When it’s time to choose new doors for your home, you have plenty of decisions ahead of you. What type of door fits best in your entryways, closets and bedrooms? Will each door have an in-swing or out-swing? Will you choose pre-hung or slab doors?
You can simplify the process by knowing measurements for your new door in order to find a piece that fits the frame and rough opening. Before you begin, it’s helpful to know standard door width and regulations for interiors and exteriors.
Find out the standard door measurements for different types of entryways throughout your home. Whether you need to fit a bathroom, hallway, or garage entry door, you’ll get the industry standard and minimum required dimensions for common types of doors.
What are the standard door sizes for the interior of a house?
Standard door dimensions for interior rooms can vary depending on the type of space the door leads into. Common interior door sizes are between 80” and 96” tall, with a width between 2 and 3 feet. Standard door width measurements fall at 24”, 28”, 30”, 32” and 36”.
The average bedroom entryway has a width of either 2’8” or 3 feet. Depending on whether or not a living unit is coded accessible, some openings – like bedroom entryways – may need to be at least 36” wide.
Bathroom doors tend to be narrower than bedroom doors, with a standard width from 2’4” to 2’6”.
Closet doors have the most relaxed size regulations. In older houses, you may find closet doors only 18” wide. Today, the normal door size for a closet is 96” tall and 30” wide.
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Minimum interior door sizes
According to the IRC all interior doors must be a minimum of 80” high. A 36” door is ADA-compliant for the most comfortable passage by people with disabilities, with a minimum clear width of 32” when the door is open at a 90-degree angle.
There are some exceptions to this rule, such as doors that lead into a sleeping area or bedroom. These kinds of interior doors can be slightly shorter, requiring a minimum width of 28” and a minimum height of 78”.
Closet doors have no minimum width restrictions for spaces smaller than 10 square feet, but they must be at least 78” tall. Hallway and bathroom doors must be 80” tall and have no minimum width requirement.
What are the standard door sizes for the exterior of a house?
Front entrances have a standard door height of 80” and a width of 36” or 3 feet, which is also the minimum requirement for outside doors. Some newer homes include a taller front door, with a standard size of 96” or 8 feet tall. These wide, thick doors make it easier to move furniture in and out of a house.\
Back and garage entrance
Back-entry doors and garage-entry doors come in the same standard door size as front entryways: 80” high and 36” wide. All entries that lead to the outside of a home will be slightly thicker than interior doors. Instead of a 1-⅜” thickness, these doors are 1-¼”.
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Minimum exterior door sizes
Exterior doors in a residential building, such as a front entryway, garage door, back door or fire exit, must meet a minimum door height of 80” and a minimum width of 36”.
Each building or living unit requires at least one exit door. If a bedroom has an exit door but it’s not the only exit in the space, the IRC specifies that this bedroom exit door can be narrower than the minimum requirement, down to 32” wide. These bedroom exits must be at least 76” in height.
Exterior doors must have a clear width of 32” when the door is open at a 90-degree angle. They’re also required to have a landing that measures the width of the door and at least 36” deep leading away from the building.
It can be challenging to pin down an exact standard size for doors. Depending on what year a home was built and where it’s located, you may find all kinds of different widths, heights and thicknesses when it comes to interior and exterior doors. Furthermore, regional standards may differ and accessibility laws are relatively new compared to the age of some buildings in the US.
Luckily, there are a few standard measurements across the industry to help you guess which door sizes will be readily available. You can also rely on regulators like the IRC to provide the minimum requirements for door measurements in residential buildings. Whether you’re looking for custom French doors or a sliding glass entryway, knowing the standard door width before you begin your order will save you countless hours and money.
If you’re still wondering how to find essential measurements for your new door, check out the answers to these common questions when it comes to standard door width.
How thick is a standard door?
A standard-sized door is 1⅜ inches thick. This rule goes for most interior doors that fall under average measurements, between 78” to 80” height and 28” to 36” width.
Exterior doors, such as a front door, back door, or garage entry door, have a slightly bigger standard thickness of 1 ¾ inches. This thickness standard also applies to larger doors that are over 90” tall or 36” wide.
How big Is a doorway?
A doorway refers to the rough opening and framing that supports the door with hinges. Construction standards require a ¾ margin between the width of the frame and the width of the door, along with a ⅜ difference in the height. There is an additional margin between the width of the structure and the width of the rough opening around it.
If a door is a standard 36” width and 80” height, that means the frame will be 37 ½” wide and 81 ¾” tall. If you’re measuring the rough opening without the frame, you’ll need to add an additional 1½ to 1¼ inch to estimate the size of the door required. Essentially, you’re adding 1½ inch or 1¼ inch to the total dimensions. Most standard doorways are around an inch and a half larger than the door.
What is the price difference between a customizable door to a standard door?
The price of a door varies based on what kind of material you need. Glass, metal, and wood are popular options for both interior and exterior doors, with a range in cost.
You can cut costs by ordering doors in a standard size. If you live in an older or custom-built home, you may find that your door frames and rough openings come in an irregular size. In this case, you may need to order a custom door, which can increase the price.
A simple, standard wood door costs between $300-$400 in materials alone and having it made custom would add another $100-$200. After that, you’ll need to factor in installation pricing, which ends up costing more than the door itself.
Custom door pricing increases based on the material and type of door you need. A custom-built glass sliding door will cost more than a custom wood slab, and installation costs for this material and door style may go up as well.