Most doors are prepped standard, with a thickness of between 1 3/4" to 2" thick.
The standard door thickness for interior doors is 1 ⅜ inches, though if your interior door is taller than 80 inches or wider than 36 inches, the recommended thickness by building codes increases to 1 ¾ inches. Closet doors are narrower and aren't required to meet the standard interior door building codes.
Most exterior doors have a thickness of 1.75", which is considered the standard thickness to help keep your home secure and make sure your door is able to hold up against weather events. For context, the standard thickness for interior doors is about 1.38".
Standard thickness is 1.375″, 1.75″, 2″ and 2.25″. Solid core: Solid core doors are available in the following widths: 1'0″, 1'2″, 1'3″, 1'4″, 1'6″, 1'8″, 1'10”, 2'0″, 2'2″, 2'4″, 2'6″, 2'8″, 2'10”, 3'0″. They can be made in the following heights: 6'8″, 7′, 8′.
Their thickness is a crucial factor that varies widely to accommodate different architectural styles, security needs, and climatic conditions. Understanding the spectrum of thickness options available can help you tailor your choice to your home's specific requirements.
Watch our tiktok channel if you lazy to read. In Singapore the 3 standard carpentry thickness are: 12mm, 15mm & 18mm. For carpentry doors, the standard thickness is 18mm. For shelves, most people will use 15mm.
Standard Door Thicknesses
As with size, door thickness varies from door to door, and for specific uses. The most common thickness of an internal door is 35-40mm, but some fire doors go up to 54mm.
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Historically, 8' doors (in fact almost all fine interior doors) have always been 1-3/4.
The standard size for a door frame is 80 inches by 36 inches, with the rough opening slightly larger at 82 inches by 38 inches. This standard size can vary depending on how tall are standard doors, the type of door, as well as the specific measurements of your home.
An external door should be between 40-45mm thick. Ideally, the thicker the door, the better. A thicker exterior door will provide better protection from the elements and could potentially provide better insurance against potential intruders.
Standard Size for Interior Doors
The height for all passage doors must be a minimum of 80 inches and the standard width sizes for interior doors are 24”, 28”, 30”, 32” and 36”. The minimum recommended door width to allow persons with disabilities' to pass through is 36 inches.
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Looking ahead to 2025, the reasons for the enduring popularity of Shaker doors are clear. They offer a timeless appeal that transcends fleeting trends, ensuring they remain a wise investment for homeowners aiming for both style and functionality.
3/4" Thick Standard door thickness for butt joint doors. Strong and stable for most standard cabinet door sizes. 7/8" Thick Standard door thickness for miter joint doors. Stately and significant allowing for more detailed designs.
The standard interior door thickness is 1⅜ inches.
This is the most common interior door thickness.
The typical standard door thickness is about 35mm to 40mm for interior doors, while exterior doors might be slightly thicker, ranging from 35mm to 45mm on occasion, to enhance security and insulation.
In any residential building, every interior door in a doorway through which occupants pass shall have a minimum width of 32 inches (812.8 mm).
Interior doors are typically 1-3/8″ thick and their purpose is to divide interior rooms. Exterior doors are typically 1-3/4″ thick, are constructed to withstand the outdoor elements and provide security and insulation between the inside and outside temperature differences.
Internal Doors: 35mm - 40mm thick. Internal Fire Doors: 35mm - 54mm thick.
Conclusion. All commercial hollow metal doors are 1-3/4” thick, while residential hollow metal doors are 1-3/8” thick.
Most interior doors are either going to be 1 3/8 inches or 1 3/4 inches thick. And of those two sizes 1 3/8 is much more common.
Re: What thickness plywood for doors panels
personally I would suggest 1/4 for lightness, and looks.
Doors and Windows
The most commonly used door trim casing size is 2 ¼ inches in width and ½ thick, although these numbers will regularly go upwards in the ½ inch range. Although it's standard practice to have door and window casings the same size, there is absolutely no real set of factors forcing this.