Standard Door Sizes: The Ultimate Guide to Width & Height

What Are the Most Common Standard Door Sizes?

Standard Interior Door Sizes

• Standard Interior Door Height:
  • The most common height is 80 inches.
  • That’s 6 feet and 8 inches tall. People call this a “six-eight” or 6/8 door.
  • Sometimes you see taller doors, like 84 inches (7 feet) or 96 inches (8 feet), especially in new homes with high ceilings. These are tall interior door standard heights. But 80 inches is the main standard interior door height.
• Standard Interior Door Width:
  • Width changes depending on the room.
  • 32 inches is very common for bedroom doors and other rooms.
  • 30 inches is also a popular standard interior door width.
  • 28 inches is often used for bathrooms or smaller rooms.
  • 24 inches is a frequent standard closet door size.
  • Sometimes, you might see a 36-inch interior door, maybe for a main hallway or for easier accessibility (like for wheelchairs – see ADA door width requirements). These are common residential door widths.
• Standard Interior Door Thickness:
  • Most standard interior doors are 1 3/8 inches thick. This is true for standard hollow core door thickness and often for standard solid core door thickness, too.

Standard Exterior Door Sizes (Front/Entry Doors)

• Standard Exterior Door Height:
  • Just like inside doors, the most common height is 80 inches (6 feet 8 inches, or 6/8).
  • Yes, you can find taller exterior doors (84″, 96″), but 80 inches is the main standard exterior door height.
• Standard Exterior Door Width:
  • The most common standard exterior door width is 36 inches (3 feet, or 3/0). This wider size makes moving furniture easier.
  • You might sometimes see 30-inch or 32-inch exterior doors, maybe for a back door or garage door standard size, but 36 inches is the typical standard entry door dimension.
• Standard Exterior Door Thickness:
  • Exterior doors are usually thicker for strength, security, and insulation.
  • The standard door thickness exterior is 1 3/4 inches. A soundproof door standard thickness might be even more.

How to Measure for a Standard Door (The Right Way)

Measuring the Door Slab Only (If Replacing Just the Door)

• This is if your door frame is good, and you only need a new door panel (the door slab).
• Use a tape measure.
• Width: Measure the width of the door slab itself (left edge to right edge). Do this in 3 places (top, middle, bottom). Use the widest measurement if they differ slightly.
• Height: Measure the height of the door slab (top edge to bottom edge). Do this in 3 places (left, middle, right). Use the tallest measurement.
• Thickness: Measure the thickness of the door edge. This is usually 1 3/8 inches (interior) or 1 3/4 inches (exterior).

Measuring the Rough Opening (For New Doors or Pre-Hung Units)

• What is a Rough Opening? It’s the hole in your wall before the door frame (jambs) is put in. It’s the space between the wood studs. This is important for new construction or when putting in a whole new door and frame (pre-hung door).
• Rough Opening Width: Measure the space between the vertical wood studs. Measure at the top, middle, and bottom. Use the smallest measurement.
• Rough Opening Height: Measure the space from the floor (the subfloor, not the carpet or tile) up to the bottom of the horizontal wood piece (header) at the top of the opening. Measure on the left, middle, and right. Use the smallest measurement.
• Standard Rough Opening Size: The rough opening for standard door needs to be bigger than the door itself to leave room for the frame (standard door frame sizes) and shims (small wood pieces to make it level).
  • General Rule:
    • Rough Opening Width = Door Width + 2 inches
    • Rough Opening Height = Door Height + 2 inches to 2.5 inches
  • Example: For a standard 36″ x 80″ exterior door, you need a rough opening around 38 inches wide and 82 to 82.5 inches high. Always check the door manufacturer’s recommendation! A standard door framing guide can help.

Measuring for a Pre-Hung Door

• A pre-hung door comes with the door slab already hanging on hinges in its frame. It’s often easier to install.
• To buy a pre-hung door, you need the Rough Opening measurements (see step 2).
• You also need to know your wall thickness (usually 4 9/16 inches) to get the right jamb width.
• And you need to know the “handing” (which way the door swings).

Understanding Door Size Terminology (Simple Words)

• Door Slab: Just the door itself. No frame, no hinges. These are door slab standard dimensions.
• Pre-Hung Door: The door slab + the door frame (jambs) + hinges, all put together. Ready to install into a rough opening. Pre-hung door standard sizes refer to the door slab size they contain.
• Rough Opening: The hole in the wall studs where the door and frame will go.
• Door Frame: The wood parts around the door (standard door frame sizes).
• Jamb: The sides and top part of the door frame. Standard door jamb dimensions match wall thickness.
• Casing: The decorative wood trim around the door frame. Standard interior door casing width varies by style.
• Threshold: The piece on the floor under an exterior door. Standard threshold height for doors needs to allow the door to seal.
• 6/8, 3/0, etc.: This is standard door size notation. It means “Feet / Inches”.
  • 6/8 (or 3068 if width is 30″) = 6 feet, 8 inches tall (80 inches). This is the standard door height in feet.
  • 3/0 (or 3068 if height is 80″) = 3 feet, 0 inches wide (36 inches). This is a standard door width.
  • A “3068 door” is 3 feet 0 inches wide (36″) and 6 feet 8 inches high (80″). Understanding door size codes is easy once you know the pattern!

