Quick Answer: Standard Dimensions
For most US homes, the standard interior door size is 32 inches wide by 80 inches tall (2’8″ x 6’8″).
- Standard Height: 80 inches (6’8″) is the universal standard.
- Standard Thickness: 1 ⅜ inches (35mm).
- Standard Widths:
- 30″ – 32″ for Bedrooms
- 24″ – 28″ for Bathrooms & Closets
- 36″ for Handicap Access (ADA)
>Pro Tip: When framing, remember the “2+2.5 Rule.” Your rough opening must be 2 inches wider and 2.5 inches taller than the door slab itself.
Quick Reference Table: Common Standard Interior Door Sizes
| Feature | US/Imperial Standard | Metric Equivalent (Approx.) | Notes |
|---|---|---|---|
| Height | 80 inches (6′ 8″) | 2032 mm | The most common standard by far. |
| 84 inches (7′ 0″) | 2134 mm | Increasingly popular in modern homes. | |
| 96 inches (8′ 0″) | 2438 mm | Often used for high ceilings, luxury feel. | |
| Width | 24 inches | 610 mm | Closets, small utility spaces. |
| 28 inches | 711 mm | Bathrooms, sometimes small bedrooms. | |
| 30 inches | 762 mm | Bedrooms, common passage doors. | |
| 32 inches | 813 mm | Common passage, meets basic accessibility. | |
| 34 inches | 864 mm | Wider passage doors. | |
| 36 inches | 914 mm | Main passage doors, often required entrance. | |
| Thickness | 1 ⅜ inches | 35 mm | Standard for most interior doors. |
| 1 ¾ inches | 44 mm | Heavier duty, exterior, some solid core. |
Standard Interior Door Sizes by Regions
| Region | Standard Height | Standard Width (Common) | Notes |
|---|---|---|---|
| USA | 80″ (2032 mm) | 32″ (813 mm) | 30″ and 36″ are also common. |
| Europe (DIN) | 1985 mm / 2110 mm | 860 mm (33.8″) | 2110 mm is the modern “tall” standard. |
| UK | 1981 mm (78″) | 762 mm (30″) | Often cited as 2’6″. |
| Japan (Modern) | 2000 mm (78.7″) | 750–850 mm | Fits the 910 mm construction grid. |
| Japan (Old) | 1800 mm (70.8″) | 700–900 mm | Based on tatami/shaku modules. |
Remember: This is just a quick overview! We’ll explore these dimensions (and more!) in much greater detail below.
Standard Interior Door Heights: Reaching New Levels
standard internal door height
80" (6'8" or 6/8)
The longtime king. Fits most standard 8' ceilings. Common in homes from the past 50-60 years: affordable, matches most openings.
Works best with: 8′ ceilings
Popularity: Widespread Standard
Check local codes for unique cases or historic homes.
84" (7' or 7/0)
Gaining ground in new builds! Adds height and drama—fits homes with 9′ ceilings. Makes rooms feel taller.
Works best with: 9′ ceilings
Popularity: On the Rise
Increasingly seen in modern, taller homes.
96" (8' or 8/0)
The luxury pick for 10'+ ceilings. Grand, modern, and premium—costs more and needs special framing.
Works best with: 10′ ceilings and up
Popularity: Signature Luxury
Seen in luxury builds, modern estates, and statement renovations.
- 80 inches (6 feet 8 inches or 6/8): This is the king! For decades, 80 inches has been the standard interior door height across the US. It fits well with standard 8-foot ceiling heights and is widely available and affordable. If you’re replacing doors in a typical home built in the last 50-60 years, chances are high they are 80 inches tall.
- 84 inches (7 feet or 7/0): Seeing a rise in popularity! As newer homes often feature higher ceilings (9 feet or more), 7-foot doors are becoming more common. They can make a room feel taller and more spacious.
- 96 inches (8 feet or 8/0): Hello, luxury! For homes with very high ceilings (10 feet or more), 8-foot doors make a dramatic statement. They feel grand and modern but come with a higher price tag and require specific framing.
- Regional Variations & Codes: While 80″ is the norm, always check local building codes! Sometimes, specific minimum heights might be required, especially for accessibility. Older homes, particularly pre-WWII, might have unique, non-standard heights. We’ll touch on handling those later!
Standard Interior Door Widths: Finding the Right Fit
Width is crucial for comfortable movement between rooms. Here’s a breakdown of common widths and where you typically find them:
Common Passage Door Widths
24 inches (2/0) Utility Size
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Usually reserved for closets, small powder rooms, or linen cupboards. Can feel quite narrow for regular passage.
