Resolved! Standard Size For Doors

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Shop for the right-sized entry and interior doors to suit your home remodel or new construction, and learn about the most reasonable DIY projects.

Doors and windows

Resolved! China WDMA Standard size for doors. Shop for the right-sized entry and interior doors to suit your home remodel or new construction, and learn about the most reasonable DIY projects.

Q: We just bought a house that was built in the 1960s and is going to remodel it to update it. Our plans include adding some new doors and we are wondering which sizes will work best. Are there standard guidelines for doors?

A: Congratulations on your home purchase! Not all older homes have doors of a similar size because many homes were built before local building codes were established and the doors were often made by hand. Today, doors come in standard sizes and are stocked in DIY stores and home improvement centers. In addition to stocking the standard size for doors, many stores also have some alternate sizes available, which can be used in certain areas of the home.

There are standard door sizes and a few alternatives available. Interior doors come in standard heights, widths, and thicknesses, as follows:

The standard interior door height is 80 inches. This is the most common height for walk-through doors leading from room to room. An 80-inch door is called a 6/8 door (pronounced "six-eight") because it is 6 feet 8 inches tall.

In stock, you will also find a slightly shorter 78-inch door. Called door 6/6, it is reserved for cabinets and service doors. The standard width of the interior door is 32 inches. This is the minimum width required for a walk-through door. You can also find some narrower doors in stock, including 30-, 28-, and 24-inch. The code allows for these narrower widths such as cabinets and utility doors.

You can find 36-inch wide doors in stock. These broader options comply with the Americans with Disabilities Act (ADA) and are a popular choice for households whose residents have mobility issues.

The standard inside thickness is 1⅜ inches. This is the most common interior door thickness and sometimes the only thickness available at home improvement stores. Some stores can stock doors with alternate thicknesses of 1½ inches and 1¾ inches. These are slightly thicker than the standard ones and are often insulated or made from hardwood. The standard thickness of the inside door jamb on pre-installed doors is 4 to 9/16 inches. The door jamb is the frame that mounts to the wall and supports the door on the hinges. This thickness is designed for installation on a standard two-by-four wall (built with studs that are actually 1½ inches by 3½ inches).

An alternate jamb thickness is 6 to 9/16 inches. It is designed to fit two-by-six walls (built with posts that are actually 1⅕ inches by 5½ inches).

Front doors are typically 36 inches wide

While the width of a 36-inch door is too large for an interior door, it is the standard size for front doors. The standard height remains the same, however, at 80 inches. Most entry doors are also slightly thicker than interior doors, with a standard thickness of 1¾ inches. These slightly wider doors allow you to move large appliances and furniture around the house. Standard jamb thicknesses are similar to interior door jamb thicknesses, either 4 to 9/16 inches or 6 to 9/16 inches to accommodate two-by-four and two-by-six walls, respectively.