.
Stay informed, measure wisely, and you’ll be one step closer to your perfect door!