Typical Uses:
Closets, pantries, linen storage
Prevalence:
Common for utility spaces
Consider if a pantry door size needs to accommodate larger items like appliances or bulk containers.
28 inches (2/4) Space-Saving
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Often used for bathrooms or smaller bedrooms where space is tight. It’s passable but can be challenging for moving furniture.
Typical Uses:
Small bathrooms, compact bedrooms
Prevalence:
Common in older homes
Consider furniture movement needs before choosing this width for bedroom doors.
30 inches (2/6) Very Common
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A very common width for bedrooms and other rooms. Offers a comfortable passage for most people.
Typical Uses:
Bedrooms, offices, studies
Prevalence:
Standard for many rooms
32 inches (2/8) ADA Compliant
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Another popular choice, especially for main passages. Importantly, this width (when paired with standard hinges) usually provides the minimum clear opening required by ADA accessibility guidelines.
Typical Uses:
Main passages, accessible rooms
Prevalence:
Very common in newer construction
This width typically meets minimum ADA requirements, providing at least 31.5″ clear opening with standard hinges.
34 inches (2/10) Less Common
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Less common than 32″ or 36″, but offers a slightly wider, more generous feel.
Typical Uses:
Intermediate passages, transitional spaces
Prevalence:
Uncommon but available
36 inches (3/0) Premium Standard
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Often used for main hallways, entryways from garages, or anywhere you might need to move large furniture or desire a more open feel. This is generally considered a very comfortable width.
Typical Uses:
Main hallways, entryways, primary bedroom
Prevalence:
Standard for main entries/passages
Building codes often require at least one primary entrance door to a dwelling to be 36 inches wide.
- Common Passage Door Widths:
- 24 inches (2/0): Usually reserved for closets, small powder rooms, or linen cupboards. Can feel quite narrow for regular passage. Consider if a pantry door size needs to accommodate larger items.
- 28 inches (2/4): Often used for bathrooms or smaller bedrooms where space is tight. It’s passable but can be challenging for moving furniture.
- 30 inches (2/6): A very common width for bedrooms and other rooms. Offers a comfortable passage for most people.
- 32 inches (2/8): Another popular choice, especially for main passages. Importantly, this width (when paired with standard hinges) usually provides the minimum clear opening required by ADA accessibility guidelines (more on that later!).
- 34 inches (2/10): Less common than 32″ or 36″, but offers a slightly wider, more generous feel.
- 36 inches (3/0): Often used for main hallways, entryways from garages, or anywhere you might need to move large furniture or desire a more open feel. This is generally considered a very comfortable width.
Standard Interior Door Thickness: Hollow vs. Solid Core
Standard Interior Door Thickness
1 ⅜ inches (35mm) – Hollow Core Standard Interior
▼
The most common and economical choice for interior doors. Lightweight construction with an internal honeycomb structure or minimal framing covered by a skin.
Weight:
Light (25-45 lbs)
Sound Dampening:
Minimal
Cost:
Low to moderate
Lightweight and easy to handle
Compatible with standard hardware and jambs
Available in various styles and finishes
Typically more affordable option
Ideal for bedrooms, closets, and other interior rooms where sound insulation is less important.
1 ⅜ inches (35mm) – Solid Core Premium Interior
▼
Heavier, denser construction, often filled with particleboard or engineered wood. Offers much better sound dampening and feels more substantial.
Weight:
Heavy (50-70 lbs)
Sound Dampening:
Good to excellent
Cost:
Moderate to high
Substantial feel with quality heft
Superior sound insulation properties
Better durability and longevity
Enhanced temperature insulation
Excellent for bathrooms, home offices, or bedrooms where sound privacy is important.
1 ¾ inches (44mm) Heavy-Duty
▼
Less common for interior applications but used for specific purposes where durability, security, or fire safety is a priority.
Weight:
Very heavy (70-100+ lbs)
Sound Dampening:
Excellent
Cost:
High
Enhanced security properties
Often used for fire-rated applications
Standard for most exterior doors
Can support high-end solid wood construction
Typically used for workshop doors, high-security rooms, high-end applications, or where building codes require specific fire ratings.
Door Thickness & Wall Depth
- Standard Thickness: Interior doors are almost always 1 ⅜ inches thick. (Exterior doors are thicker at 1 ¾ inches).
- Jamb Width (Wall Depth): The door frame must match your wall thickness.
- 4 ⁹/₁₆” Jamb: For standard 2×4 walls with drywall.