Standard Sizes for Other Common Door Types

• Closet Doors (Bifold/Sliding):
  • Bifold doors (that fold in half) often come in standard pairs to fit openings of 24″, 30″, 36″, 48″, 60″, or 72″ wide. The bifold door standard sizes refer to the opening they fit.
  • Sliding closet doors usually use standard interior door widths like 24″, 30″, or 36″ for each panel.
  • Height is typically the standard 80 inches.
• French Doors (Interior/Exterior):
  • They usually use two standard size door slabs. For example, two 30-inch doors make a 60-inch opening (a “5/0″ opening). Two 36-inch doors make a 72” (“6/0”) opening. This is the standard double door opening width.
  • Height is typically the standard 80 inches or taller options. See interior French door standard sizes.
• Sliding Glass Doors / Patio Doors:
  • These often slide on a track.
  • Common standard sliding glass door sizes (width): 60 inches (5/0), 72 inches (6/0), 96 inches (8/0). The standard patio door width can vary.
  • Height is usually the standard 80 inches (6/8).
• Pocket Doors:
  • These doors slide into the wall.
  • They use standard interior door slab sizes (like 30″ or 32″ wide, 80″ high). The pocket door standard width refers to the door itself.
  • BUT, they need a much wider rough opening to build the “pocket” frame inside the wall.
• Other Doors: Standard screen door sizes and standard storm door dimensions usually match common exterior door sizes (like 36×80 or 32×80). Standard barn door sizes vary greatly but often use standard heights. Standard mobile home door sizes can sometimes be non-standard. Standard fire door sizes must meet specific building code rules.

What If My Door Isn’t a Standard Size?

Okay, you measured carefully. Uh oh. Your door opening doesn’t match any standard size. Maybe you live in an older home? Historic home door sizes (vs standard) are often unique. You need a door, but standard won’t work. Replacing non-standard size door feels impossible!

Are you stuck? Do you have to pay a lot to change the wall and the opening? That sounds like a big, messy job! You just want a door that fits your space. Stores only offer standard. You feel frustrated. There’s variance in standard door sizes sometimes, but your opening is way off.

Don’t panic! Boswindor has the perfect answer! This is where we shine. We are experts in making custom-sized doors and windows.

• We Build to Your EXACT Size: Tell us the width and height you need, down to the fraction of an inch or millimeter. We will manufacture a beautiful, high-quality door that fits perfectly. No need for costly wall changes!
• Any Style, Any Size: Want a custom wood door? A modern steel door? A special French door? We can make it in the custom size you need. We understand the difference between standard and custom doors and excel at both.
• Perfect for Old Homes & Unique Designs: Our custom doors are ideal for historic home door sizes or unique architectural plans. Get the look you want with the perfect fit.
• Windows Too!: Boswindor doesn’t just make doors. We are also a leading windows manufacturer. Need custom size windows to match your custom doors? We do that too!

So, if standard doesn’t fit, Boswindor is your solution. We make getting the perfect custom size easy and affordable. Check out our wide selection and learn about Boswindor aluminum doors that combine style and strength, available in standard and custom dimensions.

Boswindor: Your Partner for ALL Doors (Standard & Custom)

Why choose Boswindor?

• We Are the Manufacturer: We make the doors ourselves in China. This means better quality control and the best prices.
• Standard AND Custom: We offer the best of both worlds. Need a quick, affordable standard size door? We have them. Need a special custom size? We are experts!
• Quality Materials: We use great wood, steel, aluminum, and glass. Our doors are built to last.
• Many Styles: Modern, classic, simple, fancy – we have designs for every taste. Explore options like our sleek Boswindor aluminum casement windows, perfect companions to modern door styles.
• Global Reach: We understand US standard door sizes, UK standard door sizes metric, European standard door sizes, Canadian standard door sizes, and Australian standard door sizes. We ship globally.
• Beyond Doors: Remember, we also make high-quality windows. Consider pairing your door purchase with energy-saving options like our Boswindor thermal break windows for complete home comfort.

Boswindor combines manufacturing strength with the flexibility to meet your specific needs, whether standard or fully custom. We are committed to providing excellent doors and windows. Contact us now to get a free quote!

Quick Standard Door Size FAQ

Conclusion

Understanding standard door size doesn’t have to be confusing! Knowing the common width, height, and thickness for interior and exterior doors makes your project much easier. Remember the standard 80-inch height, the common 36-inch exterior width, and typical interior widths like 32 or 30 inches. Always measure carefully!

Whether you need a readily available standard size door or a unique custom size door or window, Boswindor is your trusted manufacturer. We provide quality, choice, and the perfect fit for your home. Let Boswindor help you open the door to your perfect space!