What is the Standard Door Thickness?

The standard door thickness is typically 1 3/8 inches in the United States, which includes both interior and exterior doors. This is also referred to as a 45mm door thickness. Exterior doors may be thicker than interior doors, usually up to 2 inches thick.

The extra material helps provide insulation against the elements and added security against forced entry. Most hollow-core interior doors are slightly thinner at 1 3/8 inch thick or even less depending on the manufacturer’s specifications. Other components such as frames, trim moldings, hinges, and locksets will add additional depth to the overall thickness of a doorway opening where they are installed.

The standard door thickness is 1 3/8 inches, which provides a durable and secure barrier between two spaces. This thickness allows for optimal insulation against sound, temperature regulation, and entry security. With multiple layers of wood or metal construction combined with weather stripping and other products to increase performance, the 1 3/8 inch standard can provide an effective barrier that will stand up to years of use.

Door Thickness 1-3/4 Inch VS 1-3/8 Inch Doors – Doors FAQ


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What is the Standard Door Thickness

The standard door thickness for interior doors is 1 3/8 inches thick. This thickness is designed to provide soundproofing, security, and durability. The most common material used in the construction of interior doors is wood or fiberglass, although other materials such as steel are also available.

The 1 3/8 inch thickness provides enough room for a door lock while still providing an aesthetically pleasing look that blends with the surrounding decor. Additionally, this thickness is also able to withstand normal wear and tear from regular use without becoming easily damaged or dented over time. For exterior doors, a thicker door may be more necessary due to increased exposure to weather and environmental elements; therefore these types of doors typically range between 1 ¾ inches – 2 ½ inches thick depending on the area’s climate conditions and desired level of protection needed by the homeowner.

The Typical Standard Interior Door Thickness is 1 3/8 Inches Or 35Mm

When an interior door is installed in a home, it’s important to make sure that the door has enough thickness for its intended purpose. The typical standard for interior doors is 1 3/8 inches or 35mm thick. This thickness provides adequate durability and insulation against sound transmission through the door, while also allowing room for necessary hardware such as hinges and locksets.

Additionally, this standard size allows most modern pre-hung doors to fit properly into existing frames without having to modify them. While some people may choose thicker doors based on their particular needs, 1 3/8 inch or 35mm remains the preferred standard when it comes to home improvement projects involving new interior doors.

Exterior Doors May Vary in Size But Generally Range between 1 ¾ to 2 ½ Inches (44-64 Mm)

When it comes to selecting exterior doors for your home, size is an important factor to consider. Exterior doors may vary in size but generally range from 1 ¾ inches (44 mm) up to 2 ½ inches (64 mm). The most common door sizes are 30-inch, 32-inch, and 36-inch widths for single entryways; double entryways typically measure 60-inches or 72-inches wide.

Door heights vary as well with the standard being 80 inches tall, although some homes have taller door frames that require taller doors. It’s important to note that when replacing a door you will also need to replace any existing trim around the frame of the old door with new trim of a matching size. Depending on local codes and regulations you may be required by law to install specific types of weather stripping materials such as foam tape or rubber seals around the edges of your newly installed door.

What is the Standard Door Thickness

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Door Thickness Mm

The standard thickness of a door is usually between 35mm and 45mm, depending on the type of door. The thicker the door, typically the better the insulation it provides. In addition to thermal insulation, thicker doors can also provide soundproofing benefits and increased security against forced entry.

Standard Door Size in Mm

The average standard door size in mm is 2050mm x 960mm. This measurement includes the door trim and jamb, which adds roughly 6-20 mm to the overall height and width of the door. The extra space allows for the proper installation of hinges, locksets, weatherstripping and other hardware.

Keep in mind that these measurements are only a guide as there can be slight variations depending on your specific needs or requirements.

Exterior Door Thickness

The thickness of an exterior door can range from 1 3/8” to 2 ¼”. The thicker the door, the more protection it will provide against outside elements such as weather, sound, and security. It also offers better insulation value due to its increased density.

Thicker doors are generally more expensive than thinner ones but they offer greater durability and strength as well as a higher quality look and feel.

Standard Interior Door Thickness

The standard thickness of an interior door is 1 3/8 inches. This includes both the door slab, as well as any trim or molding that may be attached to it. Interior doors can also range in thickness from 1 3/8 inches to 2 ¼ inches, depending on the size and type of door being installed.

Standard Door Width Interior

The standard width of an interior door is typically 32 inches, but this may vary depending on the type of door and its intended purpose. Interior doors that are designed to be used as privacy doors will usually have a wider width than those used for closets or other non-private purposes. Additionally, some homes may install custom doors with different dimensions to meet specific needs.

Standard Exterior Door Size

Standard exterior door sizes are typically 80 inches tall by 34 or 36 inches wide. This is the most common size for residential homes, although some may be slightly larger or smaller depending on the age of the home and local building codes. It’s important to measure your existing door frame before purchasing a new one as there can be variations in standard sizes.

Standard Door Width Cm

The standard door width in centimeters is usually between 71 and 81 cm. Of course, this can depend on the type of door you are looking at. For example, an exterior residential entry door typically has a standard width of 90 cm while interior doors have a more narrow range from 60 to 75 cm.

It’s important to take into account the specific needs of your project when deciding on the right size for your doorway!

Standard Door Size in Feet

The most common standard door size in feet is 80 inches by 36 inches, which is the same as 6.67 feet by 3 feet. This size fits a standard doorway opening and can be used for both interior and exterior doors. It is also important to note that these sizes are not always exact; some manufacturers may slightly vary in their measurements.


In conclusion, it is clear that the standard door thickness can vary depending on the type of door and its purpose. Solid core doors are usually thicker than hollow core doors, while exterior doors tend to be thicker than interior ones. It’s important to remember that a general rule of thumb is that a 1 3/8 inch thick or 35 mm door is considered standard for most residential construction projects.

However, always refer to your local building codes when selecting your desired door thickness before you make any purchase decisions.

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