- 6 ⁹/₁₆” Jamb: For 2×6 walls (common in plumbing walls or exterior walls).
Rough Opening Calculator (Don’t Get This Wrong!)
The Rough Opening (R.O.) is the framed hole in the wall before the door jamb is installed. If your R.O. is too small, your door frame will not fit.
The Golden Formula:
- R.O. Width = Door Width + 2 Inches
- R.O. Height = Door Height + 2.5 Inches
Example for a standard 30″ x 80″ door:
- Width: 30″ + 2″ = 32″ R.O. Width
- Height: 80″ + 2.5″ = 82.5″ R.O. Height
Why the extra space? You need room for the door jambs (3/4″ each side) and shims to level the door.
Special Interior Door Types
Not all doors swing on hinges. Consider these space-saving alternatives:
- Pocket Doors: Slide into the wall. They use standard slab sizes (e.g., 30×80) but require a rough opening that is double the width + 1 inch.
- Barn Doors: Slide over the wall. The door slab should be wider than the opening (e.g., use a 34″ door for a 30″ opening) to block light gaps and ensure privacy.
- French Doors: Two doors side-by-side. A pair of 30″ doors creates a 60″ wide grand opening. Perfect for home offices or dining rooms.
Custom Sizes & Non-Standard Openings
Do you live in an older home with weird door sizes like 78 inches or 29 inches?
Big box stores only stock standard sizes. If you try to trim a standard hollow-core door too much, you will cut through the frame and ruin it.
The Hotian Solution:
Don’t rebuild your walls. [Order Custom Sized Interior Doors Direct]. We manufacture doors to exact 1/8th inch specifications, so you can slide a new door into an old frame without the mess of construction.
Interior Door Size FAQs
What is the most standard interior door size?
The most common standard is 30 inches wide by 80 inches tall (2/6 x 6/8) with a thickness of 1 ⅜ inches. 32″ x 80″ is also extremely common.
How much bigger should the rough opening be than the door?
Generally, the rough opening should be 2 inches wider and 2 to 2.5 inches taller than the door slab size.
Can I put a 32-inch door in a 30-inch opening?
No, not without reframing the opening to make it wider (creating a 34-inch rough opening).
Do I need a solid core door?
You need one if code requires it (like for fire-rating). You want one if you value sound reduction, a heavier feel, or better durability. Hollow core is fine for many standard, low-traffic areas if budget is key.
What’s the difference between a pre-hung door and a slab door?
A slab is just the door itself. A pre-hung door comes already mounted in its frame (jambs), often with hinges attached, making installation easier.
How do I measure for a replacement door?
Measure the existing door slab’s actual width, height, and thickness. Also measure the jamb width (wall thickness).
What is the minimum door width for a bedroom?
Building codes vary, but 30 inches is common and comfortable. Some codes might allow 28 inches. Always check your local code.
Are 7-foot doors (84 inches) becoming standard?
They are becoming much more common, especially in new construction with higher ceilings, but 80 inches (6’8″) remains the most widespread standard size.
Can I trim a standard door to fit a smaller opening?
You can often trim a small amount (maybe ½ inch total) off the bottom or sides of solid wood or solid core doors.
Hollow core doors have minimal solid wood framing inside, so trimming is very limited (often only ¼ inch or so) before you hit the hollow part. Always check the manufacturer guidance.
Hollow core doors have minimal solid wood framing inside, so trimming is very limited (often only ¼ inch or so) before you hit the hollow part. Always check the manufacturer guidance.
What size door is needed for wheelchair access?
You need a minimum 32-inch clear opening width. This usually requires a 36-inch wide door slab.
Key Takeaways:
- Measure Carefully: Accurate measurements (width, height, thickness, jamb width) are non-negotiable! Measure multiple points.
- Know the Standards: 80″ height is king, but taller options exist. Common widths serve different room functions. 1 ⅜” thickness is typical.
- Rough Opening is Key: It must be larger than the door unit (usually +2″ width, +2″ to 2.5″ height).
- Consider Type & Function: Choose a door type (hinged, sliding, folding) and core (hollow/solid) that suits the room’s needs and your preferences (sound, budget).
- Think Ahead: Consider accessibility and future needs when selecting widths.
Choosing the right interior doors is a blend of understanding the technical standards and considering your home’s unique style and needs. By paying attention to dimensions and planning carefully, you can ensure your doors look great, function perfectly, and enhance your living space for years to come.
And remember, if you need a specific size that’s hard to find, you can always explore options to order interior door from us.
Good luck with your project! You’ve got this!